title:
Isoscalar dipole strength in ^{208}_{82}Pb_{126}: the spurious mode and
  the strength in the continuum

abstract:
  Isoscalar dipole (compression) mode is studied first using schematic
harmonic-oscillator model and, then, the self-consistent Hartree-Fock (HF) and
random phase approximation (RPA) solved in coordinate space. Taking ^{208}Pb
and the SkM* interaction as a numerical example, the spurious component and the
strength in the continuum are carefully examined using the sum rules. It is
pointed out that in the continuum calculation one has to use an extremely fine
radial mesh in HF and RPA in order to separate, with good accuracy, the
spurious component from intrinsic excitations.


title:
The Role of Surface Entropy in Statistical Emission of Massive Fragments
  from Equilibrated Nuclear Systems

abstract:
  Statistical fragment emission from excited nuclear systems is studied within
the framework of a schematic Fermi-gas model combined with Weisskopf's detailed
balance approach. The formalism considers thermal expansion of finite nuclear
systems and pays special attention to the role of the diffuse surface region in
the decay of hot equilibrated systems. It is found that with increasing
excitation energy, effects of surface entropy lead to a systematic and
significant reduction of effective emission barriers for fragments and,
eventually, to the vanishing of these barriers. The formalism provides a
natural explanation for the occurrence of negative nuclear heat capacities
reported in the literature. It also accounts for the observed linearity of
pseudo-Arrhenius plots of the logarithm of the fragment emission probability
{\it versus} the inverse square-root of the excitation energy, but does not
predict true Arrhenius behavior of these emission probabilities.


title:
The Structure of Light Nuclei and Its Effect on Precise Atomic
  Measurements

abstract:
  My talk will consist of three parts: (a) what every atomic physicist needs to
know about the physics of light nuclei [and no more]; (b) what nuclear
physicists can do for atomic physics; (c) what atomic physicists can do for
nuclear physics. A brief qualitative overview of the nuclear force and
calculational techniques for light nuclei will be presented, with an emphasis
on debunking myths and on recent progress in the field. Nuclear quantities that
affect precise atomic measurements will be discussed, together with their
current theoretical and experimental status. The final topic will be a
discussion of those atomic measurements that would be useful to nuclear
physics.


title:
Vector meson production and nucleon resonance analysis in a
  coupled-channel approach for energies m_N < sqrt(s) < 2 GeV I: pion-induced
  results and hadronic parameters

abstract:
  We present a nucleon resonance analysis by simultaneously considering all
pion- and photon-induced experimental data on the final states gamma N, pi N, 2
pi N, eta N, K Lambda, K Sigma, and omega N for energies from the nucleon mass
up to sqrt(s) = 2 GeV. In this analysis we find strong evidence for the
resonances P_{31}(1750), P_{13}(1900), P_{33}(1920), and D_{13}(1950). The
omega N production mechanism is dominated by large P_{11}(1710) and
P_{13}(1900) contributions. In this first part, we present the results of the
pion-induced reactions and the extracted resonance and background properties
with emphasis on the difference between global and purely hadronic fits.


title:
Constraining URCA cooling of neutron stars from the neutron radius of
  208Pb

abstract:
  Recent observations by the Chandra observatory suggest that some neutron
stars may cool rapidly, perhaps by the direct URCA process which requires a
high proton fraction. The proton fraction is determined by the nuclear symmetry
energy whose density dependence may be constrained by measuring the neutron
radius of a heavy nucleus, such as 208Pb. Such a measurement is necessary for a
reliable extrapolation of the proton fraction to the higher densities present
in the neutron star. A large neutron radius in 208Pb implies a stiff symmetry
energy that grows rapidly with density, thereby favoring a high proton fraction
and allowing direct URCA cooling. Predictions for the neutron radius in 208Pb
are correlated to the proton fraction in dense matter by using a variety of
relativistic effective field-theory models. Models that predict a neutron (Rn)
minus proton (Rp) root-mean-square radius in 208Pb to be Rn-Rp<0.20 fm have
proton fractions too small to allow the direct URCA cooling of 1.4 solar-mass
neutron stars. Conversely, if Rn-Rp>0.25 fm, the direct URCA process is allowed
(by all models) to cool down a 1.4 solar-mass neutron star. The Parity Radius
Experiment at Jefferson Laboratory aims to measure the neutron radius in 208Pb
accurately and model independently via parity-violating electron scattering.
Such a measurement would greatly enhance our ability to either confirm or
dismiss the direct URCA cooling of neutron stars.


title: Dynamical nature of the nuclear pseudospin and its isospin asymmetry

abstract:
  Pseudospin symmetry in nuclei is investigated by solving the Dirac equation
with Woods-Saxon scalar and vector radial potentials. We relate the pseudospin
interaction with a pseudospin-orbit term in a Schroedinger-like equation for
the lower component of the Dirac spinor. We show that this term gives a large
contribution to the energy splittings of pseudospin partners, so that the near
pseudospin degeneracy arises from a significant cancellation among the
different terms in that equation. This is a manifestation of the dynamical
character of this symmetry in the nucleus. We analyze the isospin dependence of
the pseudospin symmetry in a nuclear isotope chain by including a
vector-isovector potential V_rho and a Coulomb potential and conclude that
V_rho gives the main contribution to the observed pseudospin isospin asymmetry.


title:
Vector meson production and nucleon resonance analysis in a
  coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II:
  photon-induced results

abstract:
  We present a nucleon resonance analysis by simultaneously considering all
pion- and photon-induced experimental data on the final states gamma N, pi N, 2
pi N, eta N, K Lambda, K Sigma, and omega N for energies from the nucleon mass
up to sqrt(s) = 2 GeV. In this analysis we find strong evidence for the
resonances P_{31}(1750), P_{13}(1900), P_{33}(1920), and D_{13}(1950). The
omega N production mechanism is dominated by large P_{11}(1710) and
P_{13}(1900) contributions. In this second part we present the results on the
photoproduction reactions and the electromagnetic properties of the resonances.
The inclusion of all important final states up to sqrt(s) = 2 GeV allows for
estimates on the importance of the individual states for the GDH sum rule.


title:
Omega meson propagation in dense nuclear matter and collective
  excitations

abstract:
  The bosonic excitations induced by the omega meson propagation in dense
nuclear matter is studied within the framework of random phase approximation.
The collective modes are then analyzed by finding the zeros of the relevant
dielectric functions. Subsequently we present closed form analytical
expressions for the dispersion relations in different kinematical regime. Next,
the analytical behaviour of the in-medium effective propagator for the omega
meson is examined. This is exploited to calculate the full spectral function
for the transverse (T) and longitudinal (L) mode of the omega meson. In
addition, various sum rules are constructed for the omega meson spectral
density in nuclear medium. Results are then discussed by calculating residues
at the poles and discontinuities across the cuts.


title: Stability of strangelet at finite temperature

abstract:
  Using the quark mass density- and temperature dependent model, we have
studied the thermodynamical properties and the stability of strangelet at
finite temperature. The temperature, charge and strangeness dependences on the
stability of strangelet are investigated. We find that the stable strangelets
are only occured in the high strangeness and high negative charge region.


title:
Near threshold neutral pion electroproduction on deuterium in chiral
  perturbation theory

abstract:
  Near threshold neutral pion electroproduction on the deuteron is studied in
the framework of baryon chiral perturbation theory at next-to-leading order in
the chiral expansion. We develop the multipole decomposition for pion
production off spin-1 particles appropriate for the threshold region. The
existing data at photon virtuality k^2 = -0.1 GeV^2 can be described
satisfactorily. Furthermore, the prediction for the S-wave multipole E_d at the
photon point is in good agreement with the data.


title: Three-boson relativistic bound states with zero-range interaction

abstract:
  For the zero-range interaction providing a given mass M_2 of the two-body
bound state, the mass M_3 of the relativistic three-boson state is calculated.
We have found that the three-body system exists only when M_2 is greater than a
critical value M_c approximately 1.43 m (m is the constituent mass). For
M_2=M_c the mass M_3 turns into zero and for M_2<M_c there is no solution with
real value of M_3.


title:
The freeze-out mechanism and phase-space density in ultrarelativistic
  heavy-ion collisions

abstract:
  We explore the consequences of a freeze-out criterion for heavy-ion
collisions, based on pion escape probabilities from the hot and dense but
rapidly expanding collision region. The influence of the expansion and the
scattering rate on the escape probability is studied. The temperature
dependence of this scattering rate favors a low freeze-out temperature of ~100
MeV. In general, our results support freeze-out along finite four-volumes
rather than sharp three-dimensional hypersurfaces, with high-pt particles
decoupling earlier from smaller volumes. We compare our approach to the
proposed universal freeze-out criteria using the pion phase-space density and
its mean free path.


title: Explicitly covariant light-front dynamics and some its applications

abstract:
  The light-front dynamics is an efficient approach to study of field theory
and of relativistic composite systems (nuclei at relativistic relative nucleon
momenta, hadrons in the quark models). The explicitly covariant version of this
approach is briefly reviewed and illustrated by some applications.


title:
The T=0 neutron-proton pairing correlations in the superdeformed
  rotational bands around 60Zn

abstract:
  The superdeformed bands in 58Cu, 59Cu, 60Zn, and 61Zn are analyzed within the
frameworks of the Skyrme-Hartree-Fock as well as Strutinsky-Woods-Saxon total
routhian surface methods with and without the T=1 pairing correlations. It is
shown that a consistent description within these standard approaches cannot be
achieved. A T=0 neutron-proton pairing configuration mixing of
signature-separated bands in 60Zn is suggested as a possible solution to the
problem.


abstract:
  $\Lambda^+_c$- and $\Lambda_b$-hypernuclei are studied in the quark-meson
coupling (QMC) model. Comparisons are made with the results for
$\Lambda$-hypernuclei studied in the same model previously. Although the scalar
and vector potentials felt by the $\Lambda$, $\Lambda_c^+$ and $\Lambda_b$ in
the corresponding hypernuclei multiplet which has the same baryon numbers are
quite similar, the wave functions obtained, e.g., for $1s_{1/2}$ state, are
very different. The $\Lambda^+_c$ baryon density distribution in
$^{209}_{\Lambda^+_c}$Pb is much more pushed away from the center than that for
the $\Lambda$ in $^{209}_\Lambda$Pb due to the Coulomb force. On the contrary,
the $\Lambda_b$ baryon density distributions in $\Lambda_b$-hypernuclei are
much larger near the origin than those for the $\Lambda$ in the corresponding
$\Lambda$-hypernuclei due to its heavy mass. It is also found that level
spacing for the $\Lambda_b$ single-particle energies is much smaller than that
for the $\Lambda$ and $\Lambda^+_c$.


title:
On the asymmetry of Gamow-Teller beta-decay rates in mirror nuclei in
  relation with second-class currents

abstract:
  The theoretical evaluation of major nuclear structure effects on the
asymmetry of allowed Gamow-Teller beta-decay rates in light mirror nuclei is
presented. The calculations are performed within the shell model, using
empirical isospin-nonconserving interaction and realistic Woods-Saxon radial
wave functions. The revised treatment of p-shell nuclei is supplemented by
systematic calculations for sd-shell nuclei and compared to experimental
asymmetries when available. The results are important in connection with the
possible existence of second-class currents in the weak interaction.


title:
Coherent phi and omega meson photoproduction from deuteron and
  non-diffractive channels

abstract:
  For coherent photoproduction of phi and omega mesons from deuteron at forward
angles, the isovector pi-exchange amplitude is strongly suppressed.
  We show a possibility to study the non-diffractive channels associated with
the unnatural parity exchange in phi-photoproduction and with the baryon
resonance excitations in omega-photoproduction by measuring the spin
observables.


title: Pairing-correlations and particle-number projection methods

abstract:
  A systematic study of the pairing-correlations derived from various
particle-number projection methods is performed in an exactly soluble
cranked-deformed shell model Hamiltonian. It is shown that most of the
approximate particle-number projection methods including the method of
Lipkin-Nogami, which is used quite extensively in nuclear structure studies,
breakdown in the weak pairing limit. The results obtained from the recently
formulated number-projected Hartree-Fock-Bogoliubov (PHFB) equations, on the
other hand, are in complete agreement with the exact solutions of the model
Hamiltonian. The pairing-energy calculated from PHFB method is shown to be
finite in all the studied limits. More importantly, the numerical work involved
in the solution of the PHFB equations appears to be comparable to the solution
of the bare HFB equations.


title:
Y-Scaling Analysis of the Deuteron Within the Light-Front Dynamics
  Method

abstract:
  The concept of relativistic scaling is applied to describe the most recent
data from inclusive electron-deuteron scattering at large momentum transfer. We
calculate the asymptotic scaling function f(y) of the deuteron using its
relationship with the nucleon momentum distribution. The latter is obtained in
the framework of the relativistic light-front dynamics (LFD) method, in which
the deuteron is described by six invariant functions f_{i} (i=1,...,6) instead
of two (S and D waves) in the nonrelativistic case. Comparison of the LFD
asymptotic scaling function with other calculations using $S$ and $D$ waves
corresponding to various nucleon-nucleon potentials, as well as with the
Bethe-Salpeter result is made. It is shown that for |y|> 400 MeV/c the
differences between the LFD and the nonrelativistic scaling functions become
larger.


title: Nuclear absorption and anomalous J/psi suppression in Pb+Pb collisions

abstract:
  We have studied the J/psi suppression in 158 GeV/c Pb+Pb collisions at CERN
SPS. J/psi production is assumed to be a two step process, (i) formation of c
bar{c} pair, which is accurately calculable in QCD and (ii) formation of J/psi
meson from the c bar{c} pair, which can be conveniently parameterized. In a
pA/AA collision, as the c bar{c} pair pass through the nuclear medium, it gains
relative square momentum. As a result, some of the c bar{c} pairs can gain
enough momentum to cross the threshold to become open charm meson, leading to
suppression in pA/AA collisions. The model without any free parameter could
describe the of NA50 data on centrality dependence of the ratio's; J/psi over
Drell-Yan, J/psi over minimum bias and also the Drell-Yan over minimum bias.
The model was used to predict J/psi suppression at RHIC energy. At RHIC energy,
hard processes may be important. With hard processes included, J/psi's are
strongly suppressed, in agreement with other model calculations. We also show
that centrality dependence of J/psi over minimum bias ratio can be used to
determine the fraction of hard processes in the collision.


title:
Realistic shell-model calculations for proton particle-neutron hole
  nuclei around 132Sn

abstract:
  We have performed shell-model calculations for nuclei with proton particles
and neutron holes around 132Sn using a realistic effective interaction derived
from the CD-Bonn nucleon-nucleon potential. For the proton-neutron channel this
is explicitly done in the particle-hole formalism. The calculated results are
compared with the available experimental data, particular attention being
focused on the proton particle-neutron hole multiplets. A very good agreement
is obtained for all the four nuclei considered, 132Sb, 130Sb, 133Te and 131Sb.
We predict many low-energy states which have no experimental counterpart. This
may stimulate, and be helpful to, future experiments.


title:
The hypernuclear Auger effect within the density dependent relativistic
  hadron field theory

abstract:
  The hypernuclear Auger effect, given by the de-excitation of a Lambda
hypernucleus by means of the transition of a Lambda hyperon from an initial to
a lower lying final single particle state in conjunction with neutron emission
from the core nucleus is studied in relativistic DDRH field theory. Baryonic
interactions are obtained from the Bonn NN potential by Dirac-Brueckner theory
and theoretically derived scaling laws for the meson-hyperon vertices. The
model is applied to the ^{209}_Lambda Pb hypernucleus. Lambda and nucleon bound
states as well as scattering states are calculated self-consistently in
mean-field approximation. The Auger spectra of the emitted neutrons are of
complex structure due to a huge combinatorial number of possible hypernuclear
transitions. The sensitivity of the neutron Auger spectra to changes in the
Lambda sigma and Lambda omega vertices are investigated. The theoretical
results show that experimental applications of the hypernuclear Auger effect
will require special efforts, e.g. by tagging on the energy of the initially
created hyperon.


title: High-density \={K} nuclear systems with isovector deformation

abstract:
  Using a phenomenological \={K}N potential which reproduces $\Lambda$(1405) as
an I=0 bound state of \={K}N, we investigated deeply bound kaonic nuclei,
ppnK$^-$ and $^8$BeK$^-$, with the method of Antisymmetrized Molecular
Dynamics. Our calculations show that strongly bound kaonic nuclear systems with
unusual exotic structures are formed around the K$^-$, which attracts the
surrounding nucleons to an extremely high-density assembly and induces a
proton-neutron separation, ``isovector deformation''.


title: Nucleon-Nucleon Interactions from Effective Field Theory

abstract:
  We have established a new convergent scheme to treat analytically
nucleon-nucleon interactions from a chiral effective field theory. The
Kaplan-Savage-Wise (KSW) amplitudes are resummed to fulfill the unitarity or
right hand cut to all orders below pion production threshold. This is achieved
by matching order by order in the KSW power counting the general expression of
a partial wave with resummed unitarity cut, with the inverses of the KSW
amplitudes. As a result, a new convergent and systematic KSW expansion is
derived for an on-shell interacting kernel \cR in terms of which the partial
waves are computed. The agreement with data for the S-waves is fairly good up
to laboratory energies around 350 MeV and clearly improves and reestablishes
the phenomenological success of the KSW amplitudes when treated within this
scheme.


title:
Q^2-evolution of Delta N gamma form factors up to 4 (GeV/c)^2 from JLab
  data

abstract:
  We present the results on the ratios $E_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ and
$S_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ for the $\gamma^* N \to \Delta(1232)$
transition at $Q^2\leq 4 (GeV/c)^2$ extracted from the $p(e,e'p)\pi^0$ cross
section using two approaches: dispersion relations and modified version of
unitary isobar model. The obtained results are in good agreement with the
results of other analyses obtained using truncated multipole expansion at
$Q^2=0.4,~0.525,~0.65,~0.75,~0.9,~1.15,~1.45,~1.8 (GeV/c)^2 $ and within
dynamical and unitary isobar models at $Q^2=2.8,~4 (GeV/c)^2 $. According to
obtained results the ratio $E_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ remains small in all
investigated region of $Q^2$ with very unclear tendency to cross zero above $2
(GeV/c)^2$. The absolute value of the ratio $S_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ is
clearly increasing with increasing $Q^2$, while it should be a constant value
in the pQCD asymptotics. So, at $Q^2\leq4 (GeV/c)^2$ there is no evidence of
approaching pQCD regime for these ratios. None of the soft approaches gives
satisfactory description of the obtained results.


title:
Quons Restricted to the Antisymmetric Subspace: Formalism and
  Applications

abstract:
  In this work we develop a formalism to treat quons restricted to the
antisymmetric part of their many-body space. A model in which a system of
identical quons interact through a pairing force is then solved within this
restriction and the differences between our solution and the usual fermionic
model solution are then presented and discussed in detail. Possible connections
to physical systems are also considered.


title: Nuclear forces in the chiral limit

abstract:
  We investigate the behaviour of the nuclear forces as a function of the light
quark masses (or, equivalently, pion mass) in the framework of chiral effective
field theory at next-to-leading order. The nucleon-nucleon force is described
in terms of one- and two-pion exchange and local short distance operators,
which depend explicitly and implicitly on the quark masses. The pion propagator
becomes Coulomb-like in the chiral limit and thus one has significant
scattering in all partial waves. The pion-nucleon coupling depends implicitly
on the quark masses and we find that it becomes stronger in the chiral limit.
There is a further quark mass dependence in the S-wave four--nucleon couplings,
which can be estimated by means of dimensional analysis. We find that nuclear
physics in the chiral limit becomes natural. There are no new bound states, the
deuteron binding energy is B_D^{CL} = 9.6 +/- 1.9^+1.8_-1.0 MeV, and the S-wave
scattering lengths take values of a few fm, a_{CL} (^1S_0) = -4.1 +/-
1.6^+0.0_-0.4 fm and a_{CL} (^3S_1) = 1.5 +/- 0.4^+0.2_-0.3 fm. We also discuss
the extrapolation to larger pion masses pertinent for the extraction of these
quantities from lattice simulations.


title: Chiral Dynamics of Deeply Bound Pionic Atoms

abstract:
  We present and discuss a systematic calculation, based on two-loop chiral
perturbation theory, of the pion-nuclear s-wave optical potential. A proper
treatment of the explicit energy dependence of the off-shell pion self-energy
together with (electromagnetic) gauge invariance of the Klein-Gordon equation
turns out to be crucial. Accurate data for the binding energies and widths of
the 1s and 2p levels in pionic ^{205}Pb and ^{207}Pb are well reproduced, and
the notorious "missing repulsion" in the pion-nuclear s-wave optical potential
is accounted for. The connection with the in-medium change of the pion decay
constant is clarified.


title:
Resonance states below pion-nucleon threshold and their consequences for
  nuclear systems

abstract:
  Regular sequences of narrow peaks have been observed in the missing mass
spectra in the reactions pp --> p pi^+ X and pd --> ppX_1 below pion-production
threshold. They are interpreted in the literature as manifestations of
supernarrow light dibaryons, or nucleon resonances, or light pions forming
resonance states with the nucleon in its ground state. We discuss how existence
of such exotic states would affect properties of nuclear systems. We show that
the neutron star structure is drastically changed in all three cases. We find
that in the presence of dibaryons or nucleon resonances the maximal possible
mass of a neutron star would be smaller than the observational limit. Presence
of light pions does not contradict the observed neutron star masses. Light
pions allow for the existence of extended nuclear objects of arbitrary size,
bound by strong and electromagnetic forces.


title: High energy photons from passage of jets through quark gluon plasma

abstract:
  We calculate the production of high energy photons from Compton scattering
and annihilation of a quark jet passing through a quark gluon plasma produced
in a relativistic heavy ion collision. The contributions are large and reflect
the momentum distribution of the jets and the initial conditions of the plasma.


title: Differential Flow of Protons in Au+Au Collisions at AGS Energies

abstract:
  We study the proton sideward and elliptic differential flow for Au+Au
collisions at AGS energies (2 -- 8 A cdot GeV) in a microscopic relativistic
transport model that includes all baryon resonances up to a mass of 2 GeV as
well as string degrees of freedom for the higher hadronic excitations. In order
to explore the sensitivity of the various differential flows to the nuclear
equation of state (EoS) we use three different parameterizations of the scalar-
and vector mean-fields, i.e. NL2 (soft), NL23 (medium) and NL3 (hard), with
their momentum dependence fitted to the experimental Schrodinger equivalent
potential (at normal nuclear matter density rho_0) up to kinetic energies of 1
GeV. We calculate the excitation function of sideward and elliptic flow within
these parameter sets for Au+Au collisions and compare with the recent data from
the E895 Collaboration as a function of rapidity, impact parameter and
transverse momentum, respectively. We find that the best description of the
differential data is provided by a rather 'stiff' EoS at 2 A cdot GeV (NL3)
while at higher bombarding energies (4--8 A cdot GeV) a 'medium' EoS leads to
the lowest chi^2 with respect to the data. However, the differences in the
transverse and elliptic flows (from the different parameter sets) become of
minor significance at 4--8 A cdot GeV. We attribute this insensitivity to a
similar reduction of the vector potential in all models and to the dominance of
string degrees of freedom at these bombarding energies.


title: Charmonium mass in nuclear matter

abstract:
  The mass shift of charmonium states in nuclear matter is studied in the
perturbative QCD approach. The leading-order effect due to the change of gluon
condensate in nuclear matter is evaluated using the leading-order QCD formula,
while the higher-twist effect due to the partial restoration of chiral symmetry
is estimated using a hadronic model. We find that while the mass of $J/\psi$ in
nuclear matter decreases only slightly, those of $\psi(3686)$ and $\psi(3770)$
states are reduced appreciably. Experimental study of the mass shift of
charmonium states in nuclear matter can thus provide valuable information on
the changes of the QCD vacuum in nuclear medium.


title:
Time Structure of Anomalous J/psi and psi' suppression in nuclear
  collisions

abstract:
  The data for the mean squared transverse momentum P_t as function of
transverse energy E_t of J/Psi and Psi' produced in Pb-Pb collisions at the
CERN-SPS are analyzed and it is claimed that they contain information about the
time structure of anomalous suppression. A transport equation which describes
transverse motion of J/Psi and Psi' in the absorptive medium is proposed and
solved for a QGP and a comover scenario of suppression. While the comover
approach accounts for the data fairly well without adjusting any parameter, the
fit to the data within the QGP scenario requires to assume anomalous
suppression to become effective rather late, 3-4 fm/c after the nuclear
overlap.


title:
Light-neutrino mass hierarchies, nuclear matrix elements, and the
  observability of neutrinoless double-beta decay

abstract:
  Results for neutrino flavor oscillations and neutrino mixing mechanisms,
obtained from the analysis of the Sudbury Neutrino Observatory (SNO), the
SuperKamiokande (SK), CHOOZ, KamLAND and WMAP data, are used to calculate the
effective neutrino mass relevant for the neutrinoless double-beta decay. The
observability of the decay of 76Ge is discussed within different light-neutrino
mass hierarchies and by presenting a systematics on the available nuclear
matrix elements.


title:
Energy loss of quarks in deconfined matter at RHIC: photon-tagged jets,
  single electron and dilepton spectra from open charm

abstract:
  We report a first attempt (i) to derive constraints on the energy loss of
charm quarks in a deconfined medium from the recent PHENIX data of
single-electron transverse momentum spectra and (ii) to estimate the resulting
suppression of dileptons from correlated semi-leptonic decays of open charmed
mesons. The momentum imbalance of photon-tagged light-quark jets is also
considered.


title:
Indications for the Nonexistence of Three-Neutron Resonances near the
  Physical Region

abstract:
  The pending question of the existence of three-neutron resonances near the
physical energy region is reconsidered. Finite rank neutron-neutron forces are
used in Faddeev equations, which are analytically continued into the unphysical
energy sheet below the positive real energy axis. The trajectories of the
three-neutron S-matrix poles in the states of total angular momenta and parity
J^\pi=1/2 +- and J^\pi= 3/2 +- are traced out as a function of artificial
enhancement factors of the neutron-neutron forces. The final positions of the
S-matrix poles removing the artificial factors are found in all cases to be far
away from the positive real energy axis, which provides a strong indication for
the nonexistence of nearby three-neutron resonances. The pole trajectories
close to the threshold E=0 are also predicted out of auxiliary generated
three-neutron bound state energies using the Pad\'e method and agree very well
with the directly calculated ones.


title: SAID Results for GDH-Related Sum Rules

abstract:
  Model-dependence of the single-pion contribution to the GDH, Baldin, and
forward spin-polarizability sum rules is explored, using the most recent SAID
multipole analysis. Results from SAID and MAID are compared.


title: Evolution of Fluctuation in relativistic heavy-ion collisions

abstract:
  We have studied the time evolution of the fluctuations in the net baryon
number for different initial conditions and space time evolution scenarios. We
observe that the fluctuations at the freeze-out depend crucially on the
equation of state (EOS) of the system and for realistic EOS the initial
fluctuation is substantially dissipated at the freeze-out stage. At SPS
energies the fluctuations in net baryon number at the freeze-out stage for
quark gluon plasma and hadronic initial state is close to the Poissonian noise
for ideal as well as for EOS obtained by including heavier hadronic degrees of
freedom. For EOS obtained from the parametrization of lattice QCD results the
fluctuation is larger than Poissonian noise. It is also observed that at RHIC
energies the fluctuations at the freeze-out point deviates from the Poissonian
noise for ideal as well as realistic equation of state, indicating presence of
dynamical fluctuations.


title: Chiral dynamics of p-wave in K^- p and coupled states

abstract:
  We perform an evaluation of the p-wave amplitudes of meson-baryon scattering
in the strangeness S=-1 sector starting from the lowest order chiral
Lagrangians and introducing explicitly the Sigma^* field with couplings to the
meson-baryon states obtained using SU(6) symmetry. The N/D method of
unitarization is used, equivalent, in practice, to the use of the
Bethe-Salpeter equation with a cut-off. The procedure leaves no freedom for the
p-waves once the s-waves are fixed and thus one obtains genuine predictions for
the p-wave scattering amplitudes, which are in good agreement with experimental
results for differential cross sections, as well as for the width and partial
decay widths of the Sigma^*(1385).


title: Formation of sigma Mesic Nuclei in (d,t) and (d,^3He) Reactions

abstract:
  We explore the possibility to observe an enhanced 2pi correlation in the
scalar iso-scalar (sigma) channel in nuclei by (d,t) and (d,^3He) reactions to
obtain new information on the partial restoration of chiral symmetry in the
nuclear medium. The sensitivity of the reaction spectra on the change of the
chiral condensate in the nuclear medium is examined.


title: The Origin of Large-p_T pi^0 Suppression at RHIC

abstract:
  We present results for inclusive $\pi^0$ production in proton-proton and in
Au-Au at RHIC energy $\sqrt s=200$ GeV. We use next-to-leading order
perturbative QCD calculation and we include nuclear effects such as parton
energy loss and nuclear shadowing. We consider the ratio of $\pi^0$
distribution in Au-Au and p-p collisions for $p_T > 3$ GeV for three cases of
parton energy loss: 1) constant parton energy loss per parton scattering,
$\epsilon^a_n=const$, 2) Landau-Pomeranchuk-Migdal energy-dependent energy
loss, $\epsilon^a_n \sim \sqrt E^a_n$ and 3) Bethe-Heitler energy-dependent
energy loss, $\epsilon^a_n \sim E^a_n$. We show that recently observed
suppression of $\pi^0$ production in Au-Au collisions at RHIC, which is found
to increase with $p_T$ increasing from 3GeV to 8GeV, can be reproduced by
$\epsilon^a_n=0.06 E^a_n$. We show that the ratio of prompt photons to neutral
pions produced in Au-Au collisions at RHIC has a strong $p_T$ dependence
approaching one at $p_T\sim 10$GeV.


title: The phi NN coupling from chiral loops

abstract:
  Starting from effective Lagrangians which combine a gauge formulation of
Vector Meson Dominance with Chiral Lagrangians, the coupling of the phi to the
nucleon, which is zero at tree level due to the OZI rule, is calculated
perturbatively considering loop contributions to the electric and magnetic form
factors. We obtain reasonably smaller values for both form factors than those
for rho NN and consistent with the expected order of magnitude of the OZI rule
violation.


title: Analysis of directed flow from three-particle correlations

abstract:
  We present a new method for analysing directed flow, based on a
three-particle azimuthal correlation. It is less biased by nonflow correlations
than two-particle methods, and requires less statistics than four-particle
methods. It is illustrated on NA49 data.


title: Omega photoproduction

abstract:
  Photoproduction of omega-meson is analyzed within meson exchange model and
Regge model and compared to rho-meson photoproduction. An interplay between two
models and uncertainties in data reproduction are discussed.


title: Determination of the Equation of State of Dense Matter

abstract:
  Nuclear collisions can compress nuclear matter to densities achieved within
neutron stars and within core-collapse supernovae. These dense states of matter
exist momentarily before expanding. We analyzed the flow of matter to extract
pressures in excess of 10^34 pascals, the highest recorded under
laboratory-controlled conditions. Using these analyses, we rule out strongly
repulsive nuclear equations of state from relativistic mean field theory and
weakly repulsive equations of state with phase transitions at densities less
than three times that of stable nuclei, but not equations of state softened at
higher densities because of a transformation to quark matter.


title: Excitations of the unstable nuclei ^{48}Ni and ^{49}Ni

abstract:
  The isoscalar E1 and E2 resonances in the proton-rich nuclei ^{48,49}Ni and
the {f_{7/2}3^-} multiplet in ^{49}Ni have been calculated taking into account
the single-particle continuum exactly. The analogous calculations for the
mirror nuclei ^{48}Ca and ^{49}Sc are presented. The models used are the
continuum RPA for ^{48}Ni, ^{48}Ca and the Odd RPA for ^{49}Ni, ^{49}Sc, the
latter has been developed recently and describes both single-particle and
collective excitations of an odd nucleus on a common basis. In all four nuclei
we obtained a distinct splitting of the isoscalar E1 resonance into 1 h-bar
omega and 3 h-bar omega peaks at about 11 MeV and 30 MeV, respectively. The
main part of the isoscalar E1 EWSR is exhausted by the 3 h-bar omega
resonances. The 1 h-bar omega resonances exhaust about 35% of this EWSR in
^{48,49}Ni and about 22% in ^{48}Ca and ^{49}Sc. All seven {f_{7/2}3^-}
multiplet members in ^{49}Ni are calculated to be in the (6-8) MeV energy
region and have noticeable escape widths.


title:
A projected correlation function approach to the pi NN coupling constant
  in QCD sum rules

abstract:
  We propose a new approach to construct QCD sum rules for the pi NN coupling
constant, g, starting from the vacuum-to-pion correlation function of the
interpolating fields of two nucleons and taking its matrix element with respect
to nucleon spinors. The new approach with the projected correlation function is
advantageous because even in the chiral limit the dispersion integral can be
parametrized with well-defined physical parameters. Another advantage of the
new approach is that unwanted pole contribution is projected out. Calculating
the Wilson coefficients of the operator product expansion of the correlation
function up to O(M_B^{-4}) and O(m_pi) where M_B and m_pi are the Borel mass
and the pion mass, respectively, we construct new QCD sum rules for the pi NN
coupling constant from the projected correlation function with consistently
including O(m_pi) corrections. By numerically analyzing the obtained four sum
rules we identified the most prominent one. After roughly estimating errors we
obtaind, g=10 +/- 3, as a result of this sum rule, which is in reasonable
agreement with the empirical value. It is also found that the O(m_pi)
correction is about 5%.


title: Strong Decays of Light Vector Mesons

abstract:
  The vector meson strong decays rho-->pi pi, phi-->KK, and K^star-->pi K are
studied within a covariant approach based on the ladder-rainbow truncation of
the QCD Dyson--Schwinger equation for the quark propagator and the
Bethe--Salpeter equation for the mesons. The model preserves the one-loop
behavior of QCD in the ultraviolet, has two infrared parameters, and implements
quark confinement and dynamical chiral symmetry breaking. The 3-point decay
amplitudes are described in impulse approximation. The Bethe--Salpeter study
motivates a method for estimating the masses for heavier mesons within this
model without continuing the propagators into the complex plane. We test the
accuracy via the rho, phi and K^{star} masses and then produce estimates of the
model results for the a_1 and b_1 masses as well as the mass of the proposed
exotic vector pi_1(1400).


title:
Liquid-Gas Phase Transition of Supernova Matter and Its Relation to
  Nucleosynthesis

abstract:
  We investigate the liquid-gas phase transition of dense matter in supernova
explosion by the relativistic mean field approach and fragment based
statistical model. The boiling temperature is found to be high (T_{boil} >= 0.7
MeV for rho_B >= 10^{-7} fm^{-3}), and adiabatic paths are shown to go across
the boundary of coexisting region even with high entropy. This suggests that
materials experienced phase transition can be ejected to outside. We calculated
fragment mass and isotope distribution around the boiling point. We found that
heavy elements at the iron, the first, second, and third peaks of r-process are
abundantly formed at rho_B = 10^{-7}, 10^{-5}, 10^{-3} and 10^{-2} fm^{-3},
respectively.


title: The Quark-Mass Dependence of Two-Nucleon Systems

abstract:
  We explore the quark-mass dependence of two-nucleon systems. Allowed regions
for the scattering lengths in the 1S0 and 3S1 channels as functions of the
light-quark masses are determined from the current uncertainty in
strong-interaction parameters that appear at next-to-leading order in the
effective field theory. Where experimental constraints are absent, as is the
case for the quark-mass dependent four-nucleon operators, we use naive
dimensional analysis. We find it likely that there is no bound state in the 1S0
channel in the chiral limit. However, given the present uncertainties in
strong-interaction parameters it is unclear whether the deuteron is bound or
unbound in the chiral limit.


title: Off-shell omega production in proton-proton collisions near threshold

abstract:
  The omega production in nucleon-nucleon collisions is described through the
decay of intermediate nuclear resonances. Close to threshold the pp --> pp
omega cross section is dominated by the off-shell production of omega mesons
with masses far below the physical omega mass of 782 MeV. A crucial role plays
thereby the N^*(1535) resonance. Due to a strong N omega decay mode this
resonance leads to off-shell contributions which are in the vicinity of the
threshold about one order of magnitude larger than the experimentally
measurable contribution from only the omega peak. After a subtraction of the
theoretical "background" from off-shell omega production the available data are
accurately reproduced over the entire energy range from very close to threshold
up to several GeV above threshold. The scenario of a weaker N^*(1535) --> N
omega decay mode which is still consistent with electro- and photo-production
data is discussed as well. In the latter case the off-shell contributions to
the pp --> pp omega cross section are substantially reduced but the description
of the experimental cross section is poor above threshold.


title: Three-Nucleon Forces from Chiral Effective Field Theory

abstract:
  We perform the first complete analysis of nd scattering at
next-to-next-to-leading order in chiral effective field theory including the
corresponding three-nucleon force and extending our previous work, where only
the two-nucleon interaction has been taken into account. The three-nucleon
force appears first at this order in the chiral expansion and depends on two
unknown parameters. These two parameters are determined from the triton binding
energy and the nd doublet scattering length. We find an improved description of
various scattering observables in relation to the next-to-leading order results
especially at moderate energies (E_lab = 65 MeV). It is demonstrated that the
long-standing A_y-problem in nd elastic scattering is still not solved by the
leading 3NF, although some visible improvement is observed. We discuss
possibilities of solving this puzzle. The predicted binding energy for the
alpha-particle agrees with the empirical value.


title: Negative heat capacities and first order phase transitions in nuclei

abstract:
  Anomalous negative heat capacities have been claimed as indicators of first
order phase transitions in finite systems in general, and fornuclear systems in
particular. A thermodynamic approach allowing for all Q value terms is used to
evaluate heat capacities in finitevan der Waals fluids and finite lattice
systems in the coexistence region. Fictitious large effects and negative heat
capacities are observed in lattice systems when periodic boundary conditions
are introduced. Small anomalous effects are predicted for small drops and for
finite lattice systems. A straightforward application of the analysis to nuclei
shows that negative heat capacities cannot be observed for A>60.


title: Scalar ground-state observables in the random phase approximation

abstract:
  We calculate the ground-state expectation value of scalar observables in the
matrix formulation of the random phase approximation (RPA). Our expression,
derived using the quasiboson approximation, is a straightforward generalization
of the RPA correlation energy. We test the reliability of our expression by
comparing against full diagonalization in 0 h-bar omega shell-model spaces. In
general the RPA values are an improvement over mean-field (Hartree-Fock)
results, but are not always consistent with shell-model results. We also
consider exact symmetries broken in the mean-field state and whether or not
they are restored in RPA.


title: Excited Baryons and Chiral Symmetry Breaking of QCD

abstract:
  N* masses in the spin-1/2 and spin-3/2 sectors are computed using two
non-perturbative methods: lattice QCD and QCD sum rules. States with both
positive and negative parity are isolated via parity projection methods. The
basic pattern of the mass splittings is consistent with experiments. The mass
splitting within the same parity pair is directly linked to the chiral symmetry
breaking QCD.


title:
Hard Rescattering Mechanism in High Energy Photodisintegration of the
  Light Nuclei

abstract:
  We discuss the high energy photodisintegrataion of light nuclei in which the
energy of the absorbed photon is equally shared between two nucleons in the
target. For these reactions we investigate the model in which photon absorption
by a quark in one nucleon followed by its high momentum transfer interaction
with a quark of the other nucleon leads to the production of two nucleons with
high relative momentum. We sum the relevant quark rescattering diagrams, and
demonstrate that the scattering amplitude can be expressed as a convolution of
the large angle NN scattering amplitude, the hard photon-quark interaction
vertex and the low-momentum nuclear wave function. Within this model we
calculate the cross sections and polarization observables of high energy gamma
+ d --> pn and gamma + ^3He --> pp + n reactions.


title: Supernarrow Dibaryons and Exotic Baryons with Small Masses

abstract:
  A searche for supernarrow dibaryons (SND) and exotic baryons with small
masses is reviewed. As a result of the study of the reaction pd->p+pX_1, three
narrow peaks at M_{pX_1}=1904, 1926, and 1942 MeV have been observed. The
analysis of the angular distributions of the protons from the decay of the pX_1
states showed that the peaks found can be explained as a manifestation of the
isovector SNDs, the decay of which into two nucleons is forbidden by the Pauli
exclusion principle. The observation of the peaks in the missing mass M_{X_1}
spectra at 966, 986, and 1003 MeV is an additional indication that the
dibaryons found are the SNDs. The possible interpretation of these peaks in the
M_{X_1} mass spectra and peaks observed in the reaction pp->pi^+pX at M_X=1004,
1044, and 1094 MeV as new exotic baryon states with small masses is discussed.
The mass equation has been constructed which is used to calculate the masses
and determine parities of the exotic baryons. The obtained values of the masses
are in a good agreement with the experimental data. Two new exotic baryon
states bellow the \pi production threshold have been predicted.


title:
Lorentz Boosted NN Potential for Few-Body Systems: Application to the
  three-nucleon bound state

abstract:
  A Lorentz boosted two-nucleon potential is introduced in the context of equal
time relativistic quantum mechanics. The dynamical input for the boosted
nucleon-nucleon (NN) potential is based on realistic NN potentials, which by a
suitable scaling of the momenta are transformed into NN potentials belonging to
a relativistic two-nucleon Schroedinger equation in the c.m. system. This
resulting Lorentz boosted potential is consistent with a previously introduced
boosted two-body t-matrix. It is applied in relativistic Faddeev equations for
the three-nucleon bound state to calculate the ^3H binding energy. Like in
previous calculations the boost effects for the two-body subsystems are
repulsive and lower the binding energy.


title:
Influence of final state interaction on incoherent pion photoproduction
  on the deuteron in the region of the Delta-resonance

abstract:
  The influence of final state $NN$- and pi N-rescattering in incoherent pion
photoproduction on the deuteron has been investigated. For the elementary
photoproduction operator an effective Lagrangian model is used which describes
well the elementary reaction. The interactions in the final two-body subsystems
are taken in separable form. While NN-rescattering shows quite a significant
effect, particularly strong for neutral pion production, pi N-rescattering is
almost negligible. Inclusion of such effects leads to an improved and quite
satisfactory agreement with experiment.


title: Final State Interactions in Pion Production from Nuclei

abstract:
  We have calculated the effect of the inclusion of final state interactions on
pion production from nuclei with incident pion beams. We find that the effect
of absorption, along with geometric considerations, explains much of the
enhancement at low invariant mass seen in recent data for invariant mass
spectra with increasing atomic number. While the variation among nuclei is well
reproduced for all charge states, the enhancement for the ratio for heavy
nuclei to deuterium for the pi^+ pi^- final state is only partially understood.


title:
Radiation correction to astrophysical fusion reactions and the electron
  screening problem

abstract:
  We discuss the effect of electromagnetic environment on laboratory
measurements of the nuclear fusion reactions of astrophysical interest. The
radiation field is eliminated using the path integral formalism in order to
obtain the influence functional, which we evaluate in the semi-classical
approximation. We show that enhancement of the tunneling probability due to the
radiation correction is extremely small and does not resolve the longstanding
problem that the observed electron screening effect is significantly larger
than theoretical predictions.


title:
Microscopic $NN\to NN^{\ast}(1440)$ transition potential: Determination
  of $\pi NN^{\ast}(1440)$ and $\sigma NN^{\ast}(1440) $ coupling constants

abstract:
  A $NN\to NN^{\ast}(1440)$ transition potential, based on an effective
quark-quark interaction and a constituent quark cluster model for baryons, is
derived in the Born-Oppenheimer approach. The potential shows significant
differences with respect to those obtained by a direct scaling of the
nucleon-nucleon interaction. From its asymptotic behavior we extract the values
of $\pi NN^{\ast}(1440)$ and $\sigma NN^{\ast}(1440)$ coupling constants in a
particular coupling scheme


title:
Comment on "Negative heat and first order phase transitions in nuclei"
  by Moretto et al

abstract:
  The recent paper nucl-th/0208024 by Moretto et al. is commented:
  Their picture of nuclear phase transition in terms of macroscopic control
parameters, temperature and pressure, is irrelevant. Their criticism of
order-disorder phase-transitions on a periodic lattice uses the wrong scenario.
This transition has nothing to do with the liquid-gas transition of a single
spherical droplet.


title:
Possibility of \Lambda\Lambda pairing and its dependence on background
  density in relativistic Hartree-Bogoliubov model

abstract:
  We calculate a \Lambda\Lambda pairing gap in binary mixed matter of nucleons
and \Lambda hyperons within the relativistic Hartree-Bogoliubov model. Lambda
hyperons to be paired up are immersed in background nucleons in a normal state.
The gap is calculated with a one-boson-exchange interaction obtained from a
relativistic Lagrangian. It is found that at background density
\rho_{N}=2.5\rho_{0} the \Lambda\Lambda pairing gap is very small, and that
denser background makes it rapidly suppressed. This result suggests a
mechanism, specific to mixed matter dealt with relativistic models, of its
dependence on the nucleon density. An effect of weaker \Lambda\Lambda
attraction on the gap is also examined in connection with revised information
of the \Lambda\Lambda interaction.


title:
Regularization of Legendre Function Series for Charged Particles
  Improved Nearside-Farside Subamplitudes

abstract:
  A simple regularization procedure is proposed for the Legendre function
series of improved nearside-farside subamplitudes for charged particles elastic
scattering. The procedure is the extension of the usual one which defines the
partial wave series for the scattering amplitude in the presence of a long
range Coulomb term in the potential, and it provides the same convergence rate.


title:
Self-Consistent Quasi-Particle RPA for the Description of Superfluid
  Fermi Systems

abstract:
  Self-Consistent Quasi-Particle RPA (SCQRPA) is for the first time applied to
a more level pairing case. Various filling situations and values for the
coupling constant are considered. Very encouraging results in comparison with
the exact solution of the model are obtained. The nature of the low lying mode
in SCQRPA is identified. The strong reduction of the number fluctuation in
SCQRPA vs BCS is pointed out. The transition from superfluidity to the normal
fluid case is carefully investigated.


title: Phenomenology of Jet Quenching in Heavy Ion Collisions

abstract:
  We derive an analytical expression for the quenching factor in the strong
quenching limit where the $p_T$ spectrum of hard partons is dominated by
surface emission. We explore the phenomenological consequences of different
scaling laws for the energy loss and calculate the additional suppression of
the away-side jet.


title:
Electron Quasielastic Scattering at High Energy from $^{56}$Fe, What
  Suppression?

abstract:
  Quasielastic electron scattering $(e,e')$ from $^{56}$Fe is calculated at
large electron energies (2-4 GeV) and large three momentum transfer (0.5-1.5
GeV/c). We use a relativistic mean-field single particle model for the bound
and continuum nucleon wavefunctions based on the $\sigma-\omega$ model and we
include the effects of electron Coulomb distortion in the calculation. The
calculations are compared to high energy data from SLAC and more recent data
from Jefferson Laboratory, particularly for kinematics where the energy
transfer is less than 500 to 600 MeV and the quasielastic process is expected
to dominate the cross section. The effects of the predicted weakening of the
strong scalar and vector potentials of the $\sigma-\omega$ model at high energy
are investigated. Possible evidence for `longitudinal suppression' or
modifications of nucleon form factors in the medium is considered, but neither
is necessary to explain the quasielastic data for four momentum transfers less
than 1 (GeV/c)$^2$.


title: Further comments on nuclear forces in the chiral limit

abstract:
  We substantiate our statement that the deuteron remains bound in the chiral
limit. We critically discuss recent claims that effective field theory cannot
give a definite answer to this question.


title:
New mechanism for the production of the extremely fast light particles
  in heavy-ion collisions in the Fermi energy domain

abstract:
  Employing a four-body classical model, various mechanisms responsible for the
production of fast light particles in heavy ion collisions at low and
intermediate energies have been studied. It has been shown that at energies
lower than 50 A MeV, light particles of velocities of more than two times
higher than the projectile velocities are produced due to the acceleration of
the target light-particles by the mean field of the incident nucleus. It has
also been shown that precision experimental reaction research in normal and
inverse kinematics is likely to provide vital information about which mechanism
is dominant in the production of fast light particles.


title: Anomalous Behavior of 2+ Excitations around 132Sn

abstract:
  In certain neutron-rich Te isotopes, a decrease in the energy of the first
excited 2+ state is accompanied by a decrease in the E2 strength to that state
from the ground state, contradicting simple systematics and general intuition
about quadrupole collectivity. We use a separable quadrupole-plus-pairing
Hamiltonian and the quasiparticle random phase approximation to calculate
energies, B(E2,0+ -> 2+) strengths, and g factors for the lowest 2+ states near
132Sn (Z >= 50). We trace the anomalous behavior in the Te isotopes to a
reduced neutron pairing above the N = 82 magic gap.


title:
Manifestation of 12-Quark Bag State of He-4 Nucleus in Elastic dHe-4
  Scattering

abstract:
  The He-4 d elastic scattering at the momentum of 19.8 GeV/c is analyzed in
the framework of the Glauber theory. The scattering amplitude was evaluated
using different sets of values of the nucleon-nucleon amplitude parameters and
the He-4 density function as a superposition of the Gaussian functions. It is
shown that it is impossible to describe simultaneously the pHe-4 and dHe-4
elastic scattering cross sections using the same set of the NN-amplitude
parameters. Inclusion of the twelve quark bag admixture to the ground state of
the He-4 nucleus in the calculations allows one to reproduce the experimental
data quite well. It is shown that the admixture manifests itself in the dHe-4
elastic scattering in all region of the momentum transfer. At small t the
effect can be at the level of ~ 10 %. At large t it can be ~ 30 %.


title:
Elimination of Rotational Degrees of Freedom in Expansion Methods for
  Three Nucleons

abstract:
  Euler angles determining rotations of a system as a whole are conveniently
separated in three-particle basis functions. Analytic integration of matrix
elements over Euler angles is done in a general form. Results for the Euler
angle integrated matrix elements of a realistic NN interaction are listed. The
partial wave decomposition of correlated three-body states is considered.


title: Two-Body Dirac Equations for Nucleon-Nucleon Scattering

abstract:
  We investigate the nucleon-nucleon interaction by using the meson exchange
model and the two body Dirac equations of constraint dynamics. This approach to
the two body problem has been successfully tested for QED and QCD relativistic
bound states. An important question we wish to address is whether or not the
two body nucleon-nucleon scattering problem can be reasonably described in this
approach as well. This test involves a number of related problems. First we
must reduce our two body Dirac equations exactly to a Schroedinger-like
equation in such a way that allows us to use techniques to solve our two body
Dirac equations already developed for Schroedinger-like systems in
nonrelativistic quantum mechanics. Related to this we present a new derivation
of Calogero's variable phase shift differential equation for coupled
Schroedinger-like equations. Then we determine if the use of nine meson
exchanges in our two body Dirac equations give a reasonable fit to the
experimental scattering phase shifts for n-p scattering. The data involves
seven angular momentum states including both singlet and the triplet spin
states with orbital angular momentum 0,1,2. Two models that we have tested give
us a fairly good fit. The parameters obtained by fitting the n-p experimental
scattering phase shift give a fairly good prediction for most of the p-p
experimental scattering phase shifts examined (for the spin singlet S and D
states and spin triplet P states). Thus the two body Dirac equations of
constraint dynamics presents us with a fit that encourages the exploration of a
more realistic model. We outline generalizations of the meson exchange model
for invariant potentials that may possibly improve the fit.


title: Effective Operator Treatment of the Anharmonic Oscillator

abstract:
  We analyse the one dimensional quartic oscillator using the effective
operator methodology of Lee and Suzuki. We reproduce known results for low
lying energy eigenvalues.


title: Emission angle dependent HBT at RHIC and beyond

abstract:
  We study the geometrical features of non-central heavy ion collisions
throughout their dynamical evolution from equilibration to thermal freeze-out
within a hydrodynamic picture. We discuss resulting observables, in particular
the emission angle dependence of the HBT radii and the relation of these
oscillations to the geometry at the final stage.


title:
Complex Particle and Light Fragment Emission in the Cascade-Exciton
  Model of Nuclear Reactions

abstract:
  A brief description of our improvements and refinements that led from the
CEM95 version of the Cascade-Exciton Model (CEM) code to CEM97 and to CEM2k is
given. The increased accuracy and predictive power of the code CEM2k are shown
by several examples. To describe fission and light-fragment (heavier than 4He)
production, the CEM2k code has been merged with the GEM2 code of Furihata. We
present some results on proton-induced fragmentation and fission reactions
predicted by this extended version of CEM2k. We show that merging CEM2k with
GEM2 allows us to describe many fission and fragmentation reactions in addition
to the spallation reactions which are already relatively well described. We
have initiated another approach to describe fission, complex particles and
fragment emission by developing further our CEM2k code addressing specifically
these problems. In this effort, we have developed our own universal
approximation for inverse cross sections, new routines to calculate Coulomb
barriers and widths of emitted particles and to simulate their kinetic energy
using arbitrary approximations for the inverse cross sections. To describe
fission-fragment production, we have incorporated into CEM2k a thermodynamical
model of fission by Stepanov. This extended version of CEM2k allows us to
describe much better complex particle emission and many fission fragments, but
it is still incomplete and needs further work.


title:
Low Energy Pion--Nucleon Scattering in the Heavy Baryon and Infrared
  Schemes

abstract:
  We study pion--nucleon scattering with a chiral lagrangian of pions,
nucleons, and $\Delta$-isobars to order $Q^3$, where $Q$ is a generic small
momentum. We compare the results from heavy baryon chiral perturbation theory
with those from the infrared regularization scheme. While the former provides a
reasonable fit to the data out to a pion c.m. kinetic energy of 100 MeV, the
latter is only able to fit up to 40 MeV and even then the parameters obtained
are unreasonable. Difficulties with the infrared scheme in the $u$-channel are
discussed.


title:
Complete next-to-leading order calculation for pion production in
  nucleon-nucleon collisions at threshold

abstract:
  Based on a counting scheme that explicitly takes into account the large
momentum sqrt(M m_pi) characteristic for pion production in nucleon-nucleon
collisions we calculate all diagrams for the reaction NN --> NN pi at threshold
up to next-to-leading order. At this order there are no free parameters and the
size of the next-to-leading order contributions is in line with the expectation
from power counting. The sum of loop corrections at that order vanishes for the
process pp --> pp pi^0 at threshold. The total contribution at next-to-leading
order from loop diagrams that include the delta degree of freedom vanishes at
threshold in both reaction channels pp --> pp pi^0, pn pi^+.


title: Final state interaction in lepton scattering off deuterons

abstract:
  The role of the final state interactions (FSI) in inclusive electro
disintegration of the deuteron, D(e,e')X, is being investigated within
different approaches. A detailed comparison between an improved Glauber method
and the standard Schroedinger approach is presented. It is shown that both
methods become inadequate at large values of Q^2, where the virtuality of the
hit nucleon after photon absorbtion is very high. The concept of finite
formation time (FFT) required by the hit hadron to reach its asymptotic form is
introduced by a Feynman diagram approach and by explicitly taking into account
the dependence of the ejected nucleon on its virtuality. The approach has been
applied both at x_{Bj} ~= 1, as well as in the so called cumulative region i.e.
at x_{Bj} > 1. Numerical calculations show that the effects of the FFT almost
completely cancel the contribution from rescattering processes. In the
cumulative region the color transparency or finite formation time effects
become fairly visible.


title: Fluctuations of the Elliptic Flow

abstract:
  We suggest to perform systematic measurements of the elliptic flow
fluctuations which are sensitive to the early stage dynamics of heavy-ion
collisions at high-energies. Significant flow fluctuations are shown to be
generated due to the formation of topological clusters and development of the
filamentation instability. The statistical noise and hydrodynamic fluctuations
are also estimated.


title: Toward coupled-cluster implementations in nuclear structure

abstract:
  We discuss an initial implementation of the coupled-cluster method for
nuclear structure calculations and apply our method to He-4. We will discuss
the future directions that this research will take as we move from method
testing and development to more complete calculations.


title: Coupling of giant resonances to soft E1 and E2 modes in B-8

abstract:
  The dynamic coupling between giant resonance states and "soft", low-energy
excitation, modes in weakly-bound nuclei is investigated. A coupled-channels
calculation is reported for the reaction 8B + Pb --> p + 7Be + Pb at 83
MeV/nucleon. It is shown that the low-energy response is only marginally
modified by transitions to the isovector giant dipole and isoscalar giant
quadrupole resonances.


title:
Parameter-free effective field theory calculation for the solar
  proton-fusion and hep processes

abstract:
  Spurred by the recent complete determination of the weak currents in
two-nucleon systems up to ${\cal O}(Q^3)$ in heavy-baryon chiral perturbation
theory, we carry out a parameter-free calculation of the threshold $S$-factors
for the solar $pp$ (proton-fusion) and $hep$ processes in an effective field
theory that {\it combines} the merits of the standard nuclear physics method
and systematic chiral expansion. The power of the EFT adopted here is that one
can correlate in a unified formalism the weak-current matrix elements of two-,
three- and four-nucleon systems. Using the tritium $\beta$-decay rate as an
input to fix the only unknown parameter in the theory, we can evaluate the
threshold $S$ factors with drastically improved precision; the results are
$S_{pp}(0) = 3.94\times(1 \pm 0.004) \times 10^{-25} {MeV-b}$ and $S_{hep}(0) =
(8.6\pm 1.3)\times 10^{-20} {keV-b}$. The dependence of the calculated
$S$-factors on the momentum cutoff parameter $\Lambda$ has been examined for a
physically reasonable range of $\Lambda$. This dependence is found to be
extremely small for the $pp$ process, and to be within acceptable levels for
the $hep$ process, substantiating the consistency of our calculational scheme.


title: Multi-Quark Hadrons and S=-2 Hypernuclei

abstract:
  The general character of 4-quark (mesonic) and strange 6-quark (baryonic)
quark systems is very briefly reviewed a la Jaffe, i.e. in the MIT bag, and so
far still possibly viable candidates are indicated. Concentration is on S=-2
systems. Traditionally, one employs the (K^-,K^+) reaction on a relatively
light target and hopes to retain two units of strangeness on a single final
state fragment. Alternatively, heavy ion reactions can be used to produce
Lambda-hyperons copiously and one seeks to observe coalescence of two of these
particles into the lightest S=-2 nucleus, the H-dibaryon. The complications
arising from the presence of a repulsive core in the baryon-baryon interaction
on the production of the H are discussed. Also considered is the possible
presence in the data from the AGS experiment E906, of slightly heavier S=-2
nuclei, in particular_{Lambda Lambda}^{4}H.


title: Quasiparticle Properties in Effective Field Theory

abstract:
  The quasiparticle concept is an important tool for the description of
many-body systems. We study the quasiparticle properties for dilute Fermi
systems with short-ranged, repulsive interactions using effective field theory.
We calculate the proper self-energy contributions at order (K_f/Lambda)^3,
where Lambda is the short-distance scale that sets the size of the effective
range parameters and K_f the Fermi momentum. The quasiparticle energy, width,
and effective mass to order O(K_f/Lambda)^3 are derived from the calculated
self-energy.


title: Effective Field Theory for Fermi Systems in a large N expansion

abstract:
  A system of fermions with short-range interactions at finite density is
studied using the framework of effective field theory. The effective action
formalism for fermions with auxiliary fields leads to a loop expansion in which
particle-hole bubbles are resummed to all orders. For spin-independent
interactions, the loop expansion is equivalent to a systematic expansion in
1/N, where "N" is the spin-isospin degeneracy g. Numerical results at
next-to-leading order are presented and the connection to the Bose limit of
this system is elucidated.


title: Deuteron NN*(1440) components from a chiral quark model

abstract:
  We present a nonrelativistic coupled-channel calculation of the deuteron
structure including Delta Delta and NN^*(1440) channels, besides the standard
NN S and D-wave components. All the necessary building blocks to perform the
calculation have been obtained from the same underlying quark model. The
calculated NN^*(1440) probabilities find support in the explanation given to
different deuteron reactions.


title:
A study of randomness, correlations and collectivity in the nuclear
  shell model

abstract:
  A variable combination of realistic and random two-body interactions allows
the study of collective properties, such as the energy spectra and B(E2)
transition strengths in 44Ti, 48Cr and 24Mg. It is found that the average
energies of the yrast band states maintain the ordering for any degree of
randomness, but the B(E2) values lose their quadrupole collectivity when
randomness dominates the Hamiltonian. The high probability of the yrast band to
be ordered in the presence of pure random forces exhibits the strong
correlations between the different members of the band.


title: Thermal description of transverse-momentum spectra at RHIC

abstract:
  We show that the transverse-momentum spectra of all hadrons measured at RHIC,
including hyperons, are described very well in a thermal model assuming the
simultaneous chemical and thermal freeze-outs. The model calculation takes into
account all hadronic resonances and uses a simple parametrization of the
freeze-out hypersurface.


title: Excited bands in odd-mass rare-earth nuclei

abstract:
  Normal parity bands are studied in 157Gd, 163Dy and 169Tm using the pseudo
SU(3) shell model. Energies and B(E2) transition strengths of states belonging
to six low-lying rotational bands with the same parity in each nuclei are
presented. The pseudo SU(3) basis includes states with pseudo-spin 0 and 1, and
1/2 and 3/2, for even and odd number of nucleons, respectively. States with
pseudo-spin 1 and 3/2 must be included for a proper description of some excited
bands.


title: Soft Physics, Centrality and Multiplicity at RHIC

abstract:
  The inclusive spectra so far accumulated at the Relativistic Heavy Ion
Collider (RHIC) at energies of $\sqrt{s} = 56, 130$ and 200 GeV are examined
within the hadronic simulation LUCIFER. What emerges at this juncture is a
comprehensive and clear picture of soft physics which apparently dominates the
intermediate and later stages of the ion collisions. The focus is on energy and
centrality dependence of the mid-rapidity charged spectra, using an analysis
based for the most part on production and rescattering of intermediate generic
resonances. The bosonic Rho and K(*)-like resonances, produced in initial
nucleon-nucleon interactions and materialising only after some delay time,
behave like an incompressible fluid with saturated number and energy density.


title:
Probing the Isospin Dependent In-Medium Nucleon-Nucleon Cross Section by
  Nucleon Emissions

abstract:
  The effects of the symmetry potential and the isospin dependent in-medium
nucleon-nucleon (NN) cross section on the number of proton(neutron) emissions
N$_p(N_n$) are studied respectively within an isospin-dependent quantum
molecular dynamics (IQMD) model. The isospin dependent in-medium NN cross
section is found to have a strong influence on N$_p(N_n$) but N$_p(N_n$) is not
sensitive to the symmetry potential for the neutron-deficient colliding system
at relatively high energies.We propose to make use of the N$_p(N_n$) as a probe
to extract information on the isospin dependent in-medium NN cross section.


title: The universal freeze-out criterion at SPS and RHIC

abstract:
  We formulate a freeze-out criterion for ultra-relativistic heavy ion
collisions in terms of the pion escape probability from the collision region.
We find that the increase in pion phase-space density from SPS to RHIC reported
at this conference has a small influence on particle freeze-out because of the
small pi-pi cross-section. Our treatment takes into account dynamical
expansion, chemical composition and momentum of the escaping particle for
particle freeze-out. It supports a freeze-out at rather low temperature - below
100 MeV - and earlier decoupling of high p_t particles.


title:
Off-shell effects and consistency of many-body treatments of dense
  matter

abstract:
  Effective field theory requires all observables to be independent of the
representation used for the quantum field operators. It means that off-shell
properties of the interactions should not lead to any observable effects. We
analyse this issue in the context of many-body approaches to nuclear matter,
where it should be possible to shift the contributions of lowest order in
purely off-shell two-body interactions into three-body forces. We show that
none of the commonly used truncations of the two-body scattering amplitude such
as the ladder, Brueckner-Hartree-Fock or parquet approximations respect this
requirement.


title:
Charge Screening at First Order Phase Transitions and Hadron - Quark
  Mixed Phase

abstract:
  Possibility of structured mixed phases at first order phase transitions in
neutron stars is re-examined by taking into account charge screening and
surface effects. Transition from the hadron $npe$ phase to the quark phase is
studied. Two possibilities, the mixed phase and two separate phases given by
the double-tangent (Maxwell) construction are considered. Inhomogeneous
profiles of the electric potential and their contribution to the energy are
analytically calculated. The electric field configurations determine the
droplet size and the geometry of structures.


title:
Collective flow and HBT radii from a full 3D hydrodynamic model with
  early chemical freeze out

abstract:
  We investigate the effect of early chemical freeze-out on hydrodynamic flow
and HBT radii at the RHIC energy with a genuinely three dimensional
hydrodynamic model. It is found that the property of early chemical freeze out
reduces radial flow, elliptic flow, R_out and R_long.


title: Theory of the Trojan-Horse Method

abstract:
  The Trojan-Horse method is an indirect approach to determine the energy
dependence of S-factors of astrophysically relevant two-body reactions. This is
accomplished by studying closely related three-body reactions under quasi-free
scattering conditions. The basic theory of the Trojan-Horse method is developed
starting from a post-form distorted wave Born approximation of the T-matrix
element. In the surface approximation the cross section of the three-body
reaction can be related to the S-matrix elements of the two-body reaction. The
essential feature of the Trojan-Horse method is the effective suppression of
the Coulomb barrier at low energies for the astrophysical reaction leading to
finite cross sections at the threshold of the two-body reaction. In a modified
plane wave approximation the relation between the two-body and three-body cross
sections becomes very transparent. The appearing Trojan-Horse integrals are
studied in detail.


title: Effective Theory of the Color-Flavor-Locked Phase

abstract:
  We explain how an effective theory of the CFL phase can be used to study the
effect of the strange quark mass on the ground state and the excitation
spectrum. We also apply the effective theory to the problem of neutrino
emission from a CFL quark core inside a neutron star.


title: Facets of confinement and dynamical chiral symmetry breaking

abstract:
  The gap equation is a cornerstone in understanding dynamical chiral symmetry
breaking and may also provide clues to confinement. A symmetry-preserving
truncation of its kernel enables proofs of important results and the
development of an efficacious phenomenology. We describe a model of the kernel
that yields: a momentum-dependent dressed-quark propagator in fair agreement
with quenched lattice-QCD results; and chiral limit values: f_pi= 68 MeV and
<q-bar q> = -(190 MeV)^3. It is compared with models inferred from studies of
the gauge sector.


title: Strong Decays of Strange Quarkonia

abstract:
  In this paper we evaluate strong decay amplitudes and partial widths of
strange mesons (strangeonia and kaonia) in the 3P0 decay model. We give
numerical results for all energetically allowed open-flavor two-body decay
modes of all nsbar and ssbar strange mesons in the 1S, 2S, 3S, 1P, 2P, 1D and
1F multiplets, comprising strong decays of a total of 43 resonances into 525
two-body modes, with 891 numerically evaluated amplitudes. This set of
resonances includes all strange qqbar states with allowed strong decays
expected in the quark model up to ca. 2.2 GeV. We use standard nonrelativistic
quark model SHO wavefunctions to evaluate these amplitudes, and quote numerical
results for all amplitudes present in each decay mode. We also discuss the
status of the associated experimental candidates, and note which states and
decay modes would be especially interesting for future experimental study at
hadronic, e+e- and photoproduction facilities. These results should also be
useful in distinguishing conventional quark model mesons from exotica such as
glueballs and hybrids through their strong decays.


title:
Enhancement of nuclear Schiff moments and time reversal violation in
  atoms due to soft nuclear octupole vibrations

abstract:
  Parity and time invariance violating (${\cal P},{\cal T}$-odd) nuclear forces
produce ${\cal P},{\cal T}$-odd nuclear moments, for example, the nuclear
Schiff moment. In turn, this moment can induce electric dipole moments (EDMs)
in atoms. We estimate the contribution to the Schiff moment from the soft
collective octupole vibrations existing in many heavy nuclei. Two possible
mechanisms are considered, mixing of the ground state of an odd-$A$ nucleus
with the octupole phonon state, and ${\cal P},{\cal T}$-odd admixture to the
single-particle wave function of the valence nucleon. We found practically the
same contribution to the Schiff moment as that of the static octupole
deformation calculated earlier. This confirms a suggestion that the soft
octupole vibrations can replace the (controversial) static octupoles in
development of the collective Schiff moments. The values of atomic EDM
predicted for $^{223,225}$Ra and $^{223}$Rn are enhanced by factors up to
$10^{3}$ compared to experimentally studied spherical nuclei $^{199}$Hg and
$^{129}$Xe.


title: Recent Developments of the Cascade-Exciton Model of Nuclear Reactions

abstract:
  Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions
are described. The improved cascade-exciton model as implemented in the code
CEM97 differs from the CEM95 version by incorporating new approximations for
the elementary cross sections used in the cascade, using more precise values
for nuclear masses and pairing energies, using corrected systematics for the
level-density parameters, and several other refinements. We have improved
algorithms used in many subroutines, decreasing the computing time by up to a
factor of 6 for heavy targets. We describe a number of further improvements and
changes to CEM97, motivated by new data on isotope production measured at GSI.
This leads us to CEM2k, a new version of the CEM code. CEM2k has a longer
cascade stage, less preequilibrium emission, and evaporation from more highly
excited compound nuclei compared to earlier versions. CEM2k also has other
improvements and allows us to better model neutron, radionuclide, and gas
production in ATW spallation targets. The increased accuracy and predictive
power of the code CEM2k are shown by several examples. Further necessary work
is outlined.


title:
Benchmarking Ten Codes Against the Recent GSI Measurements of the
  Nuclide Yields from 208Pb, 197Au, and 238U + p Reactions at 1 GeV/nucleon

abstract:
  A qualitative and quantitative comparison of the recent GSI measurements of
the nuclide yields from 208Pb and 238U at 1 GeV/nucleon and 197Au at 800
MeV/nucleon interactions with protons with the codes LAHET (with both ISABEL
and Bertini options), CEM95, CEM97, CEM2k, CASCADE, CASCADE/INPE, YIELDX, HETC,
and INUCL is presented. The predictive power of these codes is reasonable for
nuclides in the near spallation region but is worse for deep spallation and
much worse in the fission region. None of these codes agree well with the data
in the whole mass region of product nuclides and all must be improved to become
reliable tools for accelerator-driven applications.


title:
Development and Validation of the 7Li(p,n) Nuclear Data Library and Its
  Application in Monitoring of Intermediate Energy Neutrons

abstract:
  Systematics have been created for neutron spectra from the 7Li(p,n) reaction
at 0 deg in the 50-200 MeV proton energy region. The available experimental
data in the continuum part of the spectra show satisfactory overall agreement
with a representation based on the phase-space distribution corresponding to
the three-body breakup process 7Li(p,n3He)4He, with empirical correction
factors, which depend regularly on incident energy. Validation of the
systematics included folding of the predicted neutron spectra with standard
238U neutron fission cross section. Modeled in this way distributions of
neutron-induced fission events agree reasonably with experimental data.


title: Periodic Orbits and Deformed Shell Structure

abstract:
  Relationship between quantum shell structure and classical periodic orbits is
briefly reviewed on the basis of semi-classical trace formula. Using the
spheroidal cavity model, it is shown that three-dimensional periodic orbits,
which are born out of bifurcation of planar orbits at large prolate
deformations, generate the superdeformed shell structure.


title:
Exotic shapes in Ca-40 and Ar-36 studied with Antisymmetrized Molecular
  Dynamics

abstract:
  The structures of the ground and excited states of sd-shell nuclei: Ca-40 and
Ar-36 were studied with a method of antisymmetrized molecular dynamics.
Recently observed rotational bands were described with deformed intrinsic
states which are dominated by excited configurations such as 4p-4h, 8p-8h and
4p-8h states. The results showed the coexistence of various kinds of exotic
shapes with oblate, prolate and large prolate deformatios in the low-energy
region of Ca-40. Possible cluster aspects in heavy sd-shell nuclei were implied
in these exotic shapes.


title: Jet Quenching with Detailed Balance in a Thermal QCD Medium

abstract:
  The effect of detailed balance in induced gluon radiation for an energetic
parton propagating inside a quark-gluon plasma is discussed. The stimulated
thermal gluon emission reduces while absorption increases the parton's energy.
The net contribution results in a reduction of the effective parton energy
loss. The relative reduction of the parton energy loss is found to be important
for intermediate parton energies and negligible for very high energies. This
will increase the energy dependence of the parton energy loss and will affect
the shape of suppression of moderately high p_T hadron spectra.


title:
Importance of multi-mesonic fusion processes on (strange) antibaryon
  production

abstract:
  Sufficiently fast chemical equilibration of (strange) antibaryons in an
environment of nucleons, pions and kaons during the course of a relativistic
heavy ion collision can be understood by a `clustering' of mesons to build up
baryon-antibaryon pairs. This multi-mesonic (fusion-type) process has to exist
in medium due to the principle of detailed balance. Novel numerical
calculations for a dynamical setup are presented. They show that - at maximum
SPS energies - yields of each antihyperon specie are obtained which are
consistent with chemical saturated populations of T approximately 150-160 MeV,
in line with popular chemical freeze-out parameters extracted from thermal
model analyses.


title: The deconfined phase near Tc and its decay into hadrons

abstract:
  We sketch an effective theory for the deconfined state of QCD near Tc. This
relates the behavior of the expectation value of the Polyakov loop, and its
two-point functions, to the pressure. Defining the ``mass'' of three and two
gluon states from the imaginary and real parts of the Polyakov loop, while this
ratio is 3:2 in perturbation theory, at Tc it is 3:1. We also discuss the decay
of the deconfined state into hadrons.


title: Nucleon Polarizabilities from Low-Energy Compton Scattering

abstract:
  An effective field theory is used to give a model-independent description of
Compton scattering at energies comparable to the pion mass. The amplitudes for
scattering on the proton and the deuteron, calculated to fourth order in small
momenta in chiral perturbation theory, contain four undetermined parameters
that are in one-to-one correspondence with the nucleon polarizabilities. These
polarizabilities are extracted from fits to data on elastic photon scattering
on hydrogen and deuterium. For the proton we find: alpha_p = 12.1 +/- 1.1 +/-
0.5, beta_p = 3.4 +/- 1.1 +/- 0.1, both in units of 10^{-4} fm^3. For the
isoscalar polarizabilities we obtain: alpha_N = 13.0 +/- 1.9 +3.9/-1.5 (in the
same units) while beta_N is consistent with zero, within sizeable error bars.


title: Faddeev-Yakubovsky search for Lambda-Lambda hydrogen-4

abstract:
  Evidence for particle stability of Lambda-Lambda hydrogen-4 (4LLH) has been
suggested by the BNL-AGS E906 experiment. We report on Faddeev-Yakubovsky
calculations for the four-body Lambda-Lambda-p-n system using Lambda-N
interactions which reproduce the observed binding energy of Lambda hydrogen-3
(3LH) within a Faddeev calculation for the Lambda-p-n subsystem. No 4LLH bound
state is found over a wide range of Lambda-Lambda interaction strengths,
although the Faddeev equations for a three-body Lambda-Lambda-d model of 4LLH
admit a 1+ bound state for as weak a Lambda-Lambda interaction strength as
required to reproduce the binding energy of Lambda-Lambda Helium-6 (6LLHe).


title:
\eta-Scaling of dN_{ch}/d\eta at sqrt{s_{NN}} = 200 GeV by the PHOBOS
  Collaboration and the Ornstein-Uhlenbeck stochastic process

abstract:
  Using the latest data concerning $dN_{\rm ch}/d\eta$ at $\sqrt{s_{NN}} = 200$
GeV, we have analyzed them by means of stochastic theory named the
Ornstein-Uhlenbeck process with two sources. Moreover, we display that $z_r =
\eta/\sqrt{< \eta^2>} = \eta/\eta_{rms}$ scaling with centrality cuts are
described by two Gaussian distributions.


title:
A Global Potential Analysis of the $^{16}$O+$^{28}$Si Reaction Using a
  New Type of Coupling Potential

abstract:
  A new approach has been used to explain the experimental data for the
$^{16}$O+$^{28}$Si system over a wide energy range in the laboratory system
from 29.0 to 142.5 MeV. A number of serious problems has continued to plague
the study of this system for a couple of decades. The explanation of anomalous
large angle scattering data; the reproduction of the oscillatory structure near
the Coulomb barrier; the out-of-phase problem between theoretical predictions
and experimental data; the consistent description of angular distributions
together with excitation functions data are just some of these problems. These
are long standing problems that have persisted over the years and do represent
a challenge calling for a consistent framework to resolve these difficulties
within a unified approach. Traditional frameworks have failed to describe these
phenomena within a single model and have so far only offered different
approaches where these difficulties are investigated separately from one
another. The present work offers a plausible framework where all these
difficulties are investigated and answered. Not only it improves the
simultaneous fits to the data of these diverse observables, achieving this
within a unified approach over a wide energy range, but it departs for its
coupling potential from the standard formulation. This new feature is shown to
improve consistently the agreement with the experimental data and has made
major improvement on all the previous coupled-channels calculations for this
system.


title: A Systematic Investigation of Light Heavy-Ion Reactions

abstract:
  We introduce a novel coupling potential for the scattering of deformed light
heavy-ion reactions. This new approach is based on replacing the usual
first-derivative coupling potential by a new, second derivative coupling
potential in the coupled-channels formalism. The new approach has been
successfully applied to the study of the $^{12}$C+$^{12}$C, $^{12}$C+$^{24}$Mg,
$^{16}$O+$^{28}$Si and $^{16}$O+$^{24}$Mg systems and made major improvements
over all the previous coupled-channels calculations for these systems. This
paper also shows the limitations of the standard coupled-channels theory and
presents a global solution to the problems faced in the previous theoretical
accounts of these reactions.


title:
New Results in the Analysis of the $^{16}$O+$^{28}$Si Elastic Scattering
  by Modifying the Optical Potential

abstract:
  The elastic scattering of the $^{16}$O+$^{28}$Si system has been analyzed
with a modified potential within the framework of the optical model over a wide
energy range in the laboratory system from 29.0 to 142.5 MeV. This system has
been extensively studied over the years and a number of serious problems has
remained unsolved: The explanation of the anomalous large angle scattering
data; the out-of-phase problem between theoretical predictions and experimental
data; the reproduction of the oscillatory structure near the Coulomb barrier;
the consistent description of angular distributions together with the
excitation functions data are just some of these problems. We propose the use
of a modified potential method to explain these problems over this wide energy
range. This new method consistently improves the agreement with the
experimental data and achieves a major improvement on all the previous Optical
model calculations for this system.


title:
Collisional Effects in Isovector Response Function of Nuclear Matter at
  Finite Temperature

abstract:
  The dipole response function of nuclear matter at zero and finite
temperatures is investigated by employing the linearized version of the
extended TDHF theory with a non-Markovian binary collision term. Calculations
are carried out for nuclear dipole vibrations by employing the
Steinwedel-Jensen model and compared with experimental results for $^{120}Sn$
and $^{208}Pb$.


title: The two pion decay of the Roper resonance

abstract:
  We evaluate the two pion decay of the Roper resonance in a model where
explicit re-scattering of the two final pions is accounted for by the use of
unitarized chiral perturbation theory. Our model does not include an explicit
  $\epsilon$ or $\sigma$ scalar-isoscalar meson decay mode, instead it
generates it dynamically by means of the pion re-scattering. The two ways,
explicit or dynamically generated, of introducing this decay channel have very
different amplitudes.
  Nevertheless, through interference with the other terms of the model we are
able to reproduce the same phenomenology as models with explicit consideration
of the $\epsilon$ meson.


title: Model of multifragmentation, Equation of State and phase transition

abstract:
  We consider a soluble model of multifragmentation which is similar in spirit
to many models which have been used to fit intermediate energy heavy ion
collision data. We draw a p-V diagram for the model and compare with a p-V
diagram obtained from a mean-field theory. We investigate the question of
chemical instability in the multifragmentation model. Phase transitions in the
model are discussed.


title:
Equation of State for the Two-component Van der Waals Gas with
  Relativistic Excluded Volumes

abstract:
  A canonical partition function for the two-component excluded volume model is
derived, leading to two different van der Waals approximations. The one is
known as the Lorentz-Berthelot mixture and the other has been proposed
recently. Both models are analysed in the canonical and grand canonical
ensemble. In comparison with the one-component van der Waals excluded volume
model the suppression of particle densities is reduced in these two-component
formulations, but in two essentially different ways. Presently used
multi-component models have no such reduction. They are shown to be not correct
when used for components with different hard-core radii. For high temperatures
the excluded volume interaction is refined by accounting for the Lorentz
contraction of the spherical excluded volumes, which leads to a distinct
enhancement of lighter particles. The resulting effects on pion yield ratios
are studied for AGS and SPS data.


title: $J/\psi$ suppression in Pb+Pb collisions and $p_T$ broadening

abstract:
  We have analysed the NA50 data, on the centrality dependence of $p_T$
broadening of $J/\psi$'s, in Pb+Pb collisions, at the CERN-SPS. The data were
analysed in a QCD based model, where $J/\psi$'s are suppressed in 'nuclear'
medium. Without any free parameter, the model could explain the NA50 $p_T$
broadening data. The data were also analysed in a QGP based threshold model,
where $J/\psi$ suppression is 100% above a critical density. The QGP based
model could not explain the NA50 $p_T$ broadening data. We have also predicted
the centrality dependence of $J/\psi$ suppression and $p_T$ broadening at RHIC
energy. Both the models, the QGP based threshold model and the QCD based
nuclear absorption model, predict $p_T$ broadening very close to each other.


title:
Break-up and electromagnetic response of light weakly-bound dicluster
  systems

abstract:
  This study is focused on the break-up and electromagnetic response of light
weakly-bound dicluster nuclei. The cluster picture in the case of $ ^7$Li is
shown to be a very good approximation and in this framework we calculate
nuclear structure observables. We solve the Schr\"odinger equation for the
relative motion both for discrete and continuum states and this automatically
takes into a proper account the role of resonances. A concentration of strength
in the low energy continuum, solely due to the weakly-bound nature of the bound
states is seen and explained as a favourable matching between the wavelengths
of the initial and final states. Finally preliminary results on form factors
are briefly outlined and their microscopic derivation as well as utilization in
reaction studies is discussed.


title:
Calculated corrections to superallowed Fermi beta decay: New evaluation
  of the nuclear-structure-dependent terms

abstract:
  The measured $ft$-values for superallowed $0^{+} \to 0^{+}$ nuclear
$\beta$-decay can be used to obtain the value of the vector coupling constant
and thus to test the unitarity of the Cabibbo-Kobayashi-Maskawa matrix. An
essential requirement for this test is accurate calculations for the radiative
and isospin symmetry-breaking corrections that must be applied to the
experimental data. We present a new and consistent set of calculations for the
nuclear-structure-dependent components of these corrections. These new results
do not alter the current status of the unitarity test -- it still fails by more
than two standard deviations -- but they provide calculated corrections for
eleven new superallowed transitions that are likely to become accessible to
precise measurements in the future. The reliability of all calculated
corrections is explored and an experimental method indicated by which the
structure-dependent corrections can be tested and, if necessary, improved.


title:
The Chiral Quark Condensate and the Bag Constant with Finite Chemical
  Potential

abstract:
  A method for obtaining the low chemical potential dependence of the dressed
quark propagator from an effective quark-quark interaction model is developed.
  From this the chemical potential dependence of the chiral quark condensate
and bag constant are evaluated. It is found that the chiral order parameter
decreases with the increasing chemical potential $\mu$, which is qualitatively
different from the results given by some authors in the literature. The reason
for this discrepancy is discussed.


title:
Relativistic Random-Phase Approximation with density-dependent
  meson-nucleon couplings

abstract:
  The matrix equations of the relativistic random-phase approximation (RRPA)
are derived for an effective Lagrangian characterized by density-dependent
meson-nucleon vertex functions. The explicit density dependence of the
meson-nucleon couplings introduces rearrangement terms in the residual two-body
interaction, that are essential for a quantitative description of excited
states. Illustrative calculations of the isoscalar monopole, isovector dipole
and isoscalar quadrupole response of $^{208}$Pb, are performed in the fully
self-consistent RRPA framework, based on effective interactions with a
phenomenological density dependence adjusted to nuclear matter and ground-state
properties of spherical nuclei. The comparison of the RRPA results on multipole
giant resonances with experimental data constrains the parameters that
characterize the isoscalar and isovector channel of the density-dependent
effective interactions.


title: The Role of Produced Hadrons in J/psi Suppression

abstract:
  Hadrons produced in high-energy heavy-ion collisions can suppress the
production of J/psi and other charmonium states by charmonium spontaneous
dissociation as the hot hadronic environment alters the interaction between the
charm quark and charm antiquark. Furthermore, hadrons can thermalize a
charmonium to excite it to higher charmonium states which subsequently
dissociate spontaneously. They can also collide with a charmonium to lead to
its prompt dissociation into an open charm pair.