title:
Entrainment coefficient and effective mass for conduction neutrons in
  neutron star crust: simple microscopic models

abstract:
  In the inner crust of a neutron star, at densities above the ``drip''
threshold, unbound ``conduction'' neutrons can move freely past through the
ionic lattice formed by the nuclei. The relative current density $n^i= n \bar
v^i$ of such conduction neutrons will be related to the corresponding mean
particle momentum $p_i$ by a proportionality relation of the form $n^i= {\cal
K}p^i$ in terms of a physically well defined mobility coefficient $\cal K$
whose value in this context has not been calculated before. Using methods from
ordinary solid state and nuclear physics, a simple quantum mechanical treatment
based on the independent particle approximation, is used here to formulate
$\cal K$ as the phase space integral of the relevant group velocity over the
neutron Fermi surface. The result can be described as an ``entrainment'' that
changes the ordinary neutron mass m to a macroscopic effective mass per neutron
that will be given -- subject to adoption of a convention specifying the
precise number density n of the neutrons that are considered to be ``free'' --
by $m_\star=n/{\cal K}$. The numerical evaluation of the mobility coefficient
is carried out for nuclear configurations of the ``lasagna'' and ``spaghetti''
type that may be relevant at the base of the crust. Extrapolation to the middle
layers of the inner crust leads to the unexpected prediction that $m_\star$
will become very large compared with m.


title:
An Introduction to Nuclear Supersymmetry: a Unification Scheme for
  Nuclei

abstract:
  The main ideas behind nuclear supersymmetry are presented, starting from the
basic concepts of symmetry and the methods of group theory in physics. We
propose new, more stringent experimental tests that probe the supersymmetry
classification in nuclei and point out that specific correlations should exist
for particle transfer intensities among supersymmetric partners. We also
discuss possible ways to generalize these ideas to cases where no dynamical
symmetries are present. The combination of these theoretical and experimental
studies may play a unifying role in nuclear phenomena.


title: A new look at nuclear supersymmetry though transfer experiments

abstract:
  Nuclear supersymmetry is reviewed and some of its applications and extensions
are discussed, together with a proposal for new, more stringent and precise
tests to probe the supersymmetry classification, in particular, correlations
between nuclei that belong to the same supermultiplet. The combination of these
theoretical and experimental studies may play a unifying role in nuclear
phenomena


title: Large-angle scattering and quasi-elastic barrier distributions

abstract:
  We study in detail the barrier distributions extracted from large-angle
quasi-elastic scattering of heavy ions at energies near the Coulomb barrier.
Using a closed-form expression for scattering from a single barrier, we compare
the quasi-elastic barrier distribution with the corresponding test function for
fusion. We examine the isocentrifugal approximation in coupled-channels
calculations of quasi-elastic scattering and find that for backward angles, it
works well, justifying the concept of a barrier distribution for scattering
processes. This method offers an interesting tool for investigating unstable
nuclei. We illustrate this for the $^{32}$Mg + $^{208}$Pb reaction, where the
quadrupole collectivity of the neutron-rich $^{32}$Mg remains to be clarified
experimentally.


title:
Production of QED pairs at small impact parameter in relativistic heavy
  ion collisions

abstract:
  The STAR collaboration at RHIC is measuring the production of
electron-positron pairs at small impact parameters, larger than but already
close to the range, where the ions interact strongly with each other. We
calculate the total cross section, as well as, differential distributions of
the pair production process with the electromagnetic excitation of both ions in
a semiclassical approach and within a lowest order QED calculation. We compare
the distribution of electron and positron with the one coming from the cross
section calculation without restriction on impact parameter. Finally we give an
outlook of possible results at the LHC.


title: Kaons and antikaons in hot and dense hadronic matter

abstract:
  The medium modification of kaon and antikaon masses, compatible with low
energy KN scattering data, are studied in a chiral SU(3) model. The mutual
interactions with baryons in hot hadronic matter and the effects from the
baryonic Dirac sea on the K(${\rm {\bar K}}$) masses are examined. The
in-medium masses from the chiral SU(3) effective model are compared to those
from chiral perturbation theory. Furthermore, the influence of these in-medium
effects on kaon rapidity distributions and transverse energy spectra as well as
the $K, \bar{K}$ flow pattern in heavy-ion collision experiments at 1.5 to 2
A$\cdot$GeV are investigated within the HSD transport approach. Detailed
predictions on the transverse momentum and rapidity dependence of directed flow
$v_1$ and the elliptic flow $v_2$ are provided for Ni+Ni at 1.93 A$\cdot$GeV
within the various models, that can be used to determine the in-medium $K^\pm$
properties from the experimental side in the near future.


title: Gamow and R-matrix Approach to Proton Emitting Nuclei

abstract:
  Proton emission from deformed nuclei is described within the non-adiabatic
weak coupling model which takes into account the coupling to
$\gamma$-vibrations around the axially-symmetric shape. The coupled equations
are derived within the Gamow state formalism. A new method, based on the
combination of the R-matrix theory and the oscillator expansion technique, is
introduced that allows for a substantial increase of the number of coupled
channels. As an example, we study the deformed proton emitter $^{141}$Ho.


title: Quark structure and nuclear effective forces

abstract:
  We formulate the quark meson coupling model as a many-body effective
Hamiltonian. This leads naturally to the appearance of many-body forces. We
investigate the zero range limit of the model and compare its Hartree-Fock
Hamiltonian to that corresponding to the Skyrme effective force. By fixing the
three parameters of the model to reproduce the binding and symmetry energy of
nuclear matter, we find that it allows a very satisfactory interpretation of
the Skyrme force.


title:
A proposed reaction channel for the synthesis of the superheavy nucleus
  Z = 109

abstract:
  We apply a statistical-evaporation model (HIVAP) to calculate the cross
sections of superheavy elements, mainly about actinide targets and compare with
some available experimental data. A reaction channel $^{30}$Si + $^{243}$Am is
proposed for the synthesis of the element Z = 109 and the cross section is
estimated.


title:
Further Development of the Improved QMD Model and its Applications to
  Fusion Reaction near Barrier

abstract:
  The Improved Quantum Molecular Dynamics model is further developed by
introducing new parameters in interaction potential energy functional based on
Skyrme interaction of SkM$^{*}$ and SLy series. The properties of ground states
of selected nuclei can be reproduced very well. The Coulomb barriers for a
series of reaction systems are studied and compared with the results of the
proximity potential. The fusion excitation functions for a series of fusion
reactions are calculated and the results are in good agreement with
experimental data.


title: Mass and Isotope Dependence of Limiting Temperatures for Hot Nuclei

abstract:
  The mass and isotope dependence of limiting temperatures for hot nuclei are
investigated. The predicted mass dependence of limiting temperatures is in good
agreement with data derived from the caloric curve data. The predicted isotope
distribution of limiting temperatures appears to be a parabolic shape and its
centroid is not located at the isotope on the $\beta$-stability line(T=0) but
at neutron-rich side. Our study shows that the mass and isotope dependence of
limiting temperatures depend on the interaction and the form of surface tension
and its isopin dependence sensitively.


title: Ambiguities in statistical calculations of nuclear fragmentation

abstract:
  The concept of freeze out volume used in many statistical approaches for
disassembly of hot nuclei leads to ambiguities. The fragmentation pattern and
the momentum distribution (temperature) of the emanated fragments are
determined by the phase space at the freeze-out volume where the interaction
among the fragments is supposedly frozen out. However, to get coherence with
the experimental momentum distribution of the charged particles, one introduces
Coulomb acceleration beyond this freeze-out. To be consistent, we investigate
the effect of the attractive nuclear force beyond this volume and find that the
possible recombination of the fragments alters the physical observables
significantly casting doubt on the consistency of the statistical model.


title: Probing the densities of the Sn isotopes

abstract:
  Proton and neutron densities have been obtained for the even-even isotopes of
Sn from $^{100}$Sn to $^{176}$Sn using a Hartree-Fock-Bogoliubov model with a
Skyrme interaction. The matter densities so defined have been used with
realistic nucleon-nucleon interactions in a folding model to specify optical
potentials for the elastic scattering of protons with energies in the range 40
to 200 MeV. Those potentials have been used to make predictions of the
differential cross sections and spin observables for proton scattering. As the
target mass increases, the emergence of the neutron skin in the Sn isotopes is
revealed by marked effects in the differential cross section. Comparisons with
available data show how similar scattering data for the neutron-rich isotopes
may provide constraints for the model structures.


title: Role of Fluctuations in the Linear Sigma Model with Quarks

abstract:
  We study the thermodynamics of the linear sigma model with constituent quarks
beyond the mean-field approximation. By integrating out the quark degrees of
freedom we derive an effective action for the meson fields which is then
linearized around the ground state including field fluctuations. We propose a
new method for performing exact averaging of complicated functions over the
meson field fluctuations. Both thermal and zero-point fluctuations are
considered. The chiral condensate and the effective meson masses are determined
self-consistently in a rigorous thermodynamic framework. At zero chemical
potential the model predicts a chiral crossover transition which separates two
distinct regimes: heavy quarks and light pions at low temperatures, but light
quarks and heavy mesons at high temperatures. The crossover becomes a first
order phase transition if the vacuum pion mass is reduced from its physical
value.


title:
Effects of in-medium cross-sections and optical potential on
  thermal-source formation in p+197Au reactions at 6.2-14.6 GeV/c

abstract:
  Effects of in-medium cross-sections and of optical potential on
pre-equilibrium emission and on formation of a thermal source are investigated
by comparing the results of transport simulations with experimental results
from the p+{197}Au reaction at 6.2-14.6 GeV/c. The employed transport model
includes light composite-particle production and allows for inclusion of
in-medium particle-particle cross-section reduction and of momentum dependence
in the particle optical-potentials. Compared to the past, the model
incorporates improved parameterizations of elementary high-energy processes.
The simulations indicate that the majority of energy deposition occurs during
the first ~25 fm/c of a reaction. This is followed by a pre-equilibrium
emission and readjustment of system density and momentum distribution toward an
equilibrated system. Good agreement with data, on the d/p and t/p yield ratios
and on the residue mass and charge numbers, is obtained at the time of ~ 65
fm/c from the start of a reaction, provided reduced in-medium cross-sections
and momentum-dependent optical potentials are employed in the simulations. By
then, the pre-equilibrium nucleon and cluster emission, as well as mean-field
readjustments, drive the system to a state of depleted average density,
rho/rho_{0} ~ 1/4-1/3 for central collisions, and low-to-moderate excitation,
i.e. the region of nuclear liquid-gas phase transition.


title: Nuclear Lattice Simulations with Chiral Effective Field Theory

abstract:
  We study nuclear and neutron matter by combining chiral effective field
theory with non-perturbative lattice methods. In our approach nucleons and
pions are treated as point particles on a lattice. This allows us to probe
larger volumes, lower temperatures, and greater nuclear densities than in
lattice QCD. The low energy interactions of these particles are governed by
chiral effective theory and operator coefficients are determined by fitting to
zero temperature few-body scattering data. Any dependence on the lattice
spacing can be understood from the renormalization group and absorbed by
renormalizing operator coefficients. In this way we have a realistic simulation
of many-body nuclear phenomena with no free parameters, a systematic expansion,
and a clear theoretical connection to QCD. We present results for hot neutron
matter at temperatures 20 to 40 MeV and densities below twice nuclear matter
density.


title:
New mean field theory with the parity and charge mixing for the pion in
  nuclei

abstract:
  We give a brief review on the important role of the pion-exchange interaction
characterized by the strong tensor force. In order to illustrate the role of
the pion, we have proposed a new mean field theory with the charge and parity
mixing, by which the pion is treated explicitly in the mean field framework. We
introduce the essence of the new mean field theory and illustrate the
calculated results of the pion (tensor force) correlation by taking the alpha
particle as an example.


title: Chiral Symmetry and Finite Pion Mean Field in Nuclei

abstract:
  We introduce the chiral symmetry in the description of finite nuclei with the
hope to unify the hadron and nuclear physics. This trial becomes possible by
introducing finite pion mean field, which contributes largely to enhance the
spin-orbit splitting so as to provide the j-j magic number. We discuss the
qualitative consequence of the finite pion mean field for various observables.


title:
Charge- and parity-projected Hartree-Fock study with the tensor force of
  light nuclei

abstract:
  We propose a mean field framework in which the charge and the parity
symmetries of a single-particle state are broken. We break these symmetries to
incorporate the correlation induced by the tensor force into a nuclear mean
field model. We perform the charge- and the parity projections before variation
and obtain a Hartree-Fock-like equation (charge- and parity-projected
Hartree-Fock equation), which is solved self-consistently. We apply the
Hartree-Fock-like equation to the alpha particle and find that, by breaking the
parity and the charge symmetries, the correlation induced by the tensor force
is obtained.


title:
Charge- and parity-projected Hartree-Fock method for the strong tensor
  correlation and its application to the alpha particle

abstract:
  We propose a new mean-field-type framework which can treat the strong
correlation induced by the tensor force. To treat the tensor correlation we
break the charge and parity symmetries of a single-particle state and restore
these symmetries of the total system by the projection method. We perform the
charge and parity projections before variation and obtain a Hartree-Fock-like
equation, which is solved self-consistently. We apply the Hartree-Fock-like
equation to the alpha particle and find that by breaking the parity and charge
symmetries, the correlation induced by the tensor force is obtained in the
projected mean-field framework. We emphasize that the projection before the
variation is important to pick up the tensor correlation in the present
framework.


title:
Neutrino neutral reaction on 4He, effects of final state interaction and
  realistic NN force

abstract:
  The inelastic neutral reaction of neutrino on 4He is calculated
microscopically, including full final state interaction among the four
nucleons. The calculation is performed using the Lorentz integral transform
(LIT) method and the hyperspherical-harmonic effective interaction approach
(EIHH), with a realistic nucleon-nucleon interaction. A detailed energy
dependent calculation is given in the impulse approximation. With respect to
previous calculations, this work predicts an increased reaction cross-section
by 10%-30% for neutrino temperature up to 15 MeV.


title: Modern theories of low-energy astrophysical reactions

abstract:
  We summarize recent ab initio studies of low-energy electroweak reactions of
astrophysical interest, relevant for both big bang nucleosynthesis and solar
neutrino production. The calculational methods include direct integration for
np radiative and pp weak capture, correlated hyperspherical harmonics for
reactions of A=3,4 nuclei, and variational Monte Carlo for A=6,7 nuclei.
Realistic nucleon-nucleon and three-nucleon interactions and consistent current
operators are used as input.


title:
New effective interaction for $pf$-shell nuclei and its implications for
  the stability of the $N$=$Z$=28 closed core

abstract:
  The effective interaction GXPF1 for shell-model calculations in the full $pf$
shell is tested in detail from various viewpoints such as binding energies,
electro-magnetic moments and transitions, and excitation spectra. The
semi-magic structure is successfully described for $N$ or Z=28 nuclei,
$^{53}$Mn, $^{54}$Fe, $^{55}$Co and $^{56,57,58,59}$Ni, suggesting the
existence of significant core-excitations in low-lying non-yrast states as well
as in high-spin yrast states. The results of $N=Z$ odd-odd nuclei, $^{54}$Co
and $^{58}$Cu, also confirm the reliability of GXPF1 interaction in the isospin
dependent properties. Studies of shape coexistence suggest an advantage of
Monte Carlo Shell Model over conventional calculations in cases where
full-space calculations still remain too large to be practical.


title:
Forward Rapidity Hadron Production in Deuteron Gold Collisions from
  Valence Quarks

abstract:
  We consider hadron production in deuteron gold collisions at RHIC in the
forward rapidity region. Treating the target nucleus as a Color Glass
Condensate and the projectile deuteron as a dilute system of valence quarks, we
obtain good agreement with the BRAHMS minimum bias data on charged hadron
production in the forward rapidity ($y=3.2$) and low $p_t$ region. We provide
predictions for neutral pion production in minimum bias deuteron gold
collisions in the forward rapidity region, $y=3.8$, measured by the STAR
collaboration at RHIC.


title:
Effects of nuclear correlations on the $^{16}$O$(e,e'pN)$ reactions to
  discrete final states

abstract:
  Calculations of the $^{16}$O$(e,e'pN)$ cross sections to the ground state and
first excited levels of the $^{14}$C and $^{14}$N nuclei are presented.
  The effects of nuclear fragmentation have been obtained in a self-consistent
approach and are accounted for in the determination of the two-nucleon removal
amplitudes.
  The Hilbert space is partitioned in order to compute the contribution of both
long- and short-range effects in a separate way.
  Both the two-proton and the proton-neutron emission cross sections have been
computed within the same models for the reaction mechanism and the contribution
from nuclear structure, with the aim of better comparing the differences
between the two physical processes.
  The $^{16}$O$(e,e'pp)$ reaction is found to be sensitive to short-range
correlations, in agreement with previous results. The $^{16}$O$(e,e'pn)$ cross
section to $1^+$ final states is dominated by the $\Delta$ current and tensor
correlations. For both reactions, the interplay between collective (long-range)
effects and short-range and tensor correlations plays an important role. This
suggests that the selectivity of $(e,e'pN)$ reactions to the final state can be
used to probe correlations also beyond short-range effects.


title:
New T=1 effective interactions for the f5/2 p3/2 p1/2 g9/2 model space;
  Implications for valence-mirror symmetry and seniority isomers

abstract:
  New shell model Hamiltonians are derived for the T=1 part of the residual
interaction in the f5/2 p3/2 p1/2 g9/2 model space based on the analysis and
fit of the available experimental data for 57Ni-78Ni isotopes and 77Cu-100Sn
isotones. The fit procedure, properties of the determined effective interaction
as well as new results for valence-mirror symmetry and seniority isomers for
nuclei near 78Ni and 100Sn are discussed.


title:
A systematic study of neutron magic nuclei with N = 8, 20, 28, 50, 82,
  and 126 in the relativistic mean field theory

abstract:
  We perform a systematic study of all the traditional neutron magic nuclei
with $N$ = 8, 20, 28, 50, 82, and 126, from the neutron drip line to the proton
drip line. We adopt the deformed relativistic mean field (RMF) theory as our
framework and treat pairing correlations by a simple BCS method with a
zero-range $\delta$-force. Remarkable agreement with the available experimental
data is obtained for the binding energies, the two- and one-proton separation
energies, and the nuclear charge radii. The calculated nuclear deformations are
compared with the available experimental data and the predictions of the FRDM
mass formula and the HFBCS-1 mass formula. We discuss, in particular, the
appearance of sub-shell magic nuclei by observing irregular behavior in the
two- and one-proton separation energies.


title: Chiral symmetry and resonances in QCD

abstract:
  We study the formation of resonances in terms of the chiral SU(3) Lagrangian.
At leading order parameter-free predictions are obtained for the scattering of
Goldstone bosons off any hadron once we insist on approximate crossing symmetry
of the unitarized scattering amplitude. A wealth of empirically established
resonances are recovered and so far unseen resonances are predicted. Here we
review in some detail the properties of light axial-vector mesons.


title:
Superscaling in Nuclei: A Search for Scaling Function Beyond the
  Relativistic Fermi Gas Model

abstract:
  We construct a scaling function $f(\psi^{\prime})$ for inclusive electron
scattering from nuclei within the Coherent Density Fluctuation Model (CDFM).
The latter is a natural extension to finite nuclei of the Relativistic Fermi
Gas (RFG) model within which the scaling variable $\psi^{\prime}$ was
introduced by Donnelly and collaborators. The calculations show that the
high-momentum components of the nucleon momentum distribution in the CDFM and
their similarity for different nuclei lead to quantitative description of the
superscaling in nuclei. The results are in good agreement with the experimental
data for different transfer momenta showing superscaling for negative values of
$\psi^{\prime}$, including those smaller than -1.


title:
S-wave pion nucleon scattering lengths from $\pi N$, pionic hydrogen and
  deuteron data

abstract:
  The isoscalar and isovector scattering lengths (b_0,b_1) are determined using
a unitarized coupled channel approach based on chiral Lagrangians. Using
experimental values of pionic hydrogen and deuterium as well as low energy pi N
scattering data, the free parameters of the model are calculated. Isospin
violation is incorporated to a certain extent by working with physical particle
masses. For the deuterium scattering length a_{pi-d} new significant
corrections concerning real and imaginary parts are evaluated, putting new
constraints from pi-d scattering on the values of (b_0,b_1). In particular,
dispersion corrections, the influence of the Delta(1232) resonance, crossed
terms and multiple scattering in a Faddeev approach are considered.


title:
Z(5): Critical point symmetry for the prolate to oblate nuclear shape
  phase transition

abstract:
  A critical point symmetry for the prolate to oblate shape phase transition is
introduced, starting from the Bohr Hamiltonian and approximately separating
variables for $\gamma=30^{\rm o}$. Parameter-free (up to overall scale factors)
predictions for spectra and B(E2) transition rates are found to be in good
agreement with experimental data for 194-Pt, which is supposed to be located
very close to the prolate to oblate critical point, as well as for its
neighbours (192-Pt, 196-Pt).


title:
E(5) and X(5) critical point symmetries obtained from Davidson
  potentials through a variational procedure

abstract:
  Davidson potentials of the form $\beta^2 +\beta_0^4/\beta^2$, when used in
the E(5) framework, bridge the U(5) and O(6) symmetries, while they bridge the
U(5) and SU(3) symmetries when used in the X(5) framework. Using a variational
procedure, we determine for each value of angular momentum $L$ thevalue of
$\beta_0$ at which the rate of change of various physical quantities (energy
ratios, intraband B(E2) ratios, quadrupole moment ratios) has a maximum, the
collection of the values of the physical quantity formed in this way being a
candidate for describing its behavior at the relevant critical point. Energy
ratios lead to the E(5) and X(5) results (whice correspond to an infinite well
potential in $\beta$), while intraband B(E2) ratios and quadrupole moments lead
to the E(5)-$\beta^4$ and X(5)-$\beta^4$ results, which correspond to the use
of a $\beta^4$ potential in the relevant framework. A new derivation of the
Holmberg-Lipas formula for nuclear energy spectra is obtained as a by-product.


title: Interrelationship of Isospin and Angular Momentum

abstract:
  It is noted that the simple interaction in isospin variables $a (1/4 -
t(i)\cdot t(j))$, in a single $j$ shell calculation, can also be written with
angular momentum variables. For the configuration $(j^2) J_A$ for even $J_A$
the isospin is one; for odd $J_A$ it is zero. Hence the above interaction can
also be written as $a (1 - (-1)^{J_A})/2$. For the I=0 state of an even-even Ti
isotope with $n$ neutrons, the hamiltonian matrix element of this interaction
is $\bra [J'J']_0 |H| [JJ]_0\ket/a = (n+1) \delta_{JJ'}
  - (n+1) (j^n Jj|\} j^{n+1} j)
  (j^n J'j|\} j^{n+1} j)$. The eigenvalues of this interaction can be found by
using the isospin form of the interaction. They are $(n+1)a$ for $T = |N-Z|/2$
and zero for $T = |N-Z|/2 + 2$. One can apply this to some extent to obtain the
number of pairs of nucleons with given total angular momentum $J_A$ in a given
Ti isotope.


title: Self-consistent description of vector-mesons in matter

abstract:
  We study the influence of the virtual pion cloud in nuclear matter at finite
densities and temperatures on the structure of the rho- and omega-mesons. The
in-matter spectral function of the pion is obtained within a selfconsistent
scheme of coupled Dyson equations where the coupling to the nucleon and the
Delta(1232)-isobar resonance is taken into account. The selfenergies are
determined using a two-particle irreducible (2PI) truncation scheme
(Phi-derivable approximation) supplemented by Migdal's short range correlations
for the particle-hole excitations. The so obtained spectral function of the
pion is then used to calculate the in-medium changes of the vector-meson
spectral functions. With increasing density and temperature a strong interplay
of both vector-meson modes is observed. The four-transversality of the
polarisation tensors of the vector-mesons is achieved by a projector technique.
The resulting spectral functions of both vector-mesons and, through vector
dominance, the implications of our results on the dilepton spectra are studied
in their dependence on density and temperature.


title: Hypernuclear structure from gamma-ray spectroscopy

abstract:
  The energies of p-shell hypernuclear gamma rays obtained from recent
experiments using the Hyperball at BNL and KEK are used to constrain the YN
interaction which enters into shell-model calculations that include both Lambda
and Sigma configurations.


title: Handling the Handbag Diagram in Compton Scattering on the Proton

abstract:
  Poincare invariance, gauge invariance, conservation of parity and time
reversal invariance are respected in an impulse approximation evaluation of the
handbag diagram. Proton wave functions, previously constrained by comparison
with measured form factors, that incorporate the influence of quark transverse
and orbital angular momentum (and the corresponding violation of proton
helicity conservation) are used. Computed cross sections are found to be in
reasonably good agreement with early measurements. The helicity correlation
between the incident photon and outgoing proton, $K_{LL}$, is both large and
positive at back angles. For photon laboratory energies of $\le$ 6 GeV, we find
that $K_{LL}\ne A_{LL}$, $D_{LL}\ne1$, and that the polarization $P$ can be
large.


title:
Near-threshold production of a0(980) mesons in the reaction pp -> d K^+
  \bar{K}^0

abstract:
  Using an effective Lagrangian approach as well as the Quark-Gluon Strings
Model we analyze near-threshold production of a0(980)-mesons in the reaction NN
-> d K \bar{K} as well as the background of non-resonant K\bar{K}-pair
production. We argue that the reaction pp -> d K^+ \bar{K}^0 at an energy
release Q<=100 MeV is dominated by the intermediate production of the
a0(980)-resonance. At larger energies the non-resonant K^+\bar{K}^0-pair
production - where the kaons are produced in a relative P-wave - becomes
important. Then effects of final-state interactions are evaluated in a
unitarized scattering-length approach and found to be in the order of a 20%
suppression close to threshold. Thus in present experiments at the Cooler
Synchrotron COSY-J\"ulich for Q<=107 MeV the a_0^+ signal can reliably be
separated from the non-resonant K^+\bar{K^0} background.


title:
Quasiparticle random phase approximation based on the relativistic
  Hartree-Bogoliubov model II: Nuclear spin and isospin excitations

abstract:
  The proton-neutron relativistic quasiparticle random phase approximation
(PN-RQRPA) is formulated in the canonical single-nucleon basis of the
relativistic Hartree-Bogoliubov (RHB) model, for an effective Lagrangian
characterized by density-dependent meson-nucleon couplings. The model includes
both the T=1 and T=0 pairing channels. Pair configurations formed from the
fully or partially occupied states of positive energy in the Fermi sea, and the
empty negative-energy states from the Dirac sea, are included in PN-RQRPA
configuration space. The model is applied to the analysis of charge-exchange
modes: isobaric analog resonances and Gamow-Teller resonances.


title: e+e- pair production from nucleon targets in the resonance region

abstract:
  We present consistent theoretical descriptions of the $\pi N \to e^+e^- N$
and $\gamma N \to e^+e^- N$ reactions on proton and neutron targets for total
center of mass energies $\sqrt s$ ranging between 1.50 GeV and 1.75 GeV. These
reactions are complementary to study the coupling of low-lying baryon
resonances to vector meson-nucleon channels. We show in particular how the
resonant structure of the amplitudes for both processes generates specific and
large quantum interferences between $\rho$- and $\omega$-meson decays into
$e^+e^-$ pairs. Data on the $\pi N \to e^+e^- N$ and $\gamma N \to e^+e^- N$
reactions are expected in the near future from the HADES program at GSI and
from dilepton studies with CLAS at JLab.


title:
Effects of phonon-phonon coupling on low-lying states in neutron-rich Sn
  isotopes

abstract:
  Starting from an effective Skyrme interaction we present a method to take
into account the coupling between one- and two-phonon terms in the wave
functions of excited states. The approach is a development of a finite rank
separable approximation for the quasiparticle RPA calculations proposed in our
previous work. The influence of the phonon-phonon coupling on energies and
transition probabilities for the low-lying quadrupole and octupole states in
the neutron-rich Sn isotopes is studied.


title: Regge Behavior of DIS Structure Functions

abstract:
  Building on previous works of the mid 1960's, we construct an integral
equation for forward elastic scattering (t=0) at arbitrary virtuality Q^2 and
large s=W^2. This equation sums the ladder production of massless intermediate
bosons to all orders, and the solution exhibits Regge behavior. The equation is
used to study scattering in a simple chi^2 phi scalar theory, where it is
solved appoximately and applied to the study of DIS at small x. We find that
the model can naturally describe the quark distribution in both the large x
region and the small x region dominated by Reggeon exchange.


title: Shell-model description of monopole shift in neutron-rich Cu

abstract:
  Variations in the nuclear mean-field, in neutron-rich nuclei, are
investigated within the framework of the nuclear shell model. The change is
identified to originate mainly from the monopole part of the effective two-body
proton-neutron interaction. Applications for the low-lying states in odd-$A$ Cu
nuclei are presented. We compare the results using both schematic and realistic
forces. We also compare the monopole shifts with the results obtained from
large-scale shell-model calculations, using the same realistic interaction, in
order to study two-body correlations beyond the proton mean-field variations.


title: Even Parity $\Theta$-Pentaquark and Stable Strange Nuclear Matter

abstract:
  The newly discovered exotic $\Theta$ baryon of mass 1540 MeV (and very small
width) truly has a very low mass, if it is a pentaquark system of even parity.
A schematic model in which the coherent interaction of $u\bar s$ and $d\bar s$
pairs leads to a very large residual (non-confining) attractive interaction is
introduced. This collective vibrational model accounts for the mass and small
decay width to the $KN$ channel, but yields a significant coupling to the
virtual $K^*N$ channel. The schematic model predicts an attractive
$\Theta$-nucleon interaction strong enough to bind a $\Theta$ particle to a
nucleus in a state that is stable against decay via strong interactions. The
discovery of $\Theta$-nuclei could be a definitive proof that the $\Theta$
parity is even.


title: Neutron beta decay in effective field theory

abstract:
  Radiative corrections to the lifetime and angular correlation coefficients of
neutron beta-decay are evaluated in effecitive field theory. We also evaluate
the lowest order nucleon recoil corrections, including weak-magnetism. Our
results agree with those of the long-range and model-independent part of
previous calculations. In an effective theory the model-dependent radiative
corrections are replaced by well-defined low-energy constants. The effective
field theory allows a systematic evaluation of higher order corrections to our
results to the extent that the relevant low-energy constants are known.


title: Cronin effect and geometrical shadowing in d+Au collisions: pQCD vs. CGC

abstract:
  Multiple initial state parton interactions in p(d)+A collisions are
calculated in a Glauber-Eikonal formalism, which incorporates the competing
pattern of low-pT suppression due geometrical shadowing, and a moderate-pT
Cronin enhancement of hadron spectra. Dynamical shadowing effects, which are
not included in the computation, may be extracted by comparing experimental
data to the baseline provided by the Glauber-Eikonal model. Data for neutral
pion production at midrapidity show absence of dynamical shadowing in the RHIC
energy range, sqrt(s)~20-200 GeV. Recent preliminary data at forward rapidity
are addressed, and their interpretation discussed.


title: Dilepton production in elementary and in heavy ion reactions

abstract:
  We present a unified description of the vector meson and dilepton production
in elementary and in heavy ion reactions. The production of vector mesons
($\rho,\omega,\phi$) is described via the excitation of nucleon resonances
($R$). The theoretical framework is an extended vector meson dominance model
(eVMD) for resonance decays $R\longmapsto NV$ with arbitrary spin which is
covariant and kinematically complete. The eVMD includes thereby excited vector
meson states in the transition form factors. The model has successfully been
applied to $\omega$ and $\phi$ production in $p+p$ reactions. The same model is
used to describe the dilepton production in elementary reactions where
corresponding data are well reproduced. However, when the model is applied to
heavy ion reactions in the BEVALAC/SIS energy range the experimental dilepton
spectra measured by the DLS Collaboration are significantly underestimated at
small invariant masses. In view of this fact we discuss further medium effects:
One is a substantial collisional broadening of the $\rho$ and in particular of
the $\omega$ meson in the vicinity of the $\rho/\omega$-peak. The second medium
effect is the destruction of quantum interference in a dense medium. A
decoherent dilepton emission through vector mesons decays enhances the
corresponding low mass dilepton yield in heavy ion reactions and improves the
agreement with existing data.


title: On the atomic resonances in the $0 \nu 2EC$ transitions

abstract:
  The nuclear method to discover Majorana neutrinos is the neutrinoless double
$ \beta $ decay. An interesting alternative is offered by the inverse process,
neutrinoless radiative double electron capture, accompanied by a photon
emission. Two different mechanisms seem plausible: the magnetic type radiation
by an initial electron and the resonant electric type radiation by the final
atom. The physical background for these processes is calculated.


title:
Quantum effect in the diffusion along a potential barrier: Comments on
  the synthesis of superheavy elements

abstract:
  We discuss a quantum effect in the diffusion process by developing a theory,
which takes the finite curvature of the potential field into account. The
transport coefficients of our theory satisfy the well-known
fluctuation-dissipation theorem in the limit of Markovian approximation in the
cases of diffusion in a flat potential and in a potential well. For the
diffusion along a potential barrier, the diffusion coefficient can be related
to the friction coefficient by an analytic continuation of the
fluctuation-dissipation theorem for the case of diffusion along a potential
well in the asymptotic time, but contains strong non-Markovian effects at short
times. By applying our theory to the case of realistic values of the
temperature, the barrier curvature, and the friction coefficient, we show that
the quantum effects will play significant roles in describing the synthesis of
superheavy elements, i.e., the evolution from the fusion barrier to the
conditional saddle, in terms of a diffusion process. We especially point out
the importance of the memory effect, which increases at lower temperatures. It
makes the net quantum effects enhance the probability of crossing the
conditional saddle.


title: Final-State Interaction as the Origin of the Cronin Effect

abstract:
  Instead of adhering to the usual explanation of the Cronin effect in terms of
the broadening of the parton transverse momentum in the initial state, we show
that the enhancement of hadron production at moderate $p_T$ in d+Au collisions
is due to the recombination of soft and shower partons in the final state. Such
a mechanism can readily explain the decrease of the Cronin effect with
increasing rapidity. Furthermore, the effect should be larger for protons than
for pions.


title: Some Recent Topics on Possible Chiral Restoration in Nuclear Medium

abstract:
  Some topics are introduced on possible evidences of chiral restoration in
nuclei and related ones. The topics include the $\sigma$-mesonic mode in
nuclei, the vector mesons in a nuclear matter, deeply bound pionic and Kaonic
nuclei with a discussion on the nature of $\Lambda(1405)$. Other related topics
are briefly mentioned. An emphasis is put on that phenomena even in finite
nuclei with normal and sub-normal nuclear density, as will be explored in the
new project in GSI and possibly in J-PARC, are interesting for physics of
finite-density QCD.


title: Isoscaling in the Lattice Gas Model

abstract:
  The isoscaling behavior is investigated using the isotopic/isobaric yields
from the equilibrated thermal source which is prepared by the lattice gas model
for lighter systems with A = 36. The isoscaling parameters $\alpha$ and
-$\beta$ are observed to drop with temperature. The difference of neutron and
proton chemical potential shows a turning point around 5 MeV where the liquid
gas phase transition occurs in the model. The relative free neutron or proton
density shows a nearly linear relation with the N/Z (neutron to proton ratio)
of system and the isospin fractionation is observed.


title: Parity violation in deuteron photo-disintegration

abstract:
  We analyze the energy dependence for two types of parity-non-conserving
  (PNC) asymmetries in the reaction $\gamma D\to np$ in the near-threshold
region. The first one is the asymmetry in reaction with circularly polarized
photon beam and unpolarized deuteron target. The second one corresponds to
those with an unpolarized photon beam and polarized target. We find that the
two asymmetries have quite different energy dependence, and their shapes are
sensitive to the PNC-meson exchange coupling constants.
  The predictions for the future possible experiments to provide definite
constraints for the PNC-coupling constants are discussed.


title: Stopping and Isospin Equilibration in Heavy Ion Collisions

abstract:
  We investigate the density behaviour of the symmetry energy with respect to
isospin equilibration in the combined systems $Ru(Zr)+Zr(Ru)$ at relativistic
energies of 0.4 and $1.528 AGeV$. The study is performed within a relativistic
framework and the contribution of the iso-vector, scalar $\delta$ field to the
symmetry energy and the isospin dynamics is particularly explored. We find that
the isospin mixing depends on the symmetry energy and a stiff behaviour leads
to more transparency. The results are also nicely sensitive to the "fine
structure" of the symmetry energy, i.e. to the covariant properties of the
isovector meson fields. The isospin tracing appears much less dependent on the
in-medium neutron-proton cross-sections ($\sigma_{np}$) and this makes such
observable very peculiar for the study of the isovector part of the nuclear
equation of state. Within such a framework, comparisons with experiments
support the introduction of the $\delta$ meson in the description of the
iso-vector equation of state.


title: Missing levels in correlated spectra

abstract:
  Complete spectroscopy (measurements of a complete sequence of consecutive
levels) is often considered as a prerequisite to extract fluctuation properties
of spectra. It is shown how this goal can be achieved even if only a fraction
of levels are observed. The case of levels behaving as eigenvalues of random
matrices, of current interest in nuclear physics, is worked out in detail.


title: Effect of hard processes on momentum correlations

abstract:
  The effect of hard processes to be encountered in HBT studies at the Large
Hadron Collider have been studied. A simple simulation has allowed us to
generate momentum correlations involving jet particles as well as particles
originating from the kinetic freeze out and to compare them to a simple
theoretical model which has been developed. The first results on the effect of
hard processes on the correlation function for the case of jet quenching are
presented.


title:
Acceptance Corrections and Extreme-Independent Models in Relativistic
  Heavy Ion Collisions

abstract:
  Kopeliovich's suggestion [nucl-th/0306044] to perform nuclear geometry
(Glauber) calculations using different cross sections according to the
experimental configuration is quite different from the standard practice of the
last 20 years and leads to a different nuclear geometry definition for each
experiment. The standard procedure for experimentalists is to perform the
nuclear geometry calculation using the total inelastic N-N cross section, which
results in a common nuclear geometry definition for all experiments. The
incomplete acceptance of individual experiments is taken into account by
correcting the detector response for the probability of measuring zero for an
inelastic collision, which can often be determined experimentally. This clearly
separates experimental issues such as different acceptances from theoretical
issues which should apply in general to all experiments. Extreme-Independent
models are used to illustrate the conditions for which the two methods give
consistent or inconsistent results.


title:
Parity Nonconservation in the Photodisintegration of the Deuteron at Low
  Energy

abstract:
  The parity-nonconserving asymmetry in the deuteron photodisintegration,
$\vec{\gamma}+d\to n+p$, is considered with the photon energy ranged up to 10
MeV above the threshold. The aim is to improve upon a schematic estimate
assuming the absence of tensor as well as spin-orbit forces in the
nucleon-nucleon interaction. The major contributions are due to the
vector-meson exchanges, and the strong suppression of the pion-exchange
contribution is confirmed. A simple argument, going beyond the observation of
an algebraic cancellation, is presented. Contributions of meson-exchange
currents are also considered, but found to be less significant.


title: Relativistic NN scattering without partial wave decomposition

abstract:
  We consider the covariant Spectator equation with a One Boson Exchange (OBE)
kernel, and apply it to the NN system. Relativistic effects such as retardation
and negative-energy state components are included in that equation. We develop
a method, based on the Pad\'e method, to solve the Spectator equation without
partial wave decomposition. The convergence of the partial wave decomposition
series is tested as a function of the energy. The on- and off-mass-shell
amplitudes are calculated. The NN interaction was fitted to the differential
cross section for NN scattering, in the energy range below the pion production
threshold.


title: Towards Density Functional Calculations from Nuclear Forces

abstract:
  We propose a method for microscopic calculations of nuclear ground-state
properties in the framework of density functional theory. We discuss how the
density functional is equivalent to the effective action for the density,
thereby establishing a constructive framework for density functional
calculations from nuclear forces. The presented approach starts from
non-interacting nucleons in a background potential (a simple approximation for
the mean field). The nuclear forces are then gradually turned on, while the
background potential is removed. The evolution equation yields the ground-state
energy and density of a system of interacting nucleons, including
exchange-correlations beyond the RPA approximation. The method can start from
non-local low momentum (V_{low k}) or chiral interactions.


title: Aspects and consequences of a dressed-quark-gluon vertex

abstract:
  Features of the dressed-quark-gluon vertex and their role in the gap and
Bethe-Salpeter equations are explored. It is argued that quenched lattice data
indicate the existence of net attraction in the colour-octet projection of the
quark-antiquark scattering kernel. This attraction affects the uniformity with
which solutions of truncated equations converge pointwise to solutions of the
complete gap and vertex equations. For current-quark masses less than the scale
set by dynamical chiral symmetry breaking, the dependence of the
dressed-quark-gluon vertex on the current-quark mass is weak. The study employs
a vertex model whose diagrammatic content is explicitly enumerable. That
enables the systematic construction of a vertex-consistent Bethe-Salpeter
kernel and thereby an exploration of the consequences for the strong
interaction spectrum of attraction in the colour-octet channel. With rising
current-quark mass the rainbow-ladder truncation is shown to provide an
increasingly accurate estimate of a bound state's mass. Moreover, the
calculated splitting between vector and pseudoscalar meson masses vanishes as
the current-quark mass increases, which argues for the mass of the pseudoscalar
partner of the \Upsilon(1S) to be above 9.4 GeV. The absence of
colour-antitriplet diquarks from the strong interaction spectrum is contingent
upon the net amount of attraction in the octet projected quark-antiquark
scattering kernel. There is a window within which diquarks appear. The amount
of attraction suggested by lattice results is outside this domain.


title:
Analytic continuation of single-particle resonance energy and wave
  function in relativistic mean field theory

abstract:
  Single-particle resonant states in spherical nuclei are studied by an
analytic continuation in the coupling constant (ACCC) method within the
framework of the self-consistent relativistic mean field (RMF) theory. Taking
the neutron resonant state $\nu 1g_{9/2}$ in $^{60}$Ca as an example, we
examine the analyticity of the eigenvalue and eigenfunction for the Dirac
equation with respect to the coupling constant by means of a $\pade$
approximant of the second kind. The RMF-ACCC approach is then applied to
$^{122}$Zr and, for the first time, this approach is employed to investigate
both the energies, widths and wave functions for $l\ne 0$ resonant states close
to the continuum threshold. Predictions are also compared with corresponding
results obtained from the scattering phase shift method.


title:
Connection between the Largest Lyapunov Exponent, Density Fluctuation
  and Multifragmentation in Excited Nuclear Systems

abstract:
  Within a quantum molecular dynamics model we calculate the largest Lyapunov
exponent (LLE), density fluctuation and mass distribution of fragments for a
series of nuclear systems at different initial temperatures. It is found that
the $LLE$ peaks at the temperature ("critical temperature") where the density
fluctuation reaches a maximal value and the mass distribution of fragments is
best fitted by the Fisher's power law from which the critical exponents for
mass and charge distribution are obtained. The time-dependent behavior of the
LLE and density fluctuation is studied. We find that the time scale of the
density fluctuation is much longer than the inverse LLE, which indicates that
the chaotic motion can be well developed during the process of fragment
formation. The finite-size effect on "critical temperature" for nuclear systems
ranging from Calcium to superheavy nuclei is also studied.


title:
Microscopic calculation of the interaction cross section for stable and
  unstable nuclei based on the nonrelativistic nucleon-nucleon t-matrix

abstract:
  Fully quantal calculations of the total reaction cross sections \sigR and
interaction cross sections \sigI, induced by stable and unstable He, Li, C and
O isotopes on $^{12}$C target at $E_{\rm lab}\approx 0.8$ and 1 GeV/nucleon
have been performed, for the first time, in the distorted wave impulse
approximation (DWIA) using the microscopic \emph{complex} optical potential and
inelastic form factors given by the folding model. Realistic nuclear densities
for the projectiles and $^{12}$C target as well as the complex $t$-matrix
parameterization of free nucleon-nucleon interaction by Franey and Love were
used as inputs of the folding calculation. Our \emph{parameter-free} folding +
DWIA approach has been shown to give a very good account (within 1--2%) of the
experimental \sigI measured at these energies for the stable, strongly bound
isotopes. With the antisymmetrization of the dinuclear system properly taken
into account, this microscopic approach is shown to be more accurate than the
simple optical limit of Glauber model that was widely used to infer the nuclear
radii from the measured \sigI. Therefore, the results obtained for the nuclear
radii of neutron-rich isotopes under study can be of interest for further
nuclear structure studies.


title:
$\Lambda\Lambda$-$\Xi N$-$\Sigma\Sigma$ coupling in
  $^{~6}_{\Lambda\Lambda}$He with the Nijmegen soft-core potentials

abstract:
  The $\Lambda\Lambda$-$\Xi N$-$\Sigma\Sigma$ coupling in
$^{~6}_{\Lambda\Lambda}$He is studied with the [$\alpha$ + $\Lambda$ +
$\Lambda$] + [$\alpha$ + $\Xi$ + $N$] + [$\alpha$ + $\Sigma$ + $\Sigma$] model,
where the $\alpha$ particle is assumed as a frozen core. We use the Nijmegen
soft-core potentials, NSC97e and NSC97f, for the valence baryon-baryon part,
and the phenomenological potentials for the $\alpha-B$ parts ($B$=$N$,
$\Lambda$, $\Xi$ and $\Sigma$). We find that the calculated $\Delta
B_{\Lambda\Lambda}$ of $^{~6}_{\Lambda\Lambda}$He for NSC97e and NSC97f are,
respectively, 0.6 and 0.4 MeV in the full coupled-channel calculation, the
results of which are about half in comparison with the experimental data,
$\Delta B^{exp}_{\Lambda\Lambda}=1.01\pm0.20^{+0.18}_{-0.11}$ MeV.
Characteristics of the $S=-2$ sector in the NSC97 potentials are discussed in
detail.


title:
Kaon-antikaon nuclear optical potentials and the kappa meson in the
  nuclear medium

abstract:
  We study the properties of the kappa meson in the nuclear medium, starting
from a chiral unitary model of S-wave, I=1/2 K-pi scattering, which describes
the elastic K-pi phase shifts and generates a pole in the amplitude. Medium
effects are considered by including pion and kaon selfenergies. We explore the
changes in the kappa pole position and in the K-pi scattering amplitude at
finite density, with two different models for the kaon selfenergy.


title: Nuclear halo and the coherent nuclear interaction

abstract:
  The unusual structure of Li11, the first halo nucleus found, is analyzed by
the Preparata model of nuclear structure. By applying Coherent Nucleus Theory,
we obtain an interaction potential for the halo-neutrons that rightly
reproduces the fundamental state of the system.


title:
Nuclear Superfluidity and Specific Heat in the Inner Crust of Neutron
  Stars

abstract:
  We analyse the temperature dependence of pairing correlations in the inner
crust matter of neutron stars. The study is done in a finite-temperature HFB
approach and by using a zero range pairing force adjusted to the pairing
properties of infinite neutron matter. Within the same approach we investigate
how the specific heat of the inner crust depends on temperature, matter
inhomogeneity, and the assumption used for the pairing force. It is shown that
in a physical relevant range of densities the pairing properties of inner crust
matter depend significantly on temperature. The finite-temperature HFB
calculations show also that the specific heat is rather sensitive to the
presence of nuclear clusters inside the inner crust. However, the most dramatic
change of the specific heat is determined by the scenario used for the neutron
matter superfluidity.


title: Consequences of wall stiffness for a beta-soft potential

abstract:
  Modifications of the infinite square well E(5) and X(5) descriptions of
transitional nuclear structure are considered. The eigenproblem for a potential
with linear sloped walls is solved. The consequences of the introduction of
sloped walls and of a quadratic transition operator are investigated.


title:
Magic numbers for superheavy nuclei in relativistic continuum
  Hartree-Bogoliubov theory

abstract:
  The magic proton and neutron numbers are searched in the superheavy region
with proton number $Z$=100 - 140 and neutron number $N$= ($Z$+30) - (2$Z$+32)
by the relativistic continuum Hartree-Bogoliubov (RCHB) theory with
interactions NL1, NL3, NLSH, TM1, TW99, DD-ME1, PK1, and PK1R. Based on the
two-nucleon separation energies $S_{2p}$ and $S_{2n}$, the two-nucleon gaps
$\delta_{2p}$ and $\delta_{2n}$, the shell correction energies $E_{shell}^{p}$
and $E_{shell}^{n}$, the pairing energies $E_{pair}^{p}$ and $E_{pair}^{n}$,
and the pairing gaps $\Delta_{p}$ and $\Delta_{n}$, $Z$=120, 132, and 138 and
$N$=172, 184, 198, 228, 238, and 258 are suggested to be the magic numbers
within the present approach. The $\alpha$-decay half-lives are also discussed.
In addition, the potential energy surfaces of possible doubly magic nuclei are
obtained by the deformation-constrained relativistic mean field (RMF) theory,
and the shell effects stabilizing the nuclei are investigated. Furthermore, the
formation cross sections of $^{292}_{172}$120 and $^{304}_{184}$120 at the
optimal excitation energy are estimated by a phenomenological cold fusion
reactions model with the structure information extracted from the constrained
RMF calculation.


title: On the usefulness of the spectral function concept

abstract:
  The usefulness of the spectral function S in the process 3He(e,e'N) has been
investigated in a kinematical regime constrained by the conditions that the
three-nucleon center-of-mass energy is less than 150 MeV and the magnitude of
the three-momentum transfer smaller than 600 MeV/c. Results based on a full
treatment of the final state interaction are compared to the spectral function
approximation. In the case of proton knockout in the direction of the photon
kinematical conditions have been identified where both response functions, RL
and RT, can be well approximated by S. These conditions occur for certain low
missing momenta and missing energies but not in all cases. So care is required.
In case of neutron knockout only RT is a candidate for an approximate treatment
by S. In the case of RL the concept of using S is not valid in the studied
kinematical regime. This does not exclude the possibility that beyond that
regime it might be useful. Possible applications using S for the extraction of
electromagnetic form factors of the nucleons are pointed out.


title: Role of 2p-2h MEC excitations in superscaling

abstract:
  Following recent studies of inclusive electron scattering from nuclei at high
energies which focused on two-nucleon emission mediated by meson-exchange
currents, in this work the superscaling behavior of such contributions is
investigated. Comparisons are made with existing data below the quasielastic
peak where at high momentum transfers scaling of the second kind is known to be
excellent and scaling of the first kind is good, in the proximity of the peak
where both 1p-1h and 2p-2h contributions come into play, and above the peak
where inelasticity becomes important and one finds scaling violations of the
two kinds.


title:
Is friction responsible for the reduction of fusion rates far below the
  Coulomb barrier?

abstract:
  The fusion of two interacting heavy ions traditionally has been interpreted
in terms of the penetration of the projectile into the target. Observed rates
well below the Coulomb barrier are considerably lower than estimates obtained
from penetration factors. One approach in the analysis of the data invokes
coupling to non-elastic channels in the scattering as the source of the
depletion. Another is to analyze those data in terms of tunneling in
semi-classical models, with the observed depletion being taken as evidence of a
``friction'' under the barrier. A complementary approach is to consider such
tunneling in terms of a fully quantal model. We investigate tunneling with both
one-dimensional and three-dimensional models in a fully quantal approach to
investigate possible sources for such a friction. We find that the observed
phenomenon may not be explained by friction. However, we find that under
certain conditions tunneling may be enhanced or diminished by up to 50%, which
finds analogy with observation, without the invocation of a friction under the
barrier.


title:
Violation and persistence of the K-quantum number in warm rotating
  nuclei

abstract:
  The validity of the K-quantum number in rapidly rotating warm nuclei is
investigated as a function of thermal excitation energy U and angular momentum
I, for the rare-earth nucleus 163Er. The quantal eigenstates are described with
a shell model which combines a cranked Nilsson mean-field and a residual
two-body interaction, together with a term which takes into account the angular
momentum carried by the K-quantum number in an approximate way. K-mixing is
produced by the interplay of the Coriolis interaction and the residual
interaction; it is weak in the region of the discrete rotational bands (U
\lesim 1MeV), but it gradually increases until the limit of complete violation
of the K-quantum number is approached around U \sim 2 - 2.5 MeV. The calculated
matrix elements between bands having different K-quantum numbers decrease
exponentially as a function of $\Delta K$, in qualitative agreement with recent
data.


title: 1S0 Proton and Neutron Superfluidity in beta-stable Neutron Star Matter

abstract:
  We investigate the effect of a microscopic three-body force on the proton and
neutron superfluidity in the $^1S_0$ channel in $\beta$-stable neutron star
matter. It is found that the three-body force has only a small effect on the
neutron $^1S_0$ pairing gap, but it suppresses strongly the proton $^1S_0$
superfluidity in $\beta$-stable neutron star matter.


title:
Ground state properties of rare-earth nuclei in the relativistic
  Hartree-Bogoliubov model with density-dependent meson-nucleon couplings

abstract:
  The relativistic mean-field effective interaction with density-dependent
meson-nucleon couplings DD-ME1 is tested in the calculation of deformed nuclei.
Ground-state properties of six isotopic chains ($60\le Z \le 70$) in the region
of rare-earth nuclei are calculated by using the relativistic
Hartree-Bogoliubov (RHB) model with the DD-ME1 mean-field interaction, and with
the Gogny D1S force for the pairing interaction. Results of fully
self-consistent RHB calculations for the total binding energies, charge isotope
shifts and quadrupole deformation parameters are compared with the available
empirical data.


title:
Statistical fluctuations of ground-state energies and binding energies
  in nuclei

abstract:
  The statistical fluctuations of the ground-state energy and of the binding
energy of nuclei are investigated using both perturbation theory and
supersymmetry. The fluctuations are induced by the experimentally observed
stochastic behavior of levels in the vicinity of neutron threshold. The results
are compared with a recent analysis of binding-energy fluctuations by Bohigas
and Leboeuf, and with theoretical work by Feshbach et al.


title: CGC, Hydrodynamics, and the Parton Energy Loss

abstract:
  Hadron spectra in Au+Au collisions at RHIC are calculated by hydrodynamics
with initial conditions from the Color Glass Condensate (CGC). Minijet
components with parton energy loss in medium are also taken into account by
using parton density obtained from hydrodynamical simulations. We found that
CGC provides a good initial condition for hydrodynamics in Au+Au collisions at
RHIC.


title: Resonance decay effects on anisotropy parameters

abstract:
  We present the elliptic flow $v_2$ of pions produced from resonance decays.
The transverse momentum $p_T$ spectra of the parent particles are taken from
thermal model fits and their $v_2$ are fit under the assumption that they
follow number-of-constituent-quark (NCQ) scaling expected from
quark-coalescence models. The $v_2$ of pions from resonance particle decays is
found to be similar to the measured pion $v_2$. We also propose the measurement
of electron $v_2$ as a means to extract open-charm $v_2$ and investigate
whether a thermalized system of quarks and gluons (a quark-gluon plasma) is
created in collisions of Au nuclei at RHIC.


title:
Relativistic mean field study of the newly discovered $\alpha$-decay
  chain of $^{287}$115

abstract:
  The single particle structure of the low lying levels in the nuclei belonging
to the newly observed $\alpha$-decay chain starting from $^{287}$115 has been
studied. Relativistic mean field calculation with two forces NL1 and NL3 has
been performed in the blocked BCS approximation. Q-values for possible decay
have been calculated and compared with experiment. Lifetime estimates obtained
from phenomenological relations have also been compared.


title: The QGP Discovered at RHIC

abstract:
  Three empirical lines of evidence from RHIC have converged and point to the
discovery of a strongly coupled Quark Gluon Plasma. The evidence includes (1)
bulk collective elliptic flow and (2) jet quenching and mono-jet production,
observed in Au+Au collisions at 200 AGeV, and (3) a critical control experiment
using D+Au at 200 AGeV.


title: RHIC Physics with the Parton Cascade Model

abstract:
  We present an analysis of the net-baryon number rapidity distribution and of
direct photon emission in the framework of the Parton Cascade Model.


title: Strangeness Production at RHIC in the Perturbative Regim

abstract:
  We investigate strange quark production in Au-Au collisions at RHIC in the
framework of the Parton Cascade Model(PCM). The yields of (anti-) strange
quarks for three production scenarios -- primary-primary scattering, full
scattering, and full production -- are compared to a proton-proton baseline.
Enhancement of strange quark yields in central Au-Au collisions compared to
scaled p-p collisions increases with the number of secondary interactions. The
centrality dependence of strangeness production for the three production
scenarios is studied as well. For all production mechanisms, the strangeness
yield increases with $(N_{\rm part})^{4/3}$. The perturbative QCD regime
described by the PCM is able to account for up to 50% of the observed
strangeness at RHIC.


title:
Particle correlations at RHIC from parton coalescence dynamics -- first
  results

abstract:
  A new dynamical approach that combines covariant parton transport theory with
hadronization channels via parton coalescence and fragmentation is applied to
Au+Au at RHIC. Basic consequences of the simple coalescence formulas, such as
elliptic flow scaling and enhanced proton/pion ratio, turn out to be rather
sensitive to the spacetime aspects of coalescence dynamics.


title: Recombination Models

abstract:
  We review the current status of recombination and coalescence models that
have been successfully applied to describe hadronization in heavy ion
collisions at RHIC energies. Basic concepts as well as actual implementations
of the idea are discussed. We try to evaluate where we stand in our
understanding at the moment and what remains to be done in the future.


title: Models of the Nonmesonic Weak Decay

abstract:
  I review the current status of understanding the mechanism of the nonmesonic
weak decays (NMWD) of hypernuclei. Long standing problem on the Gamma_n/Gamma_p
ratio has been solved by considering short-range weak interactions properly.
This leaves a few remaining problems, such as the asymmetry of the emitted
proton with respect to the Lambda polarization and validity of the Delta I=1/2
in the nonmesonic weak decay.


title:
Production of resonances in a thermal model: invariant-mass spectra and
  balance functions

abstract:
  We present a calculation of the pi+ pi- invariant-mass correlations and the
pion balance functions in the single-freeze-out model. A satisfactory agreement
with the data for Au+Au collisions is found.


title: The Phase Diagram of the Quark-Meson Model

abstract:
  Within the proper-time renormalization group approach, the chiral phase
diagram of a two-flavor quark-meson model is studied. In the chiral limit, the
location of the tricritical point which is linked to a Gaussian fixed point, is
determined. For quark chemical potentials smaller than the tricritical one the
second-order phase transition belongs to the O(4) universality class. For
temperatures below the tricritical one we find initially a weak first-order
phase transition which is commonly seen in model studies and also in recent
lattice simulations. In addition, below temperatures of T <~ 17 MeV we find two
phase transitions. The chiral restoration transition is initially also of
first-order but turns into a second-order transition again. This leads to the
possibility that there may be a "second tricritical" point in the QCD phase
diagram in the chiral limit.


title: Photon production from non-equilibrium QGP in heavy ion collisions

abstract:
  We present a calculation of thermal photon production i.e. photons from
secondary interactions among particles produced in heavy ion collisions at
collider energies. This is done within the framework of hydrodynamics. We take
into account the lack of chemical equilibrium in QGP. It turns out that main
effects from chemical non-equilibrium composition of QGP, reduction of particle
number and increase in temperature, nearly cancel in photon spectrum.


title: Origin of chaos in the spherical nuclear shell model: role of symmetries

abstract:
  To elucidate the mechanism by which chaos is generated in the shell model, we
compare three random-matrix ensembles: the Gaussian orthogonal ensemble,
French's two-body embedded ensemble, and the two-body random ensemble (TBRE) of
the shell model. Of these, the last two take account of the two-body nature of
the residual interaction, and only the last, of the existence of conserved
quantum numbers like spin, isospin, and parity. While the number of independent
random variables decreases drastically as we follow this sequence, the
complexity of the (fixed) matrices which support the random variables,
increases even more. In that sense we can say that in the TBRE, chaos is
largely due to the existence of (an incomplete set of) symmetries.


title: Hydrodynamic models

abstract:
  Recent developments based on relativistic hydrodynamic models in high energy
heavy ion collisions are discussed. I focus especially on how hydrodynamics
works at RHIC energies and how one can use the most of it in analyses of jet
quenching and thermal electromagnetic radiations. I also comment on improvement
of initial conditions and viscosity in hydrodynamic models.


title: Comment on Ji-Sheng Chen et al

abstract:
  This paper was withdrawn by arXiv admins because of inappropriate and
unverifiable claims of appropriation.


title: Rapidity dependent momentum anisotropy at RHIC

abstract:
  In Au+Au collisions at RHIC, elliptic flow was found to rapidly decrease as a
function of rapidity. We argue that the origin of this phenomenon is incomplete
thermalization of the initial fireball outside the midrapidity region and show
that it can be quantitatively related to the analogous effect at midrapidity in
peripheral collisions and in collisions at lower beam energies.


title: Microscopic study of collective excitations in rotating nuclei

abstract:
  We have carried out a unified microscopic study of electric monopole,
quadrupole and magnetic dipole excitations in fast rotating nuclei undergoing
backbending, with special attention at the magnetic excitations. We found,
among other results, that the strength of the orbital magnetic dipole
excitations (scissors mode) gets enhanced by more than a factor four at high
rotational frequency, above the backbending region. We provide a physical
explanation for such an enhancement.


title: Production of resonances in a thermal model

abstract:
  We discuss the pi+ pi- invariant-mass correlations and the resonance
production in a thermal model with single freeze-out. The predictions are
confronted with the data from the STAR Collaboration.


title:
Coulomb corrections for quasielastic (e,e') scattering: eikonal
  approximation

abstract:
  We address the problem of including Coulomb distortion effects in inclusive
quasielastic (e,e') reactions using the eikonal approximation. Our results
indicate that Coulomb corrections may become large for heavy nuclei for certain
kinematical regions. The issues of our model are presented in detail and the
results are compared to calculations of the Ohio group, where Dirac wave
functions were used both for electrons and nucleons. Our results are in good
agreement with those obtained by exact calculations.


title: Theory Highlights of Quark Matter 2004

abstract:
  Selected highlights of the theoretical developments reported at the 2004
Quark Matter conference are discussed, with emphasis on open issues.


title:
Effects of momentum-dependent nuclear potential on two-nucleon
  correlation functions and light cluster production in intermediate energy
  heavy-ion collisions

abstract:
  Using an isospin- and momentum-dependent transport model, we study the
effects due to the momentum dependence of isoscalar nuclear potential as well
as that of symmetry potential on two-nucleon correlation functions and light
cluster production in intermediate energy heavy-ion collisions induced by
neutron-rich nuclei. It is found that both observables are affected
significantly by the momentum dependence of nuclear potential, leading to a
reduction of their sensitivity to the stiffness of nuclear symmetry energy.
However, the t/$^{3}$He ratio remains a sensitive probe of the density
dependence of nuclear symmetry energy.


title:
A relativistic treatment of pion wave functions in the annihilation
  antiproton-proton -> pi^-pi^+

abstract:
  Quark model intrinsic wave functions of highly energetic pions in the
reaction \bar pp->\pi^-\pi^+ are subjected to a relativistic treatment. The
annihilation is described in a constituent quark model with A2 and R2
flavor-flux topology and the annihilated quark-antiquark pairs are in 3P_0 and
3S_1 states. We study the effects of pure Lorentz transformations on the
antiquark and quark spatial wave functions and their respective spinors in the
pion. The modified quark geometry of the pion has considerable impact on the
angular dependence of the annihilation mechanisms.


title: Glueball enhancements in p(gamma,VV)p through vector meson dominance

abstract:
  Double vector meson photoproduction, p(gamma, G -> VV)p, mediated by a scalar
glueball G is investigated. Using vector meson dominance (VMD) and
Regge/pomeron phenomenology, a measureable glueball enhancement is predicted in
the invariant VV = rho rho and omega omega mass spectra. The scalar glueball is
assumed to be the lightest physical state on the daughter pomeron trajectory
governing diffractive vector meson photoproduction. In addition to cross
sections, calculations for hadronic and electromagnetic glueball decays, G -> V
V' (V,V'= rho, omega, phi, gamma), and gamma_v V -> G transition form factors
are presented based upon flavor universality, VMD and phenomenological
couplings from phi photoproduction analyses. The predicted glueball decay
widths are similar to an independent theoretical study. A novel signature for
glueball detection is also discussed.


title:
Consistency of the effective-field-theory approach to the
  nucleon-nucleon interaction problem revisited

abstract:
  It is argued that Weinberg's approach to the nucleon-nucleon (NN) interaction
problem within effective field theory provides a consistent power counting for
renormalized diagrams. Within this scheme the NN potential is organized as an
expansion in terms of small quantities like small external momenta and the pion
mass (divided by the characteristic large scale of the effective theory).
Physical observables to any given order in these small quantities are
calculated from the solutions of the Lippmann-Schwinger (or Schr\" odinger)
equation.


title: Viscosity and Thermalization

abstract:
  I solve the Relativistic Navier Stokes Equations assuming boost invariance
and rotational symmetry. I compare the resulting numerical solutions for two
limiting models of the shear viscosity. In the first model the shear viscosity
is made proportional to the temperature. Thus, $\eta \propto T/\sigma_0$ where
$\sigma_0$ is some fixed cross section (perhaps $\sigma_0 \sim
\Lambda_{QCD}^{-2}$) . This viscosity model is typical of the classical
Boltzmann simulations of Gyulassy and Molnar. In the second model the shear
viscosity is made proportional to $T^3$. This model is typical of high
temperature QCD. When the initial mean free path of the $T^3$ model is four
times larger than the $T/\sigma_0$ model, the two models of viscosity produce
the same radial flow. This result can be understood with simple scaling
arguments. Thus, the large transport opacity needed in classical Boltzmann
simulations is in part an artifact of the fixed scale $\sigma_0$ in these
models.


title: The electromagnetic signature of jets

abstract:
  Recent RHIC data have suggested an interesting scenario where jets, after
being formed in the very first instants of the nuclear collision, interact
strongly and are absorbed by the hot and dense matter subsequently created. In
this respect, electromagnetic signals constitute another class of penetrating
radiation. We first propose the study of large mass dileptons induced by the
passage of high-energy quark jets through quark-gluon plasma. We find that the
yield due to the jet-plasma interaction gets progressively larger as the
collision energy increases: it is slightly less than the Drell-Yan contribution
at RHIC energies, and it is a factor of 10 larger than Drell-Yan at the LHC. In
a related investigation, we then propose to study dilepton-tagged jets. We
estimate quantitatively the various background sources, and identify windows
where those are sub-dominant.


title: Extended Pairing Model for Heavy Nuclei

abstract:
  We study binding energies in three isotopic chains ($^{100-130}$Sn,
$^{152-181}$Yb, and $^{181-202}$Pb) using the extended pairing model with
Nilsson single-particle energies. The exactly solvable nature of the model
means that the pairing strength G(A) required to reproduce the experimental
binding energies can be determined uniquely. The valence space consists of the
neutron single-particle levels between two closed shells corresponding to the
magic numbers 50-82 and 82-126. In all three isotopic chains, log(G(A)) has a
smooth quadratic behavior for even as well as odd nucleon numbers A; log(G(A))
for even and odd A are very similar. Remarkably, G(A) for all the Pb isotopes
can be also described by a two parameter expression that is inversely
proportional to the dimensionality of the model space.


title: Charged polytropic compact stars

abstract:
  In this work, we analyze the effect of charge in compact stars considering
the limit of the maximum amount of charge they can hold. We find that the
global balance of the forces allows a huge charge (~ 10^{20} Coulomb) to be
present in a neutron star producing a very high electric field (~ 10^{21} V/m).
We have studied the particular case of a polytropic equation of state and
assumed that the charge distribution is proportional to the mass density. The
charged stars have large mass and radius as we should expect due to the effect
of the repulsive Coulomb force with the M/R ratio increasing with charge. In
the limit of the maximum charge the mass goes up to ~ 10 M_sun which is much
higher than the maximum mass allowed for a neutral compact star. However, the
local effect of the forces experienced by a single charged particle, makes it
to discharge quickly. This creates a global force imbalance and the system
collapses to a charged black hole.


title: Nuclear incompressibility in the quasilocal density functional theory

abstract:
  We explore the ability of the recently established quasilocal density
functional theory for describing the isoscalar giant monopole resonance. Within
this theory we use the scaling approach and perform constrained calculations
for obtaining the cubic and inverse energy weighted moments (sum rules) of the
RPA strength. The meaning of the sum rule approach in this case is discussed.
Numerical calculations are carried out using Gogny forces and an excellent
agreement is found with HF + RPA results previously reported in literature. The
nuclear matter compression modulus predicted in our model lies in the range
210-230 MeV which agrees with earlier findings. The information provided by the
sum rule approach in the case of nuclei near the neutron drip line is also
discussed.


title:
A microscopic study of the proton-neutron symmetry and phonon structure
  of the low-lying states in 92Zr

abstract:
  We studied in a microscopic multiphonon approach the proton-neutron symmetry
and phonon structure of some low-lying states recently discovered in 92Zr. We
confirm the breaking of F-spin symmetry, but argue that the breaking mechanism
is more complex than the one suggested in the original shell model analysis of
the data. We found other new intriguing features of the spectrum, like a
pronounced multiphonon fragmentation of the states and a tentative evidence of
a three-phonon mixed symmetry state.


title:
Spin polarized states in nuclear matter with Skyrme effective
  interaction

abstract:
  The possibility of appearance of spin polarized states in symmetric and
strongly asymmetric nuclear matter is analyzed within the framework of a Fermi
liquid theory with the Skyrme effective interaction. The zero temperature
dependence of the neutron and proton spin polarization parameters as functions
of density is found for SkM$^*$, SGII (symmetric case) and SLy4, SLy5 (strongly
asymmetric case) effective forces. By comparing free energy densities, it is
shown that in symmetric nuclear matter ferromagnetic spin state (parallel
orientation of neutron and proton spins) is more preferable than
antiferromagnetic one (antiparallel orientation of spins). Strongly asymmetric
nuclear matter undergoes at some critical density a phase transition to the
state with the oppositely directed spins of neutrons and protons while the
state with the same direction of spins does not appear. In comparison with
neutron matter, even small admixture of protons strongly decreases the
threshold density of spin instability. It is clarified that protons become
totally polarized within a very narrow density domain while the density profile
of the neutron spin polarization parameter is characterized by the appearance
of long tails near the transition density.


title:
Properties and evolution of a protoneutron star in the enlarged SU(3)
  model

abstract:
  Protoneutron stars are hot and lepton rich objects formed as a result of type
II supernovae explosion. This paper describes results of analysis of
protoneutron star models constructed under the assumptions that strange
particles are present in the core. All calculations have been performed for the
neutrino opaque matter when the entropy per baryon is of the order 2. The
equation of state which is crucial for the structure and composition of a star
has been obtained in the framework of the chiral SU(3) model and compared with
the one involving derivative coupling of baryons to mesons. Of special interest
in this paper is the comparison of the two protoneutron star models with those
formed when neutrinos leak out of the system, described as cool, deleptonized
neutron stars. It has been shown that the maximum mass of the hot protoneutron
star with trapped neutrinos is close to 1.9 M (the Sun Mass) in case of the
SU(3) model. However, deleptonization reduces the value of stable protoneutron
star mass significantly to 1.5 M.


title:
Components of an algebraic solution of the multichannel problem of
  low-energy n-${}^{12}$C scattering plus sub-threshold (${}^{13}$C) states

abstract:
  The effects of components in an assumed model interaction potential, as well
as of the order to which its deformation is taken, upon resonances in the
low-energy cross sections and upon sub-threshold bound states of the compound
nucleus (${}^{13}$C) are discussed.


title: Chaos driven fusion enhancement factor at astrophysical energies

abstract:
  We perform molecular dynamics simulations to assess the screening effects by
bound target electrons in low energy nuclear reactions in laboratories. Quantum
effects corresponding to the Pauli and Heisenberg principle are enforced by
constraints. We show that the enhancement of the average cross section and of
its variance is due to the perturbations induced by the electrons.This gives a
correlation between the maximum amplitudes of the inter-nuclear oscillational
motion and the enhancement factor. It suggests that the chaotic behavior of the
electronic motion affects the magnitude of the enhancement factor.


title: Low densities in nuclear and neutron matters and in the nuclear surface

abstract:
  Nuclear and neutron matters are investigated in the low density region, well
below the nuclear saturation density. Microscopic calculations, based on the
Bethe-Brueckner approach with a few realistic nucleon-nucleon potentials, are
compared with the predictions of a set of phenomenological effective
interactions, mostly employed in nuclear structure studies. An energy
functional is constructed on the basis of the microscopic bulk EoS and applied
to a selection of nuclei throughout the mass table. The results provide a
microscopic basis for a link between nuclear surface behaviour and neutron EoS
previously observed with phenomenological effective forces. Possible effects of
pairing on asymmetric nuclear matter are also analyzed in detail. The results
are expected to illuminate the physical mechanisms which determine the
behaviour of the surface density tail in exotic nuclei.


title:
Spin-5/2 resonance contributions to the pion-induced reactions for
  energies $\sqrt{s}\leqslant$2.0 GeV

abstract:
  The spin-$\ffh$ resonance effects are studied within the coupled channel
effective Lagrangian model for baryon resonance analysis. We extend our
previous hadronic calculations to incorporate the $D_{15}$, $F_{15}$, $D_{35}$,
$F_{35}$ states.
  While the effect of the spin-$\ffh$ resonances to the $\eta N$, $K \Lambda$,
and $K \Sigma$ reactions are small, the contribution to the $\omega N$ is found
to be important. The results for the 'conventional' and Pascalutsa-like
spin-$\ffh$ descriptions are discussed.
\PACS{{11.80.-m},{13.75.Gx},{14.20.Gk},{13.30.Gk}}


title: Chiral symmetry, strangeness and resonances

abstract:
  We review the important role played by the chiral SU(3) symmetry in
predicting the properties of antikaons and hyperon resonances in cold nuclear
matter. Objects of crucial importance are the meson-baryon scattering
amplitudes obtained within the chiral coupled-channel effective field theory.
The formation of baryon resonances as implied by chiral coupled-channel
dynamics is discussed. Results for antikaon and hyperon-resonance spectral
functions are presented for isospin symmetric and asymmetric matter.


title: Static response of Fermi liquids with tensor interactions

abstract:
  We use Landau's theory of a normal Fermi liquid to derive expressions for the
static response of a system with a general tensor interaction that conserves
the total spin and the total angular momentum of the quasiparticle-quasihole
pair. The magnetic susceptibility is calculated in detail, with the inclusion
of the center of mass tensor and cross vector terms in addition to the exchange
tensor one. We also introduce a new parametrization of the tensor Landau
parameters which significantly reduces the importance of high angular harmonic
contributions. For nuclear matter and neutron matter we find that the two most
important effects of the tensor interaction are to give a contribution from
multipair states and to renormalize the magnetic moments. Response to a weak
probe may be calculated using similar methods, replacing the magnetic moments
with the matrix elements of the weak charges.


title:
The $\phi$ meson width in the medium from proton induced $\phi$
  production in nuclei

abstract:
  We perform calculations for the production of $\phi$ mesons in nuclei at
energies just above threshold and study the $A$ dependence of the cross
section. We use results for the $\phi$ selfenergy in the medium obtained within
a chiral unitary approach. We find a strong $A$ dependence which is tied to the
distortion of the incident proton and to the absorption of the $\phi$ in its
way out of the nucleus. The effect of this latter process reduces the cross
section in about a factor two in heavy nuclei proving that the $A$ dependence
of the cross section bears valuable information on the $\phi$ width in the
nuclear medium. Calculations are done for energies which are accessible in an
experimental facility like COSY.


title:
Peculiar properties of the cluster-cluster interaction induced by the
  Pauli exclusion principle

abstract:
  Role of the Pauli principle in the formation of both the discrete spectrum
and multi-channel states of the binary nuclear systems composed of clusters is
studied in the Algebraic Version of the resonating-group method. Solutions of
the Hill-Wheeler equations in the discrete representation of a complete basis
of the Pauli-allowed states are discussed for 4He+n, 3H+3H, and 4He+4He binary
systems. An exact treatment of the antisymmetrization effects are shown to
result in either an effective repulsion of the clusters, or their effective
attraction. It also yields a change in the intensity of the centrifugal
potential. Both factors significantly affect the scattering phase behavior.
Special attention is paid to the multi-channel cluster structure 6He+6He as
well as to the difficulties arising in the case when the two clustering
configurations, 6He+6He and 4He+8He, are taken into account simultaneously. In
the latter case the Pauli principle, even in the absence of a potential energy
of the cluster-cluster interaction, leads to the inelastic processes and
secures an existence of both the bound state and resonance in the 12Be compound
nucleus.


title:
Auxiliary Field Diffusion Monte Carlo calculation of ground state
  properties of neutron drops

abstract:
  The Auxiliary Field Diffusion Monte Carlo method has been applied to simulate
droplets of 7 and 8 neutrons. Results for realistic nucleon-nucleon
interactions, which include tensor, spin--orbit and three--body forces, plus a
standard one--body confining potential, have been compared with analogous
calculations obtained with Green's Function Monte Carlo methods. We have
studied the dependence of the binding energy, the one--body density and the
spin--orbit splittings of $^7n$ on the depth of the confining potential. The
results obtained show an overall agreement between the two quantum Monte Carlo
methods, although there persist differences in the evaluation of spin--orbit
forces, as previously indicated by bulk neutron matter calculations. Energy
density functional models, largely used in astrophysical applications, seem to
provide results significantly different from those of quantum simulations.
Given its scaling behavior in the number of nucleons, the Auxiliary Field
Diffusion Monte Carlo method seems to be one of the best candidate to perform
{\sl ab initio} calculations on neutron rich nuclei.


title: A Semiclassical Approach to Fusion Reactions

abstract:
  The semiclassical method of Alder and Winther is generalized to study fusion
reactions. As an illustration, we evaluate the fusion cross section in a
schematic two-channel calculation. The results are shown to be in good
agreement with those obtained with a quantal Coupled-Channels calculation. We
suggest that in the case of coupling to continuum states this approach may
provide a simpler alternative to the Continuum Discretized Coupled-Channels
method.


title:
Relativistic effects and angular dependence in the reaction
  antiproton-proton -> pi^- pi^+

abstract:
  We present a new fit to the LEAR data on antiproton-proton -> pi^- pi^+
differential cross sections and analyzing powers motivated by relativistic
considerations. Within a quark model describing this annihilation we argue,
since the pions are highly energetic, that relativistic effects cannot be
neglected. The intrinsic pion wave functions are Lorentz transformed to the
center of mass frame. This change in quark geometry gives rise to additional
angular dependence in the transition operators and results in a relative
enhancement of higher J \ge 2 partial wave amplitudes. The fit to the data is
improved significantly.


title: Fragmentation or Recombination at High p_T?

abstract:
  All hadronization processes, including fragmentation, are shown to proceed
through recombination. The shower partons in a jet turn out to play an
important role in describing the p_T spectra of hadrons produced in heavy-ion
collisions. Due to the recombination of the shower partons with the soft
thermal partons, the structure of jets produced in AA collisions is not the
same as that of jets produced in pp collisions.


title: Nuclear collective processes study with attosecond laser pulses

abstract:
  In this paper the possibility of the excitation of collective nuclear motion
with attosecond laser pulses is investigated. Following our earlier results
(Lasers in Engineering 11 (2001) p. 259) the hyperbolic heat transport for
nuclear matter is formulated and solved. It is shown that in the vicinity of
the 30 MeV excitation energy the recollided electrons can excite the giant
collective motions - thermal wave inside the nuclei.
  Key words: Attosecond laser pulses; Electronuclear reactions; Thermal waves;
Giant Resonances.


title:
Indication of quark deconfinement and evidence for a Hubble flow in 130
  and 200 GeV Au+Au collisions

abstract:
  Buda-Lund hydro model fits are compared to BRAHMS, PHENIX, PHOBOS and STAR
data on identified particle spectra, two-particle Bose-Einstein or HBT
correlations, charged particle pseudorapidity distributions and pseudorapidity
as well as p_t dependent elliptic flow in sqrt(s_NN) = 130 and 200 GeV Au+Au
collisions at RHIC. Preliminary results indicate that 7/8-th of the particle
emitting volume is rather cold, with surface temperature of 105 MeV, but the
temperature has a distribution and the most central 1/8-th of the volume is
superheated to temperatures above the critical value, T(x) > T_c = 172 \pm 3
MeV.


title:
Improved effective momentum approximation for quasielastic (e,e')
  scattering off highly charged nuclei

abstract:
  We address the problem of including Coulomb distortion effects in inclusive
quasielastic (e,e') reactions using an improved version of the effective
momentum approximation. Arguments are given that a simple modification of the
effective momentum approximation, which is no longer applicable in its original
form in the case of highly charged nuclei, leads to very good results. A
comparison of the improved effective momentum method with exact calculations is
given. A critical remark concerns recent experiments with inclusive
quasielastic positron scattering.


title: Collective modes in strange and isospin asymmetric hadronic matter

abstract:
  We study the propagation of non-strange and strange meson modes in hadronic
matter considering both isospin and strangeness mixings induced by quantum
fluctuations in the medium. Baryons are described using the Quark Meson
Coupling model extended to include interactions of strange quarks. In
particular we evaluate the dependence of the meson masses on the baryonic
density, the strangeness fraction and the isospin asymmetry of the medium. We
have found a considerable admixture of strangeness and isospin in the
sigma-mode in the high density regime.


title: The Color Glass Condensate at RHIC

abstract:
  The Color Glass Condensate formalism and its application to high energy heavy
ion collisions at RHIC are discussed. We argue that the RHIC data supports the
view that the Color Glass Condensate provides the initial conditions for
gold-gold collisions at RHIC while final state (Quark Gluon Plasma) effects are
responsible for the high $p_t$ suppression in mid rapidity. At forward
rapidities in deuteron-gold collisions, however, Color Glass Condensate is the
underlying physics of the observed suppression of the particle spectra and
their centrality dependence.


title: Pion entropy and phase-space densities in A+A collisions

abstract:
  We propose a method to estimate the entropy of thermal pions in A+A
collisions irrespective of unknown form of freeze-out (isothermal) hypersurface
and transverse flows developed. We analyse the average phase-space densities
and entropies of the thermal pions vs their multiplicities and collision
energies. The behaviour of these values apparently indicates the deconfinement
and chiral phase transitions in relativistic nuclear-nucleus collisions


title:
Sudden freeze-out vs continuous emission: duality in hydro-kinetic
  approach to A+A collisions

abstract:
  The problem of spectra formation in hydrodynamic approach to A+A collisions
is discussed. It is analyzed in terms of the two different objects:
distribution and emission functions. We show that though the process of
particle liberation, described by the emission function, is, usually,
continuous in time, the observable spectra can be also expressed by means of
the Landau/Cooper-Frye prescription. We argue that such an approximate duality
results from some symmetry properties that systems in A+A collisions reach to
the end of hydrodynamic evolution and reduction of the collision rate at post
hydrodynamic stage


title: The N=28 shell closure; from N=Z to the neutron drip line

abstract:
  The evolution of the N=28 neutron shell closure is studied in the N=28
isotones from neutron drip line's $^{40}$Mg to N=Z doubly magic $^{56}$Ni. It
is found that the N=28 closure vanishes at Z=12 in favor of a deformed ground
state. For Z=14 and Z=16 closed shell and intruder configurations are almost
degenerate, leading to highly mixed ground states and to very low lying excited
0$^+$ states. For Z$>$20 the intruder states are always above the closed shell
ground states. We examine their structure and their possible existence as
collective yrare bands of well defined particle-hole character.


title:
Ground-gamma band mixing and evolution of collectivity in even-even
  neutron-rich nuclei with 40<Z<50

abstract:
  We propose an extended band mixing formalism capable of describing the
ground-gamma band interaction in a wide range of collective spectra beyond the
regions of well deformed nuclei. On this basis we explain the staggering
effects observed in the gamma bands of Mo, Ru and Pd nuclei providing a
consistent interpretation of new experimental data in the neutron rich region.
As a result the systematic behavior of the odd-even staggering effect and some
general characteristics of the spectrum such as the mutual disposition of the
bands, the interaction strength and the band structures is explained as the
manifestation of respective changes in collective dynamics of the system.