title: Total cross section of the 3H(p,n)3He reaction from threshold to 4.5 MeV

abstract:
  We report new measurements of the total cross section for the 3H(p,n)3He
reaction from threshold (Ep=1.02 MeV) to Ep=4.5 MeV. The experiment utilized
specially prepared Ti-3H targets, and neutrons were detected using a 4-pi
detector. A weak resonant structure due to an excited state in 4He is observed
which was not seen in previous cross section measurements. A new expression for
the 3He(n,p)3H thermonuclear reaction rate for temperatures below 10 GK is
presented which will allow for more accurate calculations of the yields of
light elements produced by big-bang nucleosynthesis.


title: Integrated cross sections for two-photon transitions in 178-Hf

abstract:
  We have calculated integrated cross sections from tabulated nuclear data for
two-photon transitions in 178-Hf, summed over all lower states which are
possible for a given pair of initial and intermediate states. These processes
are of interest for the problem of induced gamma emission. The largest
integrated cross section found among 24 two-photon processes in 178-Hf has the
value 1.65 x 10^{-26} cm^2 keV.


title:
Search for Quadrupole Strength in the Electro-excitation of the
  Delta(1232)

abstract:
  High-precision H(e,e'p)pi0 measurements at Q2=0.126 (GeV/c)2 are reported,
which allow the determination of quadrupole amplitudes in the gamma* N->Delta
transition; they simultaneously test the reliability of electroproduction
models. The derived quadrupole-to-dipole amplitude ratios, Rsm=(-6.5 +-
0.2{stat+sys} +- 2.5{mod}) % and Rem=(-2.1 +- 0.2{stat+sys} +- 2.0{mod}) %, are
dominated by model error. Previous Rsm and Rem results should be reconsidered
after the model uncertainties associated with the method of their extraction
are taken into account.


title: Two-Proton Correlations from PB+PB Central Collisions

abstract:
  The two-proton correlation function at midrapidity from Pb+Pb central
collisions at 158 AGeV has been measured by the NA49 experiment. The
preliminary results are compared to model predictions from proton source
distributions of static thermal Gaussian sources and the transport models of
RQMD and VENUS. We obtain an effective proton source size 4.0 +-0.15(stat.)
+0.06-0.18(syst.) fm. The RQMD model underpredicts the correlation function
(source size 4.41 fm), while the VENUS model overpredicts the correlation
function (source size 3.55 fm).


title: Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar

abstract:
  The positron-neutrino correlation in the $0^+ \to 0^+ \beta$ decay of
$^{32}$Ar was measured at ISOLDE by analyzing the effect of lepton recoil on
the shape of the narrow proton group following the superallowed decay. Our
result is consistent with the Standard Model prediction. For vanishing Fierz
interference we find $a=0.9989 \pm 0.0052 \pm 0.0036$, which yields improved
constraints on scalar weak interactions.


title: Near-Threshold Production of omega Mesons in the pp -> pp omega Reaction

abstract:
  The total cross section for omega production in the pp -> pp omega reaction
has been measured at five c.m. excess energies from 3.8 to 30 MeV. The energy
dependence is easily understood in terms of a strong proton-proton final state
interaction combined with a smearing over the width of the state. The ratio of
near-threshold phi and omega production is consistent with the predictions of a
one-pion-exchange model and the degree of violation of the OZI rule is similar
to that found in the pi-p -> n omega/phi reactions.


title:
New Possibilities for Investigation of TRI Violation with the use of
  Aligned Nuclei

abstract:
  The methods of investigation of Time Reversal Invariance (TRI) violation
using polarized neutron beam and polarized or aligned nuclear target are
briefly considered. The new method of dynamic nuclear alignment (DNA) of
quadrupolar nuclei is proposed. An implementation of this method can
significantly increase the number of aligned nuclei accessible for TRI
violation experiments and for the other physical investigations.


title: Localized Domains of Disoriented Chiral Condensates

abstract:
  A new method to search for localized domains of disoriented chiral
condensates (DCC) has been proposed by utilising the (eta-phi) phase space
distributions of charged particles and photons. Using the discrete wavelet
transformation (DWT) analysis technique, it has been found that the presence of
DCC domains broadens the distribution of wavelet coefficients in comparison to
that of normal events. Strength contours have been derived from the differences
in rms deviations of these distributions by taking into account the size of DCC
domains and the probability of DCC production in ultra-relativistic heavy ion
collisions. This technique can be suitably adopted to experiments measuring
multiplicities of charged particles and photons.


title:
Systematics of Inclusive Photon Production in 158 AGeV Pb Induced
  Reactions on Ni, Nb, and Pb Targets

abstract:
  The multiplicity of inclusive photons has been measured on an event-by-event
basis for 158 AGeV Pb induced reactions on Ni, Nb, and Pb targets. The
systematics of the pseudorapidity densities at midrapidity (rho_max) and the
width of the pseudorapidity distributions have been studied for varying
centralities for these collisions. A power law fit to the photon yield as a
function of the number of participating nucleons gives a value of 1.13+-0.03
for the exponent. The mean transverse momentum, <p_T>, of photons determined
from the ratio of the measured electromagnetic transverse energy and photon
multiplicity, remains almost constant with increasing rho_max. Results are
compared with model predictions.


title: Towards the Quark-Gluon Plasma

abstract:
  An Overview of the status and results from the relativistic heavy ion program
at the AGS and SPS; perspective for future colliders.


title:
Azimuthal Anisotropy of $\eta$ and $\pi^{0}$ Mesons in Heavy-Ion
  Collisions at 2 AGeV

abstract:
  Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity
in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca
are studied as a function of the number of projectile-like spectator nucleons.
The observed anisotropy corresponds to a negative elliptic flow signal for
$\eta$ mesons, indicating a preferred emission perpendicular to the reaction
plane. The effect is smallest in peripheral Ni+Ni collisions. In contrast, for
$\pi^{0}$ mesons, elliptic flow is observed only in peripheral Ni+Ni
collisions, changing from positive to negative sign with increasing pion
transverse momentum.


title:
Centrality Dependence of Kaon Yields in Si+A and Au+Au Collisions at
  Relativistic Energies

abstract:
  Charged kaon production has been measured in Si+Al and Si+Au collisions at
14.6 A GeV/c, and Au+Au collisions at 11.1 A GeV/c by Experiments 859 and 866
(the E--802 Collaboration) at the BNL AGS. Invariant transverse mass spectra
and rapidity distributions for both K+ and K- are presented. The centrality
dependence of rapidity-integrated kaon yields is studied. Strangeness
enhancement is observed as an increase in the slope of the kaon yield with the
total number of participants as well as the yield per participant. The
enhancement starts with peripheral Si+Al and Si+Au collisions (relative to N+N)
and appears to saturate for a moderate number of participating nucleons in
Si+Au collisions. It is also observed to increase slowly with centrality in
Au+Au collisions, to a level in the most central Au+Au collisions that is
greater than that found in central Si+A collisions. The enhancement factor for
$K^+$ production are 3.0 +-0.2(stat.) +-0.4(syst.) and 4.0 +-0.3(stat.)
+-0.5(syst.), respectively, for the most central 7% Si+Au collisions and the
most central 4% Au+Au collisions relative to N+N at the correponding beam
energy.


title:
Elliptic Flow: Transition from out-of-plane to in-plane Emission in Au +
  Au Collisions

abstract:
  We have measured the proton elliptic flow excitation function for the Au + Au
system spanning the beam energy range 2 -- 8 AGeV. The excitation function
shows a transition from negative to positive elliptic flow at a beam energy,
$E_{tr} \sim$ 4 AGeV. Detailed comparisons with calculations from a
relativistic Boltzmann-equation are presented. The comparisons suggest a
softening of the nuclear equation of state (EOS) from a stiff form (K \sim 380
MeV) at low beam energies (E_{Beam} \le 2 AGeV) to a softer form (K \sim 210
MeV) at higher energies (E_{Beam} \ge $ 4 AGeV) where the calculated baryon
density $ \rho \sim 4 \rho_0$.


title:
Statistical Interpretation of Joint Multiplicity Distributions of
  Neutrons and Charged Particles

abstract:
  Experimental joint multiplicity distributions of neutrons and charged
particles emitted in complex nuclear reactions provide an important test of
theoretical models. The method is applied to test three different theoretical
models of nuclear multi-fragmentation, two of which fail the test. The
measurement of neutrons is decisive in distinguishing between the Berlin and
Copenhagen models of nuclear multi-fragmentation and challenges the
interpretation of pseudo- Arrhenius plots. Statistical-model evaporation
calculations with GEMINI give a good reproduction first and second moments of
the experimental multiplicity correlations.


title:
A No-Go Theorem for Matter-Wave Interferometry with Application to the
  Neutron's Electric-Dipole Moment

abstract:
  A theorem that relies only on the unitary property of the Schroedinger
equation and not upon any classical or semi-classical approximation negates
some, but not all, suggestions that have been made for measuring the neutron's
electric-dipole moment by interferometry.


title:
Positron-neutrino correlations in 32Ar and 33Ar Decays: Probes of Scalar
  weak currents and nuclear isospin mixing

abstract:
  The positron-neutrino correlation in the 0^+ \to 0^+ \beta decay of ^{32}Ar
was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of
the narrow proton group following the superallowed decay. Our result is
consistent with the Standard Model prediction; for vanishing Fierz interference
we find a=0.9989 \pm 0.0052 \pm 0.0036. Our result leads to improved
constraints on scalar weak interactions. The positron-neutrino correlation in
^{33}Ar decay was measured in the same experiment; for vanishing Fierz
interference we find a=0.944 \pm 0.002 \pm 0.003. The ^{32}Ar and ^{33}Ar
correlations, in combination with precision measurements of the half-lives,
superallowed branching ratios and beta endpoint energies, will determine the
isospin impurities of the superallowed transitions. These will provide useful
tests of isospin-violation corrections used in deducing |V_{\rm ud}| which
currently indicates non-unitarity of the KM matrix.


title:
Development of a Gd Loaded Liquid Scintillator for Electron
  Anti-Neutrino Spectroscopy

abstract:
  We report on the development and deployment of 11.3 tons of 0.1% Gd loaded
liquid scintillator used in the Palo Verde reactor neutrino oscillation
experiment. We discuss the chemical composition, properties, and stability of
the scintillator elaborating on the details of the scintillator preparation
crucial for obtaining a good scintillator quality and stability.


title: Anisotropic Flow at STAR

abstract:
  We first review previous work on anisotropic flow at the AGS and SPS. Then
the physics related to flow is discussed as well as the interaction of flow
with other non-flow measurements. From 40k RQMD and 100k HIJING events
predictions for anisotropic flow at RHIC are presented. Using the STAR detector
acceptance, estimates for the resolution obtainable with STAR are shown. We
conclude that it should be possible to obtain good measurements for elliptic
flow with either the STAR main TPC or forward TPCs. Anisotropic flow should be
easily one of the first results from STAR.


title: Stimulated Emission of Radiation in a Nuclear Fusion Reaction

abstract:
  This letter claims that process of stimulated emission of radiation can be
used to induce a fusion reaction in a HD molecule to produce Helium-3. An
experimental set-up for this reaction is presented. It is proposed to study the
technical potential of this reaction as an energy amplifier.


title: Fission Hindrance in hot 216Th: Evaporation Residue Measurements

abstract:
  The fusion evaporation-residue cross section for 32S+184W has been measured
at beam energies of E_beam = 165, 174, 185, 196, 205, 215, 225, 236, 246,and
257 MeV using the ATLAS Fragment Mass Analyzer. The data are compared with
Statistical Model calculations and it is found that a nuclear dissipation
strength, which increases with excitation energy, is required to reproduce the
excitation function. A comparison with previously published data show that the
dissipation strength depends strongly on the shell structure of the nuclear
system.


title: Results from the E917 experiment at the AGS

abstract:
  Collisions of Au+Au have been studied at beam kinetic energies of 6, 8, and
10.8 GeV/nucleon at the AGS facility at Brookhaven National Laboratory.
Particles emitted from the collisions were momentum analyzed and identified in
a magnetic spectrometer system. Measurements were made at spectrometer angles
in the range 14deg - 59deg. m_t spectra of protons from central collisions were
analyzed to derive integrated rapidity distributions and inverse slope as a
function of rapidity. The results are compared with a thermal model and it is
concluded that there is either substantial transparency or longitudinal
expansion at all three beam energies.


title:
On the Space-Time Difference of Proton and Composite Particle Emission
  in Central Heavy-Ion Reactions at 400 AMeV

abstract:
  Small-angle correlations of pairs of nonidentical light charged particles
produced in central collisions of heavy ions in the A=100 mass region at a beam
energy of 400 AMeV are investigated with the FOPI detector system at GSI
Darmstadt. The difference of longitudinal correlation functions with the
relative velocity parallel and anti-parallel to the center-of-mass velocity of
the pair in the central source frame is studied. This method allows extracting
the apparent space-time differences of the emission of the charged particles.
Comparing the correlations with results of a final-state interaction model
delivers quantitative estimates of these asymmetries. Time delays as short as 1
fm/c or - alternatively - source radius differences of a few tenth fm are
resolved. The strong collective expansion of the participant zone introduces
not only an apparent reduction of the source radius but also a modification of
the emission times. After correcting for both effects a complete sequence of
space-time emission points of p, d, t, 3He, alpha particles is presented for
the first time.


title: Search for Short Lived Particles in High Multiplicity Environment

abstract:
  A method of statistical selection of short lived particles in high
multiplicity nucleus-nucleus collisions is discussed.


title: Binary Decay of Light Nuclear Systems

abstract:
  A review of the characteristic features found in fully energy-damped,
binarydecay yields from light heavy-ion reactions with $20\leq A_{target} +
A_{projectile}\leq 80$ is presented. The different aspects of these yields that
have been used to support models of compound-nucleus (CN) fission and
deep-inelastic dinucleus orbiting are highlighted. Cross section calculations
based on the statistical phase space at different stages of the reaction are
presented and compared to the experimental results. Although the statistical
models are found to reproduce most of the observed experimental behaviors, an
additional reaction component corresponding to a heavy-ion resonance or
orbiting mechanism is also evident in certain systems. The system dependence of
this second component is discussed. The extent to which the binary yields in
very light systems $(A_{CN} \leq 32)$ can be viewed as resulting from a
fusion-fission mechanism is explored. A number of unresolved questions, such as
whether the different observed behaviors reflect characteristically different
reaction times, are discussed.


title:
Strangeness Production in Au+Au Collisions at the AGS: Recent Results
  from E917

abstract:
  Strangeness production in Au+Au collisions has been measured via the yields
of K+ and K- at 6, 8 AGeV and of anti-Lambda at 10.8 AGeV beam kinetic energy
in experiment E917. By varying the collision centrality and beam energy, a
systematic search for indications of new phenomena and in-medium effects under
high baryon density is undertaken.


title:
A New Measurement of the 1S0 Neutron-Neutron Scattering Length using the
  Neutron-Proton Scattering Length as a Standard

abstract:
  The present paper reports high-accuracy cross-section data for the 2H(n,nnp)
reaction in the neutron-proton (np) and neutron-neutron (nn)
final-state-interaction (FSI) regions at an incident mean neutron energy of
13.0 MeV. These data were analyzed with rigorous three-nucleon calculations to
determine the 1S0 np and nn scattering lengths, a_np and a_nn. Our results are
a_nn = -18.7 +/- 0.6 fm and a_np = -23.5 +/- 0.8 fm. Since our value for a_np
obtained from neutron-deuteron (nd) breakup agrees with that from free np
scattering, we conclude that our investigation of the nn FSI done
simultaneously and under identical conditions gives the correct value for a_nn.
Our value for a_nn is in agreement with that obtained in pion-deuteron capture
measurements but disagrees with values obtained from earlier nd breakup
studies.


title:
Observation of Thermodynamical Properties in the $^{162}$Dy, $^{166}$Er
  and $^{172}$Yb Nuclei

abstract:
  The density of accessible levels in the ($^3$He,$\alpha \gamma$) reaction has
been extracted for the $^{162}$Dy, $^{166}$Er and $^{172}$Yb nuclei. The
nuclear temperature is measured as a function of excitation energy in the
region of 0 -- 6 MeV. The temperature curves reveal structures indicating new
degrees of freedom. The heat capacity of the nuclear system is discussed within
the framework of a canonical ensemble.


title: HBT Studies with E917 at the AGS: A Status Report

abstract:
  Two-particle correlations between pions in Au+Au collisions have been
measured at beam kinetic energies of 6, 8, and 10.8 GeV/u at the Alternating
Gradient Synchrotron (AGS) over a wide range of rapidities using a magnetic
spectrometer. The data have been analyzed in the Hanbury-Brown and Twiss (HBT)
framework to extract source parameters. The event-by-event orientation of the
reaction plane has also been measured using a scintillator hodoscope at far
forward rapidities, and beam vertexing detectors upstream of the target. A
preliminary analysis of the dependence of the source parameters on the reaction
plane is presented.


title: Two-proton correlations from 158 AGeV Pb+Pb central collisions

abstract:
  The two-proton correlation function at midrapidity from Pb+Pb central
collisions at 158 AGeV has been measured by the NA49 experiment. The results
are compared to model predictions from static thermal Gaussian proton source
distributions and transport models RQMD and VENUS. An effective proton source
size is determined by minimizing CHI-square/ndf between the correlation
functions of the data and those calculated for the Gaussian sources, yielding
3.85 +-0.15(stat.) +0.60-0.25(syst.) fm. Both the RQMD and the VENUS model are
consistent with the data within the error in the correlation peak region.


title:
Phase Transitions in Finite Nuclei and the Integer Nucleon Number
  Problem

abstract:
  The study of spherical-deformed ground--state phase transitions in finite
nuclei as a function of N and Z is hindered by the discrete values of the
nucleon number. A resolution of the integer nucleon number problem, and
evidence relating to phase transitions in finite nuclei, are discussed from the
experimental point of view and interpreted within the framework of the
interacting boson model.


title:
Two-Proton Correlations from 14.6A GeV/c Si+Pb and 11.5A GeV/c Au+Au
  Central Collisions

abstract:
  Two-proton correlation functions have been measured in Si+Pb collisions at
14.6A GeV/c and Au+Au collisions at 11.5A GeV/c by the E814/E877 collaboration.
Data are compared with predictions of the transport model RQMD and the source
size is inferred from this comparison. Our analysis shows that, for both
reactions, the characteristic size of the system at freeze-out exceeds the size
of the projectile, suggesting that the fireball created in the collision has
expanded. For Au+Au reactions, the observed centrality dependence of the
two-proton correlation function implies that more central collisions lead to a
larger source sizes.


title: High PT Physics with the STAR Experiment at RHIC

abstract:
  The STAR experiment at RHIC is a TPC-based, general purpose detector designed
to obtain charged particle spectra, with an emphasis on hadrons over a large
phase space. An electromagnetic calorimeter provides measurement of electrons,
photons, pi-zeros and jets. Data-taking with Au+Au collisions at sqrt(s)= 200
GeV/c**2 begins in Fall 1999. The STAR experiment's investigation of techniques
and signals using hard probes to study the high energy-density matter at RHIC
and to search for quark-gluon plasma formation will be described.


title: Strangeness and Antibaryon Production in Heavy-Ion Collisions

abstract:
  We review the experimental results on strangeness and antibaryon production
in heavy-ion collisions at the AGS and SPS. We argue that the observed
enhancement in kaon production at the AGS is consistent with hadronic
description, while the multistrange baryon and antibaryon results at the SPS
may need physics beyond hadronic nature. We call the need for measurements of
low energy antilambda-proton annihilation cross-section in the modeling of
antilambda to antiproton ratio; large value of this ratio is observed in
central heavy-ion collisions at the AGS and SPS. We speculate the importance of
an excitation function measurement of the ratio.


title: Search for eta-mesic nuclei in photoproduction processes

abstract:
  We present preliminary results of an experiment performed at the 1-GeV
electron synchrotron of the Lebedev Physical Institute. Using the
bremsstrahlung photon beam with the end-point energy of 650-850 MeV and the
carbon target, correlated pi+/n pairs with opening angle 180 deg and energies
E_pi=300 MeV, E_n=100 MeV have been observed. They arise from the process gamma
+ 12C -> N + eta + (A-1) -> N + pi+ + n + (A-2) and provide evidence for the
existence of eta-11B and eta-11C eta-mesic nuclei.


title: Two-proton correlations relative to the reaction plane

abstract:
  In this paper we present the preliminary results of the first study of the
proton correlation function's dependence on the orientation of the reaction
plane.


title: Beam energy dependence of two-proton correlations at the AGS

abstract:
  First measurements of the beam energy dependence of the two proton
correlation function in central Au+Au collisions are performed by the E895
Collaboration at the BNL AGS. No significant changes with beam energy were
observed. The imaging technique of Brown-Danielewicz is used in order to
extract information about the space-time content of the proton source at
freeze-out. Extracted source functions show peculiar enhancement at low
relative separation.


title: The Transparency of 12C for Protons

abstract:
  Existing cross-section data for 1p-shell knockout in the reaction 12C(e,e'p)
- as obtained under different kinematic conditions - are shown to be mutually
consistent, apart from a recent measurement performed in Mainz. New data have
been collected at the Amsterdam Pulse Stretcher that confirm the normalization
of the older measurements. An analysis of the world's 12C(e,e'p) data has
yielded precise values of the spectroscopic factor for 1p-shell and 1s-shell
knockout from 12C. These values have been used to evaluate the transparency of
the 12C nucleus for 1p-shell and 1s-shell protons separately on the basis of
recent high-energy 12C(e,e'p) data taken at a four-momentum transfer squared of
1.1 GeV/c^2. As the resulting average value of the nuclear transparency,
0.81(0.04), is considerably higher than the value obtained from previous
analyses and theoretical estimates, the high Q^2 data were used instead for an
independent determination of the spectroscopic strength for 1p + 1s knockout.
Combining these results with the low Q^2 data the spectroscopic factors appear
to be momentum-transfer dependent. Possible explanations of these surprising
results in terms of reaction-mechanism effects or a possible breakdown of the
quasi-particle concept at high Q^2 are discussed as well.


title: Breakup Density in Spectator Fragmentation

abstract:
  Proton-proton correlations and correlations of protons, deuterons and tritons
with alpha particles from spectator decays following 197Au + 197Au collisions
at 1000 MeV per nucleon have been measured with two highly efficient detector
hodoscopes. The constructed correlation functions, interpreted within the
approximation of a simultaneous volume decay, indicate a moderate expansion and
low breakup densities, similar to assumptions made in statistical
multifragmentation models.
  PACS numbers: 25.70.Pq, 21.65.+f, 25.70.Mn, 25.75.Gz


title:
Another look at anomalous J/Psi suppression in Pb+Pb collisions at P/A =
  158 GeV/c

abstract:
  A new data presentation is proposed to consider anomalous $J/\Psi$
suppression in Pb + Pb collisions at $P/A=158$ GeV/c. If the inclusive
differential cross section with respect to a centrality variable is available,
one can plot the yield of J/Psi events per Pb-Pb collision as a function of an
estimated squared impact parameter. Both quantities are raw experimental data
and have a clear physical meaning. As compared to the usual J/Psi over
Drell-Yan ratio, there is a huge gain in statistical accuracy. This
presentation could be applied advantageously to many processes in the field of
nucleus-nucleus collisions at various energies.


title:
Strong fragmentation of low-energy electromagnetic excitation strength
  in $^{117}$Sn

abstract:
  Results of nuclear resonance fluorescence experiments on $^{117}$Sn are
reported. More than 50 $\gamma$ transitions with $E_{\gamma} < 4$ MeV were
detected indicating a strong fragmentation of the electromagnetic excitation
strength. For the first time microscopic calculations making use of a complete
configuration space for low-lying states are performed in heavy odd-mass
spherical nuclei. The theoretical predictions are in good agreement with the
data. It is concluded that although the E1 transitions are the strongest ones
also M1 and E2 decays contribute substantially to the observed spectra. In
contrast to the neighboring even $^{116-124}$Sn, in $^{117}$Sn the $1^-$
component of the two-phonon $[2^+_1 \otimes 3^-_1]$ quintuplet built on top of
the 1/2$^+$ ground state is proved to be strongly fragmented.


title:
Negative heat capacity in the critical region of nuclear fragmentation:
  an experimental evidence of the liquid-gas phase transition

abstract:
  An experimental indication of negative heat capacity in excited nuclear
systems is inferred from the event by event study of energy fluctuations in
$Au$ quasi-projectile sources formed in $Au+Au$ collisions at 35 A.MeV. The
excited source configuration is reconstructed through a calorimetric analysis
of its de-excitation products. Fragment partitions show signs of a critical
behavior at about 5 A.MeV excitation energy. In the same energy range the heat
capacity shows a negative branch providing a direct evidence of a first order
liquid gas phase transition.


title: Light Fragment Yields from Central Au + Au Collisions at 11.5 A GeV/c

abstract:
  Inclusive double differential multiplicities of deuterons, ^3H, ^3He, and
^4He measured by E877 for 11.5 A GeV/c Au+Au collisions at the AGS are
presented. Light fragments at beam-rapidity are measured for the first time at
AGS energies. Beam rapidity deuteron and ^4He yields and transverse slope
parameters are found to be strongly dependent on impact parameter and the shape
of the deuteron spectra is not consistent with that expected for a simple
thermal distribution. The deuteron yields relative to proton yields are
analyzed in terms of a simple coalescence model. While results indicate an
increase in source size compared to collisions of lighter systems at the same
energy, they are inconsistent with a simple coalescence model reflected by a
rapidity dependence of the coalescence parameter B_d. A new approach utilizing
an expanding thermalized source combined with a coalescence code is developed
for studying deuteronformation in heavy-ion collisions. The strong dependence
of deuteron yields on collective motion implies that deuteron yields relative
to those of protons can be used for constraining source parameters.


title:
Two-Proton Correlations near Midrapidity in p+Pb and S+Pb Collisions at
  the CERN SPS

abstract:
  Correlations of two protons emitted near midrapidity in p+Pb collisions at
450 GeV/c and S+Pb collisions at 200A GeV/c are presented, as measured by the
NA44 Experiment. The correlation effect, which arises as a result of final
state interactions and Fermi-Dirac statistics, is related to the space-time
characteristics of proton emission. The measured source sizes are smaller than
the size of the target lead nucleus but larger than the sizes of the
projectiles. A dependence on the collision centrality is observed; the source
size increases with decreasing impact parameter. Proton source sizes near
midrapidity appear to be smaller than those of pions in the same interactions.
Quantitative agreement with the results of RQMD (v1.08) simulations is found
for p+Pb collisions. For S+Pb collisions the measured correlation effect is
somewhat weaker than that predicted by the model simulations, implying either a
larger source size or larger contribution of protons from long-lived particle
decays.


title: Angular momentum sharing in dissipative collisions

abstract:
  Light charged particles emitted by the projectile-like fragment were measured
in the direct and reverse collision of $^{93}$Nb and $^{116}$Sn at 25 AMeV. The
experimental multiplicities of Hydrogen and Helium particles as a function of
the primary mass of the emitting fragment show evidence for a correlation with
net mass transfer. The ratio of Hydrogen and Helium multiplicities points to a
dependence of the angular momentum sharing on the net mass transfer.


title:
The Radiation Tail in (e,e'p) Reactions and Corrections to Experimental
  Data

abstract:
  We present a direct calculation of the cross section for the reaction
3He(e,e'p) including the radiation tail originating from bremsstrahlung
processes. This calculation is compared to measured cross sections. The
calculation is carried out from within a Monte Carlo simulation program so that
acceptance-averaging effects, along with a subset of possible energy losses,
are taken into account. Excellent agreement is obtained between our calculation
and measured data, after a correction factor for higher-order bremsstrahlung is
devised and applied to the tail. Industry-standard radiative corrections fail
miserably for these data, and we use the results of our calculation to dissect
the failure. Implications for design and analysis of experiments in the
Jefferson-Lab energy domain are discussed.


title: Fission Characteristics of Heavy Nuclei: Statics and Dynamics

abstract:
  This paper presents a selective historical perspective of fission research
over the last thirty-five years while Ray Nix has made central contributions to
the field. The emphasis is placed on early studies of the shell stabilized
secondary minimum in the static fission barrier and on the dynamic properties
of fission of hot nuclei, which have recently been the focus of intense study.


title: Reactor Neutrino Physics -- An Update

abstract:
  We review the status and the results of reactor neutrino experiments. Long
baseline oscillation experiments at Palo Verde and Chooz have provided limits
for the oscillation parameters while the recently proposed Kamland experiment
at a baseline of more than 100km is now in the planning stage. We also describe
the status of neutrino magnetic moment experiments at reactors.


title:
Spin Transfer in Exclusive Lambda Production from pp Collisions at 3.67
  GeV/c

abstract:
  We report the first polarization transfer measurements for exclusive hyperon
production reactions. The normal spin transfer coefficient DNN for pp -> p K+
Lambda is large and negative for forward Lambda production at a beam momentum
of 3.67 GeV/c, a result qualitatively consistent with expectations for a
mechanism dominated by kaon-exchange and rescattering. The sign of DNN is
opposite to that observed in the fragmentation regime for inclusive Lambda
production at much higher energies.


title:
Thermal excitation of heavy nuclei with 5-15 GeV/c antiproton, proton
  and pion beams

abstract:
  Excitation-energy distributions have been derived from measurements of
5.0-14.6 GeV/c antiproton, proton and pion reactions with $^{197}$Au target
nuclei, using the ISiS 4$\pi$ detector array. The maximum probability for
producing high excitation-energy events is found for the antiproton beam
relative to other hadrons, $^3$He and $\bar{p}$ beams from LEAR. For protons
and pions, the excitation-energy distributions are nearly independent of hadron
type and beam momentum above about 8 GeV/c. The excitation energy enhancement
for $\bar{p}$ beams and the saturation effect are qualitatively consistent with
intranuclear cascade code predictions. For all systems studied, maximum cluster
sizes are observed for residues with E*/A $\sim$ 6 MeV.


title: Centrality Dependence of Directed and Elliptic Flow at the SPS

abstract:
  New data with a minimum bias trigger for 158 GeV/nucleon Pb + Pb have been
analyzed. Directed and elliptic flow as a function of rapidity of the particles
and centrality of the collision are presented. The centrality dependence of the
ratio of elliptic flow to the initial space elliptic anisotropy is compared to
models.


title: Band termination in the N=Z Odd-Odd Nucleus 46V

abstract:
  High spin states in the odd-odd N=Z nucleus 46V have been identified. At low
spin, the T=1 isobaric analogue states of 46Ti are established up to I = 6+.
Other high spin states, including the band terminating state, are tentatively
assigned to the same T=1 band. The T=0 band built on the low-lying 3+ isomer is
observed up to the 1f7/2-shell termination at I=15. Both signatures of a
negative parity T=0 band are observed up to the terminating states at I = 16-
and I = 17-, respectively. The structure of this band is interpreted as a
particle-hole excitation from the 1d3/2 shell. Spherical shell model
calculations are found to be in excellent agreement with the experimental
results.


title:
Mass dependence of light nucleus production in ultrarelativistic heavy
  ion collisions

abstract:
  Light nuclei can be produced in the central reaction zone via coalescence in
relativistic heavy ion collisions. E864 at BNL has measured the production of
ten light nuclei with nuclear number of A=1 to A=7 at rapidity $y\simeq1.9$ and
$p_{T}/A\leq300MeV/c$. Data were taken with a Au beam of momentum of 11.5 A
$GeV/c$ on a Pb or Pt target with different experimental settings. The
invariant yields show a striking exponential dependence on nuclear number with
a penalty factor of about 50 per additional nucleon. Detailed analysis reveals
that the production may depend on the spin factor of the nucleus and the
nuclear binding energy as well.


title:
Coupled-channels analysis of the $^{{\bf 16}}$O+$^{{\bf 208}}$Pb fusion
  barrier distribution

abstract:
  Analyses using simplified coupled-channels models have been unable to
describe the shape of the previously measured fusion barrier distribution for
the doubly magic $^{16}$O+$^{208}$Pb system. This problem was investigated by
re-measuring the fission excitation function for $^{16}$O+$^{208}$Pb with
improved accuracy and performing more exact coupled-channels calculations,
avoiding the constant-coupling and first-order coupling approximations often
used in simplified analyses. Couplings to the single- and 2-phonon states of
$^{208}$Pb, correctly taking into account the excitation energy and the phonon
character of these states, particle transfers, and the effects of varying the
diffuseness of the nuclear potential, were all explored. However, in contrast
to other recent analyses of precise fusion data, no satisfactory simultaneous
description of the shape of the experimental barrier distribution and the
fusion cross-sections for $^{16}$O+$^{208}$Pb was obtained.


title: Resilient Reducibility in Nuclear Multifragmentation

abstract:
  The resilience to averaging over an initial energy distribution of
reducibility and thermal scaling observed in nuclear multifragmentation is
studied. Poissonian reducibility and the associated thermal scaling of the mean
are shown to be robust. Binomial reducibility and thermal scaling of the
elementary probability are robust under a broad range of conditions. The
experimental data do not show any indication of deviation due to averaging.


title: Directed and Elliptic Flow in 158 AGeV Pb+Pb Collisions

abstract:
  Directed and elliptic flow of protons and positively charged pions has been
studied in the target fragmentation region using the Plastic Ball detector in
the WA98 experiment. The results exhibit a strong dependence on centrality,
rapidity, and transverse momentum.
  The rapidity dependence can be described by a Gaussian distribution. The
model comparisons reveal a large discrepancy of the flow strength obtained from
the data and the simulations.


title: Recent results from E877 for Au+Au collisions at AGS energy

abstract:
  The E877 experiment was dedicated to the study of hadron distributions in
Au+Au collisions at the AGS. Here, we will mainly present results from the
analysis of the data obtained from the last data taking run, which took place
in the fall of 1995 and recorded 46 millions Au+Au events at 11.5 AGeV/c. The
improved experimental apparatus and large statistics allowed to extend our
previous measurements of particle flow to K^+, K^-, pbar and lambda. We will
also report our latest results on two-particle correlations of like and unlike
particles, as well as the measurements of double differential multiplicities of
lambda-hyperons.


title: E864: Experimental Results on Exotic Nuclei and Rare Probes

abstract:
  Experiment 864 at the BNL-AGS was designed to search for exotic states of
strange quark matter and other rare composite particles. The experiment was
commissioned in 1994 and completed its final run in 1998. Here, we present an
overview of the experimental results for the production of light nuclei up to
A=7, antiprotons and antideuterons, hypernuclei and production limits on new
states of quark matter.


title: Essay on the gamma ray laser

abstract:
  This work discusses the possibility of inducing the emission of gamma
radiation from nuclear isomers by two-photon transitions, in the more general
context of the problem of the amplification of gamma radiation.


title: Experimental conditions for the gamma optical scattering

abstract:
  This work discusses the possibility of observation of nuclear multiphoton
processes in which the interaction of a gamma ray photon with a nucleus takes
place simultaneously with the interaction of a radio-frequency photon.


title: Amplification of Gamma Radiation from X-Ray Excited Nuclear States

abstract:
  In this paper we discuss the possibility of the excitation of nuclear
electromagnetic transitions by the absorption of X-ray quanta produced in
appropriate inner-shell atomic transitions, and the relevance of this process
for the amplification of the gamma radiation from the excited nuclear states.
It is concluded that the X-ray pumping technique might provide a useful
approach for the development of a gamma ray laser.


title:
Parameters of Fermi-motion from Quasielastic Backward Pion-Proton
  Scattering on Nuclei

abstract:
  In experiment on the study of the quasielastic pion-proton scattering at
large momentum transfer on nuclei the proton Fermi-momentum distributions have
been analysed in plane-wave approximation for light nuclei $^6$Li, $^7$Li and
$^{12}$C. It was found that, contrary to (e,e') experiments, that the
oscillator model gives slightly better description of our data than the Fermi -
gas model. But the values of parameters of the distributions obtained in our
analysis are considerably smaller, than in (e,e') experiments. It gives
evidence that the plane-wave approximation is not sufficient and more
complicated theoretical models which take into account the effects of
distortion of pion-nucleon amplitude in a nuclear medium are necessary for
analysis of our data.


title:
The Charge Form Factor of the Neutron from the Reaction
  \pol{2H}(\pol{e},e'n)p

abstract:
  We report on the first measurement of spin-correlation parameters in
quasifree electron scattering from vector-polarized deuterium. Polarized
electrons were injected into an electron storage ring at a beam energy of
720~MeV. A Siberian snake was employed to preserve longitudinal polarization at
the interaction point. Vector-polarized deuterium was produced by an atomic
beam source and injected into an open-ended cylindrical cell, internal to the
electron storage ring. The spin correlation parameter A^V_{ed} was measured for
the reaction \pol{2H}(\pol{e},e'n)p at a four-momentum transfer squared of 0.21
(GeV/c)^2 from which a value for the charge form factor of the neutron was
extracted.


title: Strange Meson Enhancement in PbPb Collisions

abstract:
  The NA44 Collaboration has measured yields and differential distributions of
K+, K-, pi+, pi- in transverse kinetic energy and rapidity, around the
center-of-mass rapidity in 158 A GeV/c Pb+Pb collisions at the CERN SPS. A
considerable enhancement of K+ production per pi is observed, as compared to
p+p collisions at this energy. To illustrate the importance of secondary hadron
rescattering as an enhancement mechanism, we compare strangeness production at
the SPS and AGS with predictions of the transport model RQMD.


title:
Transition Rates between Mixed Symmetry States: First Measurement in
  94Mo

abstract:
  The nucleus 94Mo was investigated using a powerful combination of
gamma-singles photon scattering experiments and gamma-gamma-coincidence studies
following the beta-decay of 94mTc. The data survey short-lived J^pi=1+,2+
states and include branching ratios, E2/M1 mixing ratios, lifetimes, and
transition strengths. The mixed-symmetry (MS) 1+ scissors mode and the 2+ MS
state are identified from M1 strengths. A gamma transition between MS states
was observed and its rate was measured. Nine M1 and E2 strengths involving MS
states agree with the O(6) limit of the interacting boson model-2 using the
proton boson E2 charge as the only free parameter.


title: Compositional Studies of Ancient Copper from Romanian Territories

abstract:
  Ancient copper objects from Romanian Territories have been analyzed by
neutron activation analysis. A series of elements is determined: Au, Ag, As,
Co, Cr, Fe, Hg, Ni, Zn, Sb, Sc, Se, Sn. Using mathematical dendograms some
classifications and correlation have been established.


title: Spin Correlation Coefficients in pp-->pnpi+ from 325 to 400 MeV

abstract:
  The spin correlation coefficient combinations Axx + Ayy, Axx - Ayy and the
analyzing powers Ay(theta) were measured for pp-->pnpi+ at beam energies of
325, 350, 375 and 400 MeV. A polarized internal atomic hydrogen target and a
stored, polarized proton beam were used. These polarization observables are
sensitive to contributions of higher partial waves. A comparison with recent
theoretical calculations is provided.


title: Measurement of Partial-Wave Contributions in pp --> pp pi^0

abstract:
  We report a measurement of the spin-dependent total cross section ratios
delta_sigma_T/sigma_tot and delta_sigma_L/sigma_tot of the pp --> pp pi^0
reaction between 325 MeV and 400 MeV. The experiment was carried out with a
polarized internal target in a storage ring. Non-vertical beam polarization was
obtained by the use of solenoidal spin rotators. Near threshold, the knowledge
of both spin-dependent total cross sections is sufficient to deduce the
strength of certain participating partial waves, free of any model.


title: Measurement of neutron capture on 50Ti at thermonuclear energies

abstract:
  At the Karlsruhe and Tuebingen 3.75 MV Van de Graaff accelerators the
thermonuclear 50Ti(n,gamma)51Ti(5.8 min) cross section was measured by the fast
cyclic activation technique via the 320.852 and 928.65 keV gamma-ray lines of
the 51Ti-decay. Metallic Ti samples of natural isotopic composition and samples
of TiO2 enriched in 50Ti by 67.53 % were irradiated between two gold foils
which served as capture standards. The capture cross-section was measured at
the neutron energies 25, 30, 52, and 145 keV, respectively. The direct capture
cross section was determined to be 0.387 +/- 0.011 mbarn at 30 keV. We found
evidence for a bound state s-wave resonance with an estimated radiative width
of 0.34 eV which destructively interfers with direct capture. The strength of a
suggested s-wave resonance at 146.8 keV was determined. The present data served
to calculate, in addition to the directly measured Maxwellian averaged capture
cross sections at 25 and 52 keV, an improved stellar 50Ti(n,gamma)51Ti rate in
the thermonuclear energy region from 1 to 250 keV. The new stellar rate leads
at low temperatures to much higher values than the previously recommended rate,
e.g., at kT=8 keV the increase amounts to about 50 %. The new reaction rate
therefore reduces the abundance of 50Ti due to s-processing in AGB stars.


title:
Nuclear transparency and the onset of strong absorption regime in the
  12C+24Mg system

abstract:
  The elastic scattering of 12C+24Mg has been studied by means of a phase-shift
analysis of 21 angular distributions ranging from Elab=16MeV up to Elab=40MeV.
A tri-dimensional plot of the reflection coefficient of the S-matrix as a
function of the angular momentum and the energy shows a well defined region of
energy which separates two regimes: strong absorption for higher energies and
the so called "anomalous transparency regime", recently observed in this system
at low energies. The Argand diagrams of the S-matrix in angular momentum space
also present very contrasting behaviours in the two regions with very rapidly
varying phases in the low energy region, which we associate with a parity
dependent term in the S-matrix directly related to significant coupling to the
elastic transfer of a 12C nucleus.


title: Coherent \pi^\circ photoproduction from ^4He

abstract:
  Differential cross sections and beam asymmetries for coherent \pi^\circ
photoproduction from ^4He in the \Delta energy-range have been measured with
high statistical and systematic precisions using both decay photons for
identifying the process.The experiment was performed at the MAinz MIcrotron
using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon
facility. The differential cross sections are in excellent agreement with
predictions based on the DWIA if an appropriate parametrization of the
\Delta-nuclear interaction is applied. The beam asymmetries are interpreted in
terms of degrees of linear polarization of collimated coherent bremsstrahlung.
The expected increase of the degree of linear polarization with decreasing
collimation angle is confirmed. Agreement with calculations is obtained on a
few-percent level of precision in the maxima of the coherent peaks.


title:
Study of intermediate velocity products in the Ar+Ni collisions between
  52 and 95 A.MeV

abstract:
  Intermediate velocity products in Ar+Ni collisions from 52 to 95 A.MeV are
studied in an experiment performed at the GANIL facility with the 4$\pi$
multidetector INDRA. It is shown that these emissions cannot be explained by
statistical decays of the quasi-projectile and the quasi-target in complete
equilibrium. Three methods are used to isolate and characterize intermediate
velocity products. The total mass of these products increases with the violence
of the collision and reaches a large fraction of the system mass in mid-central
collisions. This mass is found independent of the incident energy, but strongly
dependent on the geometry of the collision. Finally it is shown that the
kinematical characteristics of intermediate velocity products are weakly
dependent on the experimental impact parameter, but strongly dependent on the
incident energy. The observed trends are consistent with a
participant-spectator like scenario or with neck emissions and/or break-up.


title:
Novel rapidity dependence of directed flow in high energy heavy ion
  collisions

abstract:
  For high energy nucleus-nucleus collisions, we show that a combination of
space-momentum correlations characteristic of radial expansion together with
the correlation between the position of a nucleon in the nucleus and its
stopping, results in a very specific rapidity dependence of directed flow: a
reversal of sign in the mid-rapidity region. We support our argument by RQMD
model calculations for Au+Au collisions at $\sqrt s$ = 200 AGeV.


title:
The Charge Form Factor of the Neutron from the reaction
  2H(pol)(e(pol)e'n)p

abstract:
  We report on the first measurement of spin-correlation parameters in
quasifree electron scattering from vector-polarized deuterium. Polarized
electrons were injected into an electron storage ring at a beam energy of 720
MeV. A Siberian snake was employed to preserve longitudinal polarization at the
interaction point. Vector-polarized deuterium was produced by an atomic beam
source and injected into an open-ended cylindrical cell, internal to the
electron storage ring. The spin correlation parameter $A^V_{ed}$ was measured
for the reaction $^2 \vec{\rm H}(\vec e,e^\prime n)p$ at a four-momentum
transfer squared of 0.21~(GeV/$c$)$^2$ from which a value for the charge form
factor of the neutron was extracted.


title: Neutron Electric Form Factor from 3He(pol)(e(pol),e'n)

abstract:
  In a double polarised electron scattering experiment data have been taken
from which $G_E^n$ can be extracted for $Q^2=0.2{GeV}^2/c^2$. We have measured
asymmetries corresponding to the spin-spin correlation functions $A'_x$ and
$A'_z$ and to the target analyzing power $A_y^0$. In order to investigate the
influence of the reaction mechanisms and the different components of the
$^3{He}$ wave function, also the $(e,e'p)$ and $(e,e'd)$ channels have been
measured simultaneously. Some preliminary results are presented.


title:
High-precision Studies of the $^{\bf{3}}$He(e,e$^{\bf{\prime}}$p)
  Reaction at the Quasielastic Peak

abstract:
  Precision studies of the reaction $^{3}$He(e,e$^\prime$p) using the
three-spectrometer facility at the Mainz microtron MAMI are presented. All data
are for quasielastic kinematics at $|\vec{q} | =685$ MeV/c. Absolute cross
sections were measured at three electron kinematics. For the measured missing
momenta range from 10 to 165 MeV/c, no strength is observed for missing
energies higher than 20 MeV. Distorted momentum distributions were extracted
for the two-body breakup and the continuum. The longitudinal and transverse
behavior was studied by measuring the cross section for three photon
polarizations. The longitudinal and transverse nature of the cross sections is
well described by a currently accepted and widely used prescription of the
off-shell electron-nucleon cross-section. The results are compared to modern
three-body calculations and to previous data.


title: Inclusive 2H(3He,t) reaction at 2 GeV

abstract:
  The inclusive 2H(3He,t) reaction has been studied at 2 GeV for energy
transfers up to 500 MeV and scattering angles from 0.25 up to 4 degrees. Data
are well reproduced by a model based on a coupled-channel approach for
describing the NN and N Delta systems. The effect of final state interaction is
important in the low energy part of the spectra. In the delta region, the
cross-section is very sensitive to the effects of Delta-N interaction and Delta
N - NN process. The latter has also a large influence well below the pion
threshold. The calculation underestimates the experimental cross-section
between the quasi-elastic and the delta peaks; this is possibly due to
projectile excitation or purely mesonic exchange currents.


title:
Characterisation of Fourteenth-Century Bell-Casting Pit in Old Town Hall
  Sibiu, Romania

abstract:
  In this work we have made an analytical investigation by neutron activation
analysis and X-ray fluorescence of a number of pieces found on the two hearths
and the slag layer discovered at the Old Town Hall from Sibiu, Romania and some
bells from the surrounding region of Sibiu. The elemental analyses suggest the
fact that the hearths preserve traces of an activity of alloying of copper with
tin for casting bells.


title:
Physics of Ultra-Relativistic Nuclear Collisions with Heavy Beams at LHC
  Energy

abstract:
  We discuss current plans for experiments with ultra-relativistic nuclear
collisions with heavy beams at LHC energy ($\sqrt{s} = 5.5$ TeV/nucleon pair).
Emphasis will be placed on processes which are unique to the LHC program. They
include event-by-event interferometry, complete spectroscopy of the $\Upsilon$
resonances, and open charm and open beauty measurements.


title:
Trace Analysis of Ancient Gold Objects Using Radiochemical Neutron
  Activation

abstract:
  Radiochemical neutron activation analysis has been applied to investigate the
microelements in gold samples with archaeological importance. Chemical
separation has allowed the determination of traces of Ir, Os, Sb, Zn, Co, Fe,
Ni. Instrumental neutron activation analysis has been used for the
determination of Cu.


title: Induced Emission of Gamma Radiation from Isomeric Nuclei

abstract:
  We study the possibility to influence the lifetime of nuclear isomeric states
with the aid of incident fluxes of photons. We assume that a nucleus initially
in an isomeric state |i> first absorbs an incident photon of energy E_{ni} to
reach a higher intermediate state |n>, then the state |n> decays to a lower
state |l>. In favorable cases the two-step induced emission rates become equal
to the natural isomeric decay rates for incident power densities of the order
of 10^{10} W cm^{-2}.


title:
Trace elements analysis of aerosol samples from some Romanian urban
  zones

abstract:
  Aerosols deposits on filters from ten Romanian towns with different kinds and
levels of industrial development have been studied. The concentration of
elements with Z~16 have been measured by particle - induced X-ray emission
(PIXE) analysis. It has been determined 15 elements: S, K, Ca, Ti, V, Cr, Mn,
Fe, Co, Ni, Cu, Zn, As, Hg and Pb.


title: Power densities for two-step gamma-ray transitions from isomeric states

abstract:
  We have calculated the incident photon power density P_2 for which the
two-step induced emission rate from an isomeric nucleus becomes equal to the
natural isomeric decay rate. We have analyzed two-step transitions for isomeric
nuclei with a half-life greater than 10 min, for which there is an intermediate
state of known energy, spin and half-life, for which the intermediate state is
connected by a known gamma-ray transition to the isomeric state and to at least
another intermediate state, and for which the relative intensities of the
transitions to lower states are known. For the isomeric nucleus 166m-Ho, which
has a 1200 y isomeric state at 5.98 keV, we have found a value of P_2=6.3 x
10^7 W cm^{-2}, the intermediate state being the 263.8 keV level. We have found
power densities P_2 of the order of 10^{10} W cm^{-2} for several other
isomeric nuclei.


title:
Experimental and Computer Simulation Study of Radionuclide Production in
  Heavy Materials Irradiated by Intermediate Energy Protons

abstract:
  The results of measurements and computer simulations are presented for the
yields of residual product nuclei in thin targets: U-nat irradiated by 0.1,
0.8, 1.2, and 1.6 GeV and Tc-99 irradiated by 0.2, 0.8, 1.0, 1.4, and 1.6 GeV
protons. The yields were measured at ITEP by direct high-precision gamma
spectrometry. About 820 cross sections are presented and used in comparison
between measured yields and simulations by the LAHET, INUCL, CEM95, HETC,
CASCADE, YIELDX, and ALICE codes.


title:
Analysis of a Cyclotron Based 400 MeV/u Driver System for a Radioactive
  Beam Facility

abstract:
  The creation of intense radioactive beams requires intense and energetic
primary beams. A task force analysis of this subject recommended an
acceleration system capable of 400 MeV/u uranium at 1 particle uA as an
appropriate driver for such a facility. The driver system should be capable of
accelerating lighter ions at higher intensity such that a constant final beam
power (~100kW) is maintained. This document is a more detailed follow on to the
previous analysis of such a system incorporating a cyclotron. The proposed
driver pre-acceleration system consists of an ion source, radio frequency
quadrupole, and linac chain capable of producing a final energy of 30 MeV/u and
a charge (Q) to mass (A) of Q/A ~1/3. This acceleration system would be
followed by a Separated Sector Cyclotron with a final output energy of 400
MeV/u. This system provides a more cost-effective solution in terms of initial
capital investment as well as of operation compared to a fully linac system
with the same primary beam output parameters.


title:
Isospin-tracing: A probe of non-equilibrium in central heavy-ion
  collisions

abstract:
  Four different combinations of $^{96}_{44}$Ru and $^{96}_{40}$Zr nuclei, both
as projectile and target, were investigated at the same bombarding energy of
400$A$ MeV using a $4 \pi$ detector. The degree of isospin mixing between
projectile and target nucleons is mapped across a large portion of the phase
space using two different isospin-tracer observables, the number of measured
protons and the ${\rm t}/^{3}{\rm He}$ yield ratio. The experimental results
show that the global equilibrium is not reached even in the most central
collisions. Quantitative measures of stopping and mixing are extracted from the
data. They are found to exhibit a quite strong sensitivity to the in-medium
(n,n) cross section used in microscopic transport calculations.


title:
Experimental and Computer Simulation Study of Radioactivity of Materials
  Irradiated by Intermediate Energy Protons

abstract:
  The results of measurements and computer simulations of radioactivities and
dose rates as functions of decay time are presented for Pb-nat and Bi-209
irradiated by 1.5-GeV protons, Co-59, Cu-63, and Cu-65 irradiated by 0.13- and
1.2-GeV protons, and Th-232 and U-nat irradiated by 0.1- and 0.8-GeV protons.
The activities and dose rates are measured by direct high-precision gamma
spectrometry. The irradiations were made using external beams extracted from
the ITEP U-10 proton synchrotron. Simulations made using the LCS and CINDER'90
code systems are compared with measurements.


title: An electronic clock for correlated noise corrections

abstract:
  An inexpensive and portable approach to measure the time an experimental
event occurs as measured by a specific electronic clock is presented. The clock
resets in active synchronization with the experimental AC-power cycle. This
allows an efficient and complete correction for correlated noise contributions
to pulse area and time measurements of detector channels equipped with
PhotoMultiplier Tubes. The electronic board that was developed will be
described. The performance for the treatment of correlated noise in
experimental data taken at the BNL-AGS facility, and analyses of spectral
decompositions of this noise, will also be described.


title:
Determination of the E2/M1 Ratio in the \gamma N \to \Delta(1232)
  Transition from a Simultaneous Measurement of p(\vec{\gamma},p)\pi^0 and
  p(\vec{\gamma},\pi^+)n

abstract:
  Tagged linearly polarized photons have been used at the Mainz Microtron MAMI
for simultaneous measurements of the p(\vec{\gamma},p)\pi^0 and
p(\vec{\gamma},\pi^+)n reaction channels to study the \gamma N \to \Delta(1232)
transition. The energy dependence of the magnetic dipole M_{1+}^{3/2} and
electric quadrupole E_{1+}^{3/2} amplitudes have been extracted from these data
in the photon energy range from 270 to 420 MeV. The E2/M1 ratio for the \gamma
N \to \Delta(1232) transition has been determined to be -
(2.5+-0.1_{stat}+-0.2_{sys}) % at the resonance position delta_{33}=90^0.


title:
Analysis by neutron activation analysis a some ancient ceramics from
  Romanian territories

abstract:
  In this paper we have analyzed samples of Neolithic ceramics from
Cucuteni-Scanteia - Vaslui county and Neolithic and Dacian ceramics from
Magurele - Bucharest, by the method of neutron activation analysis. The
following elements have been observed: Fe, K, La, Mn, Na, Sc and Sm. It has
been noticed a relative and a slight clusterization of the analyzed items on
the ratios of concentrations Na/Mn, La/Sc and La/Sm.


title:
Production of Stable and Unstable Nuclei and Hyperfragments in 11.5 A
  GeV/c Au+Pb collisions

abstract:
  We present measurements of the production of stable light nuclei for mass
number A<=7, of strongly decaying states He(5) and Li(5) and of the
hypernucleus H(3,lambda). We also examine trends in the production of these
multibaryon states as a function of kinematic variables and properties of these
states including strangeness content.


title: Analysis by neutron activation analysis a some ancient Dacian ceramics

abstract:
  Ancient Dacian ceramics, from three different establishments from Romanian
territory have been analyzed by neutron activation analysis. A series of
elements has been determined: Ba, Eu, K, La, Mn, Na, Sc, Sm. Ba is the element
that could be considered to differentiate relatively the three groups of
ceramics.


title: Study by the Methods of Physics of some Medieval Coins

abstract:
  A number of medieval coins from the Brukenthal Museum, Sibiu, Romania have
been analyzed by the means of three methods: gamma transmission, X-ray
fluoresecence and neutron activation analysis. The values of the concentrations
of the elements determined given by the three methods are discussed.


title:
Optical model potentials involving loosely bound p-shell nuclei around
  10 MeV/A

abstract:
  We present the results of a search for optical model potentials for use in
the description of elastic scattering and transfer reactions involving stable
and radioactive p-shell nuclei. This was done in connection with our program to
use transfer reactions to obtain data for nuclear astrophysics, in particular
for the determination of the astrophysical S_17 factor for 7Be(p,\gamma)8B
using two (7Be,8B) proton transfer reactions. Elastic scattering was measured
using 7Li, 10B, 13C and 14N projectiles on 9Be and 13C targets at or about
E/A=10 MeV/nucleon. Woods-Saxon type optical model potentials were extracted
and are compared with potentials obtained from a microscopic double folding
model. We use these results to find optical model potentials for unstable
nuclei with emphasis on the reliability of the description they provide for
peripheral proton transfer reactions. We discuss the uncertainty introduced by
the procedure in the prediction of the DWBA cross sections for the (7Be,8B)
reactions used in extracting the astrophysical factor S_17(0).


title: Neutron activation analysis of some Neolithic copper objects

abstract:
  93 items of Neolithic copper from National Museum of History from Bucharest,
with the provenance from Moldavia region have been analyzed by neutron
activation analysis. The results of the analysis provide the values of the
concentrations for the series of the determined elements: Au, Ag, As, Cr, Co,
Fe, Hg, Ni, Sb, Se, Sn and Zn.


title: Initial singlet and triplet spin state contributions to pp -> pp pi0

abstract:
  The PINTEX facility at the IUCF Cooler ring, dedicated to the study of spin
dependence in nucleon-nucleon interactions, has been used to measure
polarization observables of the reaction pp -> pp pi0 at beam energies between
325 and 400 MeV. The stored polarized proton beam had spin projections both in
the longitudinal and the transverse directions with respect to the beam
momentum. We report here on the measurements of the relative transverse and
longitudinal spin-dependent cross sections, deltasigma_T/sigma_tot and
deltasigma_L/sigma_tot, and how from these observables the initial spin singlet
and triplet cross sections are obtained. Considering angular momentum states
less or equal to one, the contribution of the Ps partial waves to the cross
section can be extracted.


title: Measurements of Neutrons in 11.5 A GeV/c Au+Pb Heavy Ion Collisions

abstract:
  We present measurements from Brookhaven Experiment 864 of neutron invariant
multiplicity in 11.5 A GeV/c Au+Pb collisions. The measurements span a rapidity
range from center-of-mass to beam rapidity (y(beam)=3.2) and are presented as a
function of event centrality. The results are compared with E864 measurements
of proton invariant multiplicity and an average n/p ratio at hadronic
freeze-out of 1.19+-.08 is determined for the rapidity range y=1.6 to y=2.4. We
discuss briefly the implications of this ratio within a simple equilibrium
model of the collision system.


title:
Systematic Study of Hadronic Observables in Nucleus Nucleus Collisions
  at CERN SPS

abstract:
  The possible transition of nuclear matter to a deconfined phase in
relativistic nucleus-nucleus collisions is explored by a systematic variation
of the collision system by means of system size, beam energy and centrality of
the collision all measured within the same experiment NA49 at the CERN SPS. The
investigation takes advantage of the large number of hadronic observables
covered over a wide phase space by the acceptance of the NA49 TPCs.


title: A systematic study of two particle correlations from NA49 at CERN SPS

abstract:
  A systematic study of two particle correlations measured by the NA49
experiment is summarized. Radii from Bose Einstein interferometry have been
determined separately in different parts of phase space, for different
collision systems and at different incident beam energies. Moreover, first
results of a new method of accessing space-time asymmetries in the emission of
particles by means of non identical particle correlations are presented.


title:
A statistical interpretation of the correlation between intermediate
  mass fragment multiplicity and transverse energy

abstract:
  Multifragment emission following Xe+Au collisions at 30, 40, 50 and 60 AMeV
has been studied with multidetector systems covering nearly 4-pi in solid
angle. The correlations of both the intermediate mass fragment and light
charged particle multiplicities with the transverse energy are explored. A
comparison is made with results from a similar system, Xe+Bi at 28 AMeV. The
experimental trends are compared to statistical model predictions.


title: Thermalization and Flow in 158 AGeV Pb+Pb Collisions

abstract:
  The WA98 experiment at the CERN SPS measures Pb+Pb Collisions at 158 AGeV.
The scaling properties of the charged particle multiplicity at midrapidity with
the number of participants are studied using the SPMD and the MIRAC detector.
Neutral pion spectra obtained from the LEDA detector are compared to
hydrodynamical parametrizations. The collective flow in the target
fragmentation region has been studied using the Plastic Ball detector. The
results exhibit a strong dependence on centrality and rapidity.


title: Double polarization experiments at intermediate energy

abstract:
  At modern electron accelerators with highly polarized, intense, high duty
factor beams double polarization coincidence experiments became feasible with
good statistical accuracy. The strong potential towards the precise
determination of small nucleon structure quantities is illustrated by two
recent examples from MAMI. The measurement of $G_E^n$ in the quasifree reaction
$D(\vec e, e'\vec n)p$ lead to a new parametrization of $G_E^n$ which is
significantly above the previously preferred one from elastic $e-D$ scattering.
A $p(\vec e, e'\vec p)\pi^0$ experiment at the energy of the $\Delta$ resonance
yields preliminary results for the longitudinal quadrupole mixing. Both
experimental errors and model uncertainties are complementary to unpolarized
measurements.


title:
Measurement of Differences Between J/Psi and Psi' Suppression in p-A
  Collisions

abstract:
  Measurements of the suppression of the yield per nucleon of J/Psi and Psi'
production for 800 GeV/c protons incident on heavy relative to light nuclear
targets have been made with very broad coverage in xF and pT. The observed
suppression is smallest at xF values of 0.25 and below and increases at larger
values of xF. It is also strongest at small pT. Substantial differences between
the Psi' and J/Psi are observed for the first time in p-A collisions. The
suppression for the Psi' is stronger than that for the J/Psi for xF near zero,
but becomes comparable to that for the J/Psi for xF > 0.6.


title:
Cluster Emission of $^8$Be in the $^{28}$Si+$^{12}$C Fusion Reaction at
  Low Temperature

abstract:
  Inclusive as well as exclusive energy spectra of the light charged particles
emitted in the $^{28}$Si ($E_{lab}$=112.6 MeV) + $^{12}$C reaction has been
measured using the {\bf ICARE} multidetector array. The data have been analysed
by statistical-model calculations using a spin-dependent level density
parametrization. The results suggest significant deformation effects at high
spin and cluster emission of $^8$Be.


title:
Vanishing spin alignment : experimental indication of triaxial $\bf
  ^{28}Si + {^{28}Si}$ nuclear molecule

abstract:
  Fragment-fragment-$\gamma$ coincidences have been measured for $\rm ^{28}Si +
{^{28}Si}$ at an energy corresponding to the population of a conjectured
resonance in $^{56}$Ni. Fragment angular distributions as well as $\gamma$-ray
angular correlations indicate that the spin orientations of the outgoing
fragments are perpendicular to the orbital angular momentum. This differs from
the $\rm ^{24}Mg+{^{24}Mg}$ and the $\rm ^{12}C+{^{12}C}$ resonances, and
suggests two oblate $\rm ^{28}Si$ nuclei interacting in an equator-to-equator
molecular configuration.


title:
Parity Violation in Elastic Electron-Proton Scattering and the Proton's
  Strange Magnetic Form Factor

abstract:
  We report a new measurement of the parity-violating asymmetry in elastic
electron scattering from the proton at backward scattering angles. This
asymmetry is sensitive to the strange magnetic form factor of the proton as
well as electroweak axial radiative corrections. The new measurement of A=-4.92
+- 0.61 +- 0.73 ppm provides a significant constraint on these quantities. The
implications for the strange magnetic form factor are discussed in the context
of theoretical estimates for the axial corrections.


title: Critical temperature for quenching of pair correlations

abstract:
  The level density at low spin in the 161,162-Dy and 171,172-Yb nuclei has
been extracted from primary gamma rays. The nuclear heat capacity is deduced
within the framework of the canonical ensemble. The heat capacity exhibits an
S-formed shape as a function of temperature, which is interpreted as a
fingerprint of the phase transition from a strongly correlated to an
uncorrelated phase. The critical temperature for the quenching of pair
correlations is found at Tc=0.50(4) MeV.


title: Production of Light (anti-)Nuclei with E864 at the AGS

abstract:
  Light nuclei can be produced in the central reaction zone via coalescence in
relativistic heavy ion collisions. E864 at BNL has measured the production of
ten stable light nuclei with nuclear number of A=1 to A=7 at rapidity
$y\simeq1.9$ and $p_{T}/A\leq300MeV/c$. Data were taken with a Au beam of
momentum of 11.5 A $GeV/c$ on a Pb or Pt target with different experimental
settings. The invariant yields show a striking exponential dependence on
nuclear number over ten orders of magnitudes with a penalty factor of about 50
per additional nucleon. This penalty factor is used to estimate the strange
quark matter (strangelet) production in the baryon rich and strangeness
enhanced environment. The measurements of the production of antiproton,
antideuteron, hypernuclei ($^{3}_{\Lambda}H$,$^{4}_{\Lambda}H$), and strongly
unstable nuclear states ($^{4}H$,$^{5}Li$, $^{5}Li^{*}$, $^{5}He$) are
presented as well. A model of local thermal equilibrium with radial flow at the
kinetic freeze-out with a temperature of $T=112\pm10MeV$, chemical potential of
$\mu_{B}=503\pm20MeV$ and flow velocity of about
$\sqrt{V_{\perp}^{2}}\simeq0.5c$ seems to be able to describe the data in the
gross scale with the exceptions of the production of antihyperons and
hypernuclei. The large antihyperon production and the extra penalty for
hypernuclei production are quite surprising.


title: Investigation of the Exclusive 3He(e,e'pp) Reaction

abstract:
  Cross sections for the 3He(e,e'pp)n reaction were measured at an energy
transfer of 220 MeV and three-momentum transfers q of 305, 375, and 445 MeV/c.
Results are presented as a function of q and the final-state neutron momentum
for slices in specific kinematic variables. At low neutron momenta, comparison
of the data to results of continuum Faddeev calculations performed with the
Bonn-B nucleon-nucleon potential indicates a dominant role for two-proton
knockout induced by a one-body hadronic current.


title: Towards the Quark Gluon Plasma

abstract:
  We discuss recent experimental results in the field of ultra-relativistic
nuclear collisions. The emerging ``picture'' is a collectively expanding,
initially hot and dense fireball in which strangeness- and low-mass di-lepton
pair production are enhanced and J/$\Psi$ production is suppressed compared to
expectations from nucleon-nucleon collisions. It is argued that, taken
together, these data provide circumstantial evidence that a (at least partly)
partonic phase was produced in such collisions.


title:
Elastic Compton scattering from the deuteron and nucleon
  polarizabilities

abstract:
  Cross sections for elastic Compton scattering from the deuteron were measured
over the laboratory angles 35-150 deg. Tagged photons in the laboratory energy
range 84-105 MeV were scattered from liquid deuterium and detected in the
large-volume Boston University NaI (BUNI) spectrometer. Using the calculations
of Levchuk and L'vov, along with the measured differential cross sections, the
isospin-averaged nucleon polarizabilities in the deuteron were estimated. A
best-fit value of (alpha-beta) = 2.6+/-1.8 was determined, constrained by
dispersion sum rules. This is markedly different from the accepted value for
the proton of (alpha-beta) = 10.0+/-1.5+/-0.9.


title:
Model-independent determination of the 12C(p,p')12C*(15.11 MeV, 1+, T=1)
  transition amplitude at 200 MeV

abstract:
  Using data obtained through simultaneous measurements of (p,p') spin-transfer
observables and (p,p'gamma) coincident spin observables, we have made a
model-independent determination of the complete scattering amplitude for the
15.11 MeV, 1+, T=1 state in 12C at an incident proton energy of 200 MeV, for
four center of mass proton scattering angles ranging from 5.5 to 16.5 degrees.
At each angle, 16 different observables were determined, whereas only 11
independent quantities are required to specify the transition amplitude for
this state. It had been shown previously that the set of observables measured
span the allowed space; hence the system is overdetermined, which allowed us to
extract, in a model-independent fashion, each of the individual spin-operator
amplitudes that characterize the reaction. Additional insight into the physical
mechanisms that drive this transition is obtained by mapping out the
momentum-transfer dependence of these amplitudes. We also compare the
magnitudes and phases determined for each of the spin-operator amplitudes to
the predictions of calculations performed in both relativistic and
nonrelativistic frameworks, and discuss the physics content of these
comparisons.


title:
Contribution of the additional neutral pion production in the reaction
  d(e,pp)X

abstract:
  Recently, we have performed the experiment on studying the pion
electroproduction at photon point on the internal polarized deuterium target at
the VEPP-3 storage ring. For the more complete treatment of the reaction
d(e,pp)X we investigate the reaction channel with an additional neutral pion
production as background to the leading reaction of the single negative pion
production. To study this background process we considered the nucleon pole
mechanism and the two-body mechanism. In the latter mechanism a Delta(1232) and
the pion are produced in one nucleon then the pion is absorbed by other nucleon
producing just one more Delta (1232). The final proton-pion systems come from
the decay of the both Deltas. In this work we have estimated the contribution
of the reaction with additional neutral pion production into the whole yield
for the different polarization states of the deuteron in the kinematic
conditions of the VEPP-3 d(e,pp)X - experiment.


title: Search for DCC in 158A GeV Pb+Pb Collisions

abstract:
  A detailed analysis of the phase space distributions of charged particles and
photons have been carried out using two independent methods. The results
indicate the presence of nonstatistical fluctuations in localized regions of
phase space.


title:
Calculation of the interaction of a neutron spin with an atomic electric
  field

abstract:
  The Thomas-Fermi approximation for an atomic wavefunction is used to
calculate the interaction of a neutron spin with the atomic electric field,
either through motional magnetic (v x E) or possibly electric (due to the
possible existence of a neutron permanent electric dipole moment) couplings.


title:
Elliptic flow of $\eta$ and $\pi^{0}$ Mesons in Heavy-Ion Collisions at
  2 AGeV

abstract:
  Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity
in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca
are studied as a function of the number of projectile-like spectator nucleons.
The observed anisotropy corresponds to a negative elliptic flow signal for
$\eta$ mesons, indicating a preferred emission perpendicular to the reaction
plane. In contrast, only small azimuthal anisotropies are observed for
$\pi^{0}$ mesons. This may indicate that $\eta$ mesons freeze out earlier from
the fire ball than pions.


title:
Anisotropic Azimuthal Distributions of Identified Particles in Au+Au
  Collisions at 11.5A GeV/c

abstract:
  We present new results from the analysis of the E877 data taking run in 1995.
Anisotropy in the azimuthal distribution of produced pions, kaons(K^+, K^-),
lambda and antiprotons in Au+Au collisions at 11.5A GeV, are investigated . The
data are compared with the predictions of the RQMD v2.3 event generator.


title: Proton and Pion Production in Au+Au Collisions at 10.8A GeV/c

abstract:
  We present proton and pion tranverse momentum spectra and rapidity
distributions for Au+Au collisions at 10.8A GeV/c. The proton spectra exhibit
collective transverse flow effects. Evidence of the influence of the Coulomb
interaction from the fireball is found in the pion transverse momentum spectra.
The data are compared with the predictions of the RQMD event generator.


title:
The ratio of proton's electric to magnetic form factors measured by
  polarization transfer

abstract:
  The ratio of the proton's elastic electromagnetic form factors was obtained
by measuring the transverse and longitudinal polarizations of recoiling protons
from the elastic scattering of polarized electrons with unpolarized protons.
The ratio of the electric to magnetic form factor is proportional to the ratio
of the transverse to longitudinal recoil polarizations. The ratio was measured
over a range of four-momentum transfer squared between 0.5 and 3.5 GeV-squared.
Simultaneous measurement of transverse and longitudinal polarizations in a
polarimeter provides good control of the systematic uncertainty. The results
for the ratio of the proton's electric to magnetic form factors show a
systematic decrease with increasing four momentum squared, indicating for the
first time a marked difference in the spatial distribution of charge and
magnetization currents in the proton.


title: Photon production in heavy-ion collisions close to the pion threshold

abstract:
  We report on a measurement of hard photons (Eg>30 MeV) in the reaction Ar+Ca
at 180A MeV at an energy in which photons from the decay of pi0 mesons are
dominating. Simultaneous measurement with the TAPS spectrometer of the photon
spectrum and photon-photon coincidences used for the identification of pi0
enabled the subtraction of pi0 contribution. The resulting photon spectrum
exhibits an exponential shape with an inverse slope of
E0=(53+-0.03(stat)-5+8(syst)) MeV. The photon multiplicity, equal to
(1.21+-0.03(stat)+0.3-0.2(syst))10E0-2, is roughly one order of magnitude
larger than the value extrapolated from existing systematics. This enhancement
of the hard photon production is attributed to a strong increase in the
contribution of secondary np collisions to the total photon yield. We conclude
that, on average, the number of np collisions which contribute to the hard
photon production is 7 times larger than the number of first chance np
collisions in the reaction Ar+Ca at 180A MeV.


title: Can Doubly Strange Dibaryon Resonances be Discovered at RHIC?

abstract:
  The baryon-baryon continuum invariant mass spectrum generated from
relativistic nucleus + nucleus collision data may reveal the existence of
doubly-strange dibaryons not stable against strong decay if they lie within a
few MeV of threshold. Furthermore, since the dominant component of these states
is a superposition of two color-octet clusters which can be produced
intermediately in a color-deconfined quark-gluon plasma (QGP), an enhanced
production of dibaryon resonances could be a signal of QGP formation. A total
of eight, doubly-strange dibaryon states are considered for experimental search
using the STAR detector (Solenoidal Tracker at RHIC) at the new Relativistic
Heavy Ion Collider (RHIC). These states may decay to Lambda-Lambda and/or
proton-Cascade-minus, depending on the resonance energy. STAR's large
acceptance, precision tracking and vertex reconstruction capabilities, and
large data volume capacity, make it an ideal instrument to use for such a
search. Detector performance and analysis sensitivity are studied as a function
of resonance production rate and width for one particular dibaryon which can
directly strong decay to proton-Cascade-minus but not Lambda-Lambda. Results
indicate that such resonances may be discovered using STAR if the resonance
production rates are comparable to coalescence model predictions for dibaryon
bound states.


title:
Excitation Function of K$^+$ and $\pi^+$ Production in Au+Au Reactions
  at 2-10 AGeV

abstract:
  Positive pion and kaon production from Au+Au reactions have been measured as
a function of beam energy over the range 2.0-10.7~AGeV. Both the kaon and the
pion production cross-sections at mid-rapidity are observed to increase
steadily with beam kinetic energy. The ratio of K$^+$ to $\pi^+$ mid-rapidity
yields increases from 0.0271$\pm0.0015\pm0.0014$ at 2.0~AGeV to
0.202$\pm0.005\pm0.010$ at 10.7~AGeV and is larger than the K$^+$/$\pi^+$ ratio
from p+p reactions over the same beam energy region. There is no indication of
an onset of any new production mechanism in heavy-ion reactions in this energy
range beyond rescattering of hadrons.


title:
Extraction of level density and gamma strength function from primary
  gamma spectra

abstract:
  We present a new iterative procedure to extract the level density and the
gamma strength function from primary gamma spectra for energies close up to the
neutron binding energy. The procedure is tested on simulated spectra and on
data from the Yb-173(He-3,alpha)Yb-172 reaction.


title: K$^-$ Meson Production in the Proton-Proton Reaction at 3.67 GeV/c

abstract:
  The total cross section of the reaction $pp\to ppK^+K^-$ has been determined
for proton--proton reactions with $p_{beam}=3.67 GeV/c$. This represents the
first cross section measurement of the $pp \to ppK^-K^+$ channel near
threshold, and is equivalent to the inclusive $pp\to ppK^-X$ cross section at
this beam momentum. The cross section determined at this beam momentum is about
a factor 20 lower than that for inclusive $pp\to ppK^+X$ meson production at
the same CM energy above the corresponding threshold. This large difference in
the $K^+$ and $K^-$ meson inclusive production cross sections in proton-proton
reactions is in strong contrast to cross sections measured in sub-threshold
heavy ion collisions, which are similar in magnitude at the same energy per
nucleon below the respective thresholds.


title: The Reaction D(e,pp)e'pi- on Polarized Deuteron at High Proton Momenta

abstract:
  The differential cross section and target asymmetry components of the
reaction D(e,pp)e'pi- on polarized deuteron were measured. The kinetic energies
of the protons were measured within 55-180 MeV and 46-265 MeV. The polar
acceptance angles in laboratory frame for the both protons are (64 - 82)
degrees and the azimuthal angles are (-16 +16), (164 - 196) degrees. The sharp
peak of the tensor a(20)-component of the target asymmetry is found near the
invariant mass of the pppi-system M(pppi) = 2300 MeV/c**2. The performed
calculations of the differential yield and the tensor target asymmetry do not
describe the obtained experimental results.


title: Cross sections of 4He interaction with protons at 5 GeV/c

abstract:
  The total and topological 4Hep cross sections as well as the cross sections
of the separate 4Hep interaction channels and the differential cross sections
of the elastic 4Hep scattering were measured using the 2m hydrogen bubble
chamber exposed to a separated beam of alpha-particles from the ITEP
synchrotron at 5 GeV/c (the kinetic energy of the initial protons in the
nuclear rest frame was 620 MeV). The data obtained have been compared with the
results of the previous experiments and with the theoretical predictions based
on the Glauber-Sitenko multiple-scattering theory.


title: A high-precision polarimeter

abstract:
  We have built a polarimeter in order to measure the electron beam
polarization in hall C at JLAB. Using a superconducting solenoid to drive the
pure-iron target foil into saturation, and a symmetrical setup to detect the
Moller electrons in coincidence, we achieve an accuracy of <1%. This sets a new
standard for Moller polarimeters.


title:
Calculation of the ultracold neutron upscattering rate from
  para-deuterium bound in a lattice

abstract:
  The ultracold neutron (UCN) upscattering rate from para-deuterium
contaminated solid deuterium near T=0K is calculated and found to be 4 msec for
a room-temperature-equilibrium concentration. The para-deuterium contamination
appears to be responsible for the apparent loss of UCN in the Los Alamos
spallation-driven UCN source.


title:
Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained
  with the CERES spectrometer

abstract:
  During the 1996 lead run time, CERES has accumulated 42 million events,
corresponding to a factor of 5 more statistics than in 1995 and 2.5 million
events of a special photon-run. We report on the results of the low-mass
e$^+$e$^-$-pair analysis. Since the most critical item is the poor
signal-to-background ratio we also discuss the understanding of this
background, in absolute terms, with the help of a detailed Monte Carlo
simulation. We show preliminary results of the photon analysis and summarize
the results of the hadron analysis preliminarily reported on already at QM'97


title: The Sudbury Neutrino Observatory

abstract:
  The Sudbury Neutrino Observatory is a second generation water Cherenkov
detector designed to determine whether the currently observed solar neutrino
deficit is a result of neutrino oscillations. The detector is unique in its use
of D2O as a detection medium, permitting it to make a solar model-independent
test of the neutrino oscillation hypothesis by comparison of the charged- and
neutral-current interaction rates. In this paper the physical properties,
construction, and preliminary operation of the Sudbury Neutrino Observatory are
described. Data and predicted operating parameters are provided whenever
possible.

categories: nucl-ex astro-ph hep-ex hep-ph physics.ins-det


title: Thermally-induced expansion in the 8 GeV/c $\pi^-$ + $^{197}$Au reaction

abstract:
  Fragment kinetic energy spectra for reactions induced by 8.0 GeV/c
$\rm{\pi^-}$ beams incident on a $\rm{^{197}}$Au target have been analyzed in
order to deduce the possible existence and influence of thermal expansion. The
average fragment kinetic energies are observed to increase systematically with
fragment charge but are nearly independent of excitation energy. Comparison of
the data with statistical multifragmentation models indicates the onset of
extra collective thermal expansion near an excitation energy of E*/A
$\rm{\approx}$ 5 MeV. However, this effect is weak relative to the radial
expansion observed in heavy-ion-induced reactions, consistent with the
interpretation that the latter expansion may be driven primarily by dynamical
effects such as compression/decompression.


title: Energy shifted level densities in the rare earth region

abstract:
  The density of accessible levels at low spin in the (3-He,alpha gamma)
reaction has been extracted for the 161,162-Dy and 171,172-Yb nuclei. The
energy shift between the level densities of the even-odd and even-even isotopes
is measured as a function of excitation energy. The results are compared with
predictions from various semi-empirical models. The energy shift procedure
works well for excitation energies between 3.5 and 7 MeV in the even-even
nucleus, provided that a proper level density function is used. The
experimental energy shift is close to the pairing gap parameter Delta.


title: Isospin Fractionation in Nuclear Multifragmentation

abstract:
  Isotopic distributions for light particles and intermediate mass fragments
have been measured for 112Sn+112Sn, 112Sn+124Sn, 124Sn+112Sn and 124Sn+124Sn
collisions at E/A=50 MeV. Isotope, isotone and isobar yield ratios are utilized
to obtain an estimate of the isotopic composition of the gas phase, i.e., the
relative abundance of free neutrons and protons at breakup. Within the context
of equilibrium calculations, these analyses indicate that the gas phase is
enriched in neutrons relative to the liquid phase represented by bound nuclei.


title: A Compact Solid State Detector for Small Angle Particle Tracking

abstract:
  MIDAS (MIcrostrip Detector Array System) is a compact silicon tracking
telescope for charged particles emitted at small angles in intermediate energy
photonuclear reactions. It was realized to increase the angular acceptance of
the DAPHNE detector and used in an experimental program to check the
Gerasimov-Drell-Hearn sum rule at the Mainz electron microtron, MAMI. MIDAS
provides a trigger for charged hadrons, p/pi identification and particle
tracking in the region 7 deg < theta < 16 deg. In this paper we present the
main characteristics of MIDAS and its measured performances.


title: An Energy Feedback System for the MIT/Bates Linear Accelerator

abstract:
  We report the development and implementation of an energy feedback system for
the MIT/Bates Linear Accelerator Center. General requirements of the system are
described, as are the specific requirements, features, and components of the
system unique to its implementation at the Bates Laboratory. We demonstrate
that with the system in operation, energy fluctuations correlated with the 60
Hz line voltage and with drifts of thermal origin are reduced by an order of
magnitude.


title:
A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n
  reaction at W=1125 MeV

abstract:
  The reaction p(e,e'pi+)n was measured at the Mainz Microtron MAMI at an
invariant mass of W=1125 MeV and four-momentum transfers of Q^2=0.117, 0.195
and 0.273 (GeV/c)^2. For each value of Q^2, a Rosenbluth separation of the
transverse and longitudinal cross sections was performed. An effective
Lagrangian model was used to extract the `axial mass' from experimental data.
We find a value of M_A=(1.077+-0.039) GeV which is (0.051+-0.044) GeV larger
than the axial mass known from neutrino scattering experiments. This is
consistent with recent calculations in chiral perturbation theory.


title:
Correlation between the charged kaon ratio and the baryon phase-space
  density in heavy-ion collisions

abstract:
  It is found that the baryon phase-space density obtained from the ratio of
deuteron to proton yields is nearly constant over centrality in Au+Au
collisions at the AGS. The finding offers an explanation for the puzzling
centrality independence of the ratio of charged kaon total yields. The
correlation between the charged kaon ratio and the average baryon phase-space
density is studied for central heavy-ion collisions of various systems over a
wide range of beam energy. It is found that the charged kaon ratio and the
average baryon phase-space density both increase with decreasing beam energy,
and are strongly correlated. Such study may provide a new approach to search
for medium effect on the kaon mass.


title:
The Longitudinal and Transverse Response of the 4He(e,e'p) Reaction in
  the Dip Region

abstract:
  A high-resolution study of the (e,e'p) reaction on Helium-4 was carried out
at the Institut fuer Kernphysik in Mainz, Germany. The measurements were done
in parallel kinematics (momentum transfer q=685 MeV/c, energy transfer
omega=334 MeV) at different incident beam energies in order to enable the
Rosenbluth separation of the longitudinal and transverse response functions.


title: Modified Empirical Parametrization of Fragmentation Cross Sections

abstract:
  New experimental data obtained mainly at the GSI/FRS facility allow to modify
the empirical parametrization of fragmentation cross sections, EPAX. It will be
shown that minor modifications of the parameters lead to a much better
reproduction of measured cross sections. The most significant changes refer to
the description of fragmentation yields close to the projectile and of the
memory effect of neutron-deficient projectiles.


title:
Nuclear and Coulomb Interaction in the 8B to 7Be + p Breakup Reaction at
  sub-Coulomb Energies

abstract:
  The angular distribution for the breakup of 8B into 7Be+p on a 58Ni target
has been measured at an incident energy of 25.75 MeV. The data are inconsistent
with first-order theories but are remarkably well described by calculations
including higher-order effects. The comparison with theory illustrates the
importance of the exotic proton halo structure of 8B in accounting for the
observed breakup angular distribution.


title:
Spectroscopy of Double-Beta and Inverse-Beta Decays from 100Mo for
  Neutrinos

abstract:
  Spectroscopic studies of two beta-rays from 100Mo are shown to be of
potential interest for investigating both the Majorana neutrino mass by
neutrinoless double beta-decay and low energy solar neutrino's by inverse
beta-decay. With a multi-ton 100Mo detector, coincidence studies of correlated
beta-beta from neutrinoless double beta-decay, together with the large Q value,
permit identification of the neutrino-mass term with a sensitivity of ~ 0.03
eV. Correlation studies of the inverse beta and the successive beta-decay of
100Tc, together with the large capture rates for low energy solar neutrino's,
make it possible to detect in realtime individual low energy solar neutrino in
the same detector.


title: Two Proton Emission in the Hyperspheric Harmonics Approach

abstract:
  Nuclear decays into three-particle channels are considered in a few-body
approach of hyperspherical harmonics with emphasis on simultaneous, or direct,
emission of two protons. General conditions of direct decays are described and
their main features, being experimentally established in decays of light
nuclei, are reported. The analysis method based on an expansion of decay
amplitude into a series of hyperspherical harmonics is reviewed. The basis of
hyperspherical harmonics functions is a generalisation of the spherical
function basis in three-body systems. The method is tested on analysis of the
direct 2p-decay of Be^6 where the three-body components in the nuclear
structure of Be^6 have been studied. In particular, the observed strong
proton-proton correlations are treated as a manifestation of a specific
three-body quantum effect: the kinematic focusing of fragments over momenta and
in space. The hyperspherical harmonics method is applied for the predictions of
proton-proton correlations and life-time estimates of the nuclei Mg^19, Ca^34
and Ni^48 - candidates for two-proton radioactivity. Each direct 2p-decay
should result in a set of peaks in the E_(p-p) spectrum whose number and
positions depend on the structure of initial nucleus, opposite to the diproton
model, predicting the He^2 emission with one peak at E_(p-p)~0 in all cases.


title:
Transfer/Breakup Modes in the 6He+209Bi Reaction Near and Below the
  Coulomb Barrier

abstract:
  Reaction products from the interaction of 6He with 209Bi have been measured
at energies near the Coulomb barrier. A 4He group of remarkable intensity,
which dominates the total reaction cross section, has been observed. The
angular distribution of the group suggests that it results primarily from a
direct nuclear process. It is likely that this transfer/breakup channel is the
doorway state that accounts for the previously observed large sub-barrier
fusion enhancement in this system.


title: Entropy in hot ^{161,162}Dy and ^{171,172}Yb nuclei

abstract:
  The density of accessible levels at low spin in the (^3He,\alpha \gamma)
reaction has been extracted for the ^{161,162}Dy and ^{171,172}Yb nuclei. The
entropy of the even-odd and even-even nuclei has been deduced as a function of
excitation energy, and found to reach a maximum of 15 k_B before neutron
evaporation. The entropy of one quasi-particle outside an even-even core is
found to be 1.70(15) k_B. This quasi-particle picture of hot nuclei is well
accounted for within a simple pairing model. The onset of two, four and six
quasi-particle excitations in the ^{162}Dy and ^{172}Yb nuclei is discussed and
compared to theory. The number of quasi-particles excited per excitation energy
is a measure for the ratio of the level energy spacing and the pairing
strength.