title:
The Isoscalar Giant Dipole Resonance in 208Pb and the Nuclear
  incompressibility

abstract:
  The isoscalar giant dipole resonance (ISGDR) has been investigated in 208Pb
using inelastic scattering of 400 MeV alpha particles at forward angles,
including 0deg. Using the superior capabilities of the Grand Raiden
spectrometer, it has been possible to obtain spectra devoid of any
"instrumental" background. The ISGDR strength distribution has been extracted
from a multipole-composition of the observed spectra. The implication of these
results on the experimental value of nuclear incompressibility are discussed.


title: Flavor Asymmetry of Light Quarks in the Nucleon Sea

abstract:
  A surprisingly large asymmetry between the up and down sea quark
distributions in the nucleon has been observed in recent deep inelastic
scattering and Drell-Yan experiments. This result strongly suggests that the
mesonic degrees of freedom play an important role in the description of the
parton distributions of the hadronic sea. In this article, we review the
current status of our knowledge of the flavor structure of the nucleon sea. The
implications of various theoretical models as well as possible future
measurements are also discussed.


title: The 16N Calibration Source for the Sudbury Neutrino Observatory

abstract:
  A calibration source using gamma-rays from 16N (t_1/2 = 7.13 s) beta-decay
has been developed for the Sudbury Neutrino Observatory (SNO) for the purpose
of energy and other calibrations. The 16N is produced via the (n,p) reaction on
16O in the form of CO2 gas using 14-MeV neutrons from a commercially available
Deuterium-Tritium (DT) generator. The 16N is produced in a shielding pit in a
utility room near the SNO cavity and transferred to the water volumes (D2O or
H2O) in a CO2 gas stream via small diameter capillary tubing. The bulk of the
activity decays in a decay/trigger chamber designed to block the energetic
beta-particles yet permit the primary branch 6.13 MeV gamma-rays to exit.
Detection of the coincident beta-particles with plastic scintillator lining the
walls of the decay chamber volume provides a tag for the SNO electronics. This
paper gives details of the production, transfer, and triggering systems for
this source along with a discussion of the source gamma-ray output and
performance.


title:
Nonmesonic decay of the Lambda hyperon in nuclear matter - implications
  on the weak Lambda-N interaction

abstract:
  The lifetime of the Lambda hyperon in heavy hypernuclei as measured by the
COSY-13 Collaboration in proton - Au, Bi and U collisions has been analysed to
yield tau(Lambda) = (145 +- 11) ps. This value for tau(Lambda) is compatible
with the lifetime extracted from antiproton annihilation on Bi and U targets,
however, much more accurate. We find that the dependence of the lifetime
tau(Lambda) on the mass of hypernuclei indicates a violation of the
phenomenological Delta I = 1/2 rule known from the weak mesonic decays of
strange particles. PACS: {13.30.-a}{Decays of baryons}
{13.75.Ev}{Hyperon-nucleon interaction} {21.80}{Hypernuclei}
{25.80.Pw}{Hyperon-induced reactions}


title: Compton Scattering by the Proton using a Large-Acceptance Arrangement

abstract:
  Compton scattering by the proton has been measured using the tagged-photon
facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The new
data are interpreted in terms of dispersion theory based on the SAID-SM99K
parameterization of photo-meson amplitudes. It is found that two-pion exchange
in the t-channel is needed for a description of the data in the second
resonance region. The data are well represented if this channel is modeled by a
single pole with mass parameter m(sigma)=600 MeV. The asymptotic part of the
spin dependent amplitude is found to be well represented by pi-0-exchange in
the t-channel. A backward spin-polarizability of
gamma(pi)=(-37.1+-0.6(stat+syst)+-3.0(model))x10^{-4}fm^4 has been determined
from data of the first resonance region below 455 MeV. This value is in a good
agreement with predictions of dispersion relations and chiral pertubation
theory. From a subset of data between 280 and 360 MeV the resonance
pion-photoproduction amplitudes were evaluated leading to a E2/M1 multipole
ratio of the p-to-Delta radiative transition of EMR(340
MeV)=(-1.7+-0.4(stat+syst)+-0.2(model))%. It was found that this number is
dependent on the parameterization of photo-meson amplitudes. With the MAID2K
parameterization an E2/M1 multipole ratio of EMR(340
MeV)=(-2.0+-0.4(stat+syst)+-0.2(model))% is obtained.


title:
Solid State Systems for Electron Electric Dipole Moment and other
  Fundamental Measurements

abstract:
  In 1968, F.L. Shapiro published the suggestion that one could search for an
electron EDM by applying a strong electric field to a substance that has an
unpaired electron spin; at low temperature, the EDM interaction would lead to a
net sample magnetization that can be detected with a SQUID magnetometer. One
experimental EDM search based on this technique was published, and for a number
of reasons including high sample conductivity, high operating temperature, and
limited SQUID technology, the result was not particularly sensitive compared to
other experiments in the late 1970's.
  Advances in SQUID and conventional magnetometery had led us to reconsider
this type of experiment, which can be extended to searches and tests other than
EDMs (e.g., test of Lorentz invariance). In addition, the complementary
measurement of an EDM-induced sample electric polarization due to application
of a magnetic field to a paramagnetic sample might be effective using modern
ultrasensitive charge measurement techniques. A possible paramagnetic material
is Gd-substituted YIG which has very low conductivity and a net enhancement
(atomic enhancement times crystal screening) of order unity. Use of a
reasonable volume (100's of cc) sample of this material at 50 mK and 10 kV/cm
might yield an electron EDM sensitivity of $10^{-33}$ e cm or better, a factor
of $10^6$ improvement over current experimental limits.


title:
Spin-Momentum Correlations in Quasi-Elastic Electron Scattering from
  Deuterium

abstract:
  We report on a measurement of spin-momentum correlations in quasi-elastic
scattering of longitudinally polarized electrons with an energy of 720 MeV from
vector-polarized deuterium. The spin correlation parameter $A^V_{ed}$ was
measured for the $^2 \vec{\rm H}(\vec e,e^\prime p)n$ reaction for missing
momenta up to 350 MeV/$c$ at a four-momentum transfer squared of 0.21
(GeV/c)$^2$. The data give detailed information about the spin structure of the
deuteron, and are in good agreement with the predictions of microscopic
calculations based on realistic nucleon-nucleon potentials and including
various spin-dependent reaction mechanism effects. The experiment demonstrates
in a most direct manner the effects of the D-state in the deuteron ground-state
wave function and shows the importance of isobar configurations for this
reaction.


title: First results from RHIC: What are they telling us?

abstract:
  The Relativistic Heavy Ion Collider (RHIC) facility at Brookhaven National
Laboratory is the first accelerator specifically constructed for the study of
very hot and dense nuclear matter. At sufficiently high temperature, nuclear
matter is expected to undergo a phase transition to a quark-gluon plasma. It is
the specific goal of the field to study the nature of this plasma and
understand the phase transitions between different states. The RHIC accelerator
along with four experiments BRAHMS, PHENIX, PHOBOS, and STAR were commissioned
last year with first collisions occurring in June 2000. Presented here are the
first results from low luminosity beam in Run I. They are a glimpse of the
wealth of physics to be extracted from the RHIC program over the next several
years.


title:
New Results on Pb-Au Collisions at 40 AGeV from the CERES/NA45
  Experiment

abstract:
  In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40
GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a
trigger selection corresponding to approximately the most central 30% of the
geometrical cross section. Results on low-mass electron pair analysis are
presented.
  The upgrade of the experimental setup with the radial drift TPC has allowed
to enhance hadron physics capabilities of the experiment. New results on hadron
spectra (including Lambda) and flow are presented.


title:
Measurement of Mutual Coulomb Dissociation in $\sqrt{s_{NN}}=130$ GeV
  Au+Au collisions at RHIC

abstract:
  We report on the first measurement of Mutual Coulomb Dissociation in heavy
ion collisions. We employ forward calorimeters to measure neutron multiplicity
at beam rapidity in peripheral collisions. The cross-section for simultaneous
electromagnetic breakup of Au nuclei at $\sqrt{s_{NN}}=130$ GeV is
$\sigma_{MCD}=3.67\pm 0.25$ barns in good agreement with calculations.


title:
Fragment size correlations in finite systems - application to nuclear
  multifragmentation

abstract:
  We present a new method for the calculation of fragment size correlations in
a discrete finite system in which correlations explicitly due to the finite
extent of the system are suppressed. To this end, we introduce a combinatorial
model, which describes the fragmentation of a finite system as a sequence of
independent random emissions of fragments. The sequence is accepted when the
sum of the sizes is equal to the total size. The parameters of the model, which
may be used to calculate all partition probabilities, are the intrinsic
probabilities associated with the fragments. Any fragment size correlation
function can be built by calculating the ratio between the partition
probabilities in the data sample (resulting from an experiment or from a Monte
Carlo simulation) and the 'independent emission' model partition probabilities.
This technique is applied to charge correlations introduced by Moretto and
collaborators. It is shown that the percolation and the nuclear statistical
multifragmentaion model ({\sc smm}) are almost independent emission models
whereas the nuclear spinodal decomposition model ({\sc bob}) shows strong
correlations corresponding to the break-up of the hot dilute nucleus into
nearly equal size fragments.


title: Measurements of ultracold neutron lifetimes in solid deuterium

abstract:
  We present the first measurements of the survival time of ultracold neutrons
(UCNs) in solid deuterium SD2. This critical parameter provides a fundamental
limitation to the effectiveness of superthermal UCN sources that utilize solid
ortho-deuterium as the source material. Superthermal UCN sources offer orders
of magnitude improvement in the available densities of UCNs, and are of great
importance to fundamental particle-physics experiments such as searches for a
static electric dipole moment and lifetime measurements of the free neutron.
These measurements are performed utilizing a SD2 source coupled to a spallation
source of neutrons, providing a demonstration of UCN production in this
geometry and permitting systematic studies of the influence of thermal
up-scatter and contamination with para-deuterium on the UCN survival time.


title:
Feasibility study of the quasi-free creation of the eta-prime meson in
  the reaction pn --> pn eta-prime

abstract:
  The feasibility of an investigation of the pn --> pn eta-prime reaction by
means of the COSY-11 internal target facility is discussed. Appraisals are
based on the assumption of the quasi-free reactions of beam protons,
circulating in the cooler synchrotron COSY, with neutrons from a windowless
deuteron cluster target.


title:
Measurement of Single and Double Spin-Flip Probabilities in Inelastic
  Deuteron Scattering on 12C at 270 MeV

abstract:
  The deuteron single and double spin-flip probabilities, S1 and S2, have been
measured for the 12C(pol{d},pol{d}') reaction at Ed = 270 MeV for an excitation
energy range between 4 and 24 MeV and a scattering angular range between
Theta_lab = 2.5 and 7.5 deg. The extracted S1 exhibits characteristic values
depending on the structure of the excited state. The S2 is close to zero over
the measured excitation energy range. The SFP angular distribution data for the
2+ (4.44 MeV) and 1+ (12.71 MeV) states are well described by the microscopic
DWIA calculations.


title:
Nuclear Recoil Measurement in CsI(Tl) Crystal for Cold Dark Matter
  Detection

abstract:
  There are recent interests with CsI(Tl) scintillating crystals for Dark
Matter experiments. The scattering signatures by neutrons on a CsI(Tl) detector
were studied using a neutron beam generated by a 13 MV Tandem accelerator. The
energy spectra of nuclear recoils from 7 keV to 132 keV were measured, and
their quenching factors for scintillating light yield were derived. The data
represents the first confirmation of the Optical Model predictions on neutron
elastic scatterings with a direct measurement on the nuclear recoils of heavy
nuclei. The pulse shape discrimination techniques to differentiate nuclear
recoils from $\gamma$-background were studied. Internal consistencies were
obtained among the different methods of light yield measurements. The projected
capabilities for Cold Dark Matter searches with CsI(Tl) crystals are presented.


title: Caloric curve of 8 GeV/c negative pion and antiproton + Au reactions

abstract:
  The relationship between nuclear temperature and excitation energy of hot
nuclei formed by 8 GeV/c negative pion and antiproton beams incident on 197Au
has been investigated with the ISiS 4-pidetector array at the BNL AGS
accelerator. The double-isotope-ratio technique was used to calculate the
temperature of the hot system. The two thermometers used (p/d-3He/4He) and
(d/t-3He/4He) are in agreement below E*/A ~ 7 MeV when corrected for secondary
decay. Comparison of these caloric curves to those from other experiments shows
some differences that may be attributable to instrumentation and analysis
procedures. The caloric curves from this experiment are also compared with the
predictions from the SMM multifragmentation model.


title: Neutrino Observations from the Sudbury Neutrino Observatory

abstract:
  The Sudbury Neutrino Observatory (SNO) is a water imaging Cherenkov detector.
Its usage of 1000 metric tons of D$_{2}$O as target allows the SNO detector to
make a solar-model independent test of the neutrino oscillation hypothesis by
simultaneously measuring the solar $\nu_{e}$ flux and the total flux of all
active neutrino species. Solar neutrinos from the decay of $^{8}$B have been
detected at SNO by the charged-current (CC) interaction on the deuteron and by
the elastic scattering (ES) of electrons. While the CC reaction is sensitive
exclusively to $\nu_{e}$, the ES reaction also has a small sensitivity to
$\nu_{\mu}$ and $\nu_{\tau}$. In this paper, recent solar neutrino results from
the SNO experiment are presented. It is demonstrated that the solar flux from
$^{8}$B decay as measured from the ES reaction rate under the no-oscillation
assumption is consistent with the high precision ES measurement by the
Super-Kamiokande experiment. The $\nu_{e}$ flux deduced from the CC reaction
rate in SNO differs from the Super-Kamiokande ES results by 3.3$sigma$. This is
evidence for an active neutrino component, in additional to $\nu_{e}$, in the
solar neutrino flux. These results also allow the first experimental
determination of the total active $^{8}$B neutrino flux from the Sun, and is
found to be in good agreement with solar model predictions.


title: Termination of the 12C(12C,12C[3-])12C[3-] band of resonances

abstract:
  New experimental data for the 12C+12C reaction have been measured in the
centre-of-mass energy range E_{c.m.}= 40 to 60 MeV. Excitation functions for a
number of single and mutual $^{12}$C inelastic channels have been measured
which include the 0_{gs}, 2_{1}^+, 0_{2}^+, 3_{1}^-, and 4$_1^+$ 12C states.
All of the reactions display largely unstructured excitation functions over
this energy range. The absence of further resonances in this energy region for
the 12C(12C,2C[3_1^-])12C[3_1^-$] reaction confirms theoretical predictions of
the termination of the band of resonances found at lower centre-of-mass
energies in this channel.


title: 13LambdaC Hypernucleus Studied with the 13C(K-, pi- gamma) Reaction

abstract:
  The 13LambdaC hypernucleus was studied by measuring gamma rays in coincidence
with the 13C(K-, pi-) reaction. gamma rays from the 1/2- and 3/2- states, which
are the partners of the spin-orbit doublet states with a predominant
configuration of [12C_g.s.(0+) x p_Lambda], to the ground state were measured.
The splitting of the states was found to be DeltaE(1/2- - 3/2-) =
+152+-54(stat)+-36(syst) keV. This value is 20-30 times smaller than that of
single particle states in nuclei around this mass region. The
j_Lambda=l_Lambda-1/2 ((p_1/2)_Lambda) state appeared higher in energy, as in
normal nuclei. The value gives new insight into the YN interaction. The
excitation energies of the 1/2- and 3/2- states were obtained as
10.982+-0.031(stat)+-0.056(syst) MeV and 10.830+-0.031(stat)+-0.056(syst) MeV,
respectively. We also observed gamma rays from the 3/2+ state, which has a
[12C(2+) x s_Lambda] configuration, to the ground state in 13LambdaC. The
excitation energy of the 3/2+ state was obtained as
4.880+-0.010(stat)+-0.017(syst) MeV. Nuclear gamma rays with energies of 4.438
and 15.100 MeV had similar yields, which suggests that a quasi-free knockout of
a Lambda particle is dominant in highly excited regions.


title:
Precision Measurement of the Spin-dependent Asymmetry in the Threshold
  Region of $^3\vec{\mathrm{He}}(\vec{e},e')$

abstract:
  We present the first precision measurement of the spin-dependent asymmetry in
the threshold region of $^3\vec{\rm He}(\vec{e},e')$ at $Q^2$-values of 0.1 and
0.2 (GeV/c)$^2$. The agreement between the data and non-relativistic Faddeev
calculations which include both final-state interactions (FSI) and
meson-exchange currents (MEC) effects is very good at $Q^2$ = 0.1 (GeV/c)$^2$,
while a small discrepancy at $Q^2$ = 0.2 (GeV/c)$^2$ is observed.


title: Measurement of inclusive antiprotons from Au+Au collisions at 130 GeV

abstract:
  We report the first measurement of inclusive antiproton production at
mid-rapidity in Au+Au collisions at 130 GeV by the STAR experiment at RHIC. The
antiproton transverse mass distributions in the measured transverse momentum
range of 0.25 < pT < 0.95 GeV/c are found to fall less steeply for more central
collisions. The extrapolated antiproton rapidity density is found to scale
approximately with the negative hadron multiplicity density.


title:
Refractive elastic scattering of carbon and oxygen nuclei: The mean
  field analysis and Airy structures

abstract:
  The experimental data on the $^{16}$O$+^{12}$C and $^{18}$O$+^{12}$C elastic
scatterings and their optical model analysis are presented. Detailed and
complete elastic angular distributions have been measured at the Strasbourg
Vivitron accelerator at several energies covering the energy range between 5
and 10 MeV per nucleon. The elastic scattering angular distributions show the
usual diffraction pattern and also, at larger angles, refractive effects in the
form of nuclear rainbow and associated Airy structures. The optical model
analysis unambiguously shows the evolution of the refractive scattering
pattern. The observed structure, namely the Airy minima, can be consistently
described by a nucleus-nucleus potential with a deep real part and a weakly
absorptive imaginary part. The difference in absorption in the two systems is
explained by an increased imaginary (mostly surface) part of the potential in
the $^{18}$O$+^{12}$C system. The relation between the obtained potentials and
those reported for the symmetrical $^{16}$O$+^{16}$O and $^{12}$C$+^{12}$C
systems is drawn.


title:
Cascade Gamma-Decay of the 193Os Compound Nucleus and some Aspects of
  Dynamics of Change in Nuclear Properties below Bn

abstract:
  Two-step cascades from the 192Os(n th,gamma)193Os reaction were studied in
gamma-gamma coincidence measurement. The decay scheme of 193Os was established
up to the excitation energy ~3 MeV. The excitation spectrum of intermediate
levels of most intense cascades was found to be practically harmonic.


title: Quark Gluon Plasma - Recent Advances

abstract:
  While heavy ion collisions at the SPS have produced excited strongly
interacting matter near the conditions for quark deconfinement, the RHIC may be
the first machine capable of creating quark-antiquark plasmas sufficiently
long-lived to allow deep penetration into the new phase. A comprehensive
experimental program addressing this exciting physics has been put into place.
Presented here are preliminary results from Au+Au at $\sqrt{S}$ = 130 GeV
obtained during the first RHIC run and some CERN SPS results from Pb+Pb at
$\sqrt{S}$ = 17 GeV (particularly relevant to QGP search).


title: Anisotropic Flow at the SPS and RHIC

abstract:
  The results on directed and elliptic flow for Pb + Pb at the full energy of
the SPS (158 GeV/A) and from the first year of Au + Au at RHIC
(sqrt{s_{_{NN}}=130 GeV) are reviewed. The different experiments agree well and
a consistent picture has emerged indicating early time thermalization at RHIC.


title:
Low-energy p-d Scattering: High Precision Data, Comparisons with Theory,
  and Phase-Shift Analyses

abstract:
  Angular distributions of sigma(theta), A_y, iT_11, T_20, T_21, and T_22 have
been measured for d-p scattering at E_c.m.=667 keV. This set of high-precision
data is compared to variational calculations with the nucleon-nucleon potential
alone and also to calculations including a three-nucleon (3N) potential.
Agreement with cross-section and tensor analyzing power data is excellent when
a 3N potential is used. However, a comparison between the vector analyzing
powers reveals differences of approximately 40% in the maxima of the angular
distributions which is larger than reported at higher energies for both p-d and
n-d scattering. Single-energy phase-shift analyses were performed on this data
set and a similar data set at E_c.m.=431.3 keV. The role of the different
phase-shift parameters in fitting these data is discussed.


title: Heavy Residue Formation in 20 MeV/nucleon 197Au + 90Zr collisions

abstract:
  The yields and velocity distributions of heavy residues and fission fragments
from the reaction of 20 MeV/nucleon 197Au + 90Zr have been measured using the
MSU A1200 fragment separator. A bimodal distribution of residues is observed,
with one group, resulting from peripheral collisions, having fragment mass
numbers A=160-200, while the other group, resulting from ``hard'' collisions,
has A=120-160. This latter group of residues can be distinguished from fission
fragments by their lower velocities. A model combining deep-inelastic transfer
and incomplete fusion for the primary interaction stage and a statistical
evaporation code for the deexcitation stage has been used to describe the
properties of the product distributions.


title: Flow analysis from cumulants: a practical guide

abstract:
  We have recently proposed a new method of flow analysis, based on a cumulant
expansion of multiparticle azimuthal correlations. Here, we describe the
practical implementation of the method. The major improvement over traditional
methods is that the cumulant expansion eliminates order by order correlations
not due to flow, which are often large but usually neglected.


title:
New Technique for a Simultaneous Estimation of the Level Density and
  Radiative Strength Functions of Dipole Transitions at Eex < Bn-0.5 MeV

abstract:
  The new, model-independent method to estimate simultaneously the level
densities excited in the (n,gamma) reaction and the radiative strength
functions of dipole transitions is developed. The method can be applied for any
nucleus and reaction followed by cascade gamma-emission. It is just necessary
to measure the intensities of two-step gamma-cascades depopulating one or
several high-excited states and determine the quanta ordering in the main
portion of the observed cascades. The method provides a sufficiently narrow
interval of most probable densities of levels with given J,pi and radiative
strength functions of dipole transitions populating them.


title: Study of the eta-proton interaction via the reaction p p --> p p eta

abstract:
  A measurement of the pp --> p p eta reaction at the excess energy of Q = 15.5
+- 0.4 MeV has been carried out at the internal beam facility COSY-11 with an
integrated luminosity of 811 nb^-1 The number of ~24000 identified events
permits a precise determination of total (2.32 +- 0.05 +- 0.35 \mu b) and
differential cross sections. Preliminary investigations show that the angular
distribution of the eta meson in the center-of-mass system is isotropic. A
qualitative analysis of the Dalitz-plot distribution is presented.


title: The detection of neutron clusters

abstract:
  A new approach to the production and detection of bound neutron clusters is
presented. The technique is based on the breakup of beams of very neutron-rich
nuclei and the subsequent detection of the recoiling proton in a liquid
scintillator. The method has been tested in the breakup of 11Li, 14Be and 15B
beams by a C target. Some 6 events were observed that exhibit the
characteristics of a multineutron cluster liberated in the breakup of 14Be,
most probably in the channel 10Be+4n. The various backgrounds that may mimic
such a signal are discussed in detail.


title:
Development of the Simulator for the Global Orbit Feedback System Using
  EPICS

abstract:
  We have carried out the basic research for the accelerator and tokamak
control system based on the Experimental Physics and Industrial Control System
(EPICS). We have used the process database and the state notation language
(SNL) in the EPICS to develop the simulator which represents as a virtual
machine. In this paper, we introduce the simulator of the global orbit feedback
system as an example. This simulates the global orbit feedback system under the
constraint conditions for Pohang Light Source (PLS) storage ring. We describe
the details of the feedback algorithm and the realization of the simulator.


title: A slow control system for the Garfield apparatus

abstract:
  The major part of the GARFIELD apparatus electronics are monitored and set up
through a slow control system, which has been developed at LNL. A software
package based on Lab View has been dedicated to the setting and control of 16
channels integrated Amplifiers and Constant Fraction Discriminators. GPIB
controllers and GPIB-ENET interfaces have been used for the communication
between the Personal Computer and the front-end of the electronics.


title:
Charged Hadron Spectra in Au+Au Collisions at a Centre-of-Mass Energy of
  130 GeV

abstract:
  This work concentrates on measurement of global hadronic observables in Au+Au
interactions at a centre-of-mass energy per nucleon pair of 130 GeV, which
mainly address conditions in the final state of the collision. The minimum bias
multiplicity distribution, the transverse momentum (pT), and pseudorapidity
(eta) distributions for charged hadrons (h-, h+) are presented. Results on
identified pi- transverse mass (mT) and rapidity (y) distributions are also
discussed. The data were taken with the STAR detector at BNL-RHIC with emphasis
on particles near mid-rapidity. We find that the h- multiplicity at
mid-rapidity for the 5% most central interactions is dN/d eta = 280 +/- 1 +/-
20, an increase per participant of 38% relative to p-pbar collisions at similar
energy. The mean transverse momentum is 0.508 +/- 0.012 GeV/c and is larger
than in Pb+Pb collisions at lower energies. The scaling of the h- yield per
participant nucleon pair, obtained via a ratio of Au+Au to p-pbar pT
distributions, is a strong function of pT. The pseudorapidity distribution is
almost constant within |eta|<1. The pi- rapidity distribution is also flat
around mid-rapidity in the region y<0.8, with a yield of pions for central
collisions of dN/dy = 287 +/- 1 +/- 21. However, the slope of the mT
distributions is not the same for different rapidity bins, suggesting that
boost-invariance is not fully achieved in the collisions.


title: Collective Flow vs. Hard Processes in Relativistic Heavy Ion Collisions

abstract:
  In relativistic heavy ion collisions, the $p_T$ distributions of hadrons
reflect the transverse motion generated during the collision and therefore the
collision dynamics. The moderate $p_T$ values measured to date at $\sqrt{s}
\approx $ 20 GeV/nucleon contain a mix of hard and soft processes. The
available data from the SPS on $\pi$, K, p, and $\Lambda$ are used to constrain
the magnitude of collective radial expansion. In $A+A$ collisions, the
hydrodynamic distributions determined from the measured collective expansion
are determined up to high $p_T$ and are consistent with the $\pi^{0}$ data. To
cleanly observe hard processes, measurements at $p_T \ge 4$ GeV/c will be
required. Pions produced in $p+W$ collisions clearly deviate from hydrodynamic
distributions at $p_T > 2$ GeV/c, underscoring the differences in the physics
between $p+A$ and $A+A$ collisions.


title: Longitudinal Flow of Protons from 2-8 AGeV Central Au+Au Collisions

abstract:
  Rapidity distributions of protons from central $^{197}$Au + $^{197}$Au
collisions measured by the E895 Collaboration in the energy range from 2 to 8
AGeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived
using a thermal model including collective longitudinal expansion are extracted
from these distributions. The results show an approximately linear increase in
the longitudinal flow velocity, $<\beta\gamma>_{L}$, as a function of the
logarithm of beam energy.


title: Measurements of sideward flow around the balance energy

abstract:
  Sideward flow values have been determined with the INDRA multidetector for
Ar+Ni, Ni+Ni and Xe+Sn systems studied at GANIL in the 30 to 100 A.MeV incident
energy range. The balance energies found for Ar+Ni and Ni+Ni systems are in
agreement with previous experimental results and theoretical calculations.
Negative sideward flow values have been measured. The possible origins of such
negative values are discussed. They could result from a more important
contribution of evaporated particles with respect to the contribution of
promptly emitted particles at mid-rapidity. But effects induced by the methods
used to reconstruct the reaction plane cannot be totally excluded. Complete
tests of these methods are presented and the origins of the
``auto-correlation'' effect have been traced back. For heavy fragments, the
observed negative flow values seem to be mainly due to the reaction plane
reconstruction methods. For light charged particles, these negative values
could result from the dynamics of the collisions and from the reaction plane
reconstruction methods as well. These effects have to be taken into account
when comparisons with theoretical calculations are done.


title: Thermal Bremsstrahlung photons probing the nuclear caloric curve

abstract:
  Hard-photon (E$_{\gamma}>$ 30 MeV) emission from second-chance
nucleon-nucleon Bremsstrahlung collisions in intermediate energy heavy-ion
reactions is studied employing a realistic thermal model. Photon spectra and
yields measured in several nucleus-nucleus reactions are consistent with an
emission from hot nuclear systems with temperatures $T\approx$ 4 - 7 MeV. The
corresponding caloric curve in the region of excitation energies
$\epsilon^\star\approx$ 3{\it A} - 8{\it A} MeV shows lower values of $T$ than
those expected for a Fermi fluid.


title: Low-Mass Lepton Pair Production in Pb-Au Collisions at 40 AGeV

abstract:
  The CERES/NA45 experiment at the CERN SPS has previously measured
$e^{+}e^{-}$ pair production in 160 AGeV Pb-Au collisions. In the mass region
m>0.2 GeV/c$^{2}$, an enhancement of $2.7\pm0.4(statist.)\pm0.5(syst.)$
compared to the expectation from known hadronic decay sources was observed. In
the 40 AGeV data taken in 1999, an enhancement is again found; a preliminary
analysis gives the even larger value of $4.5\pm1.2(statist.)$. The results are
compared to theoretical model calculations based on $\pi^{+}\pi^{-}$
annihilation with a modified $\rho$-propagator.


title: Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2

abstract:
  The ratio of the electric and magnetic form factors of the proton, GEp/GMp,
was measured at the Thomas Jefferson National Accelerator Facility (JLab) using
the recoil polarization technique. The ratio of the form factors is directly
proportional to the ratio of the transverse to longitudinal components of the
polarization of the recoil proton in the elastic $\vec ep \to e\vec p$
reaction. The new data presented in this article span the range 3.5 < Q2 < 5.6
GeV2 and are well described by a linear Q2 fit. Also, the ratio QF2p/F1p
reaches a constant value above Q2=2 GeV2.


title: Experimental Conference Summary

abstract:
  Experimental summary talk given at International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions (QM2001), Stony Brook, New York,
15-20 Jan 2001.


title: Level densities and $\gamma$-strength functions in $^{148,149}$Sm

abstract:
  The level densities and $\gamma$-strength functions of the weakly deformed
$^{148}$Sm and $^{149}$Sm nuclei have been extracted. The temperature versus
excitation energy curve, derived within the framework of the micro canonical
ensemble, shows structures, which we associate with the break up of Cooper
pairs. The nuclear heat capacity is deduced within the framework of both the
micro canonical and the canonical ensemble. We observe negative heat capacity
in the micro canonical ensemble whereas the canonical heat capacity exhibits an
S-shape as function of temperature, both signals of a phase transition. The
structures in the $\gamma$-strength functions are discussed in terms of the
pygmy resonance and the scissors mode built on exited states. The samarium
results are compared with data for the well deformed $^{161,162}$Dy,
$^{166,167}$Er and $^{171,172}$Yb isotopes and with data from
(n,$\gamma$)-experiments and giant dipole resonance studies.


title:
Two-particle correlations in Au+Au collisions at $\sqrt{s_{NN}} = 130$
  GeV

abstract:
  We present preliminary results on two new two-particle correlation analyses
of Au+Au collisions at $\sqrt{s_{NN}} = 130 GeV$ performed by the STAR
collaboration. Two-pion interferometry with respect to the reaction plane shows
that the pion source can be described as an ellipse extended out of the
reaction plane. Analysing the pion-kaon correlation functions, we show that, on
average, pions and kaons are not emitted at the same position and/or time. Both
measurements are interpreted in the so-called blast wave model framework whose
main feature is a strong flow.


title:
7Be(p,gamma)8B astrophysical S-factor from precision cross section
  measurements

abstract:
  We measured the 7Be(p,gamma)8B cross section from E_cm = 186 to 1200 keV,
with a statistical-plus-systematic precision per point of better than +- 5%.
All important systematic errors were measured including 8B backscattering
losses. We obtain S_17(0) = 22.3 +- 0.7(expt) +- 0.5(theor) eV-b from our data
at E_cm <= 300 keV and the theory of Descouvemont and Baye.


title: The quasielastic 2H(e,e'p)n reaction at high recoil momenta

abstract:
  The 2H(e,e'p)n cross section was measured in Hall A of the Thomas Jefferson
National Accelerator Facility (JLab) in quasielastic kinematics (x=0.96) at a
four-momentum transfer squared, Q^2=0.67 (GeV/c)^2. The experiment was
performed in fixed electron kinematics for recoil momenta from zero to 550
MeV/c. Though the measured cross section deviates by 1-2 sigma from a
state-of-the-art calculation at low recoil momenta, it agrees at high recoil
momenta where final state interactions (FSI) are predicted to be large.


title: The Finuda Experiment: Status and Perspectives

abstract:
  FINUDA is a hypernuclear physics experiment that will be carried out at
DA$\Phi$NE, the $e^+e^-$ $\phi$-factory currently in operation at the INFN
Frascati Laboratory. The apparatus, which is assembled in the DA$\Phi$NE hall,
consists of a magnetic spectrometer with high resolution tracking capabilities.
In this paper the status of the experiment is presented, together with the main
features of the apparatus and of its physics program.


title: Strangeness Production in Star at Rhic

abstract:
  Strangeness study is one of the major goal of the STAR experiment at RHIC.
Results presented here have been obtained from analyses restricted to the
mid-rapidity region of Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV. An onset
of the understanding of the quark matter behavior produced at this relativistic
energy can be stressed from the investigation of the relative and absolute
yields of strange particle production, their transverse mass distributions and
from comparisons with previous results obtained by AGS and SPS experiments.


title:
Measurement of parity-nonconserving rotation of neutron spin in the
  0.734-eV p-wave resonance of $^{139}La$

abstract:
  The parity nonconserving spin rotation of neutrons in the 0.734-eV p-wave
resonance of $^{139}La$ was measured with the neutron transmission method. Two
optically polarized $^3He$ cells were used before and behind a a 5-cm long
$^{139}La$ target as a polarizer and an analyzer of neutron spin. The rotation
angle was carefully measured by flipping the direction of $^3He$ polarization
in the polarizer in sequence. The peak-to-peak value of the spin rotation was
found to be $ (7.4 \pm 1.1) \times 10^{-3} $ rad/cm which was consistent with
the previous experiments. But the result was statisticallly improved. The s-p
mixing model gives the weak matrix element as $xW = (1.71 \pm 0.25)$ meV. The
value agrees well with the one deduced from the parity-nonconserving
longitudinal asymmetry in the same resonance.


title:
Resonant Scattering of Muonic Hydrogen Atoms and Dynamics of Muonic
  Molecular Complex

abstract:
  Resonant scattering of muonic hydrogen atoms via back decay of molecular
complex, a key process in the understanding of epithermal muonic molecular
formation, is analyzed. The limitations of the effective rate approximation are
discussed and the importance of the explicit treatment of the back decay is
stressed. An expression of the energy distribution for the back-decayed atoms
is given.


title: Discovery of eta-mesic nuclei

abstract:
  First experimental results from a photoreaction which confirm an existence of
eta-mesic nuclei are discussed. The experiment was performed at the 1 GeV
electron synchrotron of LPI. Two values of the end-point energy of the
bremsstrahlung beam were used, 650 and 850 MeV (below and above
eta-photoproduction threshold on the nucleon). Correlated pi+ n pairs flying
from the 12C target were detected by two TOF scintillator spectrometers placed
in opposite directions and transversely to the gamma beam. Measured energy
spectra provide a strong evidence for a creation of eta-mesic nuclei as
intermediate states of the reaction studied.


title: Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions

abstract:
  Photon energy spectra up to the kinematic limit have been measured in 190 MeV
proton reactions with light and heavy nuclei to investigate the influence of
the multiple-scattering process on the photon production. Relative to the
predictions of models based on a quasi-free production mechanism a strong
suppression of bremsstrahlung is observed in the low-energy region of the
photon spectrum. We attribute this effect to the interference of photon
amplitudes due to multiple scattering of nucleons in the nuclear medium.


title:
Pseudorapidity distributions of charged particles from Au+Au collisions
  at the maximum RHIC energy, Sqrt(s_NN) = 200 GeV

abstract:
  We present charged particle densities as a function of pseudorapidity and
collision centrality for the 197Au+197Au reaction at Sqrt{s_NN}=200 GeV. For
the 5% most central events we obtain dN_ch/deta(eta=0) = 625 +/- 55 and
N_ch(-4.7<= eta <= 4.7) = 4630+-370, i.e. 14% and 21% increases, respectively,
relative to Sqrt{s_NN}=130 GeV collisions. Charged-particle production per pair
of participant nucleons is found to increase from peripheral to central
collisions around mid-rapidity. These results constrain current models of
particle production at the highest RHIC energy.


title:
Differential Elliptic Flow in 2 - 6 AGeV Au+Au Collisions: A New
  Constraint for the Nuclear Equation of State

abstract:
  Proton elliptic flow is studied as a function of impact-parameter $b$, for
two transverse momentum cuts in 2 - 6 AGeV Au + Au collisions. The elliptic
flow shows an essentially linear dependence on b (for $1.5 < b < 8$ fm) with a
negative slope at 2 AGeV, a positive slope at 6 AGeV and a near zero slope at 4
AGeV. These dependencies serve as an important constraint for discriminating
between various equations of state (EOS) for high density nuclear matter, and
they provide important insights on the interplay between collision geometry and
the expansion dynamics. Extensive comparisons of the measured and calculated
differential flows provide further evidence for a softening of the EOS between
2 and 6 GeV/nucleon.


title:
Spallation Neutron Production by 0.8, 1.2 and 1.6 GeV Protons on various
  Targets

abstract:
  Spallation neutron production in proton induced reactions on Al, Fe, Zr, W,
Pb and Th targets at 1.2 GeV and on Fe and Pb at 0.8, and 1.6 GeV measured at
the SATURNE accelerator in Saclay is reported. The experimental
double-differential cross-sections are compared with calculations performed
with different intra-nuclear cascade models implemented in high energy
transport codes. The broad angular coverage also allowed the determination of
average neutron multiplicities above 2 MeV. Deficiencies in some of the models
commonly used for applications are pointed out.


title: Imaging Sources with Fast and Slow Emission Components

abstract:
  We investigate two-proton correlation functions for reactions in which fast
dynamical and slow evaporative proton emission are both present. In such cases,
the width of the correlation peak provides the most reliable information about
the source size of the fast dynamical component. The maximum of the correlation
function is sensitive to the relative yields from the slow and fast emission
components. Numerically inverting the correlation function allows one to
accurately disentangle fast dynamical from slow evaporative emission and
extract details of the shape of the two-proton source.


title: Strange Particle Production from SIS to LHC

abstract:
  >1A review of meson emission in heavy ion collisions at incident energies
from SIS up to collider energies is presented. A statistical model assuming
chemical equilibrium and local strangeness conservation (i.e. strangeness
conservation per collision) explains most of the observed features.
  Emphasis is put onto the study of $K^+$ and $K^-$ emission at low incident
energies. In the framework of this statistical model it is shown that the
experimentally observed equality of $K^+$ and $K^-$ rates at
``threshold-corrected'' energies $\sqrt{s} - \sqrt{s_{th}}$ is due to a
crossing of two excitation functions. Furthermore, the independence of the
$K^+$ to $K^-$ ratio on the number of participating nucleons observed between
SIS and RHIC is consistent with this model.
  It is demonstrated that the $K^-$ production at SIS energies occurs
predominantly via strangeness exchange and this channel is approaching chemical
equilibrium. The observed maximum in the $K^+/\pi^+$ excitation function is
also seen in the ratio of strange to non-strange particle production. The
appearance of this maximum around 30 $A\cdot$GeV is due to the energy
dependence of the chemical freeze-out parameters $T$ and $\mu_B$.


title:
Centrality dependence of pi^[+/-], K^[+/-], p and p-bar production from
  sqrt(s_NN)=130 GeV Au + Au collisions at RHIC

abstract:
  Identified pi^[+/-] K^[+/-], p and p-bar transverse momentum spectra at
mid-rapidity in sqrt(s_NN)=130 GeV Au-Au collisions were measured by the PHENIX
experiment at RHIC as a function of collision centrality. Average transverse
momenta increase with the number of participating nucleons in a similar way for
all particle species. The multiplicity densities scale faster than the number
of participating nucleons. Kaon and nucleon yields per participant increase
faster than the pion yields. In central collisions at high transverse momenta
(p_T greater than 2 GeV/c), anti-proton and proton yields are comparable to the
pion yields.


title: Studies of reaction dynamics in the Fermi energy domain

abstract:
  An overview of recent results on reaction dynamics in the energy region 20 -
50 A.MeV is given. The results of the study of projectile multifragmentation
using the detector array FAUST are presented. Reaction mechanism is determined
and thermodynamical properties of the hot quasiprojectile are investigated.
Preliminary results on fragment isospin asymmetry obtained using the 4$\pi$
detector array NIMROD are given. Procedure for selecting centrality in
two-dimensional multiplicity histograms is described. Possibility to extract
thermodynamical temperature from systematics of isotope ratios is investigated.
Reaction mechanism leading to production of hot sources is discussed.
Furthermore, the possibilities for production of rare isotopes are discussed
and recent experimental results obtained using recoil separator MARS are
presented.


title:
Coherent Photon-Pomeron and Photon-Photon Interactions in
  Ultra-Peripheral Collisions at RHIC

abstract:
  Ultra-peripheral heavy ion collisions involve long range electromagnetic
interactions at impact parameters larger than twice the nuclear radius, where
no nucleon-nucleon collisions occur. The first observation of coherent rho^0
production with and without accompanying nuclear breakup, AuAu->Au*Au*rho^0 and
AuAu->Au Au rho^0 respectively, and the observation of e+e- pair production
AuAu->Au*Au*e+e- are presented by the STAR collaboration. The transverse
momentum spectra are peaked at low pT, showing the coherent coupling to the
nuclei. A clear rho^0 signal is observed in the two pion invariant mass
spectrum.


title:
Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0
  reaction at the energy of the Delta(1232) resonance

abstract:
  In a p(e_pol,e'p)pi_0 out-of-plane coincidence experiment at the
3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry
has been precisely measured around the energy of the Delta(1232) resonance and
Q^2 = 0.2 (GeV/c)^2. The results are in disagreement with three up-to-date
model calculations. This is interpreted as lack of understanding of the
non-resonant background, which in dynamical models is related to the pion
cloud.


title:
Mass and charge identification of fragments detected with the Chimera
  Silicon-CsI(Tl) telescopes

abstract:
  Mass and charge identification of charged products detected with
Silicon-CsI(Tl) telescopes of the Chimera apparatus is presented. An
identification function, based on the Bethe-Bloch formula, is used to fit
empirical correlation between Delta E and E ADC readings, in order to
determine, event by event, the atomic and mass numbers of the detected charged
reaction products prior to energy calibration.


title:
Analysing powers for the reaction $\vec{\rm n} {\rm p} \to {\rm p} {\rm
  p} \pi^{-}$ and for np elastic scattering from 270 to 570 MeV

abstract:
  The analysing power of the reaction ${\rm n}{\rm p} \to {\rm p}{\rm p}
\pi^{-}$ for neutron energies between threshold and 570 MeV has been determined
using a transversely polarised neutron beam at PSI. The reaction has been
studied in a kinematically complete measurement using a time-of-flight
spectrometer with large acceptance. Analysing powers have been determined as a
function of the c.m. pion angle in different regions of the proton-proton
invariant mass. They are compared to other data from the reactions ${\rm n}{\rm
p} \to {\rm p}{\rm p} \pi^{-}$ and ${{\rm p}{\rm p} \to {\rm p}{\rm p}
\pi^{0}}$. The np elastic scattering analysing power was determined as a
by-product of the measurements.


title:
Analyzing power of the ${\vec p}p \to pp{\pi}^0$ reaction at beam energy
  of 390 MeV

abstract:
  The analyzing power of ${\vec p}p\to pp{\pi}^0$ reaction has been measured at
the beam energy of 390 MeV. The missing mass technique of final protons has
been applied to identify the $\pi^0$ production event. The dependences of the
analyzing power on the pion emission-angle and the relative momentum of the
protons have beenobtained. The angular dependence could be decomposed by the
Legendre polynomial and the relative contribution of the $P_{21}$ to $P_{11}$
function is less than 20%. The P-state amplitude is found to be the dominant
component of the $\pi$ production near the threshold. The momentum dependence
of the analyzing power has been studied to obtain the information about the
pion production mechanism. It has been deduced that the pion production due to
the long range interaction plays an important role in the momentum dependence
of the P-state amplitude.


title:
Search for Delta^++ component in 12^C ground state using 12^C(gamma,
  pi^+ p) reaction

abstract:
  The differential cross section for the $^{12}$C$(\gamma,\pi^{+}p)$ reaction
has been measured in the $\Delta$(1232) resonance region at high recoil momenta
of the residual nuclear system. The data are analyzed under the assumption that
the formation of the $\pi^+p$ pairs may be interpreted as a
$\gamma\Delta^{++}\to\pi^+p$ process which takes place on a $\Delta^{++}$
preexisting in the target nucleus. Estimates of the $\Delta^{++}$ momentum
distribution $\rho_{\Delta^{++}}(\bar{p})$=0.17 fm$^3$ for a mean momentum
$\bar{p}=300\pm49$ MeV/c as well as the number of $\Delta$ isobars per nucleon
$N_\Delta=0.017$ were obtained for $^{12}$C.


title:
Equilibrium, Isoscaling and Nuclear Isotope Thermometry Related to 1 Gev
  Proton Induced Reactions

abstract:
  Yields of isotopically separated light fragments and residual nuclei produced
in p(1GeV)+A collisions have been analyzed. For both fragmentation and
spallation reactions isotopic scaling, i.e. factorization of the isotope
ratios, was observed. A generalized isoscaling for arbitrary combinations of
two systems has been demonstrated. The average isotopic temperature about 4 MeV
for fragmentation process was found.


title: Backward spin polarizability $\gamma_\pi$ of the proton

abstract:
  Using the Mainz $48 cm {\O}\times 64 cm$ NaI(Tl) detector and the segmented
G\"ottingen recoil detector SENECA in coincidence, Compton scattering by the
proton at $\theta^{lab}_\gamma = 136^\circ$ has been measured at MAMI (Mainz)
in the energy range from 200 to 470 MeV. The new data confirm the previous
observation that there is a systematic discrepancy between MAMI and LEGS
(Brookhaven) data leading to different spin polarizabilities $\gamma_\pi = -
38.7 \pm 1.8$ and $-27.2 \pm 3.1$ $(\times 10^{-4}fm^4)$, respectively.


title:
A Honeycomb Proportional Counter for Photon Multiplicity Measurement in
  the ALICE Experiment

abstract:
  A honeycomb detector consisting of a matrix of 96 closely packed hexagonal
cells, each working as a proportional counter with a wire readout, was
fabricated and tested at the CERN PS. The cell depth and the radial dimensions
of the cell were small, in the range of 5-10 mm. The appropriate cell design
was arrived at using GARFIELD simulations. Two geometries are described
illustrating the effect of field shaping. The charged particle detection
efficiency and the preshower characteristics have been studied using pion and
electron beams. Average charged particle detection efficiency was found to be
98%, which is almost uniform within the cell volume and also within the array.
The preshower data show that the transverse size of the shower is in close
agreement with the results of simulations for a range of energies and converter
thicknesses.


title:
Production of Super Heavy Elements at GANIL: present status and
  perspectives

abstract:
  Experiments on the production and study of superheavy nuclei have been
undertaken at GANIL taking advantages of the powerful velocity filter LISE3 and
the high intensity ECR ion sources. A complete set-up has been built: -
reaction chamber containing large rotating wheels, - slits and beam profiler at
mid-filter, - detection chamber with time-of-flight and Silicon detectors for
identifying evaporation residues and their decay products. The response was
checked via fusion reactions with known cross sections producing known
alpha-decay chains and fission fragments. Excellent transmission of evaporation
residues and rejection factor for the primary beam were obtained. This device
is presented together with the results obtained in our last experiments and our
future plans are discussed.


title: Lambda production in 40 A GeV/c Pb-Au collisions

abstract:
  During the 1999 lead run, CERES has measured hadron and electron-pair
production at 40 A GeV/c beam momentum with the spectrometer upgraded by the
addition of a radial TPC. Here the analysis of lambda and antilambda will be
presented.


title: Direct Photon Production in Heavy Ion Reactions at SPS and RHIC

abstract:
  A review on experimental results for direct photon production in heavy ion
reactions is given. A brief survey of early direct photon limits from SPS
experiments is presented. The first measurement of direct photons in heavy ion
reactions from the WA98 collaboration is discussed and compared to theoretical
calculations. An outlook on the perspective of photon measurements at RHIC is
given.


title:
Precise validation of neutron cross section data bases using a lead
  slowing down spectrometer and simulation from 0.1 eV to 40 keV. Methodology
  and data on thin and thick targets and data bases adjustement

abstract:
  Research on accelerator driven systems (ADS), related new fuels and their
ability for nuclear waste incineration has led to a revival of interest in
nuclear cross sections of many nuclides over a large energy range.
Discrepancies observed between nuclear data bases require new measurements in
several cases. A complete measurement of such cross sections including
resonance resolution consists of an extensive beam time experiment associated
to a long process of analysis ans validation. With a slowing down spectrometer
associated to a pulsed neutron source, it is possible to determine good cross
section profile in an energy range from 0.1 eV to 40 keV. These measurements
performed at ISN (Grenoble) with neutron source GENEPI requires only small
quantities of matter (as small as 0.1 g) and about one day of beam per target.


title:
Centrality Dependence of the Charged Particle Multiplicity near
  Mid-Rapidity in Au+Au Collisions at sqrt(s_NN) = 130 and 200 GeV

abstract:
  The PHOBOS experiment has measured the charged particle multiplicity at
mid-rapidity in Au+Au collisions at sqrt(s_NN) = 200 GeV as a function of the
collision centrality. Results on dN/deta(eta<1) divided by the number of
participating nucleon pairs, <Npart/2>, are presented as a function of <Npart>.
As was found from similar data at sqrt(s_NN) = 130 GeV, the data can be equally
well described by parton saturation models and two-component fits which include
contributions that scale as Npart and the number of binary collisions, Ncoll.
We compare the data at the two energies by means of the ratio R(200/130) of the
charged particle multiplicity for the two different energies as a function of
<Npart>. For events with <Npart>>100$, we find that this ratio is consistent
with a constant value of 1.14+-0.01(stat.)+-0.05(syst.).


title: Kaon Phase Space Density in Heavy Ion Collisions

abstract:
  The first measurement of kaon phase space densities are presented as a
function of transverse mass, center of mass energy and the number of
participants. The kaon phase space density increases with the number of
participants from e+e- to Pb+Pb collisions. However the ratio of the kaon and
pion phase space densities at low transverse momentum is independent of the
number of participants for sqrt{s}=17GeV/nucleon
  This paper is dedicated to Francis Riccardelli, engineer for the Port
Authority, who died on September 11th 2001 while evacuating others.


title: Physics Potential of the e-RHIC Based FEL-Nucleus Collider

abstract:
  Main parameters of the FEL-RHIC collider are estimated. The physics search
potential of this machine is illustrated using excitations of the ^{232}Th
nucleus as an example. It is shown that, due to the tunability and
monochromacity of FEL beam and high statistics, proposed collider will play an
important role in the field of ''traditional'' nuclear physics.


title:
Transverse mass dependence of two-pion correlations in Au+Au collisions
  at sqrt(s_NN) = 130 GeV

abstract:
  Two-pion correlations in sqrt(s_NN)=130 GeV Au+Au collisions at RHIC have
been measured over a broad range of pair transverse momentum k_T by the PHENIX
experiment at RHIC. The k_T dependent transverse radii are similar to results
from heavy ion collisions at sqrt(s_NN) = 4.1, 4.9, and 17.3 GeV, whereas the
longitudinal radius increases monotonically with beam energy. The ratio of the
outwards to sidewards transverse radii (R_out/R_side) is consistent with unity
and independent of k_T.


title:
STAR Strangeness Results from sqrt(s_NN) = 130 GeV Au+Au Collisions (and
  first results from 200 GeV)

abstract:
  The STAR Experiment at RHIC is capable of a wide variety of measurements of
the production of strange hadrons in nuclear collisions. Measurements of the
relative production of strange baryons, antibaryons, and kaons can shed light
on the baryon densities achieved in these collisions and on the validity of
models for production yields. We will present here preliminary results on these
measurements at RHIC energies of sqrt(s_NN) = 130 GeV and 200 GeV and discuss
comparisons to models.


title: A Fluctuation Probe of Disoriented Chiral Condensates

abstract:
  We show that an event-by-event fluctuation of the ratio of neutral pions or
resulting photons to charged pions can be used as an effective probe for the
formation of disoriented chiral condensates. The fact that the neutral pion
fraction produced in case of disoriented chiral condensate formation has a
characteristic extended non gaussian shape, is shown to be the key factor which
forms the basis of the present analysis.


title: The $^3$He(e, e$'$d)p Reaction in q$\omega$-constant Kinematics

abstract:
  The cross section for the $^3$He(e, e$'$d)p reaction has been measured as a
function of the missing momentum $p_m$ in q$\omega$ -constant kinematics at
beam energies of 370 and 576 MeV for values of the three-momentum transfer $q$
of 412, 504 and 604 \mevc. The L(+TT), T and LT structure functions have been
separated for $q$ = 412 and 504 \mevc. The data are compared to three-body
Faddeev calculations, including meson-exchange currents (MEC), and to
calculations based on a covariant diagrammatic expansion. The influence of
final-state interactions and meson-exchange currents is discussed. The
$p_m$-dependence of the data is reasonably well described by all calculations.
However, the most advanced Faddeev calculations, which employ the AV18
nucleon-nucleon interaction and include MEC, overestimate the measured cross
sections, especially the longitudinal part, and at the larger values of $q$.
The diagrammatic approach gives a fair description of the cross section, but
under(over)estimates the longitudinal (transverse) structure function.


title: Lambda production in central Pb+Pb collisions at CERN-SPS energies

abstract:
  In this paper we present recent results from the NA49 experiment for
$\Lambda$ and $\bar{\Lambda}$ hyperons produced in central Pb+Pb collisions at
40, 80 and 158 A$\cdot$GeV. Transverse mass spectra and rapidity distributions
for $\Lambda$ are shown for all three energies. The shape of the rapidity
distribution becomes flatter with increasing beam energy. The multiplicities at
mid-rapidity as well as the total yields are studied as a function of collision
energy including AGS measurements. The ratio $\Lambda/\pi$ at mid-rapidity and
in 4$\pi$ has a maximum around 40 A$\cdot$GeV. In addition, $\bar{\Lambda}$
rapidity distributions have been measured at 40 and 80 A$\cdot$GeV, which
allows to study the $\bar{\Lambda}$/$\Lambda$ ratio.


title: Event Reconstruction in the PHENIX Central Arm Spectrometers

abstract:
  The central arm spectrometers for the PHENIX experiment at the Relativistic
Heavy Ion Collider have been designed for the optimization of particle
identification in relativistic heavy ion collisions. The spectrometers present
a challenging environment for event reconstruction due to a very high track
multiplicity in a complicated, focusing, magnetic field. In order to meet this
challenge, nine distinct detector types are integrated for charged particle
tracking, momentum reconstruction, and particle identification. The techniques
which have been developed for the task of event reconstruction are described.


title:
Non-Observation of the Production of Superheavy Nuclei in the Reaction
  of $^{86]$Kr with $^{208}$Pb

abstract: The published claim for the discovery of element 118 is retracted.


title:
Neutron polarizabilities investigated by quasi-free Compton scattering
  from the deuteron

abstract:
  Measuring Compton scattered photons and recoil neutrons in coincidence,
quasi-free Compton scattering by the neutron has been investigated at MAMI
(Mainz) at $theta^{lab}_\gamma=136^o$ in an energy range from 200 to 400 MeV.
  From the data a polarizability difference of $\alpha_n - \beta_n = 9.8 \pm
3.6(stat)^{+2.1}_{-1.1}(syst)\pm 2.2(model)$ in units of $10^{-4}fm^3$ has been
determined. In combination with the polarizability sum $\alpha_n+\beta_n=
15.2\pm 0.5$ deduced from photo absorption data, the neutron electric and
magnetic polarizabilities, $\alpha_n=12.5\pm 1.8(stat)^{+1.1}_{-0.6}(syst)\pm
1.1(model)$ and $\beta_n = 2.7\mp 1.8(stat)^{+0.6}_{-1.1}(syst)\mp 1.1(model)$,
are obtained.


title:
Experimental results on strangeness production in proton-proton
  collisions at COSY

abstract:
  The production of K+ and K- mesons in elementary proton-proton collision has
been investigated at the Cooler Synchrotron COSY in Juelich. A high quality
proton beam with low emittance and small momentum spread permitted to study the
creation of these mesons very close to the kinematical threshold. The energy
dependence of the total cross section is investigated using internal beam
facilities providing a high accuracy particle momentum determination as well as
an external non-magnetic detection setup with a large geometrical acceptance.
The determination of the four-momentum vectors for all ejectiles of each
registered event gives the complete kinematical information allowing to study
the interaction of the outgoing particles. Results on the performed studies of
the pp --> pp K+ K-, pp --> p Lambda K+ and pp --> p Sigma0 K+ reactions will
be presented and their relevance to the interpretation of heavy ion collisions
will be discussed.


title: Clustering and Correlations in Neutron Haloes

abstract:
  In the present paper clustering and correlations within halo systems is
explored. In particular, the application of neutron-neutron interferometry and
Dalitz-plot type analyses is presented through the example provided by the
dissociation of 14Be. A novel approach for producing and detecting bound
neutron clusters is also described. The observation of some 6 events with
characteristics consistent with the liberation of a multineutron cluster in the
breakup of 14Be -- possibly in the channel 10Be+4n -- is discussed.


title: Systematics of mid-rapidity K-/pi ratio in heavy-ion collisions

abstract:
  It is observed that K-/pi in A+A and possibly p+p and pbar+p collisions
follows an interesting systematic in omega, the pion transverse energy per unit
of rapidity and transverse overlap area. The systematics show a linear increase
of K-/pi with omega in the AGS and SPS energy regime and a saturation at RHIC
energy. The systematics indicate that omega might be the relevant variable
underlying K-/pi. At high energy, the omega variable is related to the gluon
saturation scale in high density QCD, and perhaps to the initial energy density
in the Bjorken picture.


title: Energy dependence of kaon production in central Pb+Pb collisions

abstract:
  Recent results from the NA49 experiment on the energy dependence of charged
kaon production in central Pb+Pb collisions are presented. First results from
the new data at 80 AGeV beam energy are compared with those from lower and
higher energies. A difference in the energy dependence of the <K^{+}>/<\pi^{+}>
and <K^{-}>/<\pi^{-}> ratios is observed. The <K^{+}>/<\pi^{+}> ratio shows a
non-monotonic behaviour with a maximum near 40 AGeV.


title:
Universal fluctuations: a new approach to the study of "phase
  transitions" in intermediate energy heavy ion collisions

abstract:
  The universal theory of order parameter fluctuations (delta scaling laws) is
applied to a wide range of intermediate energy heavy-ion collision data
obtained with INDRA. This systematic study confirms that the observed fragment
production is compatible with aggregation scenarios for in- or
out-of-equilibrium continuous phase transitions, while not showing any sign of
critical behaviour or phase coexistence. We stress the importance of the
methodology employed in order to gain further insight into the mechanism(s)
responsible.


title: 8Be cluster emission versus alpha evaporation in 28Si + 12C

abstract:
  The possible occurence of highly deformed configurations in the $^{40}$Ca
di-nuclear system formed in the $^{28}$Si + $^{12}$C reaction is investigated
by analyzing the spectra of emitted light charged particles. Both inclusive and
exclusive measurements of the heavy fragments (A $\geq$ 10) and their
associated light charged particles (protons and $\alpha$ particles) have been
made at the IReS Strasbourg {\sc VIVITRON} Tandem facility at bombarding
energies of $E_{lab}$ ($^{28}$Si) = 112 MeV and 180 MeV by using the {\sc
ICARE} charged particle multidetector array. The energy spectra, velocity
distributions, in-plane and out-of-plane angular correlations of light charged
particles are compared to statistical-model calculations using a consistent set
of parameters with spin-dependent level densities. This spin dependence
approach suggests the onset of large nuclear deformation in $^{40}$Ca at high
spin. This conclusion might be connected with the recent observation of
superdeformed bands in the $^{40}$Ca nucleus. The analysis of $\alpha$
particles in coincidence with $^{32}$S fragments suggests a surprisingly strong
$^{8}$Be cluster emission of a binary nature.


title: Probing Halo and Molecular States in Light, Neutron-Rich Nuclei

abstract:
  Selected topics on halo and molecular states in light, neutron-rich nuclei
are discussed. In particular, work on $x\alpha$:X$n$ structures is briefly
reviewed. The use of proton radiative capture as a probe of clustering is also
presented through the example provided by the $^6$He(p,$\gamma$) reaction.


title:
Measurement of single electrons and implications for charm production in
  Au+Au collisions at sqrt(s_NN)= 130 GeV

abstract:
  Transverse momentum spectra of electrons from Au+Au collisions at sqrt(s_NN)
= 130 GeV have been measured by the PHENIX experiment at RHIC. The spectra show
an excess above the background from photon conversions and light hadron decays.
The electron signal is consistent with that expected from semi-leptonic decays
of charm. The yield of the electron signal dN_e/dy for p_T > 0.8 GeV/c is 0.025
+/- 0.004 (stat.) +/- 0.010 (sys.) in central collisions, and the corresponding
charm cross section is 380 +/- 60 (stat.) +/- 200 (sys.) micro barns per binary
nucleon-nucleon collision.


title: Survey of experimental data

abstract:
  >A review of meson emission in heavy ion collisions at incident energies from
SIS up to collider energies is presented. A statistical model assuming chemical
equilibrium and local strangeness conservation (i.e. strangeness conservation
per collision) explains most of the observed features.
  Emphasis is put onto the study of $K^+$ and $K^-$ emission at low incident
energies. In the framework of this statistical model it is shown that the
experimentally observed equality of $K^+$ and $K^-$ rates at
``threshold-corrected'' energies $\sqrt{s} - \sqrt{s_{th}}$ is due to a
crossing of two excitation functions. Furthermore, the independence of the
$K^+/K^-$ ratio on the number of participating nucleons observed between SIS
and RHIC is consistent with this model.
  It is demonstrated that the $K^-$ production at SIS energies occurs
predominantly via strangeness exchange and that this channel is approaching
chemical equilibrium. The observed maximum in the $K^+/\pi^+$ excitation
function is also seen in the ratio of strange to non-strange particle
production. The appearance of this maximum around 30 $A\cdot$GeV is due to the
energy dependence of the chemical freeze-out parameters $T$ and $\mu_B$.


title:
Modeling of the saturation current of a fission chamber taking into
  account the distorsion of electric field due to space charge effects

abstract:
  Fission chambers were first made fifty years ago for neutron detection. At
the moment, the French Atomic Energy Commission \textsf{(CEA-Cadarache)} is
developing a sub-miniature fission chamber technology with a diameter of 1.5 mm
working in the current mode (Bign). To be able to measure intense fluxes, it is
necessary to adjust the chamber geometry and the gas pressure before testing it
under real neutron flux. In the present paper, we describe a theoretical method
to foresee the current-voltage characteristics (sensitivity and saturation
plateau) of a fission chamber whose geometrical features are given, taking into
account the neutron flux to be measured (spectrum and intensity). The proposed
theoretical model describes electric field distortion resulting from charge
collection effect. A computer code has been developed on this model basis. Its
application to 3 kinds of fission chambers indicates excellent agreement
between theoretical model and measured characteristics.


title: Status Report on the Light Baryonic States

abstract:
  The regularities in the spectrum of the light baryon resonances are reviewed
and compared with those of the light mesons. We discuss the occurrence of
parity doublets and clusters, and note the trends in the values of the masses,
widths, spins, and parities. The importance of SU(3) flavor is illustrated and
the status of quark model calculations of the baryonic spectrum is reviewed.
The absence of evidence for baryonic hybrids is particularly interesting. We
propose to use better symbols for the baryon resonances which do not conflict
with the simple quark structure of QCD. We shall comment also on fine tuning
the Star System for the hadronic states. The importance of greater support for
the construction and operation of secondary beams of $\pi$, $K$, $\bar p$,
$\vec{n}$ and $\vec\gamma$ up to 5 GeV/$c$ for the future of non-perturbative
QCD is emphasized.


title: Meson-Nucleon Physics: Past, Present and Future

abstract:
  We will present some thoughts on the following topics:
  1. Major highlights in the history of strong interactions such as isospin,
the pion, SU(3), quarks, the color degree of freedom, QCD.
  2. Topics of high current interest such as quark confinement, the origin of
mass, the search for the gluon degrees of freedom, chiral symmetry, flavor
symmetry, regularities in the properties of the light-baryon families (parity
doublets, clusters) decay patterns, hadronization, chiral restoration,
effective Lagrangians and their degrees of freedom.
  3. The input parameters for QCD and for effective models.
  4. Hadron physics as a necessary aspect of precision tests of the Standard
Model and of the Search for New Physics.


title:
In Search of the f0 (or "sigma") Meson: New data on pi0 pi0 Production
  by pi- and K- on Hydrogen

abstract:
  We present preliminary results on the cross sections and Dalitz-plot
densities for the process pi- p -> pi0 pi0 n from threshold to p(pi)=750 MeV/c
as well as for K- p -> pi0 pi0 Lambda and K- p -> pi0 pi0 Sigma0 at p(K)=520 to
750 MeV/c. We have found that sigma(tot)(pi- p -> pi0 pi0 n) ~= 2sigma(tot)(K-
p -> pi0 pi0 Lambda). The pi0 pi0 n Dalitz plots are very nonuniform,
expecially for the higher p(pi), with a high concentration of events on an
"island" around m(pi n) ~= 1.2 GeV and Gamma ~= 0.1 GeV peaking at high pi0 pi0
invariant mass. This is indicative of the dominant role of the
Delta0(1234)(3/2^+) resonance in the final state.
  The pi0 pi0 Lambda Dalitz plots are strikingly similar to the ones for pi0
pi0 n except that the island is concentrated at m(pi Lambda) ~= 1.38 GeV and
has a narrower width, Gamma ~= 0.05 GeV. This indicates the dominant role of
the Sigma0(1385)(3/2+) resonance. The similarity in the Dalitz plots and the
proportionality of the total cross sections are an impressive testimony of the
applicability of broken SU(3) flavor symmetry to reaction dynamics. We have
measured sigma(tot)(K- p -> pi0 pi0 Lambda) ~= 6sigma(tot)(K- p -> pi0 pi0
Sigma0) and observed that the Dalitz plots for these processes are very
different. The Dalitz plots for pi0 pi0 Sigma0 show some enhancement at low pi0
pi0 invariant mass, and there is good indication for the Lambda(1405)
intermediate state but there is no island; at the highest p(K), there is some
evidence for the Lambda(1520) intermediate state. The above features of pi0 pi0
production by pi- and K- can all be understood if f0 production is small.


title: The Neutral Decay Modes of the Eta-Meson

abstract:
  The neutral decay modes of the eta meson are reviewed. The most recent
results obtained with the Crystal Ball multiphoton detector at BNL are
incorporated. This includes a new, precise result for the slope parameter alpha
of the Dalitz plot in eta -> 3pi0 decay and a new, lower branching ratio for
eta -> pi0 gamma gamma which is consistent with chiral perturbation theory.
Recently-obtained limits are given for novel tests of CP and C invariance based
on several rare eta decays.


title: High Energy Beam Test of the PHENIX Lead-Scintillator EM Calorimeter

abstract:
  In the PHENIX experiment at RHIC, the electro-magnetic calorimeter plays an
important role in both the heavy-ion and spin physics programs for which it was
designed. In order to measure its performance in the energy range up to 80GeV,
a beam test was performed at the CERN-SPS H6 beam line. We describe the beam
test and present results on calorimeter performance with pion and electron
beams.


title: Kaon and Antikaon Production in Heavy Ion Collisions at 1.5 AGeV

abstract:
  At the Kaon Spectrometer KaoS at SIS, GSI the production of kaons and
antikaons in heavy ion reactions at a beam energy of 1.5 AGeV has been measured
for the collision systems Ni+Ni and Au+Au. The K-/K+ ratio is found to be
constant for both systems and as a function of impact parameter but the slopes
of K+ and K- spectra differ for all impact parameters. Furthermore the
respective polar angle distributions will be presented as a function of
centrality.


title: Precise Measurement of Muon Capture on the Proton

abstract:
  The aim of the MuCap experiment is a 1% measurement of the singlet capture
rate Lambda_S for the basic electro-weak reaction mu + p -> n + nu_mu. This
observable is sensitive to the weak form-factors of the nucleon, in particular
to the induced pseudoscalar coupling constant g_P. It will provide a rigorous
test of theoretical predictions based on the Standard Model and effective
theories of QCD. The present method is based on high precision lifetime
measurements of mu^- in hydrogen gas and the comparison with the free mu^+
lifetime. The mu^- experiment will be performed in ultra-clean,
deuterium-depleted H_2 gas at 10 bar. Low density compared to liquid H_2 is
chosen to avoid uncertainties due to ppmu formation. A time projection chamber
acts as a pure hydrogen active target. It defines the muon stop position in 3-D
and detects rare background reactions. Decay electrons are tracked in
cylindrical wire-chambers and a scintillator array covering 75% of 4 pi.


title: Photon Multiplicity Measurements : From SPS to RHIC and LHC

abstract:
  Results from the photon multiplicity measurements using a fine granularity
preshower photon multiplicity detector (PMD) at CERN SPS are discussed. These
include study of pseudo-rapidity distributions of photons, scaling of photon
multiplicity with number of participating nucleons, centrality dependence of
mean transverse momentum of photons, event-by-event fluctuations in photon
multiplicity and localised charged-neutral fluctuations. Basic features of the
PMD to be used in STAR experiment at RHIC and in ALICE experiment at LHC are
also discussed.


title: Lead Perchlorate as a Neutrino Detection Medium

abstract:
  Lead can be an ideal medium for the detection and study of neutrinos. Such a
detector may be realized through the use of a lead perchlorate solution as a
Cerenkov radiator. The basic physical properties of lead perchlorate solution
are given and preparation of the solution for use in a Cerenkov detector is
described. Results from investigations of light transmission in lead
perchlorate solutions are also presented.


title: Neutron beam test of CsI crystal for dark matter search

abstract:
  We have studied the response of Tl-doped and Na-doped CsI crystals to nuclear
recoils and $\gamma$'s below 10 keV. The response of CsI crystals to nuclear
recoil was studied with mono-energetic neutrons produced by the
$^3$H(p,n)$^3$He reaction. This was compared to the response to Compton
electrons scattered by 662 keV $\gamma$-ray. Pulse shape discrimination between
the response to these $\gamma$'s and nuclear recoils was studied, and quality
factors were estimated. The quenching factors for nuclear recoils were derived
for both CsI(Na) and CsI(Tl) crystals.


title:
Polarization transfer in the $^{16}$O$(p,p')$ reaction at forward angles
  and structure of the spin-dipole resonances

abstract:
  Cross sections and polarization transfer observables in the $^{16}$O$(p,p')$
reactions at 392 MeV were measured at several angles between $\theta_{lab}=$
0$^\circ$ and 14$^\circ$. The non-spin-flip (${\Delta}S=0$) and spin-flip
(${\Delta}S=1$) strengths in transitions to several discrete states and broad
resonances in $^{16}$O were extracted using a model-independent method. The
giant resonances in the energy region of $E_x=19-$27 MeV were found to be
predominantly excited by ${\Delta}L=1$ transitions. The strength distribution
of spin-dipole transitions with ${\Delta}S=1$ and ${\Delta}L=1$ were deduced.
The obtained distribution was compared with a recent shell model calculation.
Experimental results are reasonably explained by distorted-wave impulse
approximation calculations with the shell model wave functions.


title:
Elastic $\alpha$-transfer in the elastic scattering of $^{\bf
  16}$O$+^{\bf 12}$C

abstract:
  The elastic scattering $^{16}$O$+^{12}$C angular distributions at $^{16}$O
bombarding energies of 100.0, 115.9 and 124.0 MeV and their optical model
description including the $\alpha$-particle exchange contribution calculated in
the Coupled Reaction Channel approach are presented. The angular distributions
show not only the usual diffraction pattern but also, at larger angles,
intermediate structure of refractive origin on which finer oscillations are
superimposed. The large angle features can be consistently described including
explicitly the elastic $\alpha$-transfer process and using a refractive optical
potential with a deep real part and a weakly absorptive imaginary part.


title:
Results from FOPI on strangeness production and propagation at SIS
  energies

abstract:
  Heavy ion collisions at SIS energies (1-2 AGeV) offer an unique tool to probe
the properties of hot and dense nuclear matter. In particular, the partial
restoration of chiral symmetry is predicted to lead in this energy range to
in-medium modifications of hadron properties. Strange particle production below
or close to the threshold energy is a useful probe to investigate these
in-medium effects. The FOPI collaboration has recently measured the production
and the propagation of charged and neutral strange particles. The K+ production
probability is investigated as a function of the system size at a beam energy
of 1.5 AGeV. Results on K0 production in Ru+Ru collisions at 1.69 AGeV are
presented, as well as K-/K+ ratio as a function of rapidity. In addition, the
sideward flow of charged and neutral strange particles has been measured.
Results are compared to predictions of transport calculations (BUU and IQMD).


title: High-pT Neutral Pion Production in Heavy Ion Collisions at SPS and RHIC

abstract:
  Transverse momentum spectra for neutral pions have been measured by the WA98
experiment in sqrt{s_{nn}}=17.3 GeV Pb+Pb collisions at the CERN SPS and by the
PHENIX experiment in sqrt{s_{nn}}=130 GeV Au+Au collisions at RHIC. The neutral
pion yields in central collisions for both reaction systems are compared to
scaled transverse momentum spectra for nucleon-nucleon reactions at the
respective energy. At SPS energies neutral pion production at high $p_T$ is
enhanced compared to the n+n reference while at RHIC a significant suppression
of high-pT neutral pions is observed.


title: Particle production in central Pb+Pb collisions at 158 A GeV/c

abstract:
  The NA44 experiment has measured single particle inclusive spectra for
charged pions, kaons, and protons as a function of transverse mass near
mid-rapidity in 158 A GeV/$c$ Pb+Pb collisions.
  From the particle mass dependence of the observed $m_T$ distributions, we are
able to deduce a value of about 120 MeV for the temperature at thermal
freeze-out.
  From the observed ratios of the rapidity densities, we find values of the
chemical potentials for light and strange quarks and a chemical freeze-out
temperature of approximately 140 MeV.


title: Producing Slow Antihydrogen for a Test of CPT Symmetry with ATHENA

abstract:
  The ATHENA experiment at the Antiproton Decelerator facility at CERN aims at
testing CPT symmetry with antihydrogen. An overview of the experiment, together
with preliminary results of development towards the production of slow
antihydrogen are reported.


title:
Evidence of kaon nuclear and Coulomb potential effects on soft K+
  production from nuclei

abstract:
  The ratio of forward K+ production on copper, silver and gold targets to that
on carbon has been measured at proton beam energies between 1.5 and 2.3 GeV as
a function of the kaon momentum p_K using the ANKE spectrometer at
COSY-Juelich. The strong suppression in the ratios observed for p_K<200-250
MeV/c can be ascribed to a combination of Coulomb and nuclear repulsion in the
K+A system. This opens a new way to investigate the interaction of K+-mesons in
the nuclear medium. Our data are consistent with a K+A nuclear potential of
V_K~20 MeV at low kaon momenta and normal nuclear density. Given the
sensitivity of the data to the kaon potential, the current experimental
precision might allow one to determine V_K to better than 3 MeV.


title: UltraPeripheral Collisions in STAR

abstract:
  Ultra-peripheral heavy ion collisions involve long range electromagnetic
interactions at impact parameters larger than twice the nuclear radius, where
no hadronic nucleon-nucleon collisions occur. The first observation of coherent
rho production with and without nuclear breakup, along with the observation of
ee pair production, are reported by the STAR collaboration.


title:
Multifragmentation and the Phase Transition: A Systematic Study of the
  MF of 1A GeV Au, La, and Kr

abstract:
  A systematic analysis of the multifragmentation (MF) in fully reconstructed
events from 1A GeV Au, La and Kr collisions with C has been performed. This
data is used to provide a definitive test of the variable volume version of the
statistical multifragmentation model (SMM). A single set of SMM parameters
directly determined by the data and the semi-empiricalmass formula are used
after the adjustable inverse level density parameter, $\epsilon_{o}$ is
determined by the fragment distributions. The results from SMM for second stage
multiplicity, size of the biggest fragment and the intermediate mass fragments
are in excellent agreement with the data. Multifragmentation thresholds have
been obtained for all three systems using SMM prior to secondary decay. The
data indicate that both thermal excitation energy $E_{th}^{*}$ and the isotope
ratio temperature $T_{He-DT}$ decrease with increase in system size at the
critical point. The breakup temperature obtained from SMM also shows the same
trend as seen in the data. The SMM model is used to study the nature of the MF
phase transition. The caloric curve for Kr exhibits back-bending (finite latent
heat) while the caloric curves for Au and La are consistent with a continuous
phase transition (nearly zero latent heat) and the values of the critical
exponents $\tau$, $\beta$ and $\gamma$, both from data and SMM, are close to
those for a 'liquid-gas' system for Au and La. We conclude that the larger
Coulomb expansion energy in Au and La reduces the latent heat required for MF
and changes the nature of the phase transition. Thus the Coulomb energy plays a
major role in nuclear MF.


title: The 8Li Calibration Source for the Sudbury Neutrino Obervatory

abstract:
  A calibration source employing 8Li (t_1/2 = 0.838s) has been developed for
use with the Sudbury Neutrino Observatory (SNO). This source creates a spectrum
of beta particles with an energy range similar to that of the SNO 8B solar
neutrino signal. The source is used to test the SNO detector's energy response,
position reconstruction and data reduction algorithms. The 8Li isotope is
created using a deuterium-tritium neutron generator in conjunction with a 11B
target, and is carried to a decay chamber using a gas/aerosol transport system.
The decay chamber detects prompt alpha particles by gas scintillation in
coincidence with the beta particles which exit through a thin stainless steel
wall. A description is given of the production, transport, and tagging
techniques along with a discussion of the performance and application of the
source.


title: A tentative 4- isomeric state in Sr-98

abstract:
  Annual Report 2001, Institut fuer Kernchemie,
Johannes-Gutenberg-Universitaet, Mainz, Germany


title:
Fragment production in central heavy-ion collisions: reconciling the
  dominance of dynamics with observed phase transition signals through
  universal fluctuations

abstract:
  Fragment production in central collisions of Xe+Sn has been systematically
studied with the INDRA multidetector from 25 to 150 AMeV. The predominant role
of collision dynamics is evidenced in multiple intermediate mass fragment
production even at the lowest energies, around the so-called
"multifragmentation threshold". For beam energies 50 AMeV and above, a
promising agreement with suitably modified Antisymmetrised Molecular Dynamics
calculations has been achieved. Intriguingly the same reactions have recently
been interpreted as evidence for a liquid-gas phase transition in
thermodynamically equilibrated systems. The universal fluctuation theory,
thanks to its lack of any equilibrium hypothesis, shows clearly that in all but
a tiny minority of carefully-selected central collisions fragment production is
incompatible with either critical or phase coexistence behaviour. On the other
hand, it does not exclude some similarity with aggregation scenarios such as
the lattice-gas or Fisher droplet models.


title: Thermal bremsstrahlung probing the nuclear liquid-gas phase transition

abstract:
  We present the results of the analysis of the hard photon production in the
$^{129}${Xe}+$^{\rm nat}${Sn} at 50{\it A} MeV system studied in the GANIL E300
experiment. The energy and angular hard photon distributions confirm the
existence of a thermal component which follows the recently measured thermal
bremsstrahlung systematics. Exploiting the performances of our complete
detection system, consisting of TAPS and 3 charged particle multidetectors, we
have also measured the hard photon multiplicity as a function of the charged
particle multiplicity.


title:
Average (RECOMMENDED) Half-Life Values for Two Neutrino Double Beta
  Decay

abstract:
  All existing "positive" results on two neutrino double beta decay in
different nuclei were analyzed. Using procedure recommended by Particle Data
Group weighted average values for half-lives of $^{48}$Ca, $^{76}$Ge,
$^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{100}$Mo - $^{100}$Ru ($0^+_1$),
$^{116}$Cd, $^{150}$Nd and $^{238}$U were obtained. Existing geochemical data
were analyzed and recommended values for half-lives of $^{128}$Te and
$^{130}$Te are proposed. We recommend to use these results as most precise and
reliable values for half-lives at this moment.


title: Baryon resonances and strong QCD

abstract:
  Light-baryon resonances (with u,d, and s quarks in the SU(3) classification)
fall on Regge trajectories. When their squared masses are plotted against the
intrinsic orbital angular momenta {\rm L}, $\Delta^*$'s with even and odd
parity can be described by the same Regge trajectory. For a given {\rm L},
nucleon resonances with spin {\rm S}=3/2 are approximately degenerate in mass
with $\Delta$ resonances. To which total angular momentum {\rm L} and {\rm S}
couple has no significant impact on the baryon mass. Nucleons with spin 1/2 are
shifted in mass; the shift is - in units of squared masses - proportional to
the component in the wave function which is antisymmetric in spin and flavor.
Based on these observations, a new baryon mass formula is proposed which
reproduces nearly all known baryon masses. It is shown that the masses are
compatible with a quark-diquark picture while the richness of the
experimentally known states require three particles to participate in the
dynamics. This conflict is resolved by proposing that quarks polarize the QCD
condensates and are surrounded by a polarization cloud shielding the color. A
new interpretation of constituent quarks as colored quark clusters emerges;
their interaction is responsible for the mass spectrum. Fast flavor exchange
between the colored quark clusters exhausts the dynamical richness of the
three-particle dynamics. The colored-quark-cluster model provides a mechanism
in which the linear confinement potential can be traced to the increase of the
volume in which the condensates are polarized. The quark-spin magnetic moment
induces currents in the polarized condensates which absorb the quark-spin
angular momentum: the proton spin is not carried by quark spins. The model
provides a new picture of hybrids and glueballs.


title: Alpha-decay Rates of Yb and Gd in Solar Neutrino Detectors

abstract:
  The $\alpha$-decay rates for the nuclides $^{168,170,171,172,173,174,176}$Yb
and $^{148,150,152,154}$Gd have been estimated from transmission probabilities
in a systematic $\alpha$-nucleus potential and from an improved fit to
$\alpha$-decay rates in the rare-earth mass region. Whereas ${\alpha}$-decay of
$^{152}$Gd in natural gadolinium is a severe obstacle for the use of gadolinium
as a low-energy solar-neutrino detector, we show that
  ${\alpha}$-decay does not contribute significantly to the background in a
ytterbium detector. An extremely long ${\alpha}$-decay lifetime of $^{168}$Yb
is obtained from calculation, which may be close to the sensitivity limit in a
low-background solar neutrino detector.


title: Dielectron Production in Heavy Ion Collisions at 158 GeV/c per Nucleon

abstract:
  In this paper, the low-mass electron pair production in 158 AGeV/c Pb-Au
collisions is investigated with the Cherenkov Ring Electron Spectrometer
(CERES) at the Super Proton Synchrotron accelerator (SPS) at CERN. The main
goal is to search for modifications of hadron properties in hot and dense
nuclear matter. The presented re-analysis of the 1996 data set is focused on a
detailed study of the combinatorial-background subtraction by means of the
mixed-event technique. The results confirm previous findings of CERES. The
dielectron production in the mass range of 0.25<m(ee)<2GeV/c**2 is enhanced by
a factor of 3.0+-1.3(stat.)+-1.2(syst.) over the expectation from neutral meson
decays. The data is compared to transport model calculations and seem to favor
the version including in-medium effects.
  Furthermore, the development of a new technology to manufacture
ultralightweight mirrors for Ring Imaging Cherenkov detectors (RICH) is
described. Replacement of the RICH-2 glass mirror by a mirror almost
transparent to electrons would considerably improve the performance of the
upgraded CERES detector system including a radial Time Projection Chamber
(TPC).


title:
Search for the Radiative Capture d+d->^4He+\gamma Reaction from the
  dd\mu Muonic Molecule State

abstract:
  A search for the muon catalyzed fusion reaction dd --> ^4He +\gamma in the
dd\mu muonic molecule was performed using the experimental \mu CF installation
TRITON and NaI(Tl) detectors for \gamma-quanta. The high pressure target filled
with deuterium at temperatures from 85 K to 800 K was exposed to the negative
muon beam of the JINR phasotron to detect \gamma-quanta with energy 23.8 MeV.
The first experimental estimation for the yield of the radiative deuteron
capture from the dd\mu state J=1 was obtained at the level n_{\gamma}\leq
2\times 10^{-5} per one fusion.


title:
Differential Transverse Flow in Central C-Ne and C-Cu Collisions at 3.7
  GeV/nucleon

abstract:
  Differential transverse flow of protons and pions in central C-Ne and C-Cu
collisions at a beam energy of 3.7 GeV/nucleon was measured as a function of
transverse momentum at the SKM-200-GIBS setup of JINR. In agreement with
predictions of a transversely moving thermal model, the strength of proton
differential transverse flow is found to first increase gradually and then
saturate with the increasing transverse momentum in both systems. While pions
are preferentially emitted in the same direction of the proton transverse flow
in the reaction of C-Ne, they exhibit an anti-flow to the opposote direction of
the proton transverse flow in the reaction of C-Cu due to stronger shadowing
effects of the heavier target in thr whole range of transverse momentum.


title: Heavy Ion Experiments at RHIC: The First Year

abstract:
  We present a written version of four lectures given at the NATO Advanced
Study Institute on "CD Perspectives on Hot and Dense Matter"in Cargese, Corsica
during August, 2001. Over the last year the first exciting results from the
Relativistic Heavy Ion Collider (RHIC) and the four experiments BRAHMS, PHENIX,
PHOBOS, and STAR have been presented. In these lectures we review the state of
RHIC and the experiments and the most exciting current results from Run I which
took place in 2000. A complete review is not possible yet with many key results
still preliminary or to be measured in Run II, which is currently underway, and
thus the emphasis will be on the approach experimentalists have taken to
address the fundamental physics issues of the field. We have not attempted to
update the RHIC results for this proceedings, but rather present it as a
snapshot of what was discussed in the workshop. The field is developing very
quickly, and benefits greatly from contact and discussions between the
different approaches of experimentalists and theorists.


title:
Heavy Meson Production in NN Collisions with Polarized Beam and Target
  -- A new facility for COSY

abstract:
  The study of near--threshold meson production in pp and pd collisions
involving polarized beams and polarized targets offers the rare opportunity to
gain insight into short--range features of the nucleon--nucleon interaction.
The Cooler Synchrotron COSY at FZ--J\"ulich is a unique environment to perform
such studies. Measurements of polarization observables require a cylindrically
symmetrical detector, capable to measure the momenta and the directions of
outgoing charged hadrons. The wide energy range of COSY leads to momenta of
outgoing protons to be detected in a single meson production reaction between
300 and 2500 MeV/c. Scattering angles of protons to be covered extend to about
$45^{\circ}$ in the laboratory system. An azimuthal angular coverage of the
device around 98% seems technically achievable. The required magnetic
spectrometer could consist of a superconducting toroid, providing fields around
3 T.


title:
Multifragmentation process for different mass asymmetry in the entrance
  channel around the Fermi energy

abstract:
  The influence of the entrance channel asymmetry upon the fragmentation
process is addressed by studying heavy-ion induced reactions around the Fermi
energy. The data have been recorded with the INDRA 4pi array. An event
selection method called the Principal Component Analysis is presented and
discussed. It is applied for the selection of central events and furthermore to
multifragmentation of single source events. The selected subsets of data are
compared to the Statistical Multifragmentation Model (SMM) to check the
equilibrium hypothesis and get the source characteristics. Experimental
comparisons show the evidence of a decoupling between thermal and compresional
(radial flow) degrees of freedom in such nuclear systems.


title:
Sequential Decay Distortion of Goldhaber Model Widths for Spectator
  Fragments

abstract:
  Momentum widths of the primary fragments and observed final fragments have
been investigated within the framework of an Antisymmetrized Molecular Dynamics
transport model code (AMD-V) with a sequential decay afterburner (GEMINI). It
is found that the secondary evaporation effects cause the values of a reduced
momentum width, $\sigma_0$, derived from momentum widths of the final fragments
to be significantly less than those appropriate to the primary fragment but
close to those observed in many experiments. Therefore, a new interpretation
for experiemental momentum widths of projectile-like fragments is presented.


title: Measurements of Charged Current Reactions of muon neutrinos on C12

abstract:
  Charged current scattering of \nu_\mu on ^{12}C has been studied using a
\pi^+ decay-in-flight \nu_\mu beam at the Los Alamos Neutron Science Center. A
sample of 66.9+-9.1 events satisfying criteria for the exclusive reaction
^{12}C(\nu_\mu,\mu^-)^{12}N_{g.s.} was obtained using a large liquid
scintillator neutrino detector. The observed flux-averaged cross section
(5.6+-0.8+-1.0) x 10^{-41} cm^2 agrees well with reliable theoretical
expectations. A measurement was also obtained for the inclusive cross section
to all accessible ^{12}N states ^{12}C(\nu_\mu,\mu^-)X. This flux-averaged
cross section is (10.6+-0.3+-1.8) x 10^{-40} cm^2 which is lower than present
theoretical calculations.