title: Kaon Condensation in Neutron Stars

abstract:
  We discuss the kaon-nucleon interaction and its consequences for the change
of the properties of the kaon in the medium. The onset of kaon condensation in
neutron stars under various scenarios as well its effects for neutron star
properties are reviewed.


title: Directed Flow of Baryons in Heavy-Ion Collisions

abstract:
  The collective motion of nucleons from high-energy heavy-ion collisions is
analyzed within a relativistic two-fluid model for different equations of state
(EoS). As function of beam energy the theoretical slope parameter F_y of the
differential directed flow is in good agreement with experimental data, when
calculated for the QCD-consistent EoS described by the statistical mixed-phase
model. Within this model, which takes the deconfinement phase transition into
account, the excitation function of the directed flow <P_x> turns out to be a
smooth function in the whole range from SIS till SPS energies. This function is
close to that for pure hadronic EoS and exhibits no minimum predicted earlier
for a two-phase bag-model EoS. Attention is also called to a possible formation
of nucleon antiflow (F_y < 0) at energies of the order of 100 A GeV.


title: Dyson-Schwinger Equations - aspects of the pion

abstract:
  The contemporary use of Dyson-Schwinger equations in hadronic physics is
exemplified via applications to the calculation of pseudoscalar meson masses,
and inclusive deep inelastic scattering with a determination of the pion's
valence-quark distribution function.


title:
Shell Effects in Bubble Nuclei, Atomic Clusters, and Inhomogeneous
  Neutron Matter

abstract:
  We analyze the character of the shell effects/Casimir energy in inhomogeneous
fermion systems. We estimate magnitude of the shell effects and discuss their
dependence on a number of physical parameters (geometry, fermion density,
temperature).


title: Airy-like patterns in heavy ion elastic scattering

abstract:
  A semiclassical analysis of an optical potential cross section is presented.
The cross section considered is characterized by the appearance of an Airy-like
pattern. This pattern is similar to that which is present in many cross
sections, which fit the recent measurements of light heavy ion elastic
scattering, and is considered as a manifestation of a rainbow phenomenon. The
semiclassical analysis shows that, in the case considered, the oscillations
arise from the interference between the contributions from two different terms
of a multi-reflection expansion of the scattering function, and, therefore,
cannot be associated with the rainbow phenomenon.


title:
$\sigma$ Exchange in the NN Interaction within the Chiral Unitary
  Approach

abstract:
  We study the nucleon-nucleon interaction in the isoscalar-scalar channel
using t he chiral unitary approach. The $t$-matrix of the pion-pion scattering
in this c hannel is summed up to all orders using the B-S equation. We find
that the calcu lated results at long distances are close to those of the
$\sigma$-exchange inte raction. In addition, there appears a shorter range
repulsion in this channel.


title: Squeezing mode in nuclear collisions

abstract:
  The time dependent Schroedinger equation is solved analytically for a
simplified model of moving infinite walls. A new knock-out mode is described
which might occur during heavy ion collisions. The outer shell-nucleons are
ionised due to the increase of level energy when two nuclei are approaching
fast enough. This is analogous to the Mott effect but in contrast occurs only
if the reaction time is short enough that no common ionisation threshold in the
compound system is established. To demonstrate this pure nonequilibrium effect
a simulation of realistic heavy ion collision by a nonlocal Boltzmann equation
is performed.

categories: nucl-th cond-mat.stat-mech physics.atm-clus quant-ph


title: Shell model studies of neutron rich nuclei

abstract:
  We discuss the present status of the description of the structure of the very
neutron rich nuclei, in the framework of modern large scale shell model
calculations. Particular attention is paid to the interaction related issues,
as well as to the problems of the shell model approach at the neutron drip
line. We present detailed results for nuclei around N=20 and, more briefly, we
discuss some salient features of the regions close to N=8, 28 and 40. We show
that most experimental features can be understood in a shell model context.


title:
Local equilibrium in heavy-ion collisions: Microscopic analysis of a
  central cell versus infinite matter

abstract:
  We study the local equilibrium in the central $V = 125$ fm$^3$ cell in
heavy-ion collisions at energies from 10.7 AGeV (AGS) to 160 AGeV (SPS)
calculated in the microscopic transport model. In the present paper the hadron
yields and energy spectra in the cell are compared with those of infinite
nuclear matter, as calculated within the same model. The agreement between the
spectra in the two systems is established for times $t \geq 10$ fm/$c$ in the
central cell. The cell results do not deviate noticeably from the infinite
matter calculations with rising incident energy, in contrast to the apparent
discrepancy with predictions of the statistical model (SM) of an ideal hadron
gas. The entropy of this state is found to be very close to the maximum
entropy, while hadron abundances and energy spectra differ significantly from
those of the SM.


title: Review of N N Interaction from Lattice QCD

abstract:
  Historically, lattice studies of QCD have concentrated on understanding the
properties and structure of an isolated hadron. Recently, there have efforts at
understanding the interactions between hadrons. In this talk I will review two
approaches to this problem.


title: Collective flow and multiparticle azimuthal correlations

abstract:
  The measurement of azimuthal distributions in nucleus-nucleus collisions
relies upon the assumption that azimuthal correlations between particles result
solely from their correlation with the reaction plane (i.e. flow). We show that
at SPS energies, the ansatz is no longer valid, and two-particle correlations
due to momentum conservation, final state interactions or resonance decays
become of the same order as those arising from flow. This leads us to introduce
new methods to analyse collective flow, based on a cumulant expansion, which
enable to extract smaller values than those accessible to the standard
analysis.


title: Nuclear Physics Neutrino PreTown Meeting: Summary and Recommendations

abstract:
  In preparation for the nuclear physics Long Range Plan exercise, a group of
104 neutrino physicists met in Seattle September 21-23 to discuss both the
present state of the field and the new opportunities of the next decade. This
report summarizes the conclusions of that meeting and presents its
recommendations. Further information is available at the workshop's web site.
This report will be further reviewed at the upcoming Oakland Town Meeting.


title: Isospin effects on squeeze-out flow in heavy-ion collisions

abstract:
  The squeeze-out flow in reactions of $^{124}$Sn + $^{124}$Sn and $^{124}$Ba +
$^{124}$Ba at different incident energies for different impact parameters is
investigated by means of an isospin-dependent quantum molecular dynamics model.
For the first time, it is found that the more neutron-rich system ($% ^{124}$Sn
+ $^{124}$Sn) exhibits weaker squeeze-out flow. This isospin dependence of the
squeeze-out flow is shown to mainly result from the isospin dependence of
nucleon-nucleon cross section and the symmetry energy.


title:
Finite range effects of nuclear force in intermediate energy heavy ion
  collisions

abstract:
  Within the framework of an isospin-dependent quantum molecular dynamics
model, the zero-range 2-body part of the Skyrme interaction is replaced by a
finite-range Gaussian 2-body interaction. From the transverse momentum analysis
in the reaction of system $^{93}$Nb + $^{93}$Nb at energy of 400 MeV/nucleon
and impact parameter $b$=3 fm, it is shown that the finite-range nuclear force
enhances the transverse momentum of the reaction system and it can partly
replace the momentum dependent part of the nucleon-nucleon interaction.


title: Proton fraction in neutron stars

abstract:
  The proton fraction in ${\sl \beta}$-stable neutron stars is investigated
within the framework of the Skyrme-Hartree-Fock theory using the extended
Skyrme effective interaction for the first time. The calculated results show
that the proton fraction disappears at high density, which implies that the
pure neutron matter may exist in the interior of neutron stars. The
incompressibility of the nuclear equation of state is shown to be more
important to determine the proton fraction. Meanwhile, it is indicated that the
addition of muons in neutron stars will change the proton fraction. It is also
found that the higher-order terms of the nuclear symmetry energy have obvious
effects on the proton fraction and the parabolic law of the nuclear symmetry
energy is not enough to determine the proton fraction.


title: Coupled Dyson-Schwinger Equations and Effects of Self-Consistency

abstract:
  Using the $\sigma -\omega$ model as an effective tool, the effects of
self-consistency are studied in some detail. A coupled set of Dyson-Schwinger
equations for the renormalized baryon and meson propagators in the $\sigma
-\omega$ model is solved self-consistently according to the dressed
Hartree-Fock scheme, where the hadron propagators in both the baryon and meson
self-energies are required to also satisfy this coupled set of equations. It is
found that the self-consistency affects the baryon spectral function
noticeably, if only the interaction with $\sigma$ mesons is considered.
However, there is a cancellation between the effects due to the $\sigma$ and
$\omega$ mesons and the additional contribution of $\omega$ mesons makes the
above effect insignificant. In both the $\sigma$ and $\sigma -\omega$ cases the
effects of self-consistency on meson spectral function are perceptible, but
they can nevertheless be taken account of without a self-consistent
calculation. Our study indicates that to include the meson propagators in the
self-consistency requirement is unnecessary and one can stop at an early step
of an iteration procedure to obtain a good approximation to the fully
self-consistent results of all the hadron propagators in the model, if an
appropriate initial input is chosen. Vertex corrections and their effects on
ghost poles are also studied.


title: Test of phi renormalization in nuclei through phi photoproduction

abstract:
  We propose an experimental procedure to find out the medium modifications of
the $\phi$ meson. The reaction is inclusive $\phi$ photoproduction in nuclei,
looking for $K^+ K^-$ pairs from the $\phi$ decay with total momentum smaller
than 100-150 $MeV/c$, which are made possible at energies of present
laboratories from center of mass $\phi$ backward production and the help of
Fermi motion. We have conducted a many body calculation of the mass
distribution of the $\phi$ adapted to the experimental set up of a recent JLAB
experiment where the backwards $\phi$ photoproduction has been measured. Using
recent results for the in medium properties of the $\phi$, we find that the
width of the invariant mass distribution for photoproduction on medium to heavy
nuclei is larger than the free $\phi$ width by a factor of two or more.


title:
Microscopic systems with and without Coulomb interaction, fragmentation
  and phase transitions in finite nuclei

abstract:
  We test the influence of the Coulomb interaction on the thermodynamic and
cluster generation properties of a system of classical particles described by
different lattice models. Numerical simulations show that the Coulomb
interaction produces essentially a shift in temperature of quantities like the
specific heat but not qualitative changes. We also consider a cellular model.
The thermodynamic properties of the system are qualitatively unaltered.


title:
Probing meson spectral functions with double differential dilepton
  spectra in heavy-ion collisions

abstract:
  The double differential dilepton spectrum $dN/ (dM_\perp^2 dM^2)$ at fixed
transverse mass $M_\perp$ allows a direct access to the vector meson spectral
functions. Within a fireball model the sensitivity of $dN/ (dM_\perp^2 dM^2)$
against variations of both the in-medium properties of mesons and the dynamics
of the fireball is investigated. In contrast to the integrated invariant-mass
spectrum $dN/dM^2$, in the spectrum $dN/dM^2 dM_\perp^2$ with fixed $M_\perp$
the $\omega$ signal is clearly seen as bump riding on the $\rho$ background
even in case of strong in-medium modifications.


title: Hypernuclear Physics with Photons

abstract:
  We review the opportunities and challenges in the field of hypernuclear
physics with electromagnetic probes. An overview is presented regarding our
current understanding of the elementary production process on the nucleon. This
amplitude is then used in the nuclear environment to study the hyperon-nucleon
(YN) interaction. We discuss two scenarios: hypernuclear excitation that allows
the investigation of hypernuclear structure and the bound Lambda in the
nucleus, and quasifree kaon production on the deuteron and on nuclei, which
permits a more direct access to the YN force. Specific examples are given for
few-body systems and shell-model nuclei.


title: The production of charm mesons from quark matter at CERN SPS and RHIC

abstract:
  We study the production of charm mesons and other charm baryons from quark
matter at CERN SPS and RHIC energies. Using quark coalescence models as
hadronization mechanism, we predict particle ratios, absolute yields and
transverse momentum spectra.


title:
A renormalized equation for the three-body system with short-range
  interactions

abstract:
  We study the three-body system with short-range interactions characterized by
an unnaturally large two-body scattering length. We show that the off-shell
scattering amplitude is cutoff independent up to power corrections. This allows
us to derive an exact renormalization group equation for the three-body force.
We also obtain a renormalized equation for the off-shell scattering amplitude.
This equation is invariant under discrete scale transformations. The
periodicity of the spectrum of bound states originally observed by Efimov is a
consequence of this symmetry. The functional dependence of the three-body
scattering length on the two-body scattering length can be obtained
analytically using the asymptotic solution to the integral equation. An
analogous formula for the three-body recombination coefficient is also
obtained.


title:
Nuclear matter properties in the relativistic mean field model with
  sigma-omega coupling

abstract:
  The possibility of extending the linear sigma-omega model by introducing a
sigma-omega coupling phenomenologically is explored. It is shown that, in
contrast to the usual Walecka model, not only the effective nucleon mass M* but
also the effective sigma meson mass m*_sigma and the effective omega meson mass
m*_omega are nucleon density dependent. When the model parameters are fitted to
the nuclear saturation point (the nuclear radius constant r_0=1.14fm and volume
energy a_1=16.0MeV) as well as to the effective nucleon mass M*=0.85M, the
model yields m*_sigma=1.09m_sigma and m*_omega=0.90m_omega at the saturation
point, and the nuclear incompressibility K_0=501MeV. The lowest value of K_0
given by this model by adjusting the model parameters is around 227MeV.


title:
Do chemically saturated antihyperon abundancies signal the quark gluon
  plasma?

abstract:
  We first review the production and the possible chemical equilibration of
strange particles at CERN-SPS energies within a microscopic hadronic transport
calculation. It is shown in particular that the strange quarks are produced
initially via string excitations in the primary, secondary and ternary
interactions. We then further elaborate on a recent idea of antihyperon
production by multi-mesonic reactions like $n_1\pi + n_2 K \to \bar{Y}+p $
corresponding to the inverse of the strong binary baryon-antibaryon
annihilation process. It is argued that by these reactions the (rare)
antihyperons are driven towards local chemical equilibrium with pions, nucleons
and kaons on a timescale of 1--3 fm/c in the still moderately baryon-dense
initial hadronic environment after the termination of the prehadronic string
phase. Accordingly this mechanism can provide a convenient explanation for the
antihyperon yields at CERN-SPS energies without any need of a deconfined quark
gluon plasma phase.


title: Low energy scattering and photoproduction of $\eta$-mesons on deuterons

abstract:
  Photo-production of $\eta$-mesons and their collisions with light nuclei are
studied within the Alt-Grassberger-Sandhas (AGS) formalism for different
parameters of $\eta N$ interaction. A three-body resonance or a quasi-bound
state is found close to the $\eta d$ threshold. Expected manifestation of this
resonant behavior of $\eta d$ elastic scattering in various processes involving
$\eta d$-system in their final states was found in calculations of the $\gamma
d \to \eta d$ reaction in the framework of modified AGS equations. These
calculations revealed peaks in the energy dependence of the total cross-section
almost at the same energies as in the elastic $\eta d$ scattering. Meanwhile,
such peaks did not appear in the impulse approximation (i.e. when $\eta d$
resonance was not taken into account). This sheds some light on the nature of
the enhancement of $\eta$ photo-production on deuteron observed recently in the
low energy experiments.


title:
A modified connection between the mass and time in the principle of
  relativity

abstract:
  A simple connection between mass M of a particle or a body and time t is
proposed. The flow of time t depends on the relativechange of mass, i.e
\frac{\Delta M}{M}=- \mu dt, where \mu is unknown parameter. Some of the
simplest consequences from proposed dependence are discussed below.


title: Dynamical interpretation of chemical freeze-out in heavy ion collisions

abstract:
  It is demonstrated that there exists a direct correlation between chemical
freeze-out point and the softest point of the equation of state where the
pressure divided by the energy density, $p(\epsilon)/\epsilon$, has a minimum.
A dynamical model is given as an example where the passage of the softest point
coincides with the condition for chemical freeze-out, namely an average energy
per hadron $\approx$ 1 GeV. The sensitivity of the result to the equation of
state used is discussed.


title:
A complete set of total cross sections for imaginary parts of nd forward
  scattering amplitudes and three-nucleon force effects

abstract:
  In the neutron-deuteron scattering, four total cross sections are shown to
form a complete set for the determination of the imaginary parts of the forward
amplitudes because of the optical theorem. The amplitudes are decomposed into
scalar and tensor ones in the spin space. Contributions of three-nucleon forces
(3NF) to these amplitudes are studied, by the Faddeev calculation, which
predicts significant tensor effects of the 3NF.


title: Experimental Signatures of Anomaly Induced DCC Formation

abstract:
  We discuss characteristic experimental signatures related to the formation of
domains of disoriented chiral condensate (DCC) triggered by the axial anomaly
in relativistic heavy ion collisions. We predict that the enhancement of the
fraction of neutral pions compared to all pions depends on the angle of
emission with respect to the scattering plane and is concentrated at small
transverse momentum and small rapidity in the center-of-mass frame. The
anisotropy with respect to the reaction plane is also observable in the
inclusive photon distribution.


title: Low Mass Dileptons from Pb+Au Collisions at CERN SPS

abstract:
  We show that the dilepton spectra measured by the CERES collaboration in Pb +
Au interactions for various charge multiplicities can be reproduced by a
hadronic initial state with reduction in the masses of the vector mesons in the
thermal bath. Though such an effect may also be achieved by a large broadening
of the spectral function we show that the photon spectra is insensitive to
this. It is found that for higher multiplicities a good description of the data
can also be obtained with quark gluon plasma initial state if the reduction of
the vector meson masses in the mixed and hadronic phases is taken into account.
We observe that a thermal source with initial temperature ~ 200 MeV can
reproduce the observed enhancement in the low mass region of the dilepton
spectra. It is not possible to state which one of the two initial states (QGP
or hadronic) is compatible with the data. These findings are in agreement with
our earlier results obtained from the analysis of the WA98 photon spectra. We
estimate the number of pion-pion collisions near the rho-peak of the dilepton
spectra and argue that thermal equilibrium may have been achieved in the
system, justifying the use of hydrodynamical model to describe the space time
evolution.


title: Asymmetric nuclear matter in a Hartree-Fock approach to non-linear QHD

abstract:
  The Equation of State (EOS) for asymmetric nuclear matter is discussed
starting from a phenomenological hadronic field theory of Serot-Walecka type
including exchange terms. In a model with self interactions of the scalar
sigma-meson we show that the Fock terms naturally lead to isospin effects in
the nuclear EOS. These effects are quite large and dominate over the
contribution due to isovector mesons. We obtain a potential symmetry term of
"stiff" type, i.e. increasing with baryon density and an interesting behaviour
of neutron/proton effective masses of relevance for transport properties of
asymmetric dense matter.


title: Parity-Violating Electron-Deuteron Scattering

abstract:
  The longitudinal asymmetry due to $Z^0$ exchange is calculated in
quasi-elastic electron-deuteron scattering at momentum transfers $|Q^2| \simeq
0.1$ GeV$^2$ relevant for the SAMPLE experiment. The deuteron and $pn$
scattering-state wave functions are obtained from solutions of a Schr\"odinger
equation with the Argonne $v_{18}$ potential. Electromagnetic and weak neutral
one- and two-nucleon currents are included in the calculation. The two-nucleon
currents of pion range are shown to be identical to those derived in Chiral
Perturbation Theory. The results indicate that two-body contributions to the
asymmetry are small ($\simeq$ 0.2%) around the quasi-elastic peak, but become
relatively more significant ($\simeq$ 3%) in the high-energy wing of the
quasi-elastic peak.


title:
The Principle of Relativity and Modified Connection between the Mass of
  a Body and its Velocity: a Case of V>C

abstract:
  Following the basic idea expressed in [1], we assume that for any particle or
body with mass M its own time t depends on therelative change \frac{\Delta
M}{M} of that mass. Based on this assumption, one discusses possible existence
of a hypothetical particles and bodies with a velocity V>C


title:
Decay rates of medium-heavy Lambda-hypernuclei within the Propagator
  Method

abstract:
  The Lambda decay rates in nuclei has been calculated in ref. 1 using the
Propagator Method in Local Density Approximation. We have studied the
dependence of the widths (including the one for the two-body induced process
Lambda NN -> NNN) on the N-N and Lambda-N short range correlations. Using a
reasonable parametrization of these correlations, as well as realistic nuclear
densities and Lambda wave functions, we reproduce, for the first time, the
experimental non-mesonic widths from medium to heavy hypernuclei.


title: Chiral approach to the rho meson in nuclear matter

abstract:
  In this work, the properties of the $\rho$ meson at rest in cold symmetric
nuclear matter are studied. We make use of a chiral unitary approach to
pion-pion scattering in the vector-isovector channel, calculated from the
lowest order Chiral Perturbation Theory ($\chi PT$) lagrangian including
explicit resonance fields. Low energy chiral constraints are considered by
matching our expressions to those of one loop $\chi PT$. To account for the
medium corrections, the $\rho$ couples to $\pi\pi$ pairs which are properly
renormalized in the nuclear medium, accounting for both $p-h$ and $\Delta -h$
excitations. The terms where the $\rho$ couples directly to the hadrons in the
$p-h$ or $\Delta -h$ excitations are also accounted for. In addition, the
$\rho$ is also allowed to couple to $N^{*}(1520)-h$ components.


title: Nuclear Molecular Halo: Threshold Effect or Soft Dipole in 11Li?

abstract:
  The observation of large E1 strength near threshold in the electromagnetic
dissociation of 11Li poses a fundamental question: Is the large E1 strength due
to the threshold or is it due to a low lying E1 state? Such molecular cluster
states were observed in 18O and in several nuclei near the drip line. We
discuss the nature of the "threshold effect" as well as review the situation in
Molecular (and Particle Physics) where such Molecular States are observed near
the dissociation limit. We suggest that the situation in 11Li is reminiscent of
the argon-benzene molecule where the argon atom is loosely bound by a
polarization (van der Waals) mechanism and thus leads to a very extended object
lying near the dissociation limit. Such states are also suggested to dominate
the structure of mesons [a_0(980), f_0(975)] and baryons [Lambda(1405)] with
proposed Kaon molecular structure (e.g. by Dalitz) near threshold. The
inspection of such states throughout Physics allows us to gain insight into
this phenomenon and suggest that a new collective Molecular Dipole Degree of
Freedom plays a major role in the structure of hadrons (halo nuclei, mesons and
baryons), and that quantitative tools such as the E1 Molecular Sum Rule are
useful for elucidating the nature of the observed low lying E1 strength in halo
nuclei.


title: Finite temperature amplitudes and reaction rates in Thermofield dynamics

abstract:
  We propose a method for calculating the reaction rates and transition
amplitudes of generic process taking place in a many body system in
equilibrium. The relationship of the scattering and decay amplitudes as
calculated in Thermo Field Dynamics the conventional techniques is established.
It is shown that in many cases the calculations are relatively easy in TFD.


title: On the Structure of Low Lying 0^{+} Excited States of Pt isotopes

abstract:
  The description of the of nuclei energy spectra of 0^{+} states has been done
involving the degree of their collectivity as a systematics parameter. Within
the framework of this approach the parameter of the collectivity is mainly
determined by pairs of particles placed on single ''effective'' level and
coupled to monopole bosons. Holshtein-Primakoff transformation of these
monopole bosons leads to clear physical explanation of the structure of 0^{+}
states in terms of ''ideal bosons''. The results may be helpful both for
experimentalists and theorists in their investigations of low- lying states
structure and transition probabilities.


title: The inclusive reaction d(\gamma,\pi)NN in the first resonance region

abstract:
  Inclusive single pion photoproduction on the deuteron is studied in the first
resonance region. The calculation is based on the use of the diagrammatic
approach. Pole diagrams and one-loop diagrams with NN rescattering in the final
state are taken into account. The elementary operator for pion photoproduction
from the nucleon is taken in on-shell form and calculated using the SAID and
MAID multipole analyses. Our predictions for total and differential cross
section show good agreement with the available experimental data. Invoking some
information on the reactions $gamma d\to\pi^0 d and $\gamma d\to np$ we predict
the total photoabsorption cross section for deuterium. We find that our results
overestimate the experimental data in the center of the \Delta-peak (\sim 320
MeV) by about 10%.


title: Quantum Calculation of Dipole Excitation in Fusion Reaction

abstract:
  The excitation of the giant dipole resonance by fusion is studied with N/Z
asymmetry in the entrance channel. the TDHF solution exhibits a strong dipole
vibration which can be associated with a giant vibration along the main axis of
a fluctuating prolate shape. The consequences on the gamma-ray emission from
hot compound nuclei are discussed.


title:
Hartree-Fock-Bogoliubov Calculations of the Rotational Band of the Very
  Heavy $^{254}$No Nucleus

abstract:
  We report on Hartree-Fock-Bogoliubov (HFB) calculations of the ground-state
rotationnal band of the heavy nucleus $^{254}$No recently observed
experimentally. The calculated quadrupole deformation is consistent with the
experimental value of $\beta=0.27$ and is almost constant over the whole band.
We also reproduce fairly well the excitation spectra and moments of inertia of
this isotope up to the maximal experimentally observed state of spin 20. The
rather high stability of this nucleus against fission is illustrated by the
deformation energy curve providing very high fission barriers at zero spin
within the HFB and HFB plus Lipkin-Nogami formalisms. The variation of these
barriers with increased angular velocities is also studied.


title:
The Original Mixed Symmetry States - $6^{+}_{1}$ and $6^{+}_{2}$ in
  $^{48}$Ti

abstract:
  The $6^{+}_{1}$ and $6^{+}_{2}$ in $^{48}$Ti form a nearly degenerate
doublet. In a single j shell calculation with the matrix elements from
experiment the $6^{+}_{1}$ changes sign under the interchange of protons and
neutron holes (odd signature) while the $6_{2}^{+}$ does not (even signature).
As a consequence the calculated B(E2) $6_{1}^{+}\to 4_{1}^{+}$ is much stronger
than the $6_{2}^{+}\to 4_{1}^{+}$ and the Gamow-Teller matrix element to the
$6_{2}^{+}$ state vanishes. When using some popular interaction e.g. FPD6 in
single j shell the ordering of the even signature and odd signature states gets
reversed, so that the Gamow-Teller matrix element to the $6^{+}_{1}$ state
vanishes and the $6_{2}^{+}\to 4_{1}^{+}$ E2 transition is the strong one. When
configuration mixing is introduced, the E2 transition $6_{2}^{+}\to 4_{1}^{+}$
persists in being large. However the Gamow-Teller strengths reverse, with the
large matrix element to the $6_{1}^{+}$ state in agreement with experiment.
Static properties $\mu$ and Q for the two $6^{+}$ states are also considered.
The experimental B(E2)'s from the $6^{+}$ states to the $4_{1}^{+}$ state are
not well known.


title: Mid-rapidity charge distribution in peripheral heavy ion collisions

abstract:
  The charge density distribution with respect to the velocity of matter
produced in peripheral heavy ion reactions around Fermi energy is investigated.
The experimental finding of enhancement of mid-rapidity matter shows the
necessity to include correlations beyond BUU which was performed in the
framework of nonlocal kinetic theory. Different theoretical improvements are
discussed. While the in-medium cross section changes the number of collisions,
it leaves the transferred energy almost unchanged. In contrast the nonlocal
scenario changes the energy transferred during collisions and leads to an
enhancement of mid-rapidity matter. The renormalisation of quasiparticle
energies can be included in nonlocal scenarios and leads to a further
enhancement of mid-rapidity matter distribution. This renormalisation is
accompanied by a dynamical softening of the equation of state seen in longer
oscillation periods of the excited compressional collective mode. We propose to
include quasiparticle renormalisation by using the Pauli-rejected collisions
which circumvent the problem of backflows in Landau theory. Using the maximum
relative velocity of projectile and target like fragments we associate
experimental events with impact parameters of the simulations. For peripheral
collisions we find a reasonable agreement between experiment and theory. For
more central collisions, the velocity damping is higher in one-body simulations
than observed experimentally, because of missing cluster formations in the
kinetic theory used.


title: The structure of lambda hypernuclei

abstract:
  The density dependent relativistic hadron field theory is extended to also
describe strange systems. It is seen that the application to hypernuclei works
extremely well. Important spin orbit effects in lambda hypernuclei are studied
and their experimental relevance is pointed out.


title: Macroconstraints from Microsymmetries of Macrosystems

abstract:
  The dynamics governing the evolution of a many body system is constrained by
a nonabelian local symmetry. We obtain a general form of the global macroscopic
conditions assuring that at the microscopic level the evolution respects the
overall symmetry constraint. These conditions does not depend on detailed
dynamics of the system. It is shown that a nonabelian internal symmetry leads
to the new subsidiary condition imposed on the system. A structure of
constraints is analysed.


title: QGP fireball explosion

abstract:
  We identify the major physics milestones in the development of strange
hadrons as an observable for both the formation of quark-gluon plasma, and of
the ensuing explosive disintegration of deconfined matter fireball formed in
relativistic heavy ion collisions at 160--20A GeV. We describe the physical
properties of QGP phase and show agreement with the expectations based on an
analysis of hadron abundances. We than also demonstrate that the m_t shape of
hadron spectra is in qualitative agreement with the sudden breakup of a
supercooled QGP fireball.


title: Baryon-Rich Quark-Gluon Plasma in Nuclear Collision

abstract:
  The maximum achievable temperature (energy density) and minimum kinetic
energy required for the formation of a baryon-rich quark-gluon plasma formed at
central rapidity in small impact parameter nuclear collisions is estimated. A
possible mechanism leading to the pile-up of matter is introduced. Plasma
formation is expected to appear at about 15 GeV/Nucleon uranium beam energy on
a stationary target or 2.7 GeV/Nucleon in colliding beams.


title: Kaon production at subthreshold and threshold energies

abstract:
  We summarize what we have learnt about the kaon production in nucleus-nucleus
collisions in the last decade. We will address three questions: a) Is the $K^+$
production sensitive to the nuclear equation of state? b) How can it happen
that at the same excess energy the same number of $K^+$ and $K^-$ are produced
in heavy ion collisions although the elementary cross section in pp collisions
differs by orders of magnitudes? and c) Why kaons don't flow?


title: Hyperon effects on the properties of $\beta$-stable neutron star matter

abstract:
  We present results from Brueckner-Hartree-Fock calculations for
$\beta$-stable neutron star matter with nucleonic and hyperonic degrees of
freedom employing the most recent parametrizations of the baryon-baryon
interaction of the Nijmegen group. Only $\Sigma^-$ and $\Lambda$ are present up
to densities $\sim 7\rho_0$. The corresponding equations of state are then used
to compute properties of neutron stars such as masses and radii.


title: Ground state correlations and anharmonicity of vibrations

abstract:
  A consistent treatment of the ground state correlations beyond the random
phase approximation including their influence on the pairing and phonon-phonon
coupling in nuclei is presented. A new general system of nonlinear equations
for the quasiparticle phonon model (QPM) is derived. It is shown that this
system contains as a particular case all equations derived for the QPM early.
New additional Pauli principle corrections resulting in the anharmonical shifts
of energies of the two-phonon configurations are found. A correspondence
between the generalized QPM equations and the nuclear field theory is
discussed.


title: The Isospin Asymmetry in the Pseudo-spin Dynamical Symmetry

abstract:
  Pseudo-spin symmetry in nuclei is investigated considering the Dirac equation
with a Lorentz structured Woods-Saxon potential. The isospin correlation of the
energy splittings of pseudo-spin partners with the nuclear potential parameters
is studied. We show that in an isotopic chain, the pseudo-spin symmetry is
better realized for neutrons than for protons. This behavior comes from balance
effects amongst the central nuclear potential parameters. In general, we found
an isospin asymmetry of the nuclear pseudo-spin interaction, opposed to the
nuclear spin-orbit interaction which is quasi isospin symmetric.


title:
Comment on "Complete One-Loop Analysis of the Nucleon's Spin
  Polarisabilities"

abstract:
  We comment on the paper of Gellas et al, nucl-th/0002027, in which heavy
baryon chiral perturbation theory results for the spin polarisabilities of the
nucleon are given. That paper uses a definition which is different from the one
used in papers by us, hep-ph/9908526, hep-ph/9909442 and hep-ph/0002133. In
this comment we show that it is the latter definition, and not that of Gellas
et al, that should be compared with the values of the polarisabilities
extracted from dispersion relation analyses.


title: Statistical Multifragmentation in Thermodynamic Limit

abstract:
  An exact analytical solution of the statistical multifragmentation model is
found in thermodynamic limit. The model exhibits a 1-st order phase transition
of the liquid-gas type. The mixed phase region of the phase diagram, where the
gas of nuclear fragments coexists with the infinite liquid condensate, is
unambiguously identified. The peculiar thermodynamic properties of the model
near the boundary between the mixed phase and the pure gaseous phase are
studied. The results for the caloric curve and specific heat are presented and
a physical picture of the nuclear liquid-gas phase transition is clarified.


title: Microscopic structure of fundamental excitations in N=Z nuclei

abstract:
  Excitation energies of the $T$=1 states in even-even as well as $T$=0 and
$T$=1 states in odd-odd $N$=$Z$ nuclei are calculated within the mean-field
approach. It is shown that the underlying structure of these states can be
determined in a consistent manner only when both isoscalar and isovector
pairing collectivity as well as isospin projection, treated within the
iso-cranking approximation, are taken into account. In particular, in odd-odd
$N$=$Z$ nuclei, the interplay between quasiparticle excitations (relevant for
the case of $T$=0 states) and iso-rotations (relevant for the case of $T$=1
states) explains the near-degeneracy of these fundamental excitations.


title:
Charge symmetry breaking of the nucleon-nucleon interaction:
  $\rho$-$\omega$ mixing VERSUS nucleon mass splitting

abstract:
  We investigate three models for the charge symmetry breaking (CSB) of the
nucleon-nucleon ($NN$) interaction (based upon $\rho$-$\omega$ mixing, nucleon
mass splitting, and phenomenology) that all reproduce the empirical value for
the CSB of the $^1S_0$ scattering length ($\Delta a_{CSB}$) accurately. We
reveal that these models make very different predictions for CSB in $^3P_J$
waves and examine the impact of this on some observable quantities of $A\geq 3$
nuclear systems. It turns out that the $^3$H-$^3$He binding energy difference
is essentially ruled by $\Delta a_{CSB}$ and not very sensitive to CSB from $P$
waves. However, the Coulomb displacement energies (which are the subject of the
Nolen-Schiffer anomaly) receive about 50% of their CSB contribution from $NN$
partial waves beyond $^1S_0$. Consequently, the predictions by the various CSB
models differ here substantially (10-20%). Unfortunately, the evaluation of the
leading Coulomb contributions carry a large uncertainty such that no
discrimination between the competing CSB models can presently be made. To
decide the issue we suggest to look into nuclear few-body reactions that are
sensitive to CSB of the nuclear force.


title: Flow at the SPS and RHIC as a Quark Gluon Plasma Signature

abstract:
  Radial and elliptic flow in non-central heavy ion collisions can constrain
the effective Equation of State(EoS) of the excited nuclear matter. To this
end, a model combining relativistic hydrodynamics and a hadronic transport
code(RQMD [17]) is developed. For an EoS with a first order phase transition,
the model reproduces both the radial and elliptic flow data at the SPS. With
the EoS fixed from SPS data, we quantify predictions at RHIC where the Quark
Gluon Plasma(QGP) pressure is expected to drive additional radial and elliptic
flow. Currently, the strong elliptic flow observed in the first RHIC
measurements does not conclusively signal this nascent QGP pressure. Additional
measurements are suggested to pin down the EoS.


title: Charged particle rapidity distributions at RHIC

abstract:
  Using a multiphase transport model (AMPT), which includes both initial
partonic and final hadronic interactions, we study the rapidity distributions
of charged particles such as protons, antiprotons, pions, and kaons in heavy
ion collisions at RHIC. The theoretical results for the total charged particle
multiplicity at midrapidity are consistent with those measured by the PHOBOS
collaboration in central Au+Au collisions at $\sqrt s$ = 56 and 130 AGeV. We
find that these hadronic observables are much more sensitive to the hadronic
interactions than the partonic interactions.


title: The beta-beta two neutrino decay in 48Ca

abstract:
  A schematic study of the $\beta \beta 2\nu $-decay of $^{48}Ca$ is made in a
shell-model approach. The emphasis is especially put on the role of the
spin-orbit potential in relation with the contribution of other terms in the
strong interaction. This is discussed with a particular attention to the
behavior of these ones under the SU(4) symmetry. Different methods in
calculating the transition amplitude are also looked at with the aim to
determine their reliability and, eventually, why they don't work. Further
aspects relative to the failure of the Operator Expansion Method to reproduce
the results of more elaborate calculations are examined.


title:
Electromagnetic Dissociation as a Tool for Nuclear Structure and
  Astrophysics

abstract:
  Coulomb dissociation is an especially simple and important reaction
mechanism. Since the perturbation due to the electric field of the nucleus is
exactly known, firm conclusions can be drawn from such measurements.
Electromagnetic matrix elements and astrophysical S-factors for radiative
capture processes can be extracted from experiments. We describe the basic
theory, new results concerning higher order effects in the dissociation of
neutron halo nuclei, and briefly review the experimental results obtained up to
now. Some new applications of Coulomb dissociation for nuclear astrophysics and
nuclear structure physics are discussed.


title:
Comparison of Transfer-to-Continuum and Eikonal Models of Projectile
  Fragmentation Reactions

abstract:
  Spectroscopic properties of nuclei are accessible with projectile
fragmentation reactions, but approximations made in the reaction theory can
limit the accuracy of the determinations. We examine here two models that have
rather different approximations for the nucleon wave function, the target
interaction, and the treatment of the finite duration of the reaction. The
nucleon-target interaction is treated differently in the eikonal and the
transfer-to-continuum model, but the differences are more significant for light
targets. We propose a new parameterization with that in mind. We also propose a
new formula to calculate the amplitude that combines the better treatment of
the wave function in the eikonal model with the better treatment of the target
interaction in the transfer-to-continuum model.


title: Dibaryons as canonically quantized biskyrmions

abstract:
  The characteristic feature of the ground state configuration of the Skyrme
model description of nuclei is the absence of recognizable individual nucleons.
The ground state of the skyrmion with baryon number 2 is axially symmetric, and
is well approximated by a simple rational map, which represents a direct
generalization of Skyrme's hedgehog ansatz for the nucleon. If the Lagrangian
density is canonically quantized this configuration may support excitations
that lie close and possible below the threshold for pion decay, and therefore
describe dibaryons. The quantum corrections stabilize these solutions, the mass
density of which have the correct exponential fall off at large distances.


title: CEM2k - Recent Developments in CEM

abstract:
  Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions
are briefly described. These changes are motivated by new data on isotope
production measured recently in "reverse kinematics" at GSI for interactions of
208-Pb and 238-U at 1 GeV/nucleon and 197-Au at 800 MeV/nucleon with liquid
1-H. This study leads us to CEM2k, which is a new version of the CEM code that
is still under development. The increased accuracy and predictive power of the
code CEM2k are shown by several examples. Further necessary work is outlined.


title: Peripheral Collisions of Relativistic Heavy Ions

abstract:
  The physics of peripheral collisions with relativistic heavy ions (PCRHI) is
reviewed. One- and two-photon processes are discussed.


title: 7-Li(p,n) Nuclear Data Library for Incident Proton Energies to 150 MeV

abstract:
  We describe evaluation methods that make use of experimental data, and
nuclear model calculations, to develop an ENDF-formatted data library for the
reaction p + Li7 for incident protons with energies up to 150 MeV. The
important 7-Li(p,n_0) and 7-Li(p,n_1) reactions are evaluated from the
experimental data, with their angular distributions represented using Lengendre
polynomial expansions. The decay of the remaining reaction flux is estimated
from GNASH nuclear model calculations. The evaluated ENDF-data are described in
detail, and illustrated in numerous figures. We also illustrate the use of
these data in a representative application by a radiation transport simulation
with the code MCNPX.


title: Rearranging Pionless Effective Field Theory

abstract:
  We point out a redundancy in the operator structure of the pionless effective
field theory which dramatically simplifies computations. This redundancy is
best exploited by using dibaryon fields as fundamental degrees of freedom. In
turn, this suggests a new power counting scheme which sums range corrections to
all orders. We explore this method with a few simple observables: the deuteron
charge form factor, n p -> d gamma, and Compton scattering from the deuteron.
Higher dimension operators involving electroweak gauge fields are not
renormalized by the s-wave strong interactions, and therefore do not scale with
inverse powers of the renormalization scale. Thus, naive dimensional analysis
of these operators is sufficient to estimate their contribution to a given
process.


title:
A Possible Boson Realization of Generalized Lipkin Model for
  Many-Fermion System

abstract:
  On the basis of the formalism proposed by three of the present authors (A.K.,
J.P.and M.Y.), generalized Lipkin model consisting of (M+1) single-particle
levels is investigated. This model is essentially a kind of the
su(M+1)-algebraic model and, in contrast to the conventional treatment, the
case, where fermions are partially occupied in each level, is discussed. The
scheme for obtaining the orthogonal set for the irreducible representation is
presented.


title: Quark model approach to the $\eta$ meson electroproduction on the proton

abstract:
  A recently developed quark model approach to pseudoscalar meson
photoproduction is extended to electroproduction process for the $\eta$ meson
in the kinematics of momentum transfer $Q^2 \leq$ 4 (GeV/c)$^2$ and total
center of mass energy $W \leq$ 1.6 GeV. Existing data are well reproduced and
the roles of the $S_{11}(1535)$ and $D_{13}(1520)$ resonances are closely
investigated. In the study of the longitudinal excitation of the $S_{11}(1535)$
resonance, a reliable constraint on the $S_{11}(1535)$ properties is obtained
by cleanly removing the electromagnetic transition from the $\gamma_{(v)} p \to
S_{11}(1535) \to \eta p$ amplitude. Thus, the fitted quantities can be
determined with an uncertainty of about 15%. This could be the first direct
constraint on the $S_{11}(1535)$ properties in theory.


title: $\eta^\prime$ photoproduction near threshold

abstract:
  In this work, the $\eta^\prime$ meson photoproduction near threshold is
studied in the quark model framework. A pseudovector effective Lagrangian is
introduced for the $\eta^\prime NN$ coupling and the newly published data from
the SAPHIR Collaboration provide good constraints to this parameter.
Corrections of order $O(1/m_q^2)$ for the electromagnetic interaction vertex
are taken into account, which produce corrections of order $O(1/m_q^3)$ to the
transition amplitude for $\gamma p\to \eta^\prime p$. Some low-lying
resonances, $S_{11}(1535)$, $P_{13}(1720)$, and $P_{13}(1900)$ are found to
have significant contributions. A bump structure around $E_\gamma\approx$ 2 GeV
is found arising from the $n=3$ terms in the harmonic oscillator basis. The
beam polarization asymmetries are predicted and can be tested against the
forthcoming data from GRAAL.


title: Low lying $qqqq\bar q$ states in the baryon spectrum

abstract:
  The coupling to light mesons leads to large widths and shifts of the energy
of the excited states in the baryon spectrum from the predictions of the
constituent quark model with three valence quarks. This coupling may be
modelled by admixtures of sea-quark $qqq(q\bar q)^n$ configurations in the
resonances. A schematic flavor and spin dependent interaction model, similar to
the one which reproduces the low lying part of the experimental baryon spectrum
in the valence quark model, is shown to bring the lowest $qqqq\bar q$ states
with L=1 and positive parity below the states with L=0. Because of the partial
overlap with the corresponding $qqq$ states this suggests that most of the low
lying states in the baryon resonance spectrum have substantial $qqqq\bar q$
admixtures.


title: Statistical evolution of isotope composition of nuclear fragments

abstract:
  Calculations within the statistical multifragmentation model show that the
neutron content of intermediate mass fragments can increase in the region of
liquid-gas phase transition in finite nuclei. The model predicts also
inhomogeneous distributions of fragments and their isospin in the freeze-out
volume caused by an angular momentum and external long-range Coulomb field.
These effects can take place in peripheral nucleus-nucleus collisions at
intermediate energies and lead to neutron-rich isotopes produced in the
midrapidity kinematic region.


title: Calculations of three-body observables in ^8B breakup

abstract:
  We discuss calculations of three-body observables for the breakup of ^8B on a
^{58}Ni target at low energy using the coupled discretised continuum channels
approach. Calculations of both the angular distribution of the ^7Be fragments
and their energy distributions are compared with those measured at several
laboratory angles. In these observables there is interference between the
breakup amplitudes from different spin-parity excitations of the projectile.
The resulting angle and the energy distributions reveal the importance of the
higher-order continuum state couplings for an understanding of the
measurements.


title: Trouble in Asymptopia---the Hulthen Model on the Light Front

abstract:
  We use light-front dynamics to calculate the electromagnetic form-factor for
the Hulthen model of the deuteron. For small momentum transfer Q^2 < 5 GeV^2
the relativistic effects are quite small. For Q^2 = 11 GeV^2 there is about a
13% discrepancy between the relativistic and non-relativistic approaches. For
asymptotically large momentum transfer, however, the light-front form factor,
log Q^2 /Q^4, markedly differs from the non-relativistic version, 1/Q^4. This
behavior is also present for any wave function, such as those obtained from
realistic potential models, which can be represented as a sum of Yukawa
functions. Furthermore, the asymptotic behavior is in disagreement with the
Drell-Yan-West relation. We investigate precisely how to determine the
asymptotic behavior and confront the problem underlying troublesome form
factors on the light front.


title: At the extremes of nuclear charge and spin

abstract:
  Using scaling rules valid in the liquid drop model of nuclei, as well as
universal rules associated with exchanges of stability in families of
equilibrium configurations, we constructed closed formulae in terms of the
atomic and mass numbers Z and A and the angular momentum L, which represent the
properties of nuclei rotating synchronously (with `rigid' moments of inertia),
as calculated numerically using the Thomas-Fermi model of [5,6]. The formulae
are accurate in the range of mass numbers where the transition to rapidly
elongating triaxial `Jacobi' shapes takes place. An improved set of formulae is
also provided, which takes account of the decreased moments of inertia at low
angular momenta. The formulae should be useful in guiding experimental searches
for the Jacobi transition. In the second part of the paper we discuss
qualitatively some aspects of the dynamics of nucleus-nucleus fusion, and
outline a possible way of estimating cross-sections for the synthesis of
superheavy nuclei.


title:
Cranked relativistic Hartree-Bogoliubov theory: Superdeformation in the
  $A\sim 190$ mass region

abstract:
  A systematic investigation of the yrast superdeformed (SD) rotational bands
in even-even nuclei of the $A\sim 190$ mass region has been performed within
the framework of the cranked relativistic Hartree-Bogoliubov theory. The
particle-hole channel of this theory is treated fully relativistically, while a
finite range two-body force of Gogny type is used in the particle-particle
(pairing) channel. Using the well established parameter sets NL1 for the
Lagrangian and D1S for the Gogny force, very good description of experimental
data is obtained with no adjustable parameters.


title:
Moments of Inertia of Nuclei in the Rare Earth Region: A Relativistic
  versus Non-Relativistic Investigation

abstract:
  A parameter free investigation of the moments of inertia of ground state
rotational bands in well deformed rare-earth nuclei is carried out using
Cranked Relativistic Hartree-Bogoliubov (CRHB) and non-relativistic Cranked
Hartree-Fock-Bogoliubov (CHFB) theories. In CRHB theory, the relativistic
fields are determined by the non-linear Lagrangian with the NL1 force and the
pairing interaction by the central part of finite range Gogny D1S force. In
CHFB theory, the properties in particle-hole and particle-particle channels are
defined solely by Gogny D1S forces. Using an approximate particle number
projection before variation by means of the Lipkin Nogami method improves the
agreement with the experimental data, especially in CRHB theory. The effect of
the particle number projection on the moments of inertia and pairing energies
is larger in relativistic than in non-relativistic theory.


title: Strange Dibaryons in Neutron Stars and in Heavy-Ion Collisions

abstract:
  The formation of dibaryons with strangeness are discussed for the interior of
neutron stars and for central relativistic heavy-ion collisions. We derive
limits for the properties of H-dibaryons from pulsar data. Signals for the
formation of possible bound states with hyperons at BNL's Relativistic
Heavy-Ion Collider (RHIC) are investigated by studying their weak decay
patterns and production rates.


title: Exact solution of the nuclear pairing problem

abstract:
  In many applications to finite Fermi-systems, the pairing problem has to be
treated exactly. We suggest a numerical method of exact solution based on SU(2)
quasispin algebras and demonstrate its simplicity and practicality. We show
that the treatment of binding energies with the use of the exact pairing and
uncorrelated monopole contribution of other residual interactions can serve as
an effective alternative to the full shell-model diagonalization in spherical
nuclei. A self-consistent combination of the exactly treated pairing and
Hartree-Fock method is discussed. Results for Sn isotopes indicate a good
agreement with experimental data.


title: Light Front Nuclear Theory and the HERMES Effect

abstract:
  I discuss the use of light cone variables to compute the nucleonic and
mesonic components of nuclear wave functions. A Lagrangian and its
energy-momentum tensor $T^{^+\mu}$ is used to define the total momentum
operators $P^\mu$. The aim is to use wave functions, expressed in terms of
plus-momentum variables, which are used to analyze high energy experiments such
as deep inelastic scattering, Drell-Yan production, (e,e') and (p,p')
reactions. We discuss infinite nuclear matter within the mean field
approximation; finite nuclei using the mean field approximation;
nucleon-nucleon scattering, within the one boson exchange approximation; and,
infinite nuclear matter including the effects of two-nucleon correlations.
Standard good results for nuclear saturation properties are obtained, with a
possible improvement in the lowered value, 180 MeV, of the computed nuclear
compressibility. In our approach, manifest rotational invariance emerges at the
end of the calculation. Thus nuclear physics can be done in a manner in which
modern nuclear dynamics can be implemented and symmetries are respected. A
salient feature is that $\omega,\sigma$ and $\pi$ mesons are obtained as
important constituents. These can contribute coherently to enhance nuclear
electroproduction cross sections for longitudinal virtual photons at low $Q^2$,
while depleting the cross section for transverse photons. Thus the recent
HERMES inelastic lepton-nucleus scattering data at low $Q^2$ and small $x$ can
be described using photon-meson and meson-nucleus couplings which are
consistent with constraints obtained from meson decay widths, nuclear
structure, deep inelastic scattering, and lepton pair production data. Our
model makes a variety of testable predictions.


title: Fock-Bargmann space and classic trajectories

abstract:
  In recent years, a new approach to the theory of nuclear reactions leading to
a break-down of the interacting subsytems into various channels has been
developed. This approach was named the Antisymmetrized Molecular Dynamic (AMD),
and its main idea lies in the description of the nucleons by wave packets in
which the antisymmetrization effects (but not other quantum effects) are
accounted for. In the present review, the basic principles of AMD are
illustrated on the examples of simplest nuclear systems, and the results are
compared with those provided by an exact quantum-mechanical description in the
Fock-Bargmann space. The applicability region of AMD is discussed, in
particular, in the cases of systems with discrete spectrum, and a relation
between the classical AMD trajectories and the quantum distributions is
established. At the same time, a new interpretation of Brink orbitals and
Slater determinants built on them as eigenfunctions of the coordinate operator
defined in the Fock-Bargmann space is proposed. It is shown that these
functions form the cluster geometry of nuclear systems.


title: Quark Models of Baryon Masses and Decays

abstract:
  The description of baryon resonance masses and decays in the constituent
quark model is outlined, with emphasis on the potential-model approach combined
with the 3P0 pair-creation model of strong decays. This approach allows the
estimation of branching fractions for baryon states missing in pion nucleon
elastic scattering analyses but expected to be present in electromagnetic
production. Prospects for the discovery of hybrid baryons are discussed. A
subjective list of the most important corrections required to this approach is
presented.


title: Cross sections for nuclide production in 1 GeV proton-irradiated 208-Pb

abstract:
  114 cross sections for nuclide production in a 1.0 GeV proton-irradiated thin
208Pb target have been measured by the direct gamma spectrometry method using a
high-resolution Ge detector. The gamma spectra were processed by the GENIE-2000
code. The ITEP-developed SIGMA code was used together with the PCNUDAT nuclear
decay database to identify the gamma lines and to determine the cross sections.
The 27Al(p,x)22Na reaction was used to monitor the proton flux. Results of a
feasibility study of the auxiliary 27Al(p,x)24Na and 27Al(p,x)7Be monitor
reactions in the 0.07-2.6 GeV proton-energy range are presented as well. Most
of the experimental data have been analyzed by the LAHET (with ISABEL and
Bertini options), CEM95, CEM2k, INUCL, CASCADE, CASCADE/INPE, and YIELDX codes
that simulate hadron-nucleus interactions.


title:
The nucleon and mesons effective masses in the Relativistic Mean-Field
  Theory

abstract:
  Nucleon and meson effective masses in the nonlinear Relativistic Mean - Field
Theory (RMF) introducing a nonlinear omega - rho and sigma coupling motivated
by the Quark Meson Coupling model (QMC) is explored. It is shown that, in
contrast to the usual Walecka model, not only the effective nucleon mass
m_{eff,N} but also the effective sigma, rho meson masses (m_{eff, sigma},
m_{eff, rho}) and the effective omega meson mass m_{eff, omega} are nucleon
density dependent.


title: Size-shrinking of deuterons in very dilute superfluid nuclear matter

abstract:
  It is shown within the strong-coupling BCS approach that, starting from the
zero-density limit of superfluid nuclear matter, with increasing density
deuterons first shrink before they start expanding.


title:
Electromagnetic K+ production on the deuteron with hyperon recoil
  polarization

abstract:
  Photo- and electroproduction processes of K+ on the deuteron are investigated
theoretically. Modern hyperon-nucleon forces as well as an updated kaon
production operator on the nucleon are used. Sizable effects of the
hyperon-nucleon final state interaction are seen in various observables.
Especially the photoproduction double polarization observable C_z is shown to
provide a handle to distinguish different hyperon-nucleon force models.


title: Hydrodynamic analysis of non-central Pb+Pb collisions at 158A GeV

abstract:
  We analyze non-central heavy-ion collisions at the relativistic energy within
a full (3+1) dimensional hydrodynamic model. First, the initial parameters in
the hydrodynamic model are chosen so that we reproduce the experimental data of
both the rapidity distribution and the slope of transverse mass distribution in
central Pb + Pb collisions at 158 $A$ GeV at the CERN SPS. We next study the
validity of the ansatz of wounded nucleon scaling for the initial condition of
the hydrodynamic model through analysis of the rapidity distribution of
negative pions in non-central collisions. Moreover, a simple Monte Carlo method
is introduced to exactly calculate the particle distribution from resonance
decays.


title:
Confinement in the Big Bang and Deconfinement in the Little Bangs at
  CERN-SPS

abstract:
  The evolution of strongly interacting matter during the cosmological
confinement transition is reviewed. Despite of many proposed relics no specific
signal from the rearrangement of quarks and gluons into hadrons has been
identified by observations. In contrast to this, several observables in
heavy-ion collisions at CERN-SPS energies point to the creation of a matter
state near or slightly above deconfinement. We focus here on the analysis of
dileptons and direct photons. Similarities and differences of the Big Bang and
the Little Bang confinement dynamics are elaborated.


title:
Two-body effects in coherent eta-meson photoproduction on the deuteron
  in the region of the S_11(1535) resonance

abstract:
  Coherent $\eta$-meson photoproduction on the deuteron has been studied, where
the emphasis is on the relative importance of two-body contributions from
hadronic rescattering and electromagnetic meson exchange currents besides the
impulse approximation. For the elementary photoproduction amplitude a coupled
resonance model developed by Bennhold and Tanabe has been used which fits
reasonably well the experimental data. The rescattering effects are treated
within a coupled channel approach considering the intermediate excitation of
the $P_{11}(1440)$, $D_{13}(1520)$, and $S_{11}(1535)$ nucleon resonances. The
hadronic interaction between nucleon and resonances is modeled by one boson
exchange potentials, which we have considered both in the static approximation
as well as fully retarded. The sum of all considered two-body effects results
in an enhancement of the total cross section between 10 in the maximum and 25
percent closer to threshold around 680 MeV if the hadronic interaction is
treated retarded. This enhancement shows up in the differential cross sections
mainly at backward angles. It increases steadily from only a few percent at
$0^\circ$ to more than a factor two at $180^\circ$ for a photon energy of 680
MeV. Two-body effects become also significant in certain polarization
observables. Finally, no discrepancy has been found for the ratio of the
isoscalar amplitude to the proton amplitude between coherent and incoherent
$\eta$-photoproduction on the deuteron due to a nonvanishing complex and energy
dependent phase relation.


title: Mass--dependence of the Lambda hypernuclear decay widths

abstract:
  Two different approaches have been employed for the evaluation of the decay
widths of Lambda-hypernuclei (ranging from $^5_{\Lambda}$He to
$^{208}_{\Lambda}$Pb) with the polarization propagator method. In ref.[1], the
two-nucleon stimulated non-mesonic decay, $\Lambda NN\to NNN$, has been
parameterized phenomenologically by means of data on the pion-nucleus optical
potential. The other approach [2] consisted in a fully microscopic description
of the non-mesonic decays through the first order approximation of the
so-called bosonic-loop-expansion. Both calculations reproduce, with
approximately the same accuracy, the experimental decay rates for the whole
range of mass numbers considered.


title:
Momentum distributions and reaction mechanisms for breakup of
  two--neutron halos

abstract:
  A theoretical model able to describe fragmentation reactions of three--body
halo nuclei on different targets, from light to heavy, is used to compute
neutron and core momentum distributions. Both Coulomb and nuclear interactions
are simultaneously included. We specify the different reaction mechanisms
related to various processes. The method is applied to fragmentation of $^6$He
and $^{11}$Li on C and Pb. We find good agreement with the available
experimental results.


title: Hypernuclear Weak Decay Puzzle

abstract:
  A general shell model formalism for the nonmesonic weak decay of the
hypernuclei has been developed. It involves a partial wave expansion of the
emitted nucleon waves, preserves naturally the antisymmetrization between the
escaping particles and the residual core, and contains as a particular case the
weak $\Lambda$-core coupling formalism. The Extreme Particle-Hole Model and the
Quasiparticle Tamm-Dancoff Approximation are explicitly worked out. It is shown
that the nuclear structure manifests itself basically through Pauli Principle,
and a very simple expression is derived for the neutron and proton induced
decays rates, $\Gamma_n$ and $\Gamma_p$, which does not involve the
spectroscopic factors. We use the standard strangeness-changing weak $\Lambda
N\to NN$ transition potential which comprises the exchange of the complete
pseudoscalar and vector meson octets ($\pi,\eta,K,\rho,\omega,K^*$), taking
into account some important parity violating transition operators that are
systematically omitted in the literature. The interplay between different
mesons in the decay of ${^{12}_\Lambda C}$ is carefully analyzed. With the
commonly used parametrization in the One-Meson-Exchange Model (OMEM), the
calculated rate $\Gamma_{NM}= \Gamma_n+\Gamma_p$ is of the order of the free
$\Lambda$ decay rate $\Gamma^0(\Gamma_{NM}^{\rm th}\cong \Gamma^0)$ and is
consistent with experiments. Yet, the measurements of
$\Gamma_{n/p}=\Gamma_n/\Gamma_p$ and of $\Gamma_p$ are not well accounted for
by the theory ($\Gamma_{n/p}^{\rm th}\lsim 0.42; \Gamma_p^{\rm th}\gsim 0.60
\Gamma^0$). It is suggested that, unless additional degrees of freedom are
incorporated, the OMEM parameters should be radically modified.


title: Comment on "Canonical and Mircocanonical Calculations for Fermi Systems"

abstract:
  In the context of nuclear physics Pratt recently investigated noninteracting
Fermi systems described by the microcanonical and canonical ensemble. As will
be shown his discussion of the model of equally spaced levels contains a flaw
and a statement which is at least confusing.


title: Nuclear Pairing in the T=0 channel revisited

abstract:
  Recent published data on the isoscalar gap in symmetric nuclear matter using
the Paris force and the corresponding BHF single particle dispersion are
corrected leading to an extremely high proton-neutron gap of $\Delta \sim 8$
MeV at $\rho \sim 0.5\rho_0$. Arguments whether this value can be reduced due
to screening effects are discussed. A density dependent delta interaction with
cut off is adjusted so as to approximately reproduce the nuclear matter values
with the Paris force.


title: On "Sub-Threshold" Reactions Involving Nuclear Fission

abstract:
  We analyze reactions of several types that are naively below threshold but
can proceed because of the release of binding energy from nuclear fission and
occasionally the formation of Coulombic bound states. These reactions include
(i) photofission with pion production and (ii) charged current neutrino-nucleus
reactions that lead to fission and/or formation of a Coulomb bound state of a
$\mu^-$ with the nucleus of a fission fragment. We comment on the possible
experimental observation of these reactions.


title: Present Status of Realistic Shell-Model Calculations

abstract:
  The present paper is comprised of two parts. First, we give a brief survey of
the theoretical framework for microscopic nuclear structure calculations
starting from a free nucleon-nucleon potential. Then, we present some selected
results of a comprehensive study of nuclei near doubly closed shells. In all
these shell-model calculations we have made use of realistic effective
interactions derived from the Bonn-A nucleon-nucleon potential by means of a
G-matrix folded-diagram method. We show that this kind of calculation yields a
very good agreement with experiment for all the nuclei considered. This leads
to the conclusion that realistic effective interactions are now able to
describe with quantitative accuracy the properties of complex nuclei.


title: Chiral symmetry and meson exchange approach to hypernuclear decay

abstract:
  We take an approach to the $\Lambda$ nonmesonic weak decay in nuclei based on
the exchange of mesons under the guidelines of chiral Lagrangians. The one pion
and one kaon exchange are considered, together with the exchange of two pions,
either correlated, leading to an important scalar-isoscalar exchange
($\sigma$-like exchange), or uncorrelated (box diagrams). A drastic reduction
of the OPE results for the $\Gamma_n/\Gamma_p$ ratio is obtained and the new
results are compatible with all present experiments within errors. The absolute
rates obtained for different nuclei are also in fair agreement with experiment.


title:
Isoscalar Giant Dipole Resonance and Nuclear Matter Incompressibility
  Coefficient

abstract:
  We present results of microscopic calculations of the strength function,
S(E), and alpha-particle excitation cross sections sigma(E) for the isoscalar
giant dipole resonance (ISGDR). An accurate and a general method to eliminate
the contributions of spurious state mixing is presented and used in the
calculations. Our results provide a resolution to the long standing problem
that the nuclear matter incompressibility coefficient, K, deduced from sigma(E)
data for the ISGDR is significantly smaller than that deduced from data for the
isoscalar giant monopole resonance (ISGMR).


title: Elastic Form Factors in Point-form Approach

abstract:
  Using the point-form approach to relativistic quantum mechanics, a covariant
framework is presented for the calculation of proton and neutron
electromagnetic form factors. Results for charge radii, magnetic moments, and
electric as well as magnetic form factors are produced using the wave functions
obtained in the so-called Goldstone-boson-exchange constituent quark model. All
the predictions are found in remarkable agreement with existing experimental
data.


title:
Parity-Violating Pion-Nucleon Coupling h_{\pi NN}^{(1)} from \pi^+
  Electroproton Production Near the Threshold

abstract:
  We study the possibility of measuring parity-violating pion-nucleon coupling
h_{\pi NN}^{(1)} from \pi^+ electroproton production in the threshold region.
We calculate the electron-helicity asymmetry in terms of h_{\pi NN}^{(1)} and
the Z-boson exchange between the electron and proton in leading-order
heavy-baryon chiral perturbation theory. From the result, we demonstrate that
the coupling can be determined to an accuracy of about 2 10^{-7} in an
experiment with incident electron energy 250 MeV, luminosity 10^{38} sec^{-1}
cm^{-2}, and a running time of 10^7 sec.


title:
Ground-state properties and spins of the odd {\boldmath$Z=N+1$} nuclei
  {\boldmath$^{61}$}Ga{\boldmath$-$}{\boldmath$^{97}$}In}

abstract:
  Binding energies, quadrupole deformation parameters, spins and parities of
the neutron-deficient odd $Z=N+1$ nuclei in the $A\sim 80$ region are
calculated in the relativistic mean field approximation. The ground-state and
low-lying configurations of the recently observed $^{77}$Y, $^{79}$Zr and
$^{83}$Mo nuclei are analyzed. The calculated results are compared with other
theoretical predictions.


title:
Probing the nuclear equation of state by $K^+$ production in heavy ion
  collisions

abstract:
  The dependence of $K^+$ production on the nuclear equation of state is
investigated in heavy ion collisions. An increase of the excitation function of
$K^+$ multiplicities obtained in heavy ($Au+Au$) over light ($C+C$) systems
when going far below threshold which has been observed by the KaoS
Collaboration strongly favours a soft equation of state. This observation holds
despite of the influence of an in-medium kaon potential predicted by effective
chiral models which is necessary to reproduce the experimental $K^+$ yields.


title: Shape Transition in Rare-Earth Nuclei in Relativistic Mean Field Theory

abstract:
  A systematic study of the temperature dependence of the shapes and pairing
gaps of some isotopes in the rare-earth region is made in the relativistic
Hartree-BCS theory. Thermal response to these nuclei is always found to lead to
a phase transition from the superfluid to the normal phase at a temperature
$T_{\Delta}\sim 0.4 - 0.8$ MeV and a shape transition from prolate to spherical
shapes at $T_c\sim 1.0 - 2.5$ MeV. These shape transition temperatures are
appreciably higher than the corresponding ones calculated in the
non-relativistic framework with the pairing plus quadrupole interaction. Study
of nuclei with continued addition of neutron pairs for a given isotope shows
that with increased ground state deformation, the transition to the spherical
shape is delayed in temperature. A strong linear correlation between
$T_{\Delta}$ and the ground state pairing gap $\Delta^0$ is observed; a well-
marked linear correlation between $T_c$ and the ground state quadrupole
defromation $\beta_2^{0}$ is also seen. The thermal evolution of the
hexadecapole deformation is further presented in the paper.


title: Fusion rates in nuclear plasmas

abstract:
  Energy and momentum of the elementary excitations become independent
variables in medium: energy and momentum statistical distributions are not
identical. The momentum distribution and not the energy distribution is
relevant for barrier penetration. The deviations of the momentum distribution
from the Maxwell-Boltzmann energy distribution can be expressed in terms of the
imaginary part of the self-energy of the quasi-particle. It is possible to
obtain an effective Tsallis' distribution for the kinetic energy. These effects
are different from static or dynamical screening and can have important
consequences for reaction rates in stars.


title:
Fluctuations of the transverse energy in Pb+Pb collisions and J/psi
  suppression

abstract:
  The observed J/psi suppression in Pb+Pb collisions shows a drop at those
large values of the transverse energy E_T which arise from fluctuations. The
validity of existing models for J/psi suppression can be extended into this
domain of E_T by introducing an ad hoc factor proportional to E_T. We propose a
formalism in which the influence of E_T fluctuations on the J/psi suppression
can be calculated and discuss the conditions under which the ad hoc factor is
obtained.


title:
The pairing Hamiltonian for one pair of nucleons bound in a potential
  well

abstract:
  The problem of one pair of identical nucleons sitting in ${\cal N}$ single
particle levels of a potential well and interacting through the pairing force
is treated introducing, in the Hamiltonian formalism, even Grassmann variables.
The eigenvectors are analytically expressed solely in terms of these with
coefficients fixed by the eigenvalues and the single particle energies. For
these a specific model is needed: in the case of the harmonic oscillator well,
for any strength of the pairing interaction, an accurate expression is derived
for both the collective eigenvalue and for those trapped in between the single
particle levels. Notably the latter are labelled through an index upon which
they depend parabolically.


title: Pion-Lambda-Sigma Coupling Extracted from Hyperonic Atoms

abstract:
  The latest measurements of the atomic level width in Sigma-hyperonic Pb atom
offer the most accurate datum in the region of low-energy Sigma-hyperon
physics. Atomic widths are due to the conversion of Sigma-nucleon into
Lambda-nucleon. In high angular momentum states this conversion is dominated by
the one-pion exchange. A joint analysis of the data of the scattering of
negative-Sigma on proton converting into a Lambda and a neutron and of the
atomic widths allows to extract a pseudovector pion-hyperon-Sigma coupling
constant of 0.048 with a statistical error of +-0.005 and a systematic one of
+-0.004. This corresponds to a pseudoscalar coupling constant of 13.3 with a
statistical uncertainty of 1.4 and a systematic one of 1.1.


title:
Is Anomalous Production of Omega and anti-Omega Evidence for Disoriented
  Chiral Condensates?

abstract:
  No conventional picture of nucleus-nucleus collisions has yet been able to
explain the abundance of Omega and anti-Omega hyperons in central collisions
between Pb nuclei at 158 A GeV at the CERN SPS. We argue that this is evidence
that they are produced as topological defects arising from the formation of
disoriented chiral condensates (DCC) with an average domain size of about 2 fm.


title: Quark model derivation of a NN* (1440) potential

abstract:
  We derive a $NN^*$(1440) potential from a non-relativistic quark-quark
interaction and a chiral quark cluster model for the baryons. By making use of
the Born-Oppenheimer approximation we examine the most important features of
this interaction in comparison to those obtained from meson-exchange models.


title: On Nonlinear Evolution of Axisymmetric Nuclear Surface

abstract:
  We consider an uniformly charged incompressible nuclear fluid bounded by a
closed surface. It is shown that an evolution of an axisymmetric surface
$\Gamma(\bbox{r},t)\equiv \sigma - \Sigma(z,t) = 0,\quad
\bbox{r}=(\sigma,\phi,z)$ can be approximately reduced to a motion of a curve
in the $(\sigma,z)$-plane. A nonlinear integro-diffrerential equation for the
contour $\Sigma(z,t)$ is derived. It is pointed on a direct correspondence
between $\Sigma(z,t)$ and a local curvature, that gives possibility to use
methods of differential geometry to analyze an evolution of an axisymmetric
nuclear surface.


title: On scission configuration in ternary fission

abstract:
  A static scission configuration in cold ternary fission has been considered
in the framework of two mean field approaches. The virial theorems has been
suggested to investigate correlations in the phase space, starting from a
kinetic equation. The inverse mean field method is applied to solve
single-particle Schredinger equation, instead of constrained selfconsistent
Hartree-Fock equations. It is shown, that it is possible to simulate
one-dimensional three-center system via inverse scattering method in the
approximation of reflectless single-particle potentials


title:
Neutrinoless double beta decay within Self-consistent Renormalized
  Quasiparticle Random Phase Approximation and inclusion of induced nucleon
  currents

abstract:
  The first, to our knowledge, calculation of neutrinoless double beta decay
($0\nu\beta\beta$-decay) matrix elements within the self-consistent
renormalised Quasiparticle Random Phase Approximation (SRQRPA) is presented.
The contribution from the momentum-dependent induced nucleon currents to
$0\nu\beta\beta$-decay amplitude is taken into account. A detailed nuclear
structure study includes the discussion of the sensitivity of the obtained
SRQRPA results for $0\nu\beta\beta$-decay of $^{76}$Ge to the parameters of
nuclear Hamiltonian, two-nucleon short-range correlations and the truncation of
the model space. A comparision with the standard and renormalized QRPA is
presented. We have found a considerable reduction of the SRQRPA nuclear matrix
elements, resulting in less stringent limits for the effective neutrino mass.


title:
The d* dibaryon in the extended quark-delocalization, color-screening
  model

abstract:
  The quark-delocalization, color-screening model, extended by inclusion of a
one-pion-exchange (OPE) tail, is applied to the study of the deuteron and the
d* dibaryon. The results show that the properties of the deuteron (an extended
object) are well reproduced, greatly improving the agreement with experimental
data as compared to our previous study (without OPE). At the same time, the
mass and decay width of the d* (a compact object) are, as expected, not altered
significantly.


title: Nucleon resonances in polarized omega photoproduction

abstract:
  The role of the nucleon resonances ($N^*$) in $\omega$ photoproduction is
investigated by using the resonance parameters predicted by Capstick and
Roberts. The contributions from the nucleon resonances are found to be
significant in various spin asymmetries. In particular, we found that a crucial
test of our predictions can be made by measuring the parity asymmetry and
beam-target double asymmetry at forward scattering angles.


title: Chiral symmetry and quantum hadro-dynamics

abstract:
  Using the linear sigma model, we study the evolutions of the quark condensate
and of the nucleon mass in the nuclear medium. Our formulation of the model
allows the inclusion of both pion and scalar-isoscalar degrees of freedom. It
guarantees that the low energy theorems and the constrains of chiral
perturbation theory are respected. We show how this formalism incorporates
quantum hadro-dynamics improved by the pion loops effects.


title:
Microscopic Theory of the Nuclear Equation of State and Neutron Star
  Structure

abstract:
  The Bethe-Brueckner-Goldstone many-body theory of the Nuclear Equation of
State is reviewed in some details. In the theory, one performs an expansion in
terms of the Brueckner two-body scattering matrix and an ordering of the
corresponding many-body diagrams according to the number of their hole-lines.
Recent results are reported, both for symmetric and for pure neutron matter,
based on realistic two-nucleon interactions. It is shown that there is strong
evidence of convergence in the expansion. Once three-body forces are
introduced, the phenomenological saturation point is reproduced and the theory
is applied to the study of neutron star properties. One finds that in the
interior of neutron stars the onset of hyperons strongly softens the Nuclear
Equation of State. As a consequence, the maximum mass of neutron stars turns
out to be at the lower limit of the present phenomenological observation.


title:
Effects of nuclear re-interactions in quasi-elastic neutrino-nucleus
  scattering

abstract:
  The effects of nuclear re-interactions in the quasi-elastic neutrino-nucleus
scattering are investigated with a phenomenological model. We found that the
nuclear responses are lowered and their maxima are shifted towards higher
excitation energies. This is reflected on the total neutrino-nucleus cross
section in a general reduction of about 15% for neutrino energies above 300
MeV.


title: Evidence for Three Nucleon Force Effects in p-d Elastic Scattering

abstract:
  A new measurement of the p-d differential cross section at Ep= 1 MeV has been
performed. These new data and older data sets at energies below the deuteron
breakup are compared to calculations using the two-nucleon Argonne v18 and the
three-nucleon Urbana IX potentials. A quantitative estimate of the capability
of these interactions to describe the data is given in terms of a chi^2
analysis. The chi^2 per datum drastically improves when the three-nucleon
interaction is included in the Hamiltonian.


title: Kaon and Pion Ratio Probes of Jet Quenching in Nuclear Collisions

abstract:
  Non-abelian energy loss in quark gluon plasmas is shown to lead to novel
hadron ratio suppression patterns in ultrarelativistic nuclear collisions. We
apply GLV estimates for the gluon radiative energy loss. The K^-/K^+ and
K^+/\pi^+ ratios are found to be most sensitive to the initial density of the
plasma.


title:
Possibly to Test the Mechanism of Elastic Backward Proton-Deuteron
  Scattering ?

abstract:
  The elastic backward proton-deuteron scattering is analyzed within a
covariant approach based on the invariant expansion of the reaction amplitude.
The relativistic invariant equations for all the polarization observables are
presented. Within the impulse approximation the relation of the tensor
analyzing power $T_{20}$ and the polarization transfer $\kappa_0$ to $P$-wave
components of the deuteron wave function is found. The comparison of the
theoretical calculations with experimental data is presented. An experimental
verification of the reaction mechanism is suggested by constructing some
combinations of different observables.


title:
Final state interaction in inclusive and exclusive quasi-elastic
  processes

abstract:
  We discuss a new approach to final state interactions, that keeps explicitly
into account the virtuality of the ejected nucleon in quasi-elastic $A(e,e'p)X$
scattering at very large $Q^2$, and we present some recent results, at
moderately large $Q^2$ values, for the nuclear transparency in $^4He$, $^{16}O$
and $^{40}Ca$ and for the momentum distributions of $^4He$.


title: Probing chiral dynamics by charged-pion correlations

abstract:
  The environment generated in the mid-rapidity region of a high-energy nuclear
collision endows the pionic degrees of freedom with a time-dependent effective
mass. Its specific evolution provides a mechanism for the production of
back-to-back charge-conjugate pairs of soft pions which may present an
observable signal of the non-equilibrium dynamics of the chiral order
parameter.


title: Relativistic Effects in Electroweak Nuclear Responses

abstract:
  The electroweak response functions for inclusive electron scattering are
calculated in the Relativistic Fermi Gas model, both in the quasi-elastic and
in the $\Delta$ peak regions. The impact of relativistic kinematics at high
momentum transfer is investigated through an expansion in the initial nucleonic
momentum, which is however exact in the four-momentum of the exchanged boson.
The same expansion is applied to the meson exchange currents in the
particle-hole sector: it is shown that the non-relativistic currents can be
corrected by simple kinematical factors to account for relativity. The
left-right asymmetry measured via polarized electron scattering is finally
evaluated in the quasi-elastic and $\Delta$ peaks.


title:
Short-range correlations in nuclear matter using Green's functions
  within a discrete pole approximation

abstract:
  We treat short-range correlations in nuclear matter, induced by the repulsive
core of the nucleon-nucleon potential, within the framework of a
self-consistent Green's function theory. The effective in-medium interaction
sums the ladder diagrams of both the particle-particle and hole-hole type. The
demand of self-consistency results in a set of nonlinear equations which must
be solved by iteration. We explore the possibility of approximating the
single-particle Green's function by a limited number of poles and residues.


title: Diquarks and Density

abstract:
  We describe aspects of the role that diquark correlations play in
understanding baryon structure and interactions. The significance of diquarks
in that application motivates a study of the possibility that dense hadronic
matter may exhibit diquark condensation; i.e., quark-quark pairing promoted by
a quark chemical potential. A Gorkov-Nambu-like gap equation is introduced for
QCD and analysed for 2-colour QCD (QC2D) and, in two qualitatively different
truncations, for QCD itself. Among other interesting features, we illustrate
that QC2D with massive fermions undergoes a second-order transition to a
superfluid phase when the chemical potential exceeds 0.5 m.pi. In the QCD
application we illustrate that the sigma= <bar-q q> .neq. 0 phase, which
determines the properties of the mass spectrum at zero temperature and chemical
potential, is unstable with respect to the superfluid phase when the chemical
potential exceeds approx. 2 sigma, and that at this point the diquark gap is
large, approx. 0.5 sigma. The superfluid phase survives to temperatures greater
than that expected in the core of compact stars.


title: Solution of the Dyson equation for nucleons in the superfluid phase

abstract:
  We investigate the role the interweaving of surface vibrations and nucleon
motion has on Cooper pair formation in spherical superfluid nuclei. A
quantitative calculation of the state-dependent pairing gap requires to go
beyond the quasiparticle approximation, treating in detail the breaking of the
single-particle strength and of the associated poles. This is done solving
self-consistently the Dyson equation, including both a bare nucleon-nucleon
interaction (which for simplicity we choose as a monopole-pairing force of
constant matrix elements g) and an induced interaction arizing from the
exchange of vibrations (calculated microscopically in QRPA) between pairs of
nucleons moving in time reversal states. Both the normal and anomalous density
Green functions are included, thus treating self-energy and pairing processes
on equal footing. We apply the formalism to the superfluid nucleus 120Sn.
Adjusting the value of g so as to reproduce, for levels close to the Fermi
level, the empirical odd-even mass difference (Delta approx 1.4 MeV), it is
found that the pairing gap receives about equal contributions from the
monopole-pairing force and from the induced interaction. [More sentences
continue. See the main body.]


title: Hadron production in nuclear collisions at RHIC and high density QCD

abstract:
  We analyze the first results on charged particle multiplicity at RHIC in the
conventional eikonal approach and in the framework of high density QCD. We
extract the fraction $F$ of the hadron multiplicity originating from ``hard''
(i.e. proportional to the number of binary collisions) processes; we find a
strong growth of this fraction with energy: $F(\sqrt{s}=56 {\rm GeV}) \simeq
22%$, while $F(\sqrt{s}=130 {\rm GeV}) \simeq 37 %$. This indicates a rapid
increase in the density of the produced particles. We outline the predictions
of high density QCD for the centrality, energy, and atomic number dependence of
hadron production. Surprisingly, the predictions of the conventional eikonal
approach and of high density QCD for centrality dependence of hadron
multiplicity at $\sqrt{s}=130 {\rm GeV}$ appear very similar.


title:
Structure and properties of neutron stars in the Relativistic Mean -
  Field Theory

abstract:
  Properties of rotating neutron stars with the use of relativistic mean-field
theory are considered. The performed analysis of neutron star matter is based
on the nonlinear Lgrangian density. The presence of nonlinear interaction of
vector mesons modifies the density dependence of the rho field and influences
bulk parameters of neutron stars. The observed quasi-periodic X-ray
oscillations of low mass X-ray binaries can be used in order to constrain the
equation of state of neutron star matter. Having assumed that the maximum
frequency of the quasi periodic oscillations originates at the circular orbit
it is possible to estimate masses and radii of neutron stars.


title: Effect of nuclear structure on Type Ia supernova nucleosynthesis

abstract:
  The relationship among nuclear structure, the weak processes in nuclei, and
astrophysics becomes quite apparent in supernova explosion and nucleosynthesis
studies. In this brief article, I report on progress made in the last few years
on calculating electron capture and beta-decay rates in iron-group nuclei. I
also report on applications of these rates to Type-Ia nucleosynthesis studies.


title: Bifurcation in kinetic equation for interacting Fermi systems

abstract:
  The finite duration of collisions appear as time-nonlocality in the kinetic
equation. Analyzing the corresponding quantum kinetic equation for dense
interacting Fermi systems a delay differential equation is obtained which
combines time derivatives with finite time stepping known from the logistic
mapping. The responsible delay time is explicitly calculated and discussed. As
a novel feature oscillations in the time evolution of the distribution function
itself appear and bifurcations up to chaotic behavior can occur. The
temperature and density conditions are presented where such oscillations and
bifurcations arise indicating an onset of phase transition.

categories: nucl-th cond-mat.stat-mech cond-mat.str-el nlin.CD physics.plasm-ph quant-ph


title: Equilibration and freeze-out in an exploding system

abstract:
  We use a simple gas model to study non-equilibrium aspects of the
multiparticle dynamics relevant to heavy ion collisions. By performing
numerical simulations for various initial conditions we identify several
characteristic features of the fast dynamics occurring in implosion-explosion
like processes.


title:
Mott effect at the chiral phase transition and anomalous J/Psi
  suppression

abstract:
  We investigate the in-medium modification of the charmonium break-up
processes due to the Mott effect for light (pi) and open-charm (D, D*) mesons
at the chiral/deconfinement phase transition. A model calculation for the
process J/Psi + pi -> D + \bar D* + h.c. is presented which demonstrates that
the Mott effect for the D-mesons leads to a threshold effect in the thermal
averaged break-up cross section. This effect is suggested as an explanation of
the phenomenon of anomalous J/Psi suppression in the CERN NA50 experiment.


title: Constructing Point Form Mass Operators from Interaction Lagrangians

abstract:
  Starting from an interaction Lagrangian formed out of local fields, an
interacting four-momentum operator is constructed by integrating the
interaction Lagrangian over the forward hyperboloid. Such a four-momentum
operator has the property that the components commute among themselves;
however, when the Fock space on which the four-momentum operator acts is
truncated, the components no longer commute among themselves. By modifying
matrix elements of the four-momentum operator on the truncated space,
Bakamjian-Thomas mass operatorsare constructed which restore the Poincare
relations. Examples for a simple Lagrangian are given.


title: Point Form Electrodynamics and the Gupta-Bleuler Formalism

abstract:
  The Gupta-Bleuler formalism for photons is derived from induced
representation theory. The representation for the little group for massless
particles, the two dimensional Euclidian group, is chosen to be the four
dimensional nonunitary representation obtained by restricting elements of the
Lorentz group to the Euclidian group. Though the little group representation is
nonunitary, it is shown that the representation of the Poincar\'{e} group is
unitary. As a consequence of the four dimensional representation, the
polarization vector, which connects the four-vector potential with creation and
annihilation operators, is given in terms of boosts, coset representatives of
the Lorentz group with respect to the Euclidian group. Several polarization
vectors (boost choices) are worked out, including a front form polariation
vector. The different boost choices are shown to be related by the analogue of
Melosh rotations, namely Euclidian group transformations.


title:
Point Form Electrodynamics and the Construction of Conserved Current
  Operators

abstract:
  A general procedure for constructing conserved electromagnetic current
operators, for both finite and infinite degree of freedom systems, is given. A
four-momentum operator consisting of matter, photon, and electromagnetic
interactions is assumed to be polynomial in photon creation and annihilation
operators. Commutators of the four-momentum operator with the four-vector
potential operator at the space-time point zero give the electromagnetic field
tensor and current operator at the space-time point zero. In this construction
there are no equations of motion to be satisfied and field operators at an
arbitrary space-time point-defined as the four-momentum translates of the
corresponding operators at the space-time point zero-are not local operators.
Several examples are given to show how the construction is carried out.


title:
Phase Shifts and Mixing Parameters for Elastic Proton-Deuteron
  Scattering

abstract:
  The eigenphase shifts and mixing parameters for elastic p-d scattering below
the deuteron-breakup threshold are calculated for the AV14 two-body potential
using two different numerical methods. The excellent agreement confirms that it
is possible to perform accurate numerical studies of p-d scattering as well as
n-d scattering for low energies. The numerical results can be considered as
benchmarks for future calculations.