title: pQCD phenomenology of elastic ed scattering

abstract:
  Electron-deuteron elastic scattering data ($A(Q^2)$ and $B(Q^2)$ structure
functions and polarization observables $t_{20}$, $t_{21}$ and $t_{22}$) are fit
with a model that respects asymptotic properties of pQCD at high momentum
transfer. The data analysis shows that pQCD starts from $Q^2=3.5 \rm
(GeV/c)^2$. Predictions for the magnetic structure function $B(Q^2)$ and the
polarization observables at high momentum transfer are given.


title: Bound states of anti-nucleons in finite nuclei

abstract:
  We study the bound states of anti-nucleons emerging from the lower continuum
in finite nuclei within the relativistic Hartree approach including the
contributions of the Dirac sea to the source terms of the meson fields. The
Dirac equation is reduced to two Schr\"{o}dinger-equivalent equations for the
nucleon and the anti-nucleon respectively. These two equations are solved
simultaneously in an iteration procedure.
  Numerical results show that the bound levels of anti-nucleons vary
drastically when the vacuum contributions are taken into account.


title: Femtoscopy with unlike particles

abstract:
  The possibilities of unlike particle correlations for a study of space--time
characteristics of particle production are demonstrated. The correlation data
from heavy ion collisions is discussed, particularly - in terms of the
transport RQMD and hydrodynamic models. An attention is paid to the relative
space-time asymmetries in the production of different particle species,
measured as a ratio of the correlation functions corresponding to different
directional selections of the relative momentum vector. Being sensitive to the
relative time delays and to the intensity of collective flows, these
asymmetries can become a promising tool in a study of the deconfinement
transition and the formation of quark-gluon plasma.


title: Beta-decay in odd-A and even-even proton-rich Kr isotopes

abstract:
  Beta-decay properties of proton-rich odd-A and even-even Krypton isotopes are
studied in the framework of a deformed selfconsistent Hartree-Fock calculation
with density-dependent Skyrme forces, including pairing correlations between
like nucleons in BCS approximation. Residual spin-isospin interactions are
consistently included in the particle-hole and particle-particle channels and
treated in Quasiparticle Random Phase Approximation. The similarities and
differences in the treatment of even-even and odd-A nuclei are stressed.
Comparison to available experimental information is done for Gamow-Teller
strength distributions, summed strengths, and half-lives. The dependence of
these observables on deformation is particularly emphasized in a search for
signatures of the shape of the parent nucleus.


title:
A soft mode in a finite Fermi-system: anharmonic effects near the
  instability point

abstract:
  We consider a finite Fermi-system where the residual interactions create a
soft mode of the excitation spectrum. Because of the large vibrational
amplitude, the standard random phase approximation does not work in this
situation. We develop a regular method for constructing the anharmonic
potential and illustrate the application of the formalism by a simple model.


title:
Randomness and collectivity in nuclear structure: Three theoretical
  puzzles

abstract:
  We show and interpret three examples of nontrivial results obtained in
numerical simulations of many-body systems: exponential convergence of
low-lying energy eigenvalues in the process of progressive truncation of huge
shell-model matrices, apparently ordered spectra generated by random
interactions, and regular behavior of complex many-body energies in a system
with single-particle orbitals in continuum. The possible practical applications
and new approaches are suggested.


title: Two-proton events in the 17F(p,2p)16O reaction

abstract:
  In a recent experimental study (Gomez del Campo et al, PRL 86, 43 (2001)) of
the reaction 17F(p,2p)16O, two-proton events were measured from excitations
near a 1-, E*=6.15 MeV state in 18Ne. We calculate by means of R-matrix theory
the resonant two-proton production cross section and branching ratios. We
conclude that it is unlikely that two-proton production via population of the
1- state is sufficient to explain the observed two-proton events. Alternative
sources of such events are discussed.


title:
Transverse Momentum Spectra of $J/\psi$ and $\psi^{\prime}$ Mesons from
  Quark Gluon Plasma Hadronization at CERN SPS

abstract:
  A popular derivation of the apparent temperature of the particle transverse
momentum spectra and its inconsistency are considered. An improved formula for
the apparent temperature is discussed. It is shown that recent results on
transverse mass spectra of $J/\psi$ and $\psi^{\prime}$ mesons support a
hypothesis of statistical production of charmonia at hadronization and suggest
the early thermal freeze-out of these mesons. Using the apparent temperature
formula the collective transverse velocity of the hadronizing quark gluon
plasma is extracted to be $<v_T > \approx 0.2$. Predictions for transverse mass
spectra of hidden and open charm mesons along with bottomonium at SPS and RHIC
energies are discussed.


title:
Staggering behavior of the low lying excited states of even-even nuclei
  in a Sp(4,R) classification scheme

abstract:
  We implement a high order discrete derivative analysis of the low lying
collective energies of even-even nuclei with respect to the total number of
valence nucleon pairs N in the framework of F- spin multiplets appearing in a
symplectic sp(4,R) classification scheme. We find that for the nuclei of any
given F- multiplet the respective experimental energies exhibit a Delta N=2
staggering behavior and for the nuclei of two united neighboring F- multiplets
well pronounced Delta N=1 staggering patterns are observed. Those effects have
been reproduced successfully through a generalized sp(4,R) model energy
expression and explained in terms of the step-like changes in collective modes
within the F- multiplets and the alternation of the F-spin projection in the
united neighboring multiplets. On this basis we suggest that the observed Delta
N=2 and Delta N=1 staggering effects carry detailed information about the
respective systematic manifestation of both high order alpha - particle like
quartetting of nucleons and proton (neutron) pairing interaction in nuclei.PACS
number(s):21.10.Re, 21.60.Fw


title:
Structure of the inner crust of neutron stars: crystal lattice or
  disordered phase ?

abstract:
  We investigate the inner crust structure of neutron stars using the
Skyrme-Hartree-Fock approach with the Coulomb interaction treated beyond the
Wigner-Seitz approximation. Our results suggest that the shell effects
associated with unbound neutrons play an important role and, in particular,
lead to complicated phase transition pattern between various nuclear phases (as
a function of the density). Namely, we show that the relative energies of
different phases are rapidly oscillating functions of the neutron density. In
the semiclassical approach this behavior is explained as an interference effect
due to periodic orbits of similar lengths. We discuss also the dependence of
the shell effects on pairing correlations.


title: Radiative Muon Capture by He-3

abstract:
  The rate of the nuclear reaction $^3He+\mu^- \to ^3H+\gamma+\nu_{\mu}$ has
been calculated using both the elementary particle model (EPM) approach and the
impulse approximation (IA) approach. Using the EPM approach, the exclusive
statistical radiative muon capture (RMC) rate for photon energy greater than 57
MeV is found to be $0.245 s^{-1}$ and the ordinary muon capture (OMC) rate to
be $1503 s^{-1}$. The IA calculation exhibits a slight dependence on the type
of trinucleon wave functions used. The difference between the IA and EPM
calculation is larger for RMC than for OMC. To resolve the difference between
the two approaches a more detailed investigation including meson exchange
corrections will be required.


title:
p-$^3$He Effective Potentials based on the Pauli Corrected Resonating
  Group Method

abstract:
  Effective interactions that fit the low energy p-$^3$He experimental data
have been constructed. They are based on the Resonating Group Method and a
modified Orthogonality Condition Model in which Pauli and partly Pauli
forbidden states are removed from the spectrum. Partial waves up to L=3 have
been considered. The LS force acting between the proton and $^3$He has been
included phenomenologically, while the Coulomb interaction has been
incorporated using a renormalization technique for a screened Coulomb
interaction. The potentials are also given in a separable momentum space form,
obtained using the Ernst-Shakin-Thaler (EST) method. In all cases the
potentials generate phase shifts that fit well the low energy experimental
data.


title:
Chemical factors in canonical statistical models for relativistic heavy
  ion collisions

abstract:
  We study the effect of enforcing exact conservation of charges in statistical
models of particle production for systems as large as those relevant to
relativistic heavy ion collisions. By using a numerical method developed for
small systems, we have been able to approach the large volume limit keeping the
exact canonical treatment of all relevant charges, namely baryon number,
strangeness and electric charge. Hence, we hereby give the information needed
in a hadron gas model whether the canonical treatment is necessary or not in
actual cases. Comparison between calculations and experimental particle
multiplicities is shown. Also, a discussion on relative strangeness chemical
equilibrium is given.


title: Electromagnetic, weak, and strong interactions of light mesons

abstract:
  The ladder-rainbow truncation of the set of Dyson-Schwinger equations is used
to study a variety of electroweak and strong processes involving light mesons.
The parameters in the effective interaction are constrained by the chiral
condensate and f_\pi; the current quark masses are fitted to m_\pi and m_K. The
obtained electromagnetic form factors are in good agreement with the data. Also
the weak K_{l3} decay and the radiative and strong decays of the vector mesons
agree reasonably well with the data. Finally, we indicate how processes such as
\pi-\pi scattering can be described within this framework as well.


title: Dissociation of a Heavy Quarkonium at T<T_c

abstract:
  We examine three different ways a heavy quarkonium can dissociate at
temperatures below the quark-gluon plasma phase transition temperature T_c:
spontaneous dissociation, dissociation by thermalization, and dissociation by
collision with hadrons. We evaluate the cross sections for the dissociation of
J/psi and Upsilon in collision with pion as a function of temperature, using
the quark-interchange model of Barnes and Swanson. We also evaluate the
dissociation temperatures for various quarkonia, and the fraction of quarkonium
lying above the dissociation threshold as a function of temperature, using an
interquark potential inferred from lattice gauge calculations.


title:
Singularities of ultra-relativistic expanding quark-gluon plasma within
  Quark-gluon transport theory

abstract:
  We follow Quark-gluon transport theory and analyse singularities of the
ultra-relativistic and spherical expanding quark-gluon plasma. Within the
linearized QCD oscillations and instabilities of the ultra-relativistic and
spherical symmetric expanding quark-gluon plasma near global thermodynamical
equilibrium are investigated in dependence on a chemical potential mu(T) of
non-strange light quarks and antiquarks, a strange quark mass m_s, a
temperature T and a hydrodynamical velocity $u$. We calculate the
chromoelectric permeability tensor for the quark-gluon plasma at rest and
ultra-relativistic moving. We show that the contribution of chemical potential
of light quarks and antiquarks can be neglected to the chromoelectric
permeability. We show that the account for the non-zero mass of strange quarks
and antiquarks diminishes the value of the plasma frequency. We show that the
plasma frequency of the ultra-relativistic and spherical symmetric expanding
quark-gluon plasma is enhanced by a Lorentz factor compared with the plasma
frequency of the quark-gluon plasma at rest. We find that the
ultra-relativistic and spherical symmetric expanding quark-gluon plasma behaves
like a collisionless thermalized plasma.


title: Attenuation of the intensity within a superdeformed band

abstract:
  The attenuation of the intraband intensity of a superdeformed band, which
results from mixing with normally deformed configurations, is calculated using
reaction theory. It is found that the sharp increase of the attenuation is
mostly due to the tunnelling through a spin dependent barrier and not to the
chaotic nature of the normally deformed states.


title: The alpha-particle based on modern nuclear forces

abstract:
  The Faddeev-Yakubovsky equations for the alpha-particle are solved. Accurate
results are obtained for several modern NN interaction models, which include
charge-symmetry breaking effects in the NN force, nucleon mass dependences as
well as the Coulomb interaction. These models are augmented by three-nucleon
forces of different types and adjusted to the 3N binding energy. Our results
are close to the experimental binding energy with a slight overbinding. Thus
there is only little room left for the contribution of possible 4N interactions
to the alpha-particle binding energy. We also discuss model dependences of the
binding energies and the wave functions.


title:
The $\sigma$-meson and $\pi$-$\pi$ Correlation in Hot/Dense Medium: soft
  modes for chiral transition in QCD

abstract:
  After a brief overview of the realization of chiral symmetry in hot and/or
dense medium, the implications of the existence of a light scalar-isoscalar
meson (which we call $\sigma$ throughout this report) are discussed in the
vacuum and in the medium. Special emphasis is put on its relation to the
fluctuation of the chiral order parameter $<\bar{q}q>$. In the vacuum, the
$\sigma$-meson is an elusive resonance corresponding to a pole deep in the
second Riemann sheet of the $\pi$-$\pi$ scattering matrix in the $I$=$J$=0
channel. This is because the the amplitude fluctuation of $<\bar{q}q>$
(corresponding to {\rm ur}-$\sigma$) and the phase fluctuation of $<\bar{q}q>$
(2 pion states) mix strongly in the vacuum. As the temperature and/or density
of the system increase, however, there arises a softening of this complex pole
due to the partial restoration of chiral symmetry. Such soft modes play a key
role to understand the QCD phase structure. We demonstrate that even a slight
softening of the $\sigma$ mode could induce strong spectral enhancement and
strong $\pi$-$\pi$ correlation near the 2$m_{\pi}$ threshold in the $I$=$J$=0
channel, which thereby can be a signature of the partial restoration of chiral
symmetry. Such spectral enhancement may be seen not only in hot matter created
by the relativistic heavy ion collisions but also in cold matter (heavy nuclei)
probed by photons and hadrons. Relevance of the partial restoration of chiral
symmetry in heavy nuclei with the recent data by the CHAOS and CB
collaborations as well as with on-going and future experiments are also
discussed.


title:
Perturbative Calculation of Excluded Volume Effect for Nuclear Matter in
  a Relativistic Mean-field Approximation

abstract:
  Considering the finite volume of nucleons, a Lagrangian density is given. The
first order self-energy of the nucleon and the equation of state of nuclear
matter are calculated in the framework of relativistic mean-field
approximation. Our results indicate the effects of the volume of nucleons are
not negligible.


title: Light Front Field Theory Calculation of Deuteron Properties

abstract:
  Light front dynamics is a promising approach for calculating the deuteron
wave function and form factors at high momentum transfers. However, in
light-front dynamics rotational invariance is not manifest, which results in a
splitting in the binding energies of states with different magnetic quantum
numbers and a breaking of the angular condition for the matrix elements of the
deuteron current operator. The objective of this work is to investigate the
symptoms of broken rotational invariance.
  We first consider the Wick-Cutkosky model. The binding energies of states
with different m values are split when calculated with the OME potential, but
this splitting is reduced for all states when the TME potential is included.
Next, we derive light-front nucleon-nucleon OME and TME potentials from an
effective nuclear Lagrangian. We consider first the potentials generated by the
exchange of pions only, then the potentials generated by all the mesons. For
both models, there is a splitting in the binding energies between the m=0 and
m=1 deuteron states when the OME potential is used, which is reduced when we
include the TME potential.
  The deuteron wave functions are used to calculate the electromagnetic and
axial current matrix elements and form factors. The matrix elements of the
electromagnetic current operator have better transformation properties under
rotations when we use the OME potential instead of the OME+TME potential to
calculate the wave functions. At momentum transfers greater than about 2 GeV^2,
the breaking of rotational invariance causes less uncertainty in the A and B
form factors than do the uncertainties in the nucleon form factors.


title: Electrostatic mapping of nuclear pairing

abstract:
  The traditional nuclear pairing problem is shown to be in one-to-one
correspondence with a classical electrostatic problem in two dimensions. We
make use of this analogy in a series of calculations in the Tin region, showing
that the extremely rich phenomenology that appears in this classical problem
can provide interesting new insights into nuclear superconductivity.


title:
The size of two-body weakly bound objects : short versus long range
  potentials

abstract:
  The variation of the size of two-body objects is investigated, as the
separation energy approaches zero, with both long range potentials and short
range potentials having a repulsive core. It is shown that long range
potentials can also give rise to very extended systems. The asymptotic laws
derived for states with angular momentum l=1,2 differ from the ones obtained
with short range potentials. The sensitivity of the asymptotic laws on the
shape and length of short range potentials defined by two and three parameters
is studied. These ideas as well as the transition from the short to the long
range regime for the l=0 case are illustrated using the Kratzer potential.


title: Microscopic Study of Nuclear "Pasta" by Quantum Molecular Dynamics

abstract:
  Structure of cold dense stellar matter at subnuclear densities is
investigated with quantum molecular dynamics (QMD). We succeeded in showing
that the phases with slab-like and rod-like nuclei etc. can be formed
dynamically without any assumptions on the nuclear shape. Our result suggests
the existence of these kinds of phases in neutron star crusts.


title:
Two pion photoproduction on nucleons and nuclei in the rho and sigma
  regions

abstract:
  In this talk we report on two physical processes, the photoproduction of
  $\rho$ mesons in nuclei and the $\pi^0 \pi^0$ photoproduction in nuclei at
low energies. In the first case the aim is to observe experimentally the
theoretically predicted changes on the $\rho $ properties in the nuclear
medium. In the second case one wishes to investigate the modifications of the
$\pi \pi$ interaction in the nuclear medium in the region of the $\sigma$
meson. In the first case we observe that it is quite difficult to see large
effects due to the $\rho$ modification in the medium because the detection of
the $\rho $ is done through the two pions which are produced in the $\Delta$
region and are largely distorted in the medium. In the second case, when the
I=0 part of the $\pi \pi$ interaction is substituted by the in medium $\pi \pi$
amplitude, we observe a very large shift of strength in the invariant mass
distribution to small values of the mass in $^{12}C$ and $^{208}Pb$ with
respect to the distribution of the elementary reaction. This spectacular shift
appears to be corroborated by recent experiments at Mainz reported in this same
Workshop.


title: Asymmetric nuclear matter:the role of the isovector scalar channel

abstract:
  We try to single out some qualitative new effects of the coupling to the
$\delta$-isovector-scalar meson introduced in a minimal way in a
phenomenological hadronic field theory. Results for the equation of state
($EOS$) and the phase diagram of asymmetric nuclear matter ($ANM$) are
discussed. We stress the consistency of the $\delta$-coupling introduction in a
relativistic approach. New contributions to the slope and curvature of the
symmetry energy and the neutron-proton effective mass splitting appear
particularly interesting. A more repulsive $EOS$ for neutron matter at high
baryon densities is expected. Effects on new critical properties of warm $ANM$,
mixing of mechanical and chemical instabilities and isospin distillation, are
also presented. The $\delta$ influence is mostly on the {\it isovectorlike}
collective response.
  The results are largely analytical and this makes the physical meaning quite
transparent. Implications for nuclear structure properties of drip-line nuclei
and for reaction dynamics with Radioactive Beams are finally pointed out.


title: Aspects of meson properties in dense nuclear matter

abstract:
  We investigate the modification of meson spectral densities in dense nuclear
matter at zero temperature. These effects are studied in a fully relativistic
mean field model which goes beyond the linear density approximation and also
includes baryon resonances. In particular, the role of N*(1520) and N*(1720) on
the rho meson spectral density is highlighted. Even though the nucleon-nucleon
loop and the nucleon-resonance loop contribute with the opposite sign, an
overall reduction of rho meson mass is still observed at high density.
Importantly, it is shown that the resonances cause substantial broadening of
the rho meson spectral density in matter and also induces non-trivial momentum
dependence. The spectral density of the a0 meson is also shown. We study the
dispersion relations and collective oscillations induced by the rho meson
propagation in nuclear matter together with the influence of the mixing of rho
with the a0 meson. The relevant expression for the plasma frequency is also
recovered analytically in the appropriate limit.


title: Weak Decay of Lambda Hypernuclei

abstract:
  In this review we discuss the present status of strange nuclear physics, with
special attention to the weak decay of Lambda hypernuclei. The models proposed
for the evaluation of the Lambda decay widths are summarized and their results
are compared with the data. Despite the recent intensive investigations, the
main open problem remains a sound theoretical interpretation of the large
experimental values of the ratio G_n/G_p. Although recent works offer a step
forward in the solution of the puzzle, further efforts must be invested in
order to understand the detailed dynamics of the non-mesonic decay. Even if, by
means of single nucleon spectra measurements, the error bars on G_n/G_p have
been considerably reduced very recently at KEK, a clean extraction of G_n/G_p
is needed. What is missing at present, but planned for the next future, are
measurements of 1) nucleon energy spectra in double coincidence and 2) nucleon
angular correlations: such observations allow to disentangle the nucleons
produced in one- and two-body induced decays and lead to a direct determination
of G_n/G_p. For the asymmetric non-mesonic decay of polarized hypernuclei the
situation is even more puzzling. Indeed, strong inconsistencies appear already
among data. A recent experiment obtained a positive intrinsic Lambda asymmetry
parameter, a_{Lambda}, for 5_{Lambda}He. This is in complete disagreement with
a previous measurement, which obtained a large and negative a_{Lambda} for
p-shell hypernuclei, and with theory, which predicts a negative value
moderately dependent on nuclear structure effects. Also in this case, improved
experiments establishing with certainty the sign and magnitude of a_{Lambda}
for s- and p-shell hypernuclei will provide a guidance for a deeper
understanding of hypernuclear dynamics and decay mechanisms.


title: Deuteron binding energies and form factors from light front field theory

abstract:
  The objective of this paper is to investigate how the breaking of manifest
rotational invariance in light-front dynamics affects the binding energy and
the form factors of the deuteron. To do this, we derive new light-front
nucleon-nucleon one- and two-meson-exchange potentials, and use the potentials
to solve for the deuteron wave function and binding energy. We find that
including two-meson-exchange (TME) potentials partially repairs the broken
rotational invariance of the one-meson-exchange (OME) potential. This is shown
by a decrease in binding energy difference of different $m$ states of the
deuteron. We calculate the matrix elements of the electromagnetic current using
the deuteron wave functions obtained from the OME and OME+TME potentials.
Rotational invariance requires that the matrix elements satisfy an angular
condition, but in light-front dynamics that condition is only partially
satisfied. The current matrix elements from the OME calculation satisfy the
angular condition better than the ones from the OME+TME calculation. The matrix
elements of the axial current satisfy the angular condition to the same extent
regardless of which wave functions are used for the calculation. Finally, we
find that at momentum transfers greater than about 2 GeV$^2$, the breaking of
rotational invariance causes less uncertainty in the computed deuteron form
factors than do the uncertainties in the nucleon form factors.


title:
Behavior of the charge fluctuation in relativistic nucleus-nucleus
  collisions

abstract:
  Using a hadron and string cascade model, JPCIAE, we investigated the
dependence of event-by-event charge fluctuation on the energy, centrality,
window size, resonance decay, and the final state interaction for $Pb+Pb$
collisions at SPS and LHC energies and $Au+Au$ collisions at RHIC energies. The
JPCIAE results of charge fluctuation as a function of the rapidity window size
in $Pb+Pb$ collisions at SPS energies were compared with the preliminary NA49
data. Comparisons with STAR and PHENIX data of $Au+Au$ collisions at
$\sqrt{s_{nn}}$=130 GeV were also given. It seems that the final state
interaction and resonance decay play a gentle role on the charge fluctuations.
The charge fluctuations are slightly decreasing with or nearly independent of
the reaction energy and hardly depend on the collision centrality.


title:
Glauber model for heavy ion collisions from low energies to high
  energies

abstract:
  The Glauber model is extensively applied to heavy ion collision for
describing a number of interaction processes over a wide range of energies from
near the Coulomb barrier to higher energies. The model gives the
nucleus-nucleus interaction in terms of interaction between the constituent
nucleons with a given density distribution. The model is a semiclassical model
picturing the nuclear collision in the impact parameter representation where
the nuclei move along the collision direction in a straight path. In these
lectures we derive this model and discuss its applications in variety of
problems in nuclear and high energy physics.


title:
phi puzzle in heavy-ion collisions at 2 AGeV: how many K-from phi
  decays?

abstract:
  The preliminary experimental data on $\phi$ production in the reaction
Ni(1.93 AGeV) + Ni point to a puzzling high $\phi$ yield which can not be
reproduced with present transport codes. We survey the experimental situation
and present prospects for dedicated measurements of the $\phi$ multiplicities
with the $K^+ K^-$ and $e^+ e^-$ channels at HADES and FOPI.


title:
Two-body correlations in N=8 and 10 nuclei and effective neutron-neutron
  interactions in Tamm-Dancoff and two-particle RPA models

abstract:
  We apply a particle-particle RPA model to study the properties of the
two-neutron valence wave function in nuclei 14-C, 12-Be, 11-Li and 14-Be. The
RPA model takes account of two body correlations in the core so that it gives a
better description of energies and amplitudes than models which assume a
neutron closed shell (or subshell) core. With a Gogny neutron-neutron effective
interaction or with the equivalent density dependent delta force we are able to
reproduce the two-neutron separation energies in these nuclei and in the
corresponding cores, except for 9-Li. These calculations suggest the same
2s-1p1/2 shells inversion in 12-Be_13-Be than in 11-Be.


title:
The Azimuthal Asymmetry at large p_t seem to be too large for a ``Jet
  Quenching''

abstract:
  We discuss simple generic model of ``jet quenching'' in which matter
absorption is defined by one parameter. We show that as absorption grows, the
azimuthal asymmetry v_2 grows as well, reaching the finite limit with a simple
geometric interpretation. It turns out, that this limit is still below the
experimental values for 6 > p_t > 2 GeV, according to preliminary data from
STAR experiment at RHIC. We thus conclude that ``jet quenching'' models alone
cannot account for the observed phenomenon, and speculate about alternative
scenarios.


title: Strange particle production at RHIC in a single-freeze-out model

abstract:
  Strange particle ratios and pT-spectra are calculated in a thermal model with
single freeze-out, previously used successfully to describe non-strange
particle production at RHIC. The model and the recently released data for phi,
Lambda, anti-Lambda, and K*(892) are in very satisfactory agreement, showing
that the thermal approach can be used to describe the strangeness production at
RHIC.


title:
Thermal description of particle production in ultra-relativistic
  heavy-ion collisions

abstract:
  The grand-canonical version of the thermal model is used to analyze the
ratios of particle abundances measured in ultra-relativistic heavy-ion
collisions. Exactly the same model is applied to study the heavy-ion reactions
at BNL AGS, CERN SPS, and BNL RHIC. A very good description is achieved for
Pb+Pb collisions at SPS, and for Au+Au collisions at RHIC. In these two cases
the value of the temperature characterizing the chemical freeze-out is
practically same: T=168 MeV at SPS and T=165 MeV at RHIC. On the other hand,
the particle ratios measured in the collisions of lighter nuclei are described
only in the qualitative way. We discuss also the effect of the possible
in-medium modifications of hadron masses and widths on the thermal fits. For
Pb+Pb collisions at SPS and Au+Au collisions at RHIC we find that the chi^2
fits favor slightly a moderate (20%) decrease of the masses. In-medium
modifications of the widths have little effect on the fits, unless they are
increased by a factor larger than 2. We study in detail the thermodynamic
conditions characterizing the chemical freeze-out. In particular, we find that
the average baryon energy is 1.6 GeV and the average meson energy is 0.9 GeV.
This difference reflects a different behavior of the mass spectra of mesons and
baryons.


title:
The canonical effect in statistical models for relativistic heavy ion
  collisions

abstract:
  Enforcing exact conservation laws instead of average ones in statistical
thermal models for relativistic heavy ion reactions gives raise to so called
canonical effect, which can be used to explain some enhancement effects when
going from elementary (e.g. pp) or small (pA) systems towards large AA systems.
We review the recently developed method for computation of canonical
statistical thermodynamics, and give an insight when this is needed in analysis
of experimental data.


title: Strangeness Production in Microscopic Transport Models

abstract:
  Strangeness production in microscopic transport models for relativistic
heavy-ion collisions from SIS to RHIC is reviewed: after a brief introduction
into elementary strangeness production processes, the main emphasis is put on
strangeness as indicator of the nuclear equation of state, the excitation
function of the $K^+/\pi^+$ ratio and strangeness as a deconfinement indicator.


title: In-Medium Baryon Interactions and Hypernuclear Structure

abstract:
  We introduce a microscopic and relativistic theory describing free scattering
and finite nuclei for the octet baryons in a consistent quantum field
theoretical framework based on Dirac-Brueckner theory and nuclear mean-field.
In a first quantitative approach - yet still heuristic for dealing with the
$\Lambda$ hyperon - the quality of the description of finite (hyper)nuclei
based on free meson exchange potentials is competitive with those from purely
phenomenological relativistic mean-field calculations. In contrast to the
latter our approach has the advantage of having a microscopic link to free
interactions and complete control on which classes of diagrams are included. As
a complementary way for determining hyperon-hyperon and hyperon-nucleon
interactions the use of Hanbury-Brown-Twiss interferometry is discussed.


title: Nuclear medium effects on the sigma mass and width

abstract:
  The meson meson interaction in the scalar isoscalar channel at finite
baryonic density is studied in the framework of a chiral unitary approach which
generates the f0 and sigma resonances and reproduces well the meson meson phase
shifts in vacuum. We investigate the sigma spectral function, its mass and its
width as a function of the baryon density and discuss possible experimental
signatures in the (pi,2pi) and the (gamma,2pi) reactions.


title:
Isoscaling in Light-Ion Induced Reactions and its Statistical
  Interpretation

abstract:
  Isotopic effects observed in fragmentation reactions induced by protons,
deuterons, and alpha particles of incident energies between 660 MeV and 15.3
GeV on 112-Sn and 124-Sn targets are discussed. The exponential scaling of the
yield ratios with the third component of the fragment isospin (N-Z)/2 is
observed in all reactions, with scaling parameters that depend on the incident
energy. Breakup temperatures for these reactions are deduced from double ratios
of isotopic yields and tested for their relation with the isoscaling
parameters. The quantum statistical (QSM) and the statistical
multifragmentation (SMM) models are used for interpreting the results. The
observed isoscaling can be understood as a consequence of a statistical origin
of the emitted fragments in these reactions. The SMM analysis shows that the
exponent describing the isoscaling behavior is proportional to the strength of
the symmetry term of the fragment binding energy. Using this result, a
symmetry-term coefficient (approximately 22.5 MeV) for fragments at breakup is
deduced from the experimental data. This is close to the standard value and
supports SMM assumptions for the breakup configuration. An alternative method
of determining the symmetry-energy coefficient, by using isotope distribution
widths, is also discussed.


title:
Microscopic Description of Band Structure at Very Extended Shapes in the
  A ~ 110 Mass Region

abstract:
  Recent experiments have confirmed the existence of rotational bands in the A
\~ 110 mass region with very extended shapes lying between super- and
hyper-deformation. Using the projected shell model, we make a first attempt to
describe quantitatively such a band structure in 108Cd. Excellent agreement is
achieved in the dynamic moment of inertia J(2) calculation. This allows us to
suggest the spin values for the energy levels, which are experimentally
unknown. It is found that at this large deformation, the sharply down-sloping
orbitals in the proton i_{13/2} subshell are responsible for the irregularity
in the experimental J(2), and the wave functions of the observed states have a
dominant component of two-quasiparticles from these orbitals. Measurement of
transition quadrupole moments and g-factors will test these findings, and thus
can provide a deeper understanding of the band structure at very extended
shapes.


title: Particle Ratios, Equilibration, and the QCD Phase Boundary

abstract:
  We discuss the status of thermal model descriptions of particle ratios in
central nucleus-nucleus collisions at ultra-relativistic energy. An alternative
to the
  ``Cleymans-Redlich'' interpretation of the freeze-out trajectory is given in
terms of the total baryon density. Emphasis is placed on the relation between
the chemical equilibration parameters and the QCD phase boundary. Furthermore,
we trace the essential difference between thermal model analyses of data from
collisions between elementary particles and from heavy ion collisions as due to
a transition from local strangeness conservation to percolation of strangeness
over large volumes, as occurs naturally in a deconfined medium.
  We also discuss predictions of the thermal model for composite particle
production.


title: Scattering of vector mesons off nucleons

abstract:
  We construct a relativistic and unitary approach to 'high' energy pion- and
photon-nucleon reactions taking the $\pi N, \pi \Delta$, $\rho N$, $\omega N$,
$\eta N, K \Lambda, K \Sigma$ final states into account. Our scheme dynamically
generates the s- and d-wave nucleon resonances N(1535), N(1650) and N(1520) and
isobar resonances $\Delta(1620)$ and $\Delta(1700)$ in terms of quasi-local
interaction vertices. The description of photon-induced processes is based on a
generalized vector-meson dominance assumption which directly relates the
electromagnetic quasi-local 4-point interaction vertices to the corresponding
vertices involving the $\rho$ and $\omega$ fields. We obtain a satisfactory
description of the elastic and inelastic pion- and photon-nucleon scattering
data in the channels considered. The resulting s-wave $\rho$- and
$\omega$-nucleon scattering amplitudes are presented. Using these amplitudes we
compute the leading density modification of the $\rho$ and $\omega$ energy
distributions in nuclear matter. We find a repulsive energy shift for the
$\omega $ meson at small nuclear density but predict considerable strength in
resonance-hole like $\omega$-meson modes. Compared to previous calculations our
result for the $\rho$-meson spectral function shows a significantly smaller
in-medium effect. This reflects a fairly small coupling strength of the N(1520)
resonance to the $\rho N$ channel.


title: Chiral SU(3) Symmetry and Strangeness

abstract:
  In this talk we review recent progress on the systematic evaluation of the
kaon and antikaon spectral functions in dense nuclear matter based on a chiral
SU(3) description of the low-energy pion-, kaon- and antikaon-nucleon
scattering data.


title:
Deuteron Structure at Small $N - N$ Distances from Inelastic $e-D$ and
  $p-D$ Reactions

abstract:
  The outline of the presentation is as follows: I. Nucleon Distribution in the
Deuteron from $e-D$ and $p-D$ Processes. II. Quark Distribution in Deuteron
from its Fragmentation to Pions and Deep Inelastic $e-D$ scattering.
III.Difference of These Two Distributions and Its Possible Understanding.


title: Coherent Interactions in Nucleus-Nucleus Collisions

abstract:
  At the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National
Laboratory and at the Large Hadron Collider (LHC) at CERN, particles will be
produced in coherent and diffractive nuclear interactions. In extremely
peripheral nuclear collisions (b$>$2R), coherent interactions occur at very
high rates and are dominated by photon-Pomeron or photon-meson processes. In
these reactions, the photon and the Pomeron/meson from the electromagnetic and
nuclear fields couple coherently to all nucleons. The rates for photonuclear
interactions are roughly two orders of magnitude larger than for two-photon
interactions at comparable center-of-mass energies.


title:
Gamow-Teller strength and the spin-isospin coupling constants of the
  Skyrme energy functional

abstract:
  We investigate the effects of the spin-isospin channel of the Skyrme energy
functional on predictions for Gamow-Teller distributions and superdeformed
rotational bands. We use the generalized Skyrme interaction SkO' to describe
even-even ground states and then analyze the effects of time-odd spin-isospin
couplings, first term by term and then together via linear regression. Some
terms affect the strength and energy of the Gamow-Teller resonance in finite
nuclei without altering the Landau parameter g_0' that to leading order
determines spin-isospin properties of nuclear matter. Though the existing data
are not sufficient to uniquely determine all the spin-isospin couplings, we are
able to fit them locally. Altering these coupling constants does not change the
quality with which the Skyrme functional describes rotational bands.


title:
Nuclear matter hole spectral function in the Bethe-Brueckner-Goldstone
  approach

abstract:
  The hole spectral function is calculated in nuclear matter to assess the
relevance of nucleon-nucleon short range correlations. The calculation is
carried out within the Brueckner scheme of many-body theory by using several
nucleon-nucleon realistic interactions. Results are compared with other
approaches based on variational methods and transport theory. Discrepancies
appear in the high energy region, which is sensitive to short range
correlations, and are due to the different many-body treatment more than to the
specific N-N interaction used. Another conclusion is that the momentum
dependence of the G-matrix should be taken into account in any self consistent
approach.


title: Echos of the liquid-gas phase transition in multifragmentation

abstract:
  A general discussion is made concerning the ways in which one can get
signatures about a possible liquid-gas phase transition in nuclear matter.
Microcanonical temperature, heat capacity and second order derivative of the
entropy versus energy formulas have been deduced in a general case. These
formulas are {\em exact}, simply applicable and do not depend on any model
assumption. Therefore, they are suitable to be applied on experimental data.
The formulas are tested in various situations. It is evidenced that when the
freeze-out constraint is of fluctuating volume type the deduced (heat capacity
and second order derivative of the entropy versus energy) formulas will prompt
the spinodal region through specific signals. Finally, the same microcanonical
formulas are deduced for the case when an incomplete number of fragments per
event are available. These formulas could overcome the freeze-out backtracking
deficiencies.


title: Nonlocal calculation for nonstrange dibaryons and tribaryons

abstract:
  We study the possible existence of nonstrange dibaryons and tribaryons by
solving the bound-state problem of the two- and three-body systems composed of
nucleons and deltas. The two-body systems are $NN$, $N\Delta$, and
$\Delta\Delta$, while the three-body systems are $NNN$, $NN\Delta$,
$N\Delta\Delta$, and $\Delta\Delta\Delta$. We use as input the nonlocal $NN$,
$N\Delta$, and $\Delta\Delta$ potentials derived from the chiral quark cluster
model by means of the resonating group method. We compare with previous results
obtained from the local version based on the Born-Oppenheimer approximation.


title:
The Hypernuclei $^4_\Lambda$He and $^4_\Lambda$H: Challenges for Modern
  Hyperon-Nucleon Forces

abstract:
  The hypernuclei $^4_\Lambda$He and $^4_\Lambda$H provide important
information on the hyperon-nucleon interaction. We present accurate
Faddeev-Yakubovsky calculations for the $\Lambda$ separation energies of the
$0^+$ ground and the $1^+$ excited states based on the Nijmegen SC YN
interactions. We explicitly take the $\Sigma$ admixture into account. Mass
differences of the baryons and the charge-dependence of the interaction are
considered. The results show that the Nijmegen models cannot predict all
separation energies simultaneously hinting to failures of the current
interaction models.


title: Continuum HFB calculations with finite range pairing interactions

abstract:
  A new method of calculating pairing correlations in coordinate space with
finite range interactions is presented. In the Hartree-Fock-Bogoliubov (HFB)
approach the mean field part is derived from a Skyrme-type force whereas the
pairing field is constructed with a Gogny force. An iterative scheme is used
for solving the integro-differential HFB equations via the introduction of a
local equivalent potential. The method is illustrated on the case of the
nucleus $^{18}$C. It is shown that the results are insensitive to the cut off
value in the quasiparticle spectrum if this value is above 100 MeV.


title: K+/pi+ probes of jet quenching in AA collisions

abstract:
  Non-abelian energy loss in quark gluon plasma is shown to lead to novel
hadron ratio suppression patterns in ultrarelativistic nuclear collisions. We
apply recent (GLV) estimates for the gluon radiative energy loss, which
increases linearly with the jet energy up to E<20 GeV and depends quadratically
on the nuclear radius, R. The K+/\pi+ ratio is found to be most sensitive to
the initial density of the plasma.


title:
Considerations on rescattering effects for threshold photo- and
  electro-production of $\pi^0$ on deuteron

abstract:
  We show that for the S-state $\pi^0$-production in processes $\gamma+d\to
d+\pi^0$ and $e^-+d\to e^-+d+\pi^0$ the rescattering effects due to the
transition: $ \gamma+d\to p+p+\pi^-$ (or $n+n+\pi^+)\to d+\pi^0$ are cancelled
out due to the Pauli principle. The large values for these effects predicted in
the past may result from the fact that the spin structure of the corresponding
matrix element and the necessary antisymmetrization induced by the presence of
identical protons (or neutrons) in the intermediate state was not taken into
account accurately. One of the important consequences of these considerations
is that $\pi^0$ photo- and electro-production on deuteron near threshold can
bring direct information about elementary neutron amplitudes.


title: Dissociation of Heavy Quarkonia in the Quark-Gluon Plasma

abstract:
  Using a temperature-dependent potential obtained from lattice gauge
calculations, we study the stability of heavy quarkonia in the quark-gluon
plasma. We find that only the Upsilon(1S) and the eta_b(1S) are bound in the
quark-gluon plasma, and have a small binding energy. The quark-gluon plasma may
be revealed by an Upsilon(1S) dilepton peak with an invariant mass close to
twice the current b quark mass, which is lower than the Upsilon(1S) mass in
free space. The quarkonia Upsilon(1S) and eta_b(1S) can dissociate by collision
with quarks and gluons in the quark-gluon plasma. We evaluate the dissociation
cross section of the Upsilon(1S) due to gluon absorption. The Upsilon(1S) and
the eta_b(1S) can also dissociate spontaneously at temperatures above the
dissociation temperature 1.11T_c, where T_c is the quark-gluon plasma phase
transition temperature. At temperatures slightly above the dissociation
temperature these states appear as resonances, which provides another signature
for the quark-gluon plasma.


title:
Study of the $\eta$-nucleus interaction in the $p d \to ^3He \eta$
  reaction near threshold

abstract:
  A detailed study of the effect of the $\eta$-nucleus final state interaction
(FSI) in the $p d \to ^3$He$ \eta$ reaction close to threshold is presented.
The FSI is incorporated through a T-matrix for $\eta ^3$He elastic scattering,
constructed using few body equations. This T-matrix accounts for off-shell and
binding effects in $\eta$-nucleus scattering. The energy dependence of the data
on the $p d \to ^3$He$ \eta$ reaction near threshold is reproduced only after
including the FSI. The off-shell and binding effects in $\eta ^3$He scattering
are found to be important. Given the uncertainty in the knowledge of the
elementary $\eta$-nucleon interaction, the sensitivity of the $ p d \to ^3$He$
\eta$ cross section to different prescriptions of the elementary t-matrix,
$t_{\eta N \to \eta N}$ is also discussed.


title: Ab-initio No-Core Shell Model With Many-Body Forces

abstract:
  Working in the framework of the ab-initio no-core shell model, we derive
two-body effective interactions microscopically for specific
harmonic-oscillator basis spaces from the realistic Argonne V8' nucleon-nucleon
potential. However, our two-body effective interaction is only the dominant
part of the A-body (A >= 3) effective interaction, which also contains three-,
four- and, in general, up to A-body components. We model these multi-body
components as a simple two-parameter, basis-space-dependent interaction. We
then investigate the coupling needed to provide accurate descriptions of
selected nuclear observables. We successfully model the multi-body interaction
as a zero-range two-body operator times the number operator Nsps that measures
the harmonic-oscillator quanta of the spectator nucleons.


title:
Total Photoabsorption Cross Sections of A=6 Nuclei with Complete Final
  State Interaction

abstract:
  The total photoabsorption cross sections of 6He and 6Li are calculated
microscopically with full inclusion of the six-nucleon final state interaction
using semirealistic nucleon-nucleon potentials. The Lorentz Integral Transform
(LIT) method and the effective interaction approach for the hyperspherical
formalism are employed. While 6Li has a single broad giant resonance peak,
there are two well separated peaks for 6He corresponding to the breakup of the
neutron halo and the alpha core, respectively. The comparison with the few
available experimental data is discussed.


title: Production of phi mesons in subthreshold heavy-ion collisions

abstract:
  Within a BUU type transport model we study $\phi$ meson production in
subthreshold Ni+Ni and Ru+Ru reactions. For the first time we included in our
model the elementary reaction channels $\rho+N,\Delta \to \phi+N$, $\pi+N(1520)
\to \phi+N$ and $\pi \rho$ $\to$ $\phi$. In spite of a substantial increase of
the $\phi$ multiplicities by these channels our results stay significantly
below the preliminary experimental data.


title: Mass formula for T=0 and T=1 ground states of N=Z nuclei

abstract:
  An algebraic model is developed to calculate the T=0 and T=1 ground state
binding energies for N=Z nuclei. The method is tested in the sd shell and is
then extended to 28-50 shell which is currently the object of many experimental
studies.


title: Three-Cluster Equation Using Two-Cluster RGM Kernel

abstract:
  We propose a new type of three-cluster equation which uses two-cluster
resonating-group-method (RGM) kernels. In this equation, the orthogonality of
the total wave-function to two-cluster Pauli-forbidden states is essential to
eliminate redundant components admixed in the three-cluster systems. The
explicit energy-dependence inherent in the exchange RGM kernel is
self-consistently determined. For bound-state problems, this equation is
straightforwardly transformed to the Faddeev equation which uses a modified
singularity-free T-matrix constructed from the two-cluster RGM kernel. The
approximation of the present three-cluster formalism can be examined with more
complete calculation using the three-cluster RGM. As a simple example, we
discuss three di-neutron (3d') and 3 alpha systems in the harmonic-oscillator
variational calculation. The result of the Faddeev calculation is also
presented for the 3' system.


title: Jet Tomography of Au+Au Reactions Including Multi-gluon Fluctuations

abstract:
  Jet tomography is the analysis of the attenuation pattern of high transverse
momentum hadrons to determine certain line integral transforms of the density
profile of the QCD matter produced in ultra-relativistic nuclear collisions. In
this letter, we calculate the distortion of jet tomography due to multi-gluon
fluctuations within the GLV radiative energy loss formalism. We find that
fluctuations of the average gluon number, <N^g> ~ 3 for RHIC initial
conditions, reduce the attenuation of pions by approximately a factor Z ~
0.4-0.5. Therefore the plasma density inferred from jet tomography without
fluctuations must be enhanced by a factor 1/Z ~ 2.


title:
Multiplicity Moments and Hard Processes in Relativistic Heavy Ion
  Collisions

abstract:
  The normalized multiplicity moments and their relation with soft and hard
processes in relativistic heavy ion collisions are analyzed in a general
two-component model. It is found that, the strong fluctuations in binary
collision number N_c in minimum-bias events can enhance the hard component,
especially for the higher order moments. This enhancement can not be
effectively described by modifying the participant number in the one-component
model.


title:
A Nonlinear Realized Approach of SU(2) Chiral Symmetry Spontaneous
  Breaking and Properties of Nuclear Matter

abstract:
  A nonlinear realization of SU(2) chiral symmetry spontaneous breaking
approach is developed in the composite operator formalism. A Lagrangian
including quark, gluon and Goldstone boson degrees of freedom of the chiral
quark model is obtained from the QCD Lagrangian. A way to link the chiral
symmetry spontaneous breaking formalism at hadron level and that at quark level
is predicted. too. The application to nuclear matter shows that the approach is
quite successful in describing the properties of nuclear matter and the quark
condensate in it.


title: Pion double charge exchange on 4He

abstract:
  The doubly differential cross sections for the $^4$He$(\pi^+,\pi^-) 4p$
reaction were calculated using both a two-nucleon sequential single charge
exchange model and an intranuclear cascade code. Final state interactions
between the two final protons which were the initial neutrons were included in
both methods. At incident pion energies of 240 and 270 MeV the low-energy peak
observed experimentally in the energy spectrum of the final pions can be
understood only if the contribution of pion production is included. The
calculated cross sections are compared with data.


title:
A simple approach to the angular momentum distribution in the ground
  states of many-body systems

abstract:
  We propose a simple approach to predict the angular momentum I ground state
(I g.s.) probabilities of many-body systems that does not require the
diagonalization of hamiltonians with random interactions. This method is found
to be applicable to {\bf all} cases that have been discussed: even and odd
fermion systems (both in single-j and many-j shells), and boson (both sd and
sdg) systems. A simple relation for the highest angular momentum g.s.
probability is found. Furthermore, it is suggested for the first time that the
0g.s. dominance in boson systems and in even-fermion systems is given by
two-body interactions with specific features.


title: Pion-only, chiral light-front model of the deuteron

abstract:
  We investigate the symptoms of broken rotational invariance, caused by the
use of light front dynamics, for deuterons obtained using one- and
two-pion-exchange potentials. A large mass splitting between states with m=0
and m=1 is found for the deuteron obtained from the one-pion-exchange (OPE)
potential. The size of the splitting is smaller when the chiral
two-pion-exchange (TPE) potential is used. When the TPE potential constructed
without chiral symmetry is used, the deuteron becomes unbound. These results
arise from significant relativistic effects which are much larger than those of
the Wick-Cutkosky model because of the presence of the tensor force.


title: A microscopic framework for dynamical supersymmetry in nuclei

abstract:
  We discuss and explore new aspects of the generalized Dyson mapping of
nuclear collective superalgebras composed of an arbitrary fermion-pair algebra
and a set of single-fermion creation/annihilation operators. It is shown that a
direct consequence of the particular mapping procedure is the conservation of
the total number of ideal particles in the resulting boson-fermion system. This
provides a microscopic framework for the phenomenological supersymmetric models
based on the U(6/2Omega) dynamical superalgebras. Attention is paid to the
mapping of single-fermion creation and annihilation operators whose detailed
form cannot be determined on the phenomenological level. We derive the general
expansion of the single-fermion images that result from the similarity
transformation employed to ensure non-redundant bosonisation in the ideal
space. The method is then illustrated in an application to the SO(4) collective
algebra, a natural extension of the SU(2) seniority model.


title:
Mechanism of proton-$^3{\rm He} $ elastic backward scattering at
  intermediate energy

abstract:
  We provide systematic analysis of the differential cross section of the
proton-$^3{\rm He}$ elastic scattering at $\theta_{\rm cm}=180^{\circ}$ and at
$T_p<700$ MeV. Three mechanisms are discussed: 2N pair exchange in the triplet
and singlet spin states, pion exchange and direct mechanism. It is shown that t
Tp>150 MeV tree-body structure, including triplet and singlet states of the 2N
pair, becomes of great importance for understanding energy dependence of the
reaction observables. Prediction for the differential cross section and the
polarization correlation $C_{00nn} which can be studied now in experiment are
given.
  PACS number(s): 21.30.Cb, 21.30.-x, 25.40.Cm, 25.55.Ci


title: Nuclear Photoabsorption at Photon Energies between 300 and 850 Mev

abstract:
  We construct the formula for the photonuclear total absorption cross section
using the projection method and the unitarity relation. Our treatment is very
effective when interference effects in the absorption processes on a nucleon
are strong. The disappearance of the peak around the position of the $D_{13}$
resonance in the nuclear photoabsorption can be explained with the cooperative
effect of the interference in two-pion production processes,the Fermi motion,
the collision broadenings of $\Delta$ and $N^*$, and the pion distortion in the
nuclear medium. The change of the interference effect by the medium plays an
important role.


title: Strangeness in strongly interacting matter

abstract:
  This talk is devoted to review the field of strangeness production in
(ultra-)relativistic heavy ion collisions within our present theoretical
understanding. Historically there have been (at least) three major ideas for
the interest in the production of strange hadronic particles: (1) mass
modification of the kaons in a (baryon-)dense environment; (2) (early) K+ -
production probes the nuclear equation of state (EoS); (3) enhanced strangeness
production especially in the (multi-)strange (anti-)baryon channels as a signal
of quark gluon plasma (QGP) formation. As a guideline for the discussion I
employ the extensive experience with microscopic hadronic transport models. In
addition, I elaborate on the recent idea of antihyperon production solely by
means of multi-mesonic fusion-type reactions.


title:
Nonlocality of nucleon interaction and an anomalous off shell behavior
  of the two-nucleon amplitudes

abstract:
  The problem of the ultraviolet divergences that arise in describing the
nucleon dynamics at low energies is considered. By using the example of an
exactly solvable model it is shown that after renormalization the interaction
generating nucleon dynamics is nonlocal in time. Effects of such nonlocality on
low-energy nucleon dynamics are investigated. It is shown that nonlocality in
time of nucleon-nucleon interactions gives rise to an anomalous off-shell
behavior of the two-nucleon amplitudes that have significant effects on the
dynamics of many-nucleon systems.


title:
Nuclear magnetization distribution and hyperfine splitting in Bi$^{82+}$
  ion

abstract:
  Hyperfine splitting in Bi$^{82+}$ and Pb$^{81+}$ ions was calculated using
continuum RPA approach with effective residual forces. To fix the parameters of
the theory the nuclear magnetic dipole moments of two one- particle and two
one-hole nuclei around $^{208}$Pb were calculated using the same approach. The
contribution from velocity dependent two-body spin- orbit residual interaction
was calculated explicitly. Additionally, the octupole moment of $^{209}$Bi and
the hfs in muonic bismuth atom were calculated as well in the same approach.
All the calculated observables, except the electronic hfs in $^{209}$Bi, are in
good agreement with the data. We argue for more accurate measurement of the
octupole moment and the muonic hfs for $^{209}$Bi.


title: Kaon and Pion Fluctuations from Small Disoriented Chiral Condensates

abstract:
  Enhancement of omega and antiomega baryon production in Pb+Pb collisions at a
c.m. energy of 17 A GeV can be explained by the formation of many small
disoriented chiral condensate regions. This explanation implies that neutral
and charged kaons as well as pions must exhibit novel isospin fluctuations. We
compute the distribution of the fraction of neutral pions and kaons from such
regions. We then propose robust statistical observables that can be used to
extract the novel fluctuations from background contributions in pion and kaon
measurements at RHIC and LHC.


title: Anomalous anapole moment of an exotic nucleus

abstract:
  Using the information on the nuclear structure of exotic neutron-rich halo
nucleus $^{11}$Be, we evaluate the parity violating anapole moment in its
ground state. The resulting value $\kappa(^{11}$Be)$=0.17$ is fifteen times
bigger than the typical value of the anapole moment of a normal nucleus of the
same mass, and in fact exceeds by few times anapole moments of any known
neutron-odd nuclei (e.g., kappa(^{11}Be) > 2|\kappa(^{207}Pb)|. It is also few
times bigger than the neutral current contribution to the lepton-nucleus
interaction.


title: Neutron Radii in Mean-Field Models

abstract:
  Bulk nuclear observables such as charge radii and binding energies are well
described by both nonrelativistic and covariant mean-field models. However,
predictions of neutron radii, which are not tightly constrained by reliable
data, vary significantly. The nature of this variation is investigated using
correlations between basic properties of the models and the neutron skin
thickness in lead. The results suggest that conventional covariant models are
too limited. The study is guided by principles and insights of effective field
theory (EFT), such as power counting, and the relation of mean-field models to
a more general EFT approach to nuclei is discussed.


title:
The Calculation of Vacuum Properties from the Global Color Symmetry
  Model

abstract:
  A modified method for calculating the non-perturbative quark vacuum
condensates from the global color symmetry model is derived. Within this
approach it is shown that the vacuum condensates are free of ultraviolet
divergence which is different from previous studies. As a special, the
two-quark condensate and the mixed quark-gluon condensate are calculated. A
comparision with the results of the other nonperturbative QCD approaches is
given.


title:
Contributions of vector meson photoproduction to the
  Gerasimov-Drell-Hearn sum rule

abstract:
  An improved version of a recently developed quark model approach to vector
meson photoproduction is applied to the investigation of contributions of
vector meson photoproduction to the Gerasimov-Drell-Hearn (GDH) sum rule. We
find that the sum rule converges at a few GeV's. Contributions to the proton
channel are found to be small while to the neutron are relatively large.


title: The quark strange star in the enlarged Nambu-Jona-Lasinio model

abstract:
  The strange quark star is investigated within the enlarged SU(3)
Nambu-Jona-Lasinio (NJL). The stable quark star exists till maximal
configutation with rho_m=3.1, 10^15, g/cm^3 with M_m=1.61, M_Sun and R_m=8.74,
km is reached. Strange quarks appear for density above rho_c=9.84 g/cm^3 for
the quark star with radius R_c=8.003 km and M_c=0.77, M_Sun. The comparison of
a quark star properties obtained in the Quark Mean Field (QMF) approach to a
neutron star model constructed within the Relativistic Mean Field (RMF) theory
is presented.


title: Kinematical relativistic effects in $(\vec{e},e'\vec{N})$ reactions

abstract:
  Kinematical relativistic effects are analyzed within the plane-wave impulse
approximation for outgoing nucleon polarized responses in coincidence electron
scattering. Following recent approaches for non-relativistic reductions of the
electromagnetic current operator, here an exact treatment of the problem for
the transferred energy and momentum is presented. Rather than employing
existing non-relativistic expressions for the single-nucleon matrix elements,
in this work the response functions are expanded directly. Results are compared
for different kinematical situations with the fully-relativistic PWIA
calculation as well as with previous non-relativistic expansions. Off- and
`on-shell' prescriptions are also studied in detail, and a systematic analysis
of the various kinematical variables involved in the process is presented.


title:
RPWIA analysis of dynamical relativistic contributions in
  $^{16}O(\vec{e},e'\vec{p})$ reactions

abstract:
  Coincidence scattering of polarized electrons from nuclei with polarization
transfer to outgoing nucleons is studied within the context of relativistic
mean field theory. Effects introduced by the dynamical enhancement of the lower
components of the bound nucleon wave function are analyzed for the polarized
response functions and transferred polarization asymmetries assuming the
relativistic plane-wave impulse approximation (RPWIA). Results obtained by
projecting out the negative-energy components are compared with the
fully-relativistic calculation for proton knockout from $p_{1/2}$ and $p_{3/2}$
shells in $^{16}O$ for a variety of kinematic situations. The crucial role
played by the relativistic dynamics in some spin-dependent observables is
clearly manifested even for low/medium values of the missing momentum. The
degree to which knowledge about nucleon form factors can be extracted from
analyses of this type of process is also discussed.


title: Structure of Sn isotopes beyond N=82

abstract:
  We have performed shell-model calculations for 134,135Sn using a realistic
effective interaction derived from the CD-Bonn nucleon-nucleon potential.
Comparison shows that the calculated results for 134Sn are in very good
agreement with recent experimental data. This supports confidence in our
predictions of the hitherto unknown spectrum of 135Sn.


title:
Ordinary muon capture as a probe of virtual transitions of $\beta\beta$
  decay

abstract:
  A reliable theoretical description of double-beta-decay processes needs a
possibility to test the involved virtual transitions against experimental data.
Unfortunately, only the lowest virtual transition can be probed by the
traditional electron-capture or $\beta^-$-decay experiments. In this article we
propose that calculated amplitudes for many virtual transitions can be probed
by experiments measuring rates of ordinary muon capture (OMC) to the relevant
intermediate states. The first results from such experiments are expected to
appear soon. As an example we discuss the $\beta\beta$ decays of $^{76}$Ge and
$^{106}$Cd and the corresponding OMC for the $^{76}$Se and $^{106}$Cd nuclei in
the framework of the proton-neutron QRPA with realistic interactions. It is
found that the OMC observables, just like the $2\nu\beta\beta$-decay
amplitudes, strongly depend on the strength of the particle-particle part of
the proton-neutron interaction.


title: Phenomenological Description of the Yrast Lines

abstract:
  Analysis of the collective structure of 0^{+} states in terms of phonon
tations for great amount of nuclei is presented .It is shown that the
rotational bands built on these states strongly depend on their structure. The
spectrum of the bands is obtained by the application of the Nuclear Surface
Oscillation /NSO/ model and assumption of "Kassini form" for the nuclear shape.
The yrast lines energies can be successfully described by the crossing of the
different rotational "beta - bands", if the collective structure of these band
heads is properly taken into account.


title: Interpretation of the Wigner Energy as due to RPA Correlations

abstract:
  In a schematic model with equidistant fourfold degenerate single-nucleon
levels, a conventional isovector pairing force and a symmetry force, the RPA
correlation energy rises almost linearly with the isospin T, thus producing a
Wigner term in accordance with the empirical proportionality of the symmetry
energy to T(T+1).


title: High Energy Approaches To Low Energy Phenomena In Astrophysics

abstract:
  Studies in nuclear astrophysics have long been associated with long runs at
small accelerators, measuring ever-decreasing cross sections as one approached
(but rarely reached) the energy of reactions in stars. But in recent years
pioneering studies have shown that studies at high-energy accelerators can
often yield the same information, and in some important cases, provide
information not otherwise available. This is particularly so for studies of the
properties and reactions of the short-lived radioactive nuclei that play a
crucial role in explosive phenomena such as novae, supernovae, and neutron
stars. I'll give an overview of some of the possibilities, and then concentrate
on two extended examples: measurements of the rates of radioactive capture
reactions using Coulomb breakup reactions, and the relationship of charge
exchange cross sections and beta-decay strength for L = 1 transitions.


title: Phi meson propagation in a hot hadronic gas

abstract:
  The Hidden Local Symmetry Lagrangian is used to study the interactions of phi
mesons with other pseudoscalar and vector mesons in a hadronic gas at finite
temperature. We have found a significantly small phi mean free path (less than
2.4 fm at T > 170 MeV) due to large collision rates with rho mesons, kaons and
predominantly K* in spite of their heavy mass. This implies that phi mesons
produced after hadronization in relativistic heavy ion collisions will not
leave the hadronic system without scattering. The effect of these interactions
on the time evolution of the phi density in the expanding hadronic fireball is
investigated.


title: Wobbling Motion in Atomic Nuclei with Positive-Gamma Shapes

abstract:
  The three moments of inertia associated with the wobbling mode built on the
superdeformed states in 163Lu are investigated by means of the cranked shell
model plus random phase approximation to the configuration with an aligned
quasiparticle. The result indicates that it is crucial to take into account the
direct contribution to the moments of inertia from the aligned quasiparticle so
as to realize J_x > J_y in positive-gamma shapes. Quenching of the pairing gap
cooperates with the alignment effect. The peculiarity of the recently observed
163Lu data is discussed by calculating not only the electromagnetic properties
but also the excitation spectra.


title:
Cluster properties in relativistic quantum mechanics of N-particle
  systems

abstract:
  A general technique is presented for constructing a quantum theory of a
finite number of interacting particles satisfying Poincar\'e invariance,
cluster separability, and the spectral condition. Irreducible representations
and Clebsch-Gordan coefficients of the Poincar\'e group are the central
elements of the construction. A different realization of the dynamics is
obtained for each basis of an irreducible representation of the Poincar\'e
group. Unitary operators that relate the different realizations of the dynamis
are constructed. This technique is distinguished from other solutions of this
problem because it does not depend on the kinematic subgroups of Dirac's forms
of dynamics. Special basis choices lead to kinematic subgroups.


title: Atiyah-Manton Approach to Skyrmion Matter

abstract:
  We propose how to approach, and report on the first results in our effort
for, describing nuclear matter starting from the solitonic picture of baryons
which is supposed to represent QCD for large number of colors. For this
purpose, the instanton-skyrmion connection of Atiyah and Manton is exploited to
describe skyrmion matter. We first modify 't Hooft's multi-instanton solution
so as to suitably incorporate proper dynamical variables into the skyrmion
matter and then by taking these variables as variational parameters, we show
that they cover a configuration space sufficient to adequately describe the
ground state properties of nuclear matter starting from the skyrmion picture.
Our results turn out to be comparable to those so far found in different
numerical calculations, with our solution reaching stability at high density
for a crystal structure and obtaining a comparable value for the energy per
baryon at the minimum, thus setting the stage for the next step.


title: On freeze-out problem in hydro-kinetic approach to A+A collisions

abstract:
  A new method for evaluating spectra and correlations in the hydrodynamic
approach is proposed. It is based on an analysis of Boltzmann equations (BE) in
terms of probabilities for constituent particles to escape from the interacting
system. The conditions of applicability of Cooper-Frye freeze-out prescription
are considered within the method. The results are illustrated with a
non-relativistic exact solution of BE for expanding spherical fireball as well
as with approximate solutions for ellipsoidally expanding ones.


title: Final state interactions in omega photoproduction near threshold

abstract:
  Vector meson photoproduction and electroproduction have been suggested as a
tool to find or confirm the nucleon resonances. In order to extract more
reliable informations on the nucleon resonances, understanding the non-resonant
background is indispensable. We consider final state interactions in omega
photoproduction as a background production mechanism. For the intermediate
states, we consider nucleon--vector-meson and nucleon-pion channels. The role
of the final state interactions is discussed in omega meson photoproduction
near threshold.


title: Electromagnetic Transition Form Factors of Light Mesons

abstract:
  We study selected meson transition processes and associated form factors
within a model of QCD based on the Dyson--Schwinger equations truncated to
ladder-rainbow level. The infrared structure of the ladder-rainbow kernel is
described by two parameters; the ultraviolet behavior is fixed by the one-loop
renormalization group behavior of QCD. The work is restricted to the u and d
quark sector and allows a Poincare'-covariant study of the radiative decays:
rho -> pi + gamma, omega -> pi + gamma, and pi^0 -> gamma + gamma. Particular
attention is paid to the form factors for the associated transitions: gamma^* +
pi^0 -> gamma, gamma^* + pi^0 -> gamma^*, gamma^* + pi -> rho and gamma^* + rho
-> pi. The latter two processes are of interest as contributors to meson
electroproduction from hadronic targets away from the s-channel resonance
region. We use the present QCD model to explore limitations to the assumption
that coupling to a t-channel virtual qbar-q correlation can be modeled as meson
exchange.


title: ESC NN-Potentials in Momentum Space. I. PS-PS Exchange Potentials

abstract:
  A momentum space representation is derived for the Nijmegen
Extended-Soft-Core (ESC) interactions. The partial wave projection of this
representation is carried through, in principle for Two-Meson-Exchange (TME) in
general. Explicit results for the momentum space partial wave NN-potentials
from PS-PS-Exchange are given.


title: Final-state interactions in the response of nuclear matter

abstract:
  Final-state interactions in the response of a many-body system to an external
probe delivering large momentum are normally described using the eikonal
approximation, for the trajectory of the struck particle, and the frozen
approximation, for the positions of the spectators. We propose a generalization
of this scheme, in which the initial momentum of the struck particle is
explicitly taken into account. Numerical calculations of the nuclear matter
response at 1 $< |{\bf q}| <$ 2 GeV/c show that the inclusion of this momentum
dependence leads to a sizable effect in the low energy tail. Possible
implications for the analysis of existing electron-nucleus scattering data are
discussed.


title: ESC NN-Potentials in Momentum Space. II. Meson-Pair Exchange Potentials

abstract:
  The partial wave projection of the Nijmegen soft-core potential model for
Meson-Pair-Exchange (MPE) for NN-scattering in momentum space is presented.
Here, nucleon-nucleon momentum space MPE-potentials are NN-interactions where
either one or both nucleons contains a meson-pair vertex. Dynamically, the
meson-pair vertices can be viewed as describing in an effective way (part of)
the effects of heavy-meson exchange and meson-nucleon resonances. From the
point of view of ``duality,'' these two kinds of contribution are roughly
equivalent. Part of the MPE-vertices can be found in the chiral-invariant
phenomenological Lagrangians that have a basis in spontaneous broken chiral
symmetry. It is shown that the MPE-interactions are a very important component
of the nuclear force, which indeed enables a very succesful description of the
low and medium energy NN-data. Here we present a precise fit to the NN-data
with the extended-soft-core (ESC) model containing OBE-, PS-PS-, and
MPE-potentials. An excellent description of the NN-data for $T_{Lab} \leq 350$
MeV is presented and discussed. Phase shifts are given and a $\chi^2_{p.d.p.} =
1.15$ is reached.


title:
$Q^2$ Independence of $QF_2/F_1$, Poincare Invariance and the
  Non-Conservation of Helicity

abstract:
  A relativistic constituent quark model is found to reproduce the recent data
regarding the ratio of proton form factors, $F_2(Q^2)/F_1(Q^2)$. We show that
imposing Poincare invariance leads to substantial violation of the helicity
conservation rule, as well as an analytic result that the ratio
$F_2(Q^2)/F_1(Q^2)\sim 1/Q$ for intermediate values of $Q^2$.


title:
Stability and instability of a hot and dilute nuclear droplet. II.
  Dissipative isoscalar modes

abstract:
  Results on dissipative isoscalar modes of a hot and dilute nuclear droplet
are presented. As compared to the adiabatic limit (part I), realistic
dissipation yields a substantial reduction of the growth rates for all unstable
modes, while the area of spinodal instability in the ($\varrho$,T)-plane
remains unchanged. The qualitative features of multifragmentation through
spinodal decomposition as obtained in the adiabatic limit are not significantly
affected by dissipation.


title:
On the relation between the long-wave instability and the pion
  condensation in nuclear matter

abstract:
  The solutions to the zero-sound frequency equation and pion dispersion
equation are considered for the different values of the parameters of the
effective particle-hole interaction. The branches of solutions, responsible for
the long-wave instability [Pomeranchuk] of the nuclear matter \omega_P(k) are
presented for the both equations. It is shown that in the pion dispersion
equation the solutions \omega_P(k) result in the instability not only for
values of the spin-isospin constant g'\leq -1/2, violating stability criteria,
but for all g' < g'_p (|g'_p|\ll 1 and g'_p < 0). At g' > g'_p the branches
\omega_P(k) turn into the solutions responsible for pion condensation.


title:
Short-range correlations and meson exchange currents in photonucleon
  emission

abstract:
  One-nucleon emission processes induced by photon absorption are studied by
considering short-range correlations effects. At energies above the giant
resonance region the validity of the direct knock-out model has been tested by
comparison with continuum Random Phase Approximation results. Nucleon
re-scattering effects have been considered by using an optical potential. The
role of the electromagnetic convection, magnetization and meson exchange
currents has been investigated as a function of both excitation energy and
momentum transfer. The short-range correlation effects have been studied by
using various correlation functions. We found that the nucleon photo-emission
cross section is rather sensitive to the presence of short-range correlations
at large values of nucleon emission angle. In this region, however, the effects
of meson exchange currents are even larger than those produced by short-range
correlations.


title: Neutral-current neutrino reactions in the supernova environment

abstract:
  We study the neutral-current neutrino scattering for four nuclei in the iron
region. We evaluate the cross sections for the relevant temperatures during the
supernova core collapse and derive Gamow-Teller distributions from large-scale
shell-model calculations. We show that the thermal population of the excited
states significantly enhances the cross sections at low neutrino energies.
Calculations of the outgoing neutrino spectra indicate the prospect of neutrino
upscattering at finite temperatures. Both results are particularly notable in
even-even nuclei.


title: Fragment Distribution in Coexistence Phase of Supernova Matter

abstract:
  We propose a new nucleosynthesis process in which various nuclei are formed
through the liquid-gas phase transition of supernova matter as a preprocess of
the standard r-process, and study its possibility of realization qualitatively.
  In the relativistic mean field and statistical model calculations, we find
that this process may take place and help the later r-process to proceed.


title: Charmonium-hadron interactions from QCD

abstract:
  The heavy quark system is an excellent probe to learn about the QCD dynamics
at finite density. First, we discuss the properties of the $J/\psi$ and $D$
meson at finite nucleon density. We discuss why their properties should change
at finite density and then introduce an exact QCD relation among these hadron
properties and the energy momentum tensor of the medium. Second, we discuss
attempts to calculate charmonium-hadron total cross section using effective
hadronic models and perturbative QCD. We emphasize a recent calculation, where
the cross section is derived using QCD factorization theorem. We conclude by
discussing some challenges for SIS 200.


title: Coulomb Energy of Nuclei

abstract:
  The density functional determining the Coulomb energy of nuclei is calculated
to the first order in $e^2$. It is shown that the Coulomb energy includes three
terms: the Hartree energy; the Fock energy; and the correlation Coulomb energy
(CCE), which contributes considerably to the surface energy, the mass
difference between mirror nuclei, and the single-particle spectrum. A CCE-based
mechanism of a systematic shift of the single-particle spectrum is proposed. A
dominant contribution to the CCE is shown to come from the surface region of
nuclei. The CCE effect on the calculated proton drip line is examined, and the
maximum charge $Z$ of nuclei near this line is found to decrease by 2 or 3
units. The effect of Coulomb interaction on the effective proton mass is
analyzed.


title: Properties of Valence Nucleon Distributions for Halo Nuclei

abstract:
  With the binding energies and configurations determined experimentally, the
root-mean-square radii are calculated for a number of single-particle states by
numerically solving the Sch{\"o}rdinger equations. By studying the relations
between the radii and separation energies, the new scaling laws and necessary
conditions for neutron halos and proton halos are established, respectively.
Especially the existence region of true proton halos is pointed out. It is
found that the effects of short-distance behaviours of valence nucleons at the
edges of interaction potentials can not be disregarded. Moreover, by means of
the radii of interaction potentials, the contributions of outer parts are
estimated as the criterions of halos.


title:
Semimicroscopical description of the simplest photonuclear reactions
  accompanied by excitation of the giant dipole resonance in medium-heavy mass
  nuclei

abstract:
  A semimicroscopical approach is applied to describe photoabsorption and
partial photonucleon reactions accompanied by the excitation of the giant
dipole resonance (GDR). The approach is based on the continuum-RPA (CRPA) with
a phenomenological description for the spreading effect. The phenomenological
isoscalar part of the nuclear mean field, momentum-independent Landau-Migdal
particle-hole interaction, and separable momentum-dependent forces are used as
input quantities for the CRPA calculations. The experimental photoabsorption
and partial $(n,\gamma)$-reaction cross sections in the vicinity of the GDR are
satisfactorily described for $^{89}$Y, $^{140}$Ce and $^{208}$Pb target nuclei.
The total direct-neutron-decay branching ratio for the GDR in $^{48}$Ca and
$^{208}$Pb is also evaluated.


title: Superdense Matter

abstract:
  We review recent work on the phase structure of QCD at very high baryon
density. We introduce the phenomenon of color superconductivity and discuss the
use of weak coupling methods. We study the phase structure as a function of the
number of flavors and their masses. We also introduce effective theories that
describe low energy excitations at high baryon density. Finally, we study the
possibility of kaon condensation at very large baryon density.


title: Hadronic Transport Models

abstract:
  Hadronic transport models may be utilized to extract bulk nuclear properties.
Deduction of in-medium nucleon-nucleon cross sections and of nuclear viscosity
is discussed, as well as the extraction of momentum dependence of nucleonic
mean field. Moreover, determination of the nuclear incompressibility and of
constraints on the nuclear pressure at supranormal densities is described.


title: Nuclear shell effects near the r-process path

abstract:
  We have studied the evolution of the shell structure of nuclei near the
neutron drip line in the Relativistic Hartree-Bogoliubov (RHB) theory with the
vector self-coupling of omega meson. The experimental data on the shell effects
about the waiting-point nucleus $^{80}$Zn are reproduced successfully. It is
shown that the shell effects at N=82 near the r-process path remain strong. A
quenching exhibited by the HFB+SkP approach is shown not to be compatible with
the available data.


title: 3D Real-Space Calculation of the Continuum Response

abstract:
  We present that a linear response theory in the continuum can be easily
formulated with Absorbing Boundary Condition (ABC). The theory is capable of
describing continuum spectra and dynamical correlations. Application of the ABC
does not require the spherical symmetry and the method is suitable for mesh
representation in the real coordinate space. Isovector giant dipole resonances
in beryllium isotopes are studied with the time-dependent Hartree-Fock with the
Skyrme force in a three-dimensional mesh space with the ABC.


title: Relativistic vs. Non-relativistic Nuclear Models

abstract:
  Both the relativistic and non-relativistic model explain very well low-energy
nuclear phenomena, but in a physically different way from each other. There
seems to be no low-energy phenomenon to answer which model is more reasonable.
In order to explore a difference between two models, high momentum transfer
phenomena are investigated. First it is shown that the neutron spin-orbit
charge density in the relativistic model reproduces very well experimental data
on elastic electron scattering which have not been explained in the
non-relativistic model. Next it is predicted that the relativistic Coulomb sum
value is strongly quenched, compared with the non-relativistic one. This
quenching is owing to the anti-nucleon degrees of freedom, which make the
nucleon size larger and equivalently the vector-meson mass smaller in nuclear
medium. New experiment on the Coulomb sum values around the momentum transfer
1GeV is expected to distinguish the relativistic from the non-relativistic
model.


title: Excitation of Triple Giant Resonances in Heavy-Ion Reactions

abstract:
  We calculate the cross-section for the excitation and subsequent decay of
triple giant resonances(TGDR) in several nuclei excited with heavy ions.The
recently developed coherent plus incoherent theory for excitation in
conjunction with the hybrid decay model of Dias-Hussein-Adhikari are used for
the purpose.It is emphasized that the direct decay of TGDR is expected to
deviate appreciably from the harmonic limit especially at low bombarding
energies,owing to the incoherent contribution.


title: Overview of Neutrino-Nucleus Interactions

abstract:
  An overview of neutrino-nucleus interactions is presented. After a brief
discussion of theory and applications of detector response three examples are
discussed: i) Recent work on neutrino-deuteron reactions, ii) Probing
strangeness content of the nucleon with neutrinos, and iii) The role of
neutrino reactions in supernova dynamics and r-process nucleosynthesis.


title:
J/psi production in relativistic heavy ion collisions from a multi-phase
  transport model

abstract:
  Using A Multi-Phase Transport (AMPT) model, we study J/psi production from
interactions between charm and anti-charm quarks in initial parton phase and
between D and Dbar mesons in final hadron phase of relativistic heavy ion
collisions at the Relativistic Heavy Ion Collider (RHIC). Including also the
inverse reactions of J/psi absorption by gluons and light mesons, we find that
the net number of J/psi from the parton and hadron phases is smaller than that
expected from the superposition of initial nucleon-nucleon collisions, contrary
to the J/psi enhancement predicted by the kinetic formation model. The
production of J/psi is further suppressed if one includes the color screening
effect in the parton phase. We have also studied the dependence of J/psi
production on the charm quark mass and the effective charm meson mass.


title:
Dynamical particle-phonon couplings in proton emission from spherical
  nuclei

abstract:
  We present results of coupled-channels calculations which are performed to
understand the role of vibrational excitations of the daughter nucleus in
proton emission decay of spherical nuclei. It is shown that the experimental
decay rates from the 2$d_{3/2}$, 3$s_{1/2}$ and 1$h_{11/2}$ states in proton
emitting nuclei $^{160,161}$Re are reproduced simultaneously when the
quadrupole phonon excitation of the core nuclei is taken into account. We apply
the formalism also to the $^{145}$Tm nucleus and show that good agreement is
achieved with the recently measured branching ratio for the fine structure.


title: Low Mass Dileptons from Pb+Au Collisions at 158 AGeV

abstract:
  The medium modification of vector meson properties in hot/dense hadronic
matter and its role in explaining the CERES/NA45 dilepton data at different
centralities are discussed.


title: On the Theory of Nuclear Anapole Moments

abstract: We discuss the present state of the theory of nuclear anapole moments.


title:
In-medium vector meson properties and low-mass dilepton production from
  hot hadronic matter

abstract:
  The in-medium properties of the vector mesons are known to be modified
significantly in hot and dense hadronic matter due to vacuum polarisation
effects from the baryon sector in the Walecka model. The vector meson mass
drops significantly in the medium due to the effects of the Dirac sea. In the
variational approach adopted in the present paper, these effects are taken into
account through a realignment of the ground state with baryon condensates. Such
a realignment of the ground state becomes equivalent to summing of the baryonic
tadpole diagrams in the relativistic Hartree approximation (RHA). The
approximation scheme adopted here goes beyond RHA to include quantum effects
from the scalar meson and is nonperturbative and self--consistent. It includes
multiloop effects, thus corresponding to a different approximation as compared
to the one loop approximation of including scalar field quantum corrections. In
the present work, we study the properties of the vector mesons in the hot and
dense matter as modified due to such quantum correction effects from the baryon
as well as scalar meson sectors. These medium modifications of the properties
of the vector mesons are reflected, through the shifting and broadening of the
respective peaks, in the low mass dilepton spectra. There is broadening of the
peaks due to corrections from scalar meson quantum effects as compared to the
relativistic Hartree approximation. It is seen to be rather prominent for the
$\omega$ meson in the invariant mass plot.


title: Elastic e-d Scattering Data and the Deuteron Wave Function

abstract:
  What range of momentum components in the deuteron wave function are available
e d elastic scattering data sensitive to ? This question is addressed within
the context of a model calculation of the deuteron form factors, based on
realistic interactions and currents. It is shown that the data on the $A(q)$,
$B(q)$, and $T_{20}(q)$ observables at $q \leq 6$ fm$^{-1}$ essentially probe
momentum components up to $\simeq 4 m_\pi$.


title: Information entropy in fragmenting systems

abstract:
  The possibility of facing critical phenomena in nuclear fragmentation is a
topic of great interest. Different observables have been proposed to identify
such a behavior, in particular, some related to the use of information entropy
as a possible signal of critical behavior. In this work we critically examine
some of the most widespread used ones comparing its performance in bond
percolation and in the analysis of fragmenting Lennard Jones Drops.


title:
Quark mass density- and temperature- dependent model for bulk strange
  quark matter

abstract:
  It is shown that the quark mass density-dependent model can not be used to
explain the process of the quark deconfinement phase transition because the
quark confinement is permanent in this model. A quark mass density- and
temperature-dependent model in which the quark confinement is impermanent has
been suggested. We argue that the vacuum energy density B is a function of
temperature. The dynamical and thermodynamical properties of bulk strange quark
matter for quark mass density- and temperature-dependent model are discussed.


title: Scaling in the Lattice Gas Model

abstract:
  A good quality scaling of the cluster size distributions is obtained for the
Lattice Gas Model using the Fisher's ansatz for the scaling function. This
scaling identifies a pseudo-critical line in the phase diagram of the model
that spans the whole (subcritical to supercritical) density range. The
independent cluster hypothesis of the Fisher approach is shown to describe
correctly the thermodynamics of the lattice only far away from the critical
point.


title:
Space-time evolution of ultra-relativistic heavy ion collisions and
  hadronic spectra

abstract:
  The space-time evolution of the hot and dense matter formed after the
collisions of heavy nuclei at ultra-relativistic energies is investigated using
(3+1) dimensional hydrodynamical models. The effects of the spectral shift of
the hadronic properties are incorporated in the equation of state (EOS) of the
evolving matter. In-medium shift of hadronic properties are considered for
Quantum Hadrodynamics (QHD) and universal scaling scenarios. It is found that
the EOS for the hadronic matter for universal scaling of hadronic masses
(except pseudoscalar mesons) is similar to the recent lattice results. We
observe that the space-time volume of the hadronic matter at the freeze-out is
considerably different from the one when medium effects on the hadrons are
ignored. The sensitivity of the results on the initial radial velocity profile
is investigated. The transverse mass spectra of pions and protons of NA49
collaboration are analyzed.


title:
Non-local Potentials and Rotational Bands of Resonances in Ion
  Collisions

abstract:
  Sequences of rotational resonances (rotational bands) and corresponding
antiresonances are observed in ion collisions. In this paper we propose a
description which combines collective and single-particle features of cluster
collisions. It is shown how rotational bands emerge in many-body dynamics, when
the degeneracies proper of the harmonic oscillator spectra are removed by
adding interactions depending on the angular momentum. These interactions can
be properly introduced in connection with the exchange-forces and the
antisymmetrization, and give rise to a class of non-local potentials whose
spectral properties are analyzed in detail. In particular, we give a
classification of the singularities of the resolvent, which are associated with
bound states and resonances. The latter are then studied using an appropriate
type of collective coordinates, and a hydrodynamical model of the trapping,
responsible for the resonances, is then proposed. Accordingly, we derive, from
the uncertainty principle, a spin-width of the unstable states which can be
related to their angular lifetime.


title:
Ground State Properties of Many-Body Systems in the Two-Body Random
  Ensemble and Random Matrix Theory

abstract:
  We explore generic ground-state and low-energy statistical properties of
many-body bosonic and fermionic one- and two-body random ensembles (TBRE) in
the dense limit, and contrast them with Random Matrix Theory (RMT). Weak
differences in distribution tails can be attributed to the regularity or
chaoticity of the corresponding Hamiltonians rather than the particle
statistics. We finally show the universality of the distribution of the angular
momentum gap between the lowest energy levels in consecutive J-sectors for the
four models considered.


title: Baryon Wave Functions in Covariant Relativistic Quark Models

abstract:
  We derive covariant baryon wave functions for arbitrary Lorentz boosts.
Modeling baryons as quark-diquark systems, we reduce their manifestly covariant
Bethe-Salpeter equation to a covariant 3-dimensional form by projecting on the
relative quark-diquark energy. Guided by a phenomenological multigluon exchange
representation of a covariant confining kernel, we derive for practical
applications explicit solutions for harmonic confinement and for the MIT Bag
Model. We briefly comment on the interplay of boosts and center-of-mass
corrections in relativistic quark models.