title: Double-$\Lambda$ hypernuclei in the relativistic mean-field theory

abstract:
  We study the properties of double-$\Lambda$ hypernuclei in the relativistic
mean-field theory, which has been successfully used for the description of
stable and unstable nuclei. With the meson-hyperon couplings determined by the
experimental binding energies of single-$\Lambda$ hypernuclei, we present a
self-consistent calculation of double-$\Lambda$ hypernuclei in the relativistic
mean-field theory, and discuss the influence of hyperons on the nuclear core.
The contribution of two mesons with dominant strange quark components (scalar
$\sigma^*$ and vector $\phi$) to the $\Lambda\Lambda$ binding energy of
double-$\Lambda$ hypernuclei is examined.


title: Strangeness Chemical Equilibration in QGP at RHIC and LHC

abstract:
  We study, in the dynamically evolving QGP fireball formed in relativistic
heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward
and beyond the chemical equilibrium. We account for the contribution of the
direct strangeness production and evaluate the thermal-QCD strangeness
production mechanisms. The specific yield of strangeness per entropy, s/S, is
the primary target variable. We explore the effect of collision impact
parameter, i.e., fireball size, on kinetic strangeness chemical equilibration
in QGP. Insights gained in study the RHIC data with regard to the dynamics of
the fireball are applied to the study strangeness production at the LHC. We use
these results and consider the strange hadron relative particle yields at RHIC
and LHC in a systematic fashion. We consider both the dependence on s/S and
directly participant number dependence.


title: MOMDIS: a Glauber model computer code for knockout reactions

abstract:
  A computer program is described to calculate momentum distributions in
stripping and diffraction dissociation reactions. A Glauber model is used with
the scattering wavefunctions calculated in the eikonal approximation. The
program is appropriate for knockout reactions at intermediate energy collisions
(30 MeV $\leq$ E$_{lab}/$nucleon $\leq 2000$ MeV). It is particularly useful
for reactions involving unstable nuclear beams, or exotic nuclei (e.g.
neutron-rich nuclei), and studies of single-particle occupancy probabilities
(spectroscopic factors) and other related physical observables. Such studies
are an essential part of the scientific program of radioactive beam facilities,
as in for instance the proposed RIA (Rare Isotope Accelerator) facility in the
US.


title: Charge density of light exotic nuclei and $\rho NN$ tensor coupling

abstract:
  We use a relativistic mean field model to study the charge density
distributions of exotic oxygen isotopes. Nonlinear isoscalar-isovector terms
which are not constrained by the present data are considered and the $\rho NN$
tensor coupling that does not affect the symmetry energy in the mean field
model is included. Strong correlations between the neutron radius of $^{208}$Pb
and the charge radius of $^{12,13,23,24}$O are found. The $\rho NN$ tensor
coupling explicitly enhances the radius correlations between $^{23,24}$O and
$^{208}$Pb. This enhancement is due to the neutron occupation of the orbital
$2s_{1/2}$. The charge radius is sensitive to the change of the density
dependence of the symmetry energy as the isotope goes towards the proton drip
line.


title: Density functional theory for fermions close to the unitary regime

abstract:
  We consider interacting Fermi systems close to the unitary regime and compute
the corrections to the energy density that are due to a large scattering length
and a small effective range. Our approach exploits the universality of the
density functional and determines the corrections from the analyical results
for the harmonically trapped two-body system. The corrections due to the finite
scattering length compare well with the result of Monte Carlo simulations. We
also apply our results to symmetric neutron matter.


title:
Nuclear Schiff moment in nuclei with soft octupole and quadrupole
  vibrations

abstract:
  Nuclear forces violating parity and time reversal invariance (${\cal P},{\cal
T}$-odd) produce ${\cal P},{\cal T}$-odd nuclear moments, for example, the
nuclear Schiff moment. In turn, this moment can induce the electric dipole
moment in the atom. The nuclear Schiff moment is predicted to be enhanced in
nuclei with static quadrupole and octupole deformation. The analogous
suggestion of the enhanced contribution to the Schiff moment from the soft
collective quadrupole and octupole vibrations in spherical nuclei is tested in
this article in the framework of the quasiparticle random phase approximation
with separable quadrupole and octupole forces applied to the odd $^{217-221}$Ra
and $^{217-221}$Rn isotopes. We confirm the existence of the enhancement effect
due to the soft modes. However, in the standard approximation the enhancement
is strongly reduced by a small weight of the corresponding "particle + phonon"
component in a complicated wave function of a soft nucleus. The perspectives of
a better description of the structure of heavy soft nuclei are discussed.


title: Testing Deconfinement at High Isospin Density

abstract:
  We study the transition from hadronic matter to a mixed phase of quarks and
hadrons at high baryon and isospin densities reached in heavy ion collisions.
We focus our attention on the role played by the nucleon symmetry energy at
high density.In this respect the inclusion of a scalar isovector meson, the
\delta-coupling, in the Hadron Lagrangian appears rather important. We study in
detail the formation of a drop of quark matter in the mixed phase, and we
discuss the effects on the quark drop nucleation probability of the finite size
and finite time duration of the high density region. We find that, if the
parameters of quark models are fixed so that the existence of quark stars is
allowed, then the density at which a mixed phase starts forming drops
dramatically in the range Z/A \sim 0.3--0.4. This opens the possibility to
verify the Witten-Bodmer hypothesis on absolute stability of quark matter using
ground-based experiments in which neutron-rich nuclei are employed. These
experiments can also provide rather stringent constraints on the Equation of
State (EoS) to be used for describing the pre-Supernova gravitational collapse.
Consistent simulations of neutron rich heavy ion collisions are performed in
order to show that even at relatively low energies, in the few AGeV range, the
system can enter such unstable mixed phase. Some precursor observables are
suggested, in particular a ``neutron trapping'' effect.


title:
Superscaling and neutral current quasielastic neutrino-nucleus
  scattering

abstract:
  The superscaling approach is applied to studies of neutral current neutrino
reactions in the quasielastic regime. Using input from scaling analyses of
electron scattering data, predictions for high-energy neutrino and antineutrino
cross sections are given and compared with results obtained using the
relativistic Fermi gas model. The influence of strangeness content inside the
nucleons in the nucleus is also explored.


title: Omega attenuation in nuclei

abstract:
  We study inclusive omega photoproduction in nuclei and propose a measurement
of the nuclear transparency ratio as a means to learn about the in-medium
properties of the omega meson. To this end we are using the semi-classical
coupled-channel BUU transport approach that allows for a consistent treatment
of all nuclear effects. The conditions of our calculations are chosen such as
to match the setup of existing experimental facilities at ELSA or MAMI C. We
show that the observables (total production cross section and transparency)
indeed are sensitive to the omega N interaction in the nuclear medium.


title:
Clues to the nature of the Delta^*(1700) resonance from pion- and
  photon-induced reactions

abstract:
  We make a study of the (pi^- p --> K^0 pi^0 Lambda), (pi^+ p --> K^+ pi^+
Lambda), (K^+\bar{K}^0 p), (K^+ pi^+ Sigma^0), (K^+ pi^0 Sigma^+), and (eta
pi^+ p) reactions, in which the basic dynamics is given by the excitation of
the Delta^*(1700) resonance which subsequently decays into (K Sigma^*(1385)) or
(Delta(1232) eta). In a similar way we also study the (gamma p --> K^0 pi^+
Lambda), (K^+ pi^- Sigma^+), (K^+ pi^+ Sigma^-), (K^0 pi^0 Sigma^+), and (eta
pi^0 p) related reactions. The cross sections are proportional to the square of
the coupling of Delta^*(1700) to (Sigma^*K), (Delta eta) for which there is no
experimental information but which is provided in the context of coupled
channels chiral unitary theory where the Delta^*(1700) is dynamically
generated. Within present theoretical and experimental uncertainties one can
claim a global qualitative agreement between theory and experiment. We provide
a list of items which need to be improved in order to make further progress
along these lines.


title:
The one-body and two-body density matrices of finite nuclei with an
  appropriate treatment of the center-of-mass motion

abstract:
  The one-body and two-body density matrices in coordinate space and their
Fourier transforms in momentum space are studied for a nucleus (a
nonrelativistic, self-bound finite system). Unlike the usual procedure,
suitable for infinite or externally bound systems, they are determined as
expectation values of appropriate intrinsic operators, dependent on the
relative coordinates and momenta (Jacobi variables) and acting on intrinsic
wavefunctions of nuclear states. Thus, translational invariance (TI) is
respected. When handling such intrinsic quantities, we use an algebraic
technique based upon the Cartesian representation, in which the coordinate and
momentum operators are linear combinations of the creation and annihilation
operators a^+ and a for oscillator quanta. Each of the relevant multiplicative
operators can then be reduced to the form: one exponential of the set {a^+}
times other exponential of the set {a}. In the course of such a normal-ordering
procedure we offer a fresh look at the appearance of "Tassie-Barker" factors,
and point out other model-independent results. The intrinsic wavefunction of
the nucleus in its ground state is constructed from a
nontranslationally-invariant (nTI) one via existing projection techniques. As
an illustration, the one-body and two-body momentum distributions (MDs) for the
4He nucleus are calculated with the Slater determinant of the
harmonic-oscillator model as the trial, nTI wavefunction. We find that the TI
introduces important effects in the MDs.


title: Statistical analysis of a dynamical multifragmentation path

abstract:
  A microcanonical multifragmentation model (MMM) is used for investigating
whether equilibration really occurs in the dynamical evolution of two heavy ion
collisions simulated via a stochastic mean field approach (SMF). The standard
deviation function between the dynamically obtained freeze-out fragment
distributions corresponding to the reaction $^{129}$Xe+$^{119}$Sn at 32 MeV/u
and the MMM ones corresponding to a wide range of mass, excitation energy,
freeze-out volume and nuclear level density cut-off parameter shows a unique
minimum. A distinct statistically equilibrated stage is identified in the
dynamical evolution of the system.


title: Two models with rescattering for high energy heavy ion collisions

abstract:
  The effects of hadronic rescattering in RHIC-energy Au+Au collisions are
studied using two very different models to describe the early stages of the
collision. One model is based on a hadronic thermal picture and the other on a
superposition of parton-parton collisions. Operationally, the output hadrons
from each of these models are used as input to a hadronic rescattering
calculation. The results of the rescattering calculations from each model are
then compared with rapidity and transverse momentum distributions from the RHIC
BRAHMS experiment. It is found that in spite of the different points of view of
the two models of the initial stage, after rescattering the observed
differences between the models are mostly "washed out" and both models give
observables that agree reasonably well with each other and experiment.


title: Short range correlations in relativistic nuclear matter models

abstract:
  Short range correlations are introduced using unitary correlation method in a
relativistic approach to the equation of state of the infinite nuclear matter
in the framework of the Hartree-Fock approximation. It is shown that the
correlations give rise to an extra node in the ground-state wave-function in
the nucleons, contrary to what happens in non-relativistic calculations with a
hard core. The effect of the correlations in the ground state properties of the
nuclear matter and neutron matter is studied. The nucleon effective mass and
equation of state (EOS) are very sensitive to short range correlations. In
particular, if the pion contact term is neglected a softening of the EOS is
predicted. Correlations have also an important effect on the neutron matter EOS
which presents no binding but only a very shallow minimum contrary to the
Walecka model.


title: Convergence of the Born Series with Low-Momentum Interactions

abstract:
  The nonperturbative nature of nucleon-nucleon interactions as a function of a
momentum cutoff is studied using Weinberg eigenvalues as a diagnostic. This
investigation extends an earlier study of the perturbative convergence of the
Born series to partial waves beyond the 3S1-3D1 channel and to positive
energies. As the cutoff is lowered using renormalization-group or model-space
techniques, the evolution of nonperturbative features at large cutoffs from
strong short-range repulsion and the iterated tensor interaction are monitored
via the complex Weinberg eigenvalues. When all eigenvalues lie within the unit
circle, the expansion of the scattering amplitude in terms of the interaction
is perturbative, with the magnitude of the largest eigenvalue setting the rate
of convergence. Major decreases in the magnitudes of repulsive eigenvalues are
observed as the Argonne v18, CD-Bonn or Nijmegen potentials are evolved to low
momentum, even though two-body observables are unchanged. For chiral EFT
potentials, running the cutoff lower tames the impact of the tensor force and
of new nonperturbative features entering at N3LO. The efficacy of separable
approximations to nuclear interactions derived from the Weinberg analysis is
studied as a function of cutoff, and the connection to inverse scattering is
demonstrated.


title: Anomalous diffusion and anisotropic nonlinear Fokker-Planck equation

abstract:
  We analyse a bidimensional nonlinear Fokker-Planck equation by considering an
anisotropic case, whose diffusion coefficients are $D_x \propto |x|^{-\theta}$
and $D_y \propto |y|^{-\gamma}$ with $\theta, \gamma \in {\cal{R}}$. In this
context, we also investigate two situations with the drift force
$\vec{F}(\vec{r},t)=(-k_{x}x, -k_y y)$. The first one is characterized by
$k_x/k_y=(2+\gamma)/(2+\theta)$ and the second is given by $k_{x}=k$ and
$k_{y}=0$. In these cases, we can verify an anomalous behavior induced in
different directions by the drift force applied. The found results are exact
and exhibit, in terms of the $q$-exponentials, functions which emerge from the
Tsallis formalism. The generalization for the $D$-dimensional case is
discussed.


title:
A scalar two-level boson model to study the IBM phase diagram in the
  Casten triangle

abstract:
  We introduce a simple two-level boson model with the same energy surface as
the Q-consistent Interacting Boson Model Hamiltonian. The model can be
diagonalized for large number of bosons and the results used to check
analytical finite-size corrections to the energy gap and the order parameter in
the critical region. \


title: A Mass Formula from Light to Hypernuclei

abstract:
  Simultaneous description of ordinary and hypernuclei masses by a single mass
formula has been a great challenge in nuclear physics. Hyperon-separation
energies of about forty Lambda($\Lambda$), three
Lambda-Lambda($\Lambda\Lambda$), one Sigma($\Sigma$) and seven Cascade($\Xi$)
hypernuclei have been experimentally found. Many of these nuclei are of light
masses. We prescribe a new mass formula, called BWMH, which describes the
normal and hypernuclei on the same footing. It is based on the
modified-Bethe-Weizs\"acker mass formula (BWM). BWM is basically an extension
of the Bethe-Weizs\"acker mass formula (BW) for light nuclei. The parameters of
BWM were optimized by fitting about 3000 normal nuclei available recently. The
original Bethe-Weizs\"acker mass formula (BW) was designed for medium and heavy
mass nuclei and it fails for light nuclei. Two earlier works on hypernuclei
based on this BW show some limitations. The BWMH gives improved agreement with
the experimental data for the line of stability, one-neutron separation energy
versus neutron number spectra of normal nuclei, and the hyperon-separation
energies from hypernuclei. The drip lines are modified for addition of a
$\Lambda$ hyperon in a normal nucleus.


title: Hindrance of heavy-ion fusion due to nuclear incompressibility

abstract:
  We propose a new mechanism to explain the unexpected steep falloff of fusion
cross sections at energies far below the Coulomb barrier. The saturation
properties of nuclear matter are causing a hindrance to large overlap of the
reacting nuclei and consequently a sensitive change of the nuclear potential
inside the barrier. We report in this letter a good agreement with the data of
coupled-channels calculation for the {64}Ni+{64}Ni combination using the
double-folding potential with M3Y-Reid effective N-N forces supplemented with a
repulsive core that reproduces the nuclear incompressibility for total overlap.


title:
Ground state energy of unitary fermion gas with the Thomson Problem
  approach

abstract:
  The dimensionless universal coefficient $\xi$ defines the ratio of the
unitary fermions energy density to that for the ideal non-interacting ones in
the non-relativistic limit with T=0. The classical Thomson Problem is taken as
a nonperturbative quantum many-body arm to address the ground state energy
including the low energy nonlinear quantum fluctuation/correlation effects.
With the relativistic Dirac continuum field theory formalism, the concise
expression for the energy density functional of the strongly interacting limit
fermions at both finite temperature and density is obtained. Analytically, the
universal factor is calculated to be $\xi={4/9}$. The energy gap is
$\Delta=\frac{{5}{18}{k_f^2}/(2m)$.

categories: nucl-th astro-ph cond-mat.stat-mech cond-mat.str-el hep-ph physics.atom-ph quant-ph


title:
Single and double coincidence nucleon spectra in the weak decay of
  Lambda hypernuclei

abstract:
  Recent progress has been experienced in the field of hypernuclear weak decay,
especially concerning the ratio of the neutron- to proton-induced Lambda
non-mesonic decay rates, G_n/G_p. Theoretical analyses of nucleon coincidence
data have been performed in a finite nucleus framework. They led to the
extraction of G_n/G_p values in agreement with pure theoretical estimates, thus
providing an evidence for the solution of a longstanding puzzle. Here we
present an alternative approach to the problem, based on a nuclear matter
formalism extended to finite nuclei via the local density approximation. The
work is motivated by the exigence to make the determination of G_n/G_p from
data less model dependent. One-meson-exchange potentials are used for
describing both the one- and two-nucleon induced decays, Lambda N -> n N and
Lambda N N -> n N N. For the latter, treated within a microscopic approach, the
channels Lambda n n -> n n n and Lambda p p -> n p p are included in addition
to the mode Lambda n p -> n n p already considered, in a phenomenological way,
in previous studies. The propagation of the final nucleons in the residual
nucleus is simulated by an intranuclear cascade code. We evaluate single and
double coincidence nucleon spectra for the non-mesonic decay of C-12-Lambda.
Through the comparison of our predictions with KEK coincidence data we
determine G_n/G_p=0.43 \pm 0.10 for this hypernucleus, confirming previous
finite nucleus analyses.


title: The CFL phase and m_s: An effective field theory approach

abstract:
  We study the phase diagram of dense quark matter with an emphasis on the role
of the strange quark mass. Our approach is based on two effective field
theories (EFTs). The first is an EFT that describes quark quasi-particles near
the Fermi surface. This EFT is valid at energies small compared to the chemical
potential. The second is an EFT for the Goldstone modes in the paired phase. We
find that in response to a non-zero strange quark mass the CFL phase first
undergoes a transition to a kaon condensed phase, and then to a gapless phase
with a non-zero Goldstone boson current.


title:
Effects of Multiple Scattering in Cold Nuclear Matter on J/psi
  Suppression and <p_T^2> in Heavy Ion Collisions

abstract:
  Coherent multiple scatterings of c and cbar quark pairs in the environment of
heavy ion collisions have been used in a previous work by Qiu et al.
[Qiu:1998rz] to study J/psi suppression. That model suggests that heavy quark
re-scatterings in a cold nuclear medium can completely explain the centrality
dependence of the observed J/psi suppression in Pb+Pb collisions at the SPS
[Abreu:2001kd]. Their calculations also revealed significant differences under
the assumptions of a color singlet or color octet production mechanism. A more
recent analytic calculation [Fujii:2003fq], which includes incoherent
final-state re-scatterings with explicit momentum transfer fluctuations in
three dimensions, indicates much less suppression and little sensitivity to the
production mechanism. In this article, we study simultaneously both the J/psi
suppression and p_T modifications, at SPS and RHIC energies. We mainly focus on
incoherent momentum transfer fluctuations in two dimensions, which is more
appropriate for the heavy-ion collision kinematics. Our analytic and
Monte-Carlo calculations reinforce the analytic results in [Fujii:2003fq].
Additionally, we find that the experimental J/psi suppression and <p_T^2> from
nucleus-nucleus collisions at the SPS or RHIC cannot simultaneously be
described in this incoherent multiple scattering framework for any value of the
fluctuation strength parameter <k_T^2>.


title: Resonant tunneling in a schematic model

abstract:
  Tunneling of an harmonically bound two-body system through an external
Gaussian barrier is studied in a schematic model which allows for a better
understanding of intricate quantum phenomena. The role of finite size and
internal structure is investigated in a consistent treatment. The excitation of
internal degrees of freedom gives rise to a peaked structure in the penetration
factor. The model results indicate that for soft systems the adiabatic limit is
not necessarily reached although often assumed in fusion of nuclei and in
electron screening effects at astrophysical energies.


title: The multilevel pairing Hamiltonian versus the degenerate case

abstract:
  We study the pairing Hamiltonian in a set of non degenerate levels. First, we
review in the path integral framework the spontaneous breaking of the U(1)
symmetry occurring in such a system for the degenerate situation. Then the
behaviors with the coupling constant of the ground state energy in the
multilevel and in the degenerate case are compared. Next we discuss, in the
multilevel case, an exact strong coupling expansion for the ground state energy
which introduces the moments of the single particle level distribution. The
domain of validity of the expansion, which is known in the macroscopic limit,
is explored for finite systems and its implications for the energy of the
latter is discussed. Finally the seniority and Gaudin excitations of the
pairing Hamiltonian are addressed and shown to display the same gap in leading
order.


title: On the stability of Quantum Hadro-Dynamics

abstract:
  We explore the possible occurrence of $\sigma$-$\omega$ condensation in the
Quantum Hadro-Dynamics (QHD), namely the Serot and Walecka model, finding that
at the mean field level it corresponds to a critical value of the coupling
constant $g_\sigma=8.828$ and density $k_F=207.2$ MeV/c, significantly below
the standard value of QHD.


title: Study of Pentaquark and $\Lambda(1405)$

abstract:
  We perform a five-body calculation for pentaquark $(q^4\bar{q})$ state of
$\Lambda(1405)$ as well as the three-body calculations for the ground state
baryons and the $\Lambda(1405)$, and two-body calculations for mesons. The
hamiltonian, which reproduces reasonably well the energies of ground state
baryons ($N,\Lambda,\Sigma,\Xi$ and $\Delta$) and mesons ($\pi,K,\rho,K^\ast$),
includes kinetic energy of semi-relativistic form, linear confinement
potential, and the simplest form of color-magnetic interaction with Gaussian
form factor. Flavor symmetry breaking ($m_s> m_{u,d}$) is taken into account.
The energy calculated for $(q^4\bar{q})$ state of $\Lambda(1405)$ is lower than
the energy for the $(q^3)$ state. The present result suggests that the
$\Lambda(1405)$ is a pentaquark-dominated state if the color-magnetic potential
plays a leading role of the quark-quark and quark-antiquark interactions.


title: Phase Structure in a Hadronic Chiral Model

abstract:
  We study the phase diagram of a hadronic chiral flavor-SU(3) model. Heavy
baryon resonances can induce a phase structure that matches current results
from lattice-QCD calculations at finite temperature and baryon density.
Furthermore, we determine trajectories of constant entropy per net baryon in
the phase diagram.


title: Sigma exchange in the nuclear force and effective field theory

abstract:
  In the phenomenological description of the nuclear interaction a crucial role
is traditionally played by the exchange of a scalar I=0 meson, the sigma, of
mass 500-600 MeV, which however is not seen clearly in the particle spectrum
and which has a very ambiguous status in QCD. I show that a remarkably simple
and reasonably controlled combination of ingredients can reproduce the features
of this part of the nuclear force. The use of chiral perturbation theory
calculations for two pion exchange supplemented by the Omnes function for pion
rescattering suffices to reproduce the magnitude and shape of the exchange of a
supposed $\sigma$ particle, even though no such particle is present in this
calculation. I also show how these ingredients can describe the contact
interaction that enters more modern descriptions of the internucleon
interaction.


title:
Nuclear cross sections in $^{16}\text{O}$ for $\beta$ beam neutrinos at
  intermediate energies

abstract:
  The nuclear cross sections for charged lepton production induced by $\beta$
beam neutrinos (anti-neutrinos) in $^{16}$O have been presented at intermediate
energies corresponding to the Lorentz boost factor $\gamma<250 (150)$. The
calculations for quasi-elastic lepton production includes the effect of Pauli
blocking, Fermi motion and renormalization of weak transition strengths in the
nuclear medium. The calculations for the inelastic lepton production is done in
the $\Delta$ dominance model. The renormalization of $\Delta$ properties in a
nuclear medium and final state interactions of pions with the final nucleus are
taken into account. The results may be useful in performing feasibility studies
for the future CERN-FREJUS base line neutrino oscillation experiments.


title:
Few body impulse and fixed scatterer approximations for high energy
  scattering

abstract:
  The elastic scattering differential cross section is calculated for proton
scattering from $^6$He at 717 MeV, using single scattering terms of the
multiple scattering expansion of the total transition amplitude (MST). We
analyse the effects of different scattering frameworks, specifically the
Factorized Impulse Approximation (FIA) and the Fixed Scatterer (adiabatic)
Approximation (FSA) and the uncertainties associated with the use different
structure models.


title:
Low-energy pions in nuclear matter and 2pi photoproduction within a BUU
  transport model

abstract:
  A description of low-energy scattering of pions and nuclei within a BUU
transport model is presented. Implementing different scenarios of medium
modifications, the mean free path of pions in nuclear matter at low momenta and
pion absorption reactions on nuclei have been studied and compared to data and
to results obtained via quantum mechanical scattering theory. We show that even
in a regime of a long pionic wave length the semi-classical transport model is
still a reliable framework for pion kinetic energies greater than ~20-30 MeV.
Results are presented on pion-absorption cross sections in the regime of 10 MeV
< E(kin) < 130 MeV and on photon-induced double-pion production at incident
beam energies of 400-500 MeV.


title:
Effect of three-body elastic scattering on heavy quark momentum
  degradation in the quark-gluon plasma

abstract:
  Heavy quark drag coefficients in the quark-gluon plasma are evaluated in the
perturbative QCD. It is found that for charm quarks the contribution from
three-body elastic scattering is comparable to those from two-body elastic and
radiative scatterings while for bottom quarks it becomes dominant. Using a
schematic expanding fireball model, effects of both two-body and three-body
scatterings on the transverse momentum spectra of heavy quarks produced in
Au+Au collisions at center of mass energy $\sqrt{s_{NN}}=200$ GeV are studied.
Results on electrons from resulting heavy meson decays are compared with
available experimental data.


title: Giant halo in relativistic and non-relativistic approaches

abstract:
  The phenomena of giant halo and halo of neutron-rich even-Ca isotopes are
investigated and compared in the framework of the relativistic continuum
Hartree-Bogoliubov (RCHB) and non-relativistic Skyrme Hartree-Fock-Bogoliubov
(HFB) calculations. With two parameter sets for each of the RCHB and the Skyrme
HFB calculations, it is found that although halo phenomena exist for Ca
isotopes near neutron drip line in both calculations, the halo of the Skyrme
HFB calculations starts at a more neutron-rich nucleus than that of the RCHB
calculations, and the RCHB calculations have larger neutron root-mean-square
(rms) radii systematically in N >= 40 than those of the Skyrme HFB
calculations. The former difference comes from difference in shell structure.
The reasons for the latter can be partly explained by the neutron 3s1/2 orbit,
which causes more than 50% of the difference among the four calculations for
neutron rms radii at 66Ca.


title:
Dispersion Theory and the Low Energy Constants for Neutral Pion
  Photoproduction

abstract:
  The relativistic amplitudes of pion photoproduction are evaluated by
dispersion relations at t=const. The imaginary parts of the amplitudes are
taken from the MAID model covering the absorption spectrum up to center-of-mass
energies W = 2.2 GeV. For sub-threshold kinematics the amplitudes are expanded
in powers of the two independent variables \nu and t related to energy and
momentum transfer. Subtracting the loop corrections from this power series
allows one to determine the counter terms of covariant baryon chiral
perturbation theory. The proposed continuation of the amplitudes into the
unphysical region provides a unique framework to derive the low-energy
constants to any given order as well as an estimate of the higher order terms
by global properties of the absorption spectrum.


title: Scaling and Interference in the Dissociation of Halo Nuclei

abstract:
  The dissociation of halo nuclei through their collision with light and heavy
targets is considered within the Continuum Discretized Coupled Channels theory.
We study the one-proton halo nucleus $^8$B and the one-neutron halo nucleus
$^{11}$Be, as well as the more normal $^7$Be. The procedure previously employed
to extract the Coulomb dissociation cross section by subtracting the nuclear
one is critically assessed, and the scaling law usually assumed for the target
mass dependence of the nuclear breakup cross section is also tested. It is
found that the nuclear breakup cross section for these very loosely bound
nuclei does indeed behave as $a+bA^{1/3}$. However, it does not have the
geometrically inspired form of a circular ring which seems to be the case for
normal nuclei such as $^{7}$Be. We find further that we cannot ignore
Coulomb-nuclear interference effects, which may be constructive or destructive
in nature, and so the errors in previously extracted B(E1) using the
subtraction procedure are almost certainly underestimated.


title:
A new realistic many-body approach for the description of high-energy
  scattering processes off complex nuclei

abstract:
  A linked cluster expansion for the calculation of ground state observables of
nuclei with realistic interactions has been developed. Using the V8' potential
the ground state energy, density and momentum distribution of complex nuclei
have been calculated and found to be in good agreement with the results
obtained within the Fermi Hyper Netted Chain, and Variational Monte Carlo
approaches. Using the same cluster expansion, with wave function and
correlations parameters fixed from the calculation of the ground-state
observables, various high energy scattering processes off complex nuclei have
been calculated taking final state interaction effects into account by means of
the Glauber multiple scattering series.


title:
Pentaquark, cusp and rescattering in single kaon photoproduction off
  deuterium

abstract:
  In very well defined part of the phase space, $K N$ and $\Lambda N$
rescattering depend on on-shell elementary matrix elements and on the low
momentum components of the deuteron wave function. This provides us with the
unique opportunity to study details in the scattering amplitudes that may have
escaped the analysis of reactions induced on a nucleon target by Kaon and
Hyperon beams at low energies. When folded with a typical experimental mass
resolution, a narrow state with a width of 1 MeV would contribute by no more
than 10% to the $KN$ mass spectrum. On the contrary, a cusp would be easily
detected near the $\Sigma$ production threshold in the $\Lambda N$ mass
spectrum.


title:
$\alpha$-$\alpha$ Double Folding Cluster Potential Description of the
  $^{12}$C+$^{24}$Mg System

abstract:
  We present a simultaneous analysis of the elastic scattering and fusion
cross-section data of the $^{12}$C+$^{24}$Mg system around the Coulomb barrier
and over energies by using the microscopic $\alpha$-$\alpha$ double folding
cluster potential within the framework of the optical model and the
coupled-channels formalism. The $\alpha$-$\alpha$ double folding cluster
potential is obtained by using the $\alpha$-cluster distribution densities of
the nuclei in the usual double folding procedure. The microscopic potential
results are compared with the findings of the phenomenological deep and shallow
potentials. It is subsequently shown that only phenomenological deep real,
microscopic nucleon-nucleon and $\alpha$-$\alpha$ double folding cluster
potentials provide a consistent description of the angular distributions and
fusion cross-section data simultaneously. The effect of the inclusion of the
excited states of the target nucleus $^{24}$Mg on the fusion cross-section
predictions is also determined by the coupled-channels calculations, which are
shown to improve the agreement.


title: First-Order Quantum Phase Transition in a Finite System

abstract:
  The dynamics at the critical-point of a general first-order quantum phase
transition in a finite system is examined, from an algebraic perspective.
Suitable Hamiltonians are constructed whose spectra exhibit coexistence of
states corresponding to two degenerate minima in the energy surface separated
by an arbitrary barrier. Explicit expressions are derived for wave functions
and observables at the critical-point.


title: MAID Analysis Techniques

abstract:
  MAID is a unitary isobar model for a partial wave analysis of pion photo- and
electroproduction in the resonance region. It is fitted to the world data and
can give predictions for multipoles, amplitudes, cross sections and
polarization observables in the energy range from pion threshold up to W=2 GeV
and photon virtualities Q^2 < 5 GeV^2. Using more recent experimental results
from Mainz, Bates, Bonn and JLab for Q^2 up to 4.0 GeV^2, the Q^2 dependence of
the helicity couplings A_{1/2}, A_{3/2}, S_{1/2} has been extracted for a
series of four star resonances. We compare single-Q^2 analyses with a
superglobal fit in a new parametrization of Maid2005. Besides the (pion) MAID,
at Mainz we maintain a collection of online programs for partial wave analysis
of eta, eta' and kaon photo- and electroproduction which are all based on
similar footings with field theoretical background and baryon excitations in
Breit-Wigner form.


title: Relativistic eikonal description of A(p,pN) reactions

abstract:
  The authors present a relativistic and cross-section factorized framework for
computing quasielastic A(p,pN) observables at intermediate and high energies.
The model is based on the eikonal approximation and can accomodate both optical
potentials and the Glauber method for dealing with the initial- and final-state
interactions (IFSI). At lower nucleon energies, the optical-potential
philosophy is preferred, whereas at higher energies the Glauber method is more
natural. This versatility in dealing with the IFSI allows one to describe
A(p,pN) reactions in a wide energy range. Most results presented here use
optical potentials as this approach is argued to be the optimum choice for the
kinematics of the experiments considered in the present paper. The properties
of the IFSI factor, a function wherein the entire effect of the IFSI is
contained, are studied in detail. The predictions of the presented framework
are compared with two kinematically different experiments. First, differential
cross sections for quasielastic proton scattering at 1 GeV off 12C, 16O, and
40Ca target nuclei are computed and compared to data from PNPI. Second, the
formalism is applied to the analysis of a 4He(p,2p) experiment at 250 MeV. The
optical-potential calculations are found to be in good agreement with the data
from both experiments, showing the reliability of the adopted model in a wide
energy range.


title: Target mass corrections revisited

abstract:
  We propose a new implementation of target mass corrections to nucleon
structure functions which, unlike existing treatments, has the correct
kinematic threshold behavior at finite Q^2 in the x -> 1 limit. We illustrate
the differences between the new approach and existing prescriptions by
considering specific examples for the F_2 and F_L structure functions, and
discuss the broader implications of our results, which call into question the
notion of universal parton distribution at finite Q^2.


title:
Study of Resonant Structures in a Deformed Mean-Field by the Contour
  Deformation Method in Momentum Space

abstract:
  Solution of the momentum space Schr\"odinger equation in the case of deformed
fields is being addressed. In particular it is shown that a complete set of
single particle states which includes bound, resonant and complex continuum
states may be obtained by the Contour Deformation Method. This generalized
basis in the complex energy plane is known as a Berggren basis. The momentum
space Schr\"odinger equation is an integral equation which is easily solved by
matrix diagonalization routines even for the case of deformed fields. The
method is demonstrated for axial symmetry and a fictitious "deformed $^5$He",
but may be extended to more general deformation and applied to truly deformed
halo nuclei.


title: The Nuclear Central Force in the Chiral Limit

abstract:
  Chiral perturbation theory supplemented by the Omnes function is employed to
study the strength of the isoscalar central nuclear interaction, G_S, in the
chiral limit vs the physical case. A very large modification is seen, i.e.
eta_s = G_S ~ chiral /G_S ~ physical = 1.37 +- 0.10 . This large effect is seen
to arise dominantly at low energy from the extra contributions made by massless
pions at energies near the physical threshold where the physical spectral
function must vanish kinematically. The slope away from the chiral limit, d_S,
is also calculated and is correspondingly large. I also explain why this large
variation is to be expected.


title: Kinetic, time irreversible evolution of the unstable $\pi^{\pm}$ - meson

abstract:
  In Liouville formalism the expression for density matrix, determining the
time evolution of unstable $\pi^{\pm}$ - meson in the framework of unified
formulation of quantum and kinetic dynamics is defined. The eigenvalues problem
is investigated in the framework of Prigogine's principles of description of
nonequilibrium processes at microscopic level. The problem was solved on the
basis of complex spectral representation. It was shown that the approach leads
to Pauli master equation for the weakly interacting system.


title: Entrainment parameters in cold superfluid neutron star core

abstract:
  Hydrodynamical simulations of neutron star cores, based on a two fluid
description in terms of a neutron-proton superfluid mixture, require the
knowledge of the Andreev-Bashkin entrainment matrix which relates the momentum
of one constituent to the currents of both constituents. This matrix is derived
for arbitrary nuclear asymmetry at zero temperature and in the limits of small
relative currents in the framework of the energy density functional theory. The
Skyrme energy density functional is considered as a particular case. General
analytic formulae for the entrainment parameters and various corresponding
effective masses are obtained. These formulae are applied to the liquid core of
a neutron star, composed of an homogeneous plasma of nucleons, electrons and
possibly muons in beta equilibrium.


title: Core Excited Fano-Resonances in Exotic Nuclei

abstract:
  Fano-resonances are investigated as a new continuum excitation mode in exotic
nuclei. By theoretical model calculations we show that the coupling of a single
particle elastic channel to closed core-excited channels leads to sharp
resonances in the low-energy continuum. A signature for such bound states
embedded in the continuum (BSEC) are characteristic interference effects
leading to asymmetric line shapes. Following the quasiparticle-core coupling
model we consider the coupling of 1-QP (one-quasiparticle) and 3-QP components
and find a number of long-living resonance structures close to the particle
threshold. Results for 15C are compared with experimental data, showing that
the experimentally observed spectral distribution and the interference pattern
are in qualitative agreement with a BSEC interpretation.


title: Nucleon-Meson Coupling Constants and Form Factors in the Quark Model

abstract:
  We demonstrate the calculation of the coupling constants and form factors
required by effective hadron lagrangians using the quark model. These relations
follow from equating expressions for strong transition amplitudes in the two
approaches. As examples we derive the NNm nucleon-meson coupling constants and
form factors for m = pi, eta, eta', sigma, a_0, omega and rho, using harmonic
oscillator quark model meson and baryon wavefunctions and the 3P0 decay model;
this is a first step towards deriving a quark-based model of the NN force at
all separations. This technique should be useful in the application of
effective lagrangians to processes in which the lack of data precludes the
direct determination of coupling constants and form factors from experiment.


title:
Density matrix renormalization group approach for many-body open quantum
  systems

abstract:
  The density matrix renormalization group (DMRG) approach is extended to
complex-symmetric density matrices characteristic of many-body open quantum
systems. Within the continuum shell model, we investigate the interplay between
many-body configuration interaction and coupling to open channels. It is shown
that the DMRG technique applied to broad resonances in the unbound neutron-rich
nucleus 7He provides a highly accurate treatment of the coupling to the
non-resonant scattering continuum.


title:
Isoscalar Giant Dipole Resonances in Spherical Nuclei - Macroscopic
  Description

abstract:
  The properties of the Isoscalar Giant Dipole Resonance (ISGDR) and its
electromagnetic structure are investigated within a semiclassical nuclear
Fermi-Fluid dynamical approach. Microscopical calculations pointing to a ISGDR
distribution splitted into two main broad structures is confirmed within the
presented macroscopic approach by the occurence of a ''low-lying'' and a
''high-lying'' state, that are nothing else than the first two overtones of the
same resonance. Macroscopically they are pictured as a combination of
compressional and vortical nuclear flows. In the second part of the paper the
electromagnetic structure of the ISGDR, relevant for reactions with
inelastically scattered electrons, and the relation between the vorticity and
the toroidal dipole moment is analyzed. The relative strengths of the
compresional and vortical collective currents is evaluated by means of
electron-scattering sum-rules.


title: Efimov effect in nuclear three-body resonance decays

abstract:
  We investigate the effects of the nearly fulfilled Efimov conditions on the
properties of three-body resonances. Using the hyper-spheric adiabatic
expansion method we compute energy distributions of fragments in a three-body
decay of a nuclear resonance. As a realistic example we investigate the 1-
state in the halo nucleus 11Li within a three-body 9Li+n+n model.
Characteristic features appear as sharp peaks in the energy distributions.
Their origin, as in the Efimov effect, is in the large two-body s-wave
scattering lengths between the pairs of fragments.


title:
E(5), X(5), and Prolate to Oblate Shape Phase Transitions in
  Relativistic Hartree Bogoliubov Theory

abstract:
  Relativistic mean field theory with the NL3 force is used for producing
potential energy surfaces (PES) for series of isotopes suggested as exhibiting
critical point symmetries. Relatively flat PES are obtained for nuclei showing
the E(5) symmetry, while in nuclei corresponding to the X(5) case, PES with a
bump are obtained. The PES corresponding to the Pt chain of isotopes suggest a
transition from prolate to oblate shapes at 186-Pt.


title:
Relativistic interactions for the meson-two-nucleon system in the
  clothed-particle unitary representation

abstract:
  The method of unitary clothing transformations put forward in relativistic
quantum field theory (QFT) by Greenberg and Schweber and developed by Shirokov
is applied to construct a new family of interactions in the meson-two-nucleon
system. Along with a brief exposition of its basic elements we show a specific
transition from the initial ``bare'' one-meson and one-nucleon operators and
states to their physical ``clothed'' counterparts. We emphasize that the
clothing transformations in question do not alter the original total
Hamiltonian, but provides a conceptually more transparent representation of the
same Hamiltonian in terms of a new set of operators for particles with physical
properties and their relativistic interactions. The Hermitian and
energy-independent interaction operators for the processes piN -> piN, NN -> NN
and NN -> pi NN are derived starting from the Yukawa-type couplings between
fermions (nucleons and antinucleons) and bosons (pi-, eta-, rho-, omega-mesons,
etc.). These types of interaction have a distinctive off-energy-shell structure
which is naturally generated by the unitary transformation that removes from
the Hamiltonian the (three-leg) piNN vertex coupling.


title: SHAREv2: fluctuations and a comprehensive treatment of decay feed-down

abstract:
  This the user's manual for SHARE version 2. SHARE (Statistical Hadronization
with Resonances) is a collection of programs designed for the statistical
analysis of particle production in relativistic heavy-ion collisions. While the
structure of the program remains similar to v1.X, v2 provides several new
features such as evaluation of statistical fluctuations of particle yields, and
a greater versatility, in particular regarding decay feed-down and input/output
structure. This article describes all the new features, with emphasis on
statistical fluctuations.


title:
No-recoil approximation to knock-on exchange potential in the double
  folding model for heavy-ion collisions

abstract:
  We propose the no-recoil approximation, which is valid for heavy systems, for
a double folding nucleus-nucleus potential. With this approximation, the
non-local knock-on exchange contribution becomes a local form. We discuss the
applicability of this approximation for the elastic scattering of $^6$Li +
$^{40}$Ca system. We find that, for this system and heavier, the no-recoil
approximation works as good as another widely used local approximation which
employs a local plane wave for the relative motion between the colliding
nuclei. We also compare the results of the no-recoil calculations with those of
the zero-range approximation often used to handle the knock-on exchange effect.


title: Challenges about entropy

abstract:
  The physical meaning of entropy is analyzed in the context of statistical,
nuclear, atomic physics and cosmology. Only the microcanonical Boltzmann
entropy leads to no contradictions in several simple, elementary and for
thermodynamics important situations. The conventional canonical statistics
implies several serious errors and misinterpretations. This has far reaching
consequences for phase-separations as well for the usual formulations of the
second law. Applications in cosmology suffer under the ubiquitous use of
canonical statistics. New reformulations in terms of microcanonical statistics
are highly demanded but certainly difficult.


title: Kaon-nucleon scattering lengths from kaonic deuterium experiments

abstract:
  The extraction of the S-wave kaon-nucleon scattering lengths a0 and a1 from a
combined analysis of existing kaonic hydrogen and synthetic deuterium data has
been carried out within the framework of a low-energy effective field theory.
It turns out that with the present DEAR central values for the kaonic hydrogen
ground-state energy and width, a solution for a0 and a1 exists only in a
restricted domain of input values for the kaon-deuteron scattering length.
Consequently, measuring this scattering length imposes stringent constraints on
the theoretical description of the kaon-deuteron interactions at low energies.


title:
Charge-independent trend of isoscalar matrix elements along the $N \sim
  Z$ line

abstract:
  Shell model calculations have been carried out using the m-scheme numerical
code {\small ANTOINE} in order to elucidate the particular trend of the
isoscalar matrix elements, $M_0$, for $A=4n+2$ isobaric triplets ranging from
A=18 to A=42. The 2${_1^+}_{(T=1)}$ $\to$ 0${_1^+}_{(T=1)}$ transition
energies, reduced transition probabilities and isoscalar matrix elements are
predicted to a high degree of accuracy. The general agreement of $M_0$ between
those from mirror pairs and those from $T_Z=0$ nuclides support our shell model
calculations. The predicted results tie together recent experimental data, and
the trend of $M_0$ strength along the $sd$ and beginning of the $fp$ shells is
interpreted in terms of the dynamic shell structure. Certain discrepancies
arise at A=18 and A=38 isobaric triplets, which might be explained in terms of
core polarization effects and the low occupancy of the orbits at the extremes
of the $sd$ shell.


title:
A systematic study of the superdeformation of Pb isotopes with
  relativistic mean field theory

abstract:
  The microscopically constrained relativistic mean field theory is used to
investigate the superdeformation for Pb isotopes. The calculations show that
there exists a clear superdeformed minimum in the potential energy surfaces
with four different interactions NL3, PK1, TM1 and NLSH. The excitation energy,
deformation and depth of well in the superdeformed minimum are comparable for
four different interactions. Furthermore the trend for the change of the
superdeformed excitation energy with neutron number is correctly reproduced.
The calculated two-neutron separation energy in the ground state and
superdeformed minimum together with their differences are in agreement with the
data available. The larger energy difference appearing in superdeformed minimum
reflects a lower average level density at superdeformations for Pb isotopes.


title: Spurious Shell Closures in the Relativistic Mean Field Model

abstract:
  Following a systematic theoretical study of the ground-state properties of
over 7000 nuclei from the proton drip line to the neutron drip line in the
relativistic mean field model [Prog. Theor. Phys. 113 (2005) 785], which is in
fair agreement with existing experimental data, we observe a few spurious shell
closures, i.e. proton shell closures at Z=58 and Z=92. These spurious shell
closures are found to persist in all the effective forces of the relativistic
mean field model, e.g. TMA, NL3, PKDD and DD-ME2.


title:
Chiral approach to antikaon s- and p-wave interactions in dense nuclear
  matter

abstract:
  The properties of the antikaons in nuclear matter are investigated from a
chiral unitary approach which incorporates the s- and p-waves of the ${\bar
K}N$ interaction. To obtain the in-medium meson-baryon amplitudes we include,
in a self-consistent way, Pauli blocking effects, meson self-energies corrected
by nuclear short-range correlations and baryon binding potentials. We pay
special attention to investigating the validity of the on-shell factorization,
showing that it cannot be applied in the evaluation of the in-medium
corrections to the p-wave amplitudes. In nuclear matter at saturation energy,
the $\Lambda$ and $\Sigma$ develop an attractive potential of about -30 MeV,
while the $\Sigma^*$ pole remains at the free space value although its width
gets sensibly increased to about 80 MeV. The antikaon also develops a moderate
attraction that does not support the existence of very deep and narrow bound
states, confirming the findings of previous self-consistent calculations.


title:
From non-Hermitian effective operators to large-scale no-core shell
  model calculations for light nuclei

abstract:
  No-core shell model (NCSM) calculations using ab initio effective
interactions are very successful in reproducing experimental nuclear spectra.
The main theoretical approach is the use of effective operators, which include
correlations left out by the truncation of the model space to a numerically
tractable size. We review recent applications of the effective operator
approach, within a NCSM framework, to the renormalization of the
nucleon-nucleon interaction, as well as scalar and tensor operators.


title: Shapes of the Nucleon

abstract:
  Previously defined spin-dependent quark densities that are matrix elements of
specific density operators in proton states of definite spin-polarization
generally have an infinite variety of non-spherical shapes. The present
application is concerned with both charge and matter densities. We show that
the Gross & Agbakpe model nucleon harbors an interesting variety of
non-spherical shapes.


title: Isospin dependence of pseudospin symmetry in nuclear resonant states

abstract:
  The relativistic mean field theory in combination with the analytic
continuation in the coupling constant method is used to determine the energies
and widths of single-particle resonant states in Sn isotopes. It is shown that
there exists clear shell structure in the resonant levels as appearing in the
bound levels. In particular, the isospin dependence of pseudospin symmetry is
clearly shown in the resonant states, is consistent with that in the bound
states, where the splittings of energies and widths between pseudospin doublets
are found in correlation with the quantum numbers of single-particle states, as
well as the nuclear mass number. The similar phenomenon also emerges in the
spin partners.


title:
Application Of Support Vector Machines To Global Prediction Of Nuclear
  Properties

abstract:
  Advances in statistical learning theory present the opportunity to develop
statistical models of quantum many-body systems exhibiting remarkable
predictive power. The potential of such ``theory-thin'' approaches is
illustrated with the application of Support Vector Machines (SVMs) to global
prediction of nuclear properties as functions of proton and neutron numbers $Z$
and $N$ across the nuclidic chart. Based on the principle of structural-risk
minimization, SVMs learn from examples in the existing database of a given
property $Y$, automatically and optimally identify a set of ``support vectors''
corresponding to representative nuclei in the training set, and approximate the
mapping $(Z,N) \to Y$ in terms of these nuclei. Results are reported for
nuclear masses, beta-decay lifetimes, and spins/parities of nuclear ground
states. These results indicate that SVM models can match or even surpass the
predictive performance of the best conventional ``theory-thick'' global models
based on nuclear phenomenology.


title:
3-D unrestricted TDHF fusion calculations using the full Skyrme
  interaction

abstract:
  We present a study of fusion cross sections using a new generation
Time-Dependent Hartree-Fock (TDHF) code which contains no approximations
regarding collision geometry and uses the full Skyrme interaction, including
all of the time-odd terms. In addition, the code uses the Basis-Spline
collocation method for improved numerical accuracy. A comparative study of
fusion cross sections for $^{16}O + ^{16,28}O$ is made with the older TDHF
results and experiments. We present results using the modern Skyrme forces and
discuss the influence of the new terms present in the interaction.


title:
Proton and pion transverse spectra at RHIC from radial flow and finite
  size effects

abstract:
  We show that the proton and pion transverse momentum distributions measured
at RHIC for all collision centralities for pions and most of the collision
centralities for protons, can be simultaneously described in terms of a thermal
model with common values for the radial flow and temperature, when accounting
for the finite size of the interaction region at the time of decoupling. We
show that this description is obtained in terms of a simple scaling law of the
size of the interaction region with the number of participants in the
collision. The behavior of the proton to pion ratio at mid-rapidity can also be
understood as a consequence of the strength of the radial flow and system size
reached at RHIC energies.


title: The reaction pi N to pi pi N in a meson-exchange approach

abstract:
  A resonance model for two-pion production in the pion-nucleon reaction is
developed that includes information obtained in the analysis of pion-nucleon
scattering in a meson-exchange model. The baryonic resonances Delta(1232),
N*(1440), N*(1520), N*(1535), and N*(1650) are included. The model reproduces
the total cross sections up to kinetic energies of the incident pion of 350 MeV
and obtains the shapes of the differential cross sections in reasonable
agreement with the data.


title:
Extended-soft-core Baryon-Baryon Model I. Nucleon-Nucleon Scattering
  (ESC04) Extended-soft-core Baryon-Baryon Model I. Nucleon-Nucleon Scattering
  (ESC04)

abstract:
  The NN results are presented from the extended-soft-core (ESC) interactions.
They cosist of local- and non-local-potentials due to (i) one-boson-exchange
(OBE), pseudo-scalar-, vector-, scalar-, and axial-vector-nonets, (ii)
diffractive exchanges, (iii) two-pseudoscalar-exchange, and (iv)
meson-pair-exchange (MPE). Fits to the pp- and np-data for 0 < T(lab) < 350 MeV
have typical \chi^2/Ndata= 1.15. Used are less than 20 parameters, which are
coupling constants and cut-off masses. The couplings follow rather closely the
pattern predicted by the quark-pair-creation model. As a result the 11
OBE-couplings are rather constrained, i.e. quasi-free. The deuteron binding
energy and several NN scattering lengths are fitted at the same time.


title: Extended-soft-core Baryon-Baryon Model II. Hyperon-Nucleon Interaction

abstract:
  The YN results are presented from the Extended-soft-core (ESC) interactions.
They consist of local- and non-local-potentials due to (i) One-boson-exchange
(OBE), with pseudoscalar-, vector-, scalar-, and axial-vector-nonets, (ii)
Diffractive exchanges, (iii) Two-pseudoscalar exchange, and (iv)
Meson-pair-exchange (MPE). This model, called ESC04, describes NN and YN in a
unified way using broken flavor SU(3)-symmetry. Novel ingredients are the
inclusion of (i) the axial-vector-mesons, (ii) a zero in the scalar- and
axial-vector meson form factors. We describe simultaneous fits to the NN- and
YN-data, using four options in the ESC-model. Very good fits were obtained.
G-matrix calculations with these four options are also reported. The obtained
well depths (U_\Lambda, U_\Sigma, U_\Xi) reveal distinct features of ESC04a-d.
The \Lambda\Lambda-interactions are demonstrated to be consistent with the
observed data of_{\Lambda\Lambda}^6He. The possible three-body effects are
investigated by considering phenomenologically the changes of the vector-meson
masses in a nuclear medium.


title: Low-Energy Kaon-Nucleus Interactions at a \phi-Factory

abstract:
  Scattering and formation experiments can be performed not only with particle
beams, but also, as of old, with particle sources. DA\PhiNE at the c.m. energy
of the \phi is a relatively clean source of low-momentum charged and neutral
kaons. As such, it can allow experiments unthinkable of at conventional kaon
beams. This talk is dedicated to a presentation both of this viewpoint and of
the physics that could be learned in this way.


title:
Physical Origin of Density Dependent Force of the Skyrme Type within the
  Quark Meson Coupling Model

abstract:
  A density dependent, effective nucleon-nucleon force of the Skyrme type is
derived from the quark-meson coupling model -- a self-consistent, relativistic
quark level description of nuclear matter. This new formulation requires no
assumption that the mean scalar field is small and hence constitutes a
significant advance over earlier work. The similarity of the effective
interaction to the widely used SkM$^*$ force encourages us to apply it to a
wide range of nuclear problems, beginning with the binding energies and charge
distributions of doubly magic nuclei. Finding acceptable results in this
conventional arena, we apply the same effective interaction, within the
Hartree-Fock-Bogoliubov approach, to the properties of nuclei far from
stability. The resulting two neutron drip lines and shell quenching are quite
satisfactory. Finally, we apply the relativistic formulation to the properties
of dense nuclear matter in anticipation of future application to the properties
of neutron stars.


title:
How low-energy weak reactions can constrain three-nucleon forces and the
  neutron-neutron scattering length

abstract:
  We show that chiral symmetry and gauge invariance enforce relations between
the short-distance physics that occurs in a number of electroweak and pionic
reactions on light nuclei. Within chiral perturbation theory this is manifested
via the appearance of the same axial isovector two-body contact term in pi- d
-> n n gamma, p-wave pion production in NN collisions, tritium beta decay, pp
fusion, nu d scattering, and the hep reaction. Using a Gamow-Teller matrix
element obtained from calculations of pp fusion as input we compute the neutron
spectrum obtained in pi- d -> n n gamma. With the short-distance physics in
this process controlled from p p -> d e+ nu_e the theoretical uncertainty in
the nn scattering length extracted from pi- d -> n n gamma is reduced by a
factor larger than three, to <~0.05 fm.


title:
Multifragmentation vs. Evaporation vs. Binary-Decay in Fragment
  Production

abstract:
  This paper presents part of an internal LANL Progress Report on completion of
the "S" and "G" versions of the improved Cascade-Exciton Model (CEM03.01) and
the Los Alamos Quark-Gluon String Model (LAQGSM.03.01) codes. The "S" versions
consider fragmentation of compound nuclei produced after the preequilibrium
stage of reactions for excitation energies above 2A MeV using the Statistical
Multifragmentation Model (SMM) by Botvina et al. ("S" stands for SMM), while
the "G" versions describe evaporation/fission stages of reactions using the
fission-like binary-decay model GEMINI of Charity et al. ("G" stands for
GEMINI) instead of using the the Generalized Evaporation Model GEM2 of Furihata
incorporated into the standard versions of these codes. We present here an
analysis of the recent 660 MeV p + 129I and 3.65 GeV p + 112Sn JINR
measurements, of the new COSY data on 1.2 GeV p + (13 nuclei from Al to Th), of
the 300 MeV and 1 GeV p + 56Fe data measured at GSI in inverse kinematics, and
of the new GSI data on 1 GeV/nucleon 124Xe and 136Xe + Pb. To better understand
the mechanisms of fragment production, we discuss several calculated but
not-yet-measured kinematic characteristics of products of these reactions,
which are predicted to be quite different by SMM, GEMINI, and GEM2. We find
these kinematic quantities to be potentially useful in differentiating these
reaction mechanisms if they can be measured in future experiments.


title: The Paschos-Wolfenstein relation in a hadronic picture

abstract:
  The Paschos-Wolfenstein (PW) relation joins neutral- and charged-current
neutrino- and antineutrino-induced cross sections into an expression that
depends on the weak mixing angle $\sin^2 \theta_W$. Contrary to the traditional
approach with partonic degrees of freedom, we adopt a model built on hadronic
degrees of freedom to perform a study of the PW relation at intermediate
energies (100 MeV to 2 GeV). With upcoming high-statistics scattering
experiments such as MINER$\nu$A and FINeSSE, a scrutiny of the PW relation is
timely. Employing a relativistic Glauber nucleon knockout model for the
description of quasielastic neutrino-nucleus reactions, the influence of
nuclear effects on the PW relation is investigated. We discuss nuclear-model
dependences and show that the PW relation is a robust ratio, mitigating the
effect of final-state interactions, for example to the 1% level. The role
played by a possible strangeness content of the nucleon is investigated. It
appears that the uncertainties arising from the poorly known strangeness
parameters and the difficulties in nuclear modelling seriously limit the
applicability of the PW relation as an intermediate-energy electroweak
precision tool. On the other hand, we show that nuclear effects may be
sufficiently well under control to allow the extraction of new information on
the axial strangeness parameter. Results are presented for $^{16} {O}$ and
$^{56} {Fe}$.


title: Scaling Functions and Superscaling in Medium and Heavy Nuclei

abstract:
  The scaling function $f(\psi')$ for medium and heavy nuclei with $Z\neq N$
for which the proton and neutron densities are not similar is constructed
within the coherent density fluctuation model (CDFM) as a sum of the proton and
neutron scaling functions. The latter are calculated in the cases of $^{62}$Ni,
$^{82}$Kr, $^{118}$Sn, and $^{197}$Au nuclei on the basis of the corresponding
proton and neutron density distributions which are obtained in deformed
self-consistent mean-field Skyrme HF+BCS method. The results are in a
reasonable agreement with the empirical data from the inclusive electron
scattering from nuclei showing superscaling for negative values of $\psi'$,
including those smaller than -1. This is an improvement over the relativistic
Fermi gas (RFG) model predictions where $f(\psi')$ becomes abruptly zero for
$\psi'\leq -1$. It is also an improvement over the CDFM calculations made in
the past for nuclei with $Z\neq N$ assuming that the neutron density is equal
to the proton one and using only the phenomenological charge density.


title:
Energy losses in the black disc regime and correlation effects in the
  STAR forward pion production in dAu collisions

abstract:
  We argue that in the small x processes, in the black disc QCD regime (BDR) a
very forward parton propagating through the nuclear matter should loose a
significant and increasing with energy and atomic number fraction of its
initial energy as a result of dominance of inelastic interactions, causality
and energy-momentum conservation. We evaluate these energy losses and find them
to lead to the significant suppression of the forward jet production in the
central NA collisions at collider energies with a moderate suppression of
recoiling jet at central rapidities. We confront our expectations with the
recent RHIC data of the STAR collaboration on the probability, $P$, for
emission of at least one fast hadron at a central rapidity in association with
production of a very forward high $p_t$ neutral pion in $pp$ and $dAu$
collisions. We calculate the A-dependence of $P$, and find that the data imply
a strong suppression of leading pion production at central impact parameters.
We also conclude that production of recoil jets in the hard subprocess is not
suppressed providing further evidence for the dominance of peripheral
collisions. Both features of the data are consistent with the onset of BDR. We
suggest new phenomena and new observables to investigate BDR at RHIC and LHC.


title: Probing the symmetry energy and the degree of isospin equilibrium

abstract:
  The rapidity dependence of the single- and double- neutron to proton ratios
of nucleon emission from isospin-asymmetric but mass-symmetric reactions Zr+Ru
and Ru+Zr at energy range $100 \sim 800$ A MeV and impact parameter range
$0\sim 8$ fm is investigated. The reaction system with isospin-asymmetry and
mass-symmetry has the advantage of simultaneously showing up the dependence on
the symmetry energy and the degree of the isospin equilibrium. We find that the
beam energy- and the impact parameter dependence of the slope parameter of the
double neutron to proton ratio ($F_D$) as function of rapidity are quite
sensitive to the density dependence of symmetry energy, especially at energies
$E_b\sim 400$ A MeV and reduced impact parameters around 0.5. Here the symmetry
energy effect on the $F_D$ is enhanced, as compared to the single neutron to
proton ratio. The degree of the equilibrium with respect to isospin (isospin
mixing) in terms of the $F_D$ is addressed and its dependence on the symmetry
energy is also discussed.


title:
Microscopic description of the pygmy and giant electric dipole
  resonances in stable Ca isotopes

abstract:
  The properties of the pygmy (PDR) and giant dipole resonance (GDR)in the
stable $^{40}Ca$,$^{44}Ca$ and $^{48}Ca$ isotopes have been calculated within
the \emph{Extended Theory of Finite Fermi Systems}(ETFFS). This approach is
based on the random phase approximation (RPA) and includes the single particle
continuum as well as the coupling to low-lying collectives states which are
considered in a consistent microscopic way. For $^{44}Ca$ we also include
pairing correlations. We obtain good agreement with the experimental data for
the gross properties of both resonances. It is demonstrated that the recently
measured A-dependence of the strength of the PDR below 10 MeV is well
understood in our model:due to the phonon coupling some of the strength in
$^{48}Ca$ is simply shifted beyond 10 MeV. The predicted fragmentation of the
PDR can be investigated in $(e,e')$ and $(\gamma ,\gamma')$ experiments.
Whereas the isovector dipole strength of the PDR is small in all Ca isotopes,
we find in this region surprisingly strong isoscalar dipole states, in
agreement with an $(\alpha,\alpha'\gamma)$ experiment. We conclude that for the
detailed understanding of the structure of excited nuclei e.g. the PDR and GDR
an approach like the present one is absolutely necessary.


title:
Landau Migdal Theory of Interacting Fermi Systems: A Framework for
  Effective Theories in Nuclear Structure Physics

abstract:
  We review Migdal's Theory of Finite Fermi Systems and its application to the
structure of nuclei. The theory is an extension of Landau's Theory of
Interacting Fermi Systems. In the first part the basic formulas are derived
within the many body Green functions approach. The theory is applied to
isovector electric giant resonances in medium and heavy mass nuclei. The
parameterizations of the enormalized effective ph-interaction and the effective
operators are discussed. It is shown that the number of free parameters are
restricted due to conservation laws. We also present an extension of Migdal's
theory, where the low-lying phonons are considered in a consistent manner. The
extended theory is again applied to the same isovector electric giant
resonances and to the analysis of $(\alpha,\alpha^\prime)$ reaction data. We
point out that the extended theory is the appropriate frame for self consistent
nuclear structure calculations starting from effective Lagrangians and
Hamiltonians.


title:
Proton enhancement at large p_T at LHC without structure in
  associated-particle distribution

abstract:
  The production of pions and protons in the $p_T$ range between 10 and 20
GeV/c for Pb+Pb collisions at LHC is studied in the recombination model. It is
shown that the dominant mechanism for hadronization is the recombination of
shower partons from neighboring jets when the jet density is high. Protons are
more copiously produced than pions in that $p_T$ range because the coalescing
partons can have lower momentum fractions, but no thermal partons are involved.
The proton-to-pion ratio can rise beyond 20. When such a high $p_T$ hadron is
used as a trigger particle, there will not be any associated particles that are
not in the background.


title: Radii and Binding Energies of Nuclei in the Alpha-Cluster Model

abstract:
  The alpha-cluster model is based on two assumptions that the proton-neutron
pair interactions are responsible for adherence between alpha-clusters and that
the NN-interaction in the alpha-clusters is isospin independent. It allows one
to estimate the Coulomb energy and the short range inter-cluster bond energy in
dependence on the number of clusters. The charge radii are calculated on the
number of alpha-clusters too. Unlike the Weizsacker formula in this model the
binding energies of alpha-clusters and excess neutrons are estimated
separately. The calculated values are in a good agreement with the experimental
data.


title: Liquid-gas instability and superfluidity in nuclear matter

abstract:
  We study effects of the medium polarization on superfluidity in symmetric
nuclear matter in a relativistic formalism. An effect of the liquid-gas
instability is emphasized. We examine two types of decomposition of the nucleon
propagator; the standard Feynman-density and the particle-hole-antiparticle
ones. In both cases, the medium polarization effect is determined by a
characteristic cancellation among the \sigma, the longitudinal \omega, and the
\sigma-\omega mixed polarizations. The instability leads to increase of pairing
gap. Around the saturation density that is free from the instability the medium
polarization enhances pairing gap in the former case whereas reduces in the
latter. At the lowest density that is also free from the instability the gap
increases in both cases.


title: The nucleon-sigma coupling constant in QCD Sum Rules

abstract:
  The external-field QCD Sum Rules method is used to evaluate the coupling
constant of the light isoscalar-scalar meson (``$\sigma$'' or \epsilon) to the
nucleon. The contributions that come from the excited nucleon states and the
response of the continuum threshold to the external field are calculated. The
obtained value of the coupling constant is compatible with the large value
required in one-boson exchange potential models of the two-nucleon interaction.


title:
Parity shift and beat staggering structure of octupole bands in a
  collective model for quadrupole-octupole deformed nuclei

abstract:
  We propose a collective model formalism which describes the strong parity
shift observed in low-lying spectra of nuclei with octupole deformations
together with the fine rotational band structure developed at higher angular
momenta. The parity effect is obtained by the Schroedinger equation for
oscillations of the reflection asymmetric (octupole) shape between two opposite
orientations in an angular momentum dependent double-well potential. The
rotational structure is obtained by a collective quadrupole-octupole rotation
Hamiltonian. The model scheme reproduces the complicated beat staggering
patterns observed in the octupole bands of light actinide nuclei. It explains
the angular momentum evolution of octupole spectra as the interplay between the
octupole shape oscillation (parity shift) mode and the stable
quadrupole-octupole rotation mode.


title: Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules

abstract:
  The external-field QCD Sum Rules method is used to evaluate the coupling
constants of the light-isoscalar scalar meson (``\sigma'' or \epsilon) to the
\Lambda, \Sigma, and \Xi baryons. It is shown that these coupling constants as
calculated from QCD Sum Rules are consistent with SU(3)-flavor relations, which
leads to a determination of the F/(F+D) ratio of the scalar octet assuming
ideal mixing: we find \alpha_s \equiv F/(F+D)=0.55. The coupling constants with
SU(3) breaking effects are also discussed.


title:
Nuclear collective motion with a coherent coupling interaction between
  quadrupole and octupole modes

abstract:
  A collective Hamiltonian for the rotation-vibration motion of nuclei is
considered, in which the axial quadrupole and octupole degrees of freedom are
coupled through the centrifugal interaction. The potential of the system
depends on the two deformation variables $\beta_2$ and $\beta_3$. The system is
considered to oscillate between positive and negative $\beta_3$-values, by
rounding an infinite potential core in the $(\beta_2,\beta_3)$-plane with
$\beta_2>0$. By assuming a coherent contribution of the quadrupole and octupole
oscillation modes in the collective motion, the energy spectrum is derived in
an explicit analytic form, providing specific parity shift effects. On this
basis several possible ways in the evolution of quadrupole-octupole
collectivity are outlined. A particular application of the model to the energy
levels and electric transition probabilities in alternating parity spectra of
the nuclei $^{150}$Nd, $^{152}$Sm, $^{154}$Gd and $^{156}$Dy is presented.


title: Giant neutron halos in the non-relativistic mean field approach

abstract:
  Giant neutron halos in medium-heavy nuclei are studied in the framework of
the Hartree-Fock-Bogoliubov (HFB) approach with Skyrme interactions. The
appearance of such structures depends sensitively on the effective interaction
adopted. This is illustrated by comparing the predictions of SLy4 and SkI4 in
the Ca and Zr isotopic chains. The former force gives no halo effect, the
latter predicts a neutron halo in the Zr chain with A>122 due to the weakly
bound orbitals 3p1/2 and 3p3/2. The structure of the halo is analyzed in terms
of the occupation probabilities of these orbitals and their partial
contributions to the neutron density. The anti-halo effect in Ni and Zr
isotopes is also discussed by comparing the occupation probabilities of
Hartree-Fock neutron single-particle states near the Fermi energy with the
corresponding HFB quasiparticle states.


title: Semileptonic Decays of Heavy Omega Baryons in a Quark Model

abstract:
  The semileptonic decays of $\Omega_c$ and $\Omega_b$ are treated in the
framework of a constituent quark model developed in a previous paper on the
semileptonic decays of heavy $\Lambda$ baryons. Analytic results for the form
factors for the decays to ground states and a number of excited states are
evaluated. For $\Omega_b$ to $\Omega_c$ the form factors obtained are shown to
satisfy the relations predicted at leading order in the heavy-quark effective
theory at the non-recoil point. A modified fit of nonrelativistic and
semirelativistic Hamiltonians generates configuration-mixed baryon wave
functions from the known masses and the measured $\lcle$ rate, with wave
functions expanded in both harmonic oscillator and Sturmian bases. Decay rates
of $\ob$ to pairs of ground and excited $\omc$ states related by heavy-quark
symmetry calculated using these configuration-mixed wave functions are in the
ratios expected from heavy-quark effective theory, to a good approximation. Our
predictions for the semileptonic elastic branching fraction of $\Omega_Q$ vary
minimally within the models we use. We obtain an average value of (84$\pm$ 2%)
for the fraction of $\Omega_c\to \Xi^{(*)}$ decays to ground states, and 91%
for the fraction of $\Omega_c\to \Omega^{(*)}$ decays to the ground state
$\Omega$. The elastic fraction of $\ob \to \omc$ ranges from about 50%
calculated with the two harmonic-oscillator models, to about 67% calculated
with the two Sturmian models.


title:
Self-consistent description of multipole strength: systematic
  calculations

abstract:
  We use the quasiparticle random phase approximation with a few Skyrme density
functionals to calculate strength functions in the Jpi = 0+, 1-, and 2+
channels for even Ca, Ni, and Sn isotopes, from the proton drip line to the
neutron drip line. We show where and how low-lying strength begins to appear as
N increases. We also exhibit partial energy-weighted sums of the transition
strength as functions of N for all nuclei calculated, and transition densities
for many of the interesting peaks. We find that low-energy strength increases
with N in all multipoles, but with distinctive features in each. The low-lying
0+ strength near the neutron at large N barely involves protons at all, with
the strength coming primarily from a single two-quasineutron configuration with
very large spatial extent. The low-lying 1- strength is different, with protons
contributing to the transition density in the nuclear interior together with
neutrons at large radii. The low-lying 2+ transition strength goes largely to
more localized states. The three Skyrme interactions we test produce similar
results, differing most significantly in their predictions for the location of
the neutron drip line, the boundaries of deformed regions, energies of and
transition strengths to the lowest 2+ states between closed shells, and
isovector energy-weighted sum rules.


title: Cooling of Color Superconducting Compact Stars

abstract:
  We review the status of research on the cooling of compact stars, with
emphasis on the influence of color superconducting quark matter phases.
Although a consistent microscopic approach is not yet available, severe
constraints on the phase structure of matter at high densities come from recent
mass and cooling observations of compact stars.


title: Various cluster radioactivities above magic nuclei

abstract:
  We present parameter-free tunneling calculations for various cluster
radioactivities including the diproton decays of atomic nuclei. An uniform
folded cluster potential has been suggested that is based on a self-consistent
mean-field model, with the folding factor determined using the quantization
conditions of the quasibound cluster state. We have investigated the
$\alpha$-particle and heavier-cluster decays of trans-$^{100}$Sn and
trans-$^{208}$Pb nuclei, and the observed diproton emission from the proton
drip-line nucleus $^{16}$Ne, showing the overall reasonable descriptions of
cluster radioactivities with calculated half-lives agreeing well with
experimental data. We have also predicted the properties of yet unobserved
cluster decays of the exotic nuclei $^{112,114}$Ba, $^{104}$Te and $^{38}$Ti.


title:
Characteristic form of boost-invariant and cylindrically non-symmetric
  hydrodynamic equations

abstract:
  It is shown that the boost-invariant and cylindrically non-symmetric
hydrodynamic equations for baryon-free matter may be reduced to only two
coupled differential equations. In the case where the system exhibits the
cross-over phase transition, the standard numerical methods may be applied to
solve these equations and the proposed scheme allows for a very convenient
analysis of the cylindrically non-symmetric hydrodynamic expansion.


title: Collisional Energy Loss in a Finite Size QCD Matter

abstract:
  Computation of collisional energy loss in a finite size QCD medium has become
crucial to obtain reliable predictions for jet quenching in ultra-relativistic
heavy ion collisions. We here compute this energy loss up to the zeroth order
in opacity. Our approach consistently treats both soft and hard contributions
to the collisional energy loss. Consequently, it removes the unphysical energy
gain in a region of lower momenta obtained by previous computations. Most
importantly, we show that for characteristic QCD medium scales, finite size
effects on the collisional energy loss are not significant.


title: Simple models for shell-model configuration densities

abstract:
  We consider the secular behavior of shell-model configuration (partial)
densities. When configuration densities are characterized by their moments, one
often finds large third moments, which can make suitable parameterization of
the secular behavior problematic. We review several parameterizations or
models, and consider in depth three specific models: Cornish-Fisher, binomial,
and modified Breit-Wigner distributions. Of these three the modified
Breit-Wigner provides the best secular approximation to exact numerical
configuration densities computed via full diagonalization from realistic
interactions.


title:
Pseudo-spin symmetry in density-dependent relativistic Hartree-Fock
  theory

abstract:
  The pseudo-spin symmetry (PSS) is investigated in the density-dependent
relativistic Hartree-Fock theory by taking {the} doubly magic nucleus
$^{132}$Sn as a representative. It is found that the Fock terms bring
significant contributions to the pseudo-spin orbital potentials (PSOP) and make
it comparable to the pseudo-centrifugal barrier (PCB). However, these Fock
terms in the PSOP are counteracted by other exchange terms due to the
non-locality of the exchange potentials. The pseudo-spin orbital splitting
indicates that the PSS is preserved well for the partner states $\lrb{\nu
3s_{1/2}, \nu2d_{3/2}}$ of $^{132}$Sn in the relativistic Hartree-Fock theory.


title:
Beyond mean-field study of excited states: Analysis within the Lipkin
  model

abstract:
  Beyond mean-field methods based on restoration of symmetries and
configuration mixing by the generator coordinate method (GCM) enable to
calculate on the same footing correlations in the ground state and the
properties of excited states. Excitation energies are often largely
overestimated, especially in nuclei close to magicity, even when transition
probabilities are well-described. We analyse here the origin of this failure.
The first part of the paper compares realistic projected GCM and QRPA
calculations for selected Sn isotopes performed with the same effective Skyrme
interaction. Although it is difficult to perform RPA and GCM calculations under
exactly the same conditions, this comparison shows that the projected GCM
overestimates the RPA results. In the second part of this paper, we compare GCM
and RPA in the framework of the exactly solvable Lipkin-Meshkov-Glick model. We
show that the discretized GCM works quite well and permits to obtain nearly
exact results with a small number of discretization points. This analysis
indicates also that to break more symmetries of the nuclear Hamiltonian in the
construction of the GCM basis is probably the best way to improve the
description of excited states by the GCM.


title: Model independent study of the nucleon self-energy in matter

abstract:
  Relativistic and non-relativistic modern nucleon-nucleon potentials are
mapped on a relativistic operator basis using projection techniques. This
allows to compare the various potentials at the level of covariant amplitudes
were a remarkable agreement is found. In nuclear matter large scalar and vector
mean fields of several hundred MeV magnitude are generated at tree level. This
is found to be a model independent feature of the nucleon-nucleon interaction.


title:
Total Prompt Energy Release in the Neutron-Induced Fission of 235-U,
  238-U, and 239-Pu

abstract:
  This study addresses, for the first time, the total prompt energy release and
its components for the fission of 235-U, 238-U, and 239-Pu as a function of the
kinetic energy of the neutron inducing the fission. The components are
extracted from experimental measurements, where they exist, together with
model-dependent calculation, interpolation, and extrapolation. While the
components display clear dependencies upon the incident neutron energy, their
sums display only weak, yet definite, energy dependencies. Also addressed is
the total prompt energy deposition in fission for the same three systems.
Results are presented in equation form. New measurements are recommended as a
consequence of this study.


title:
Predictions of striking energy and angular dependence in pp -->
  (pp)_S-wave pi^0 production

abstract:
  A phenomenological calculation from threshold to 800 MeV of the initial
proton beam energy is presented to describe recent data on the reaction pp -->
(pp)_S-wave pi^0 with a low energy cut on the final state diproton excitation
energy. A strong forward dip is obtained in the differential cross section as
in the data from COSY at 800 MeV, although the absolute value of the forward
cross section is too low. Earlier low energy data from CELSIUS are reasonably
well reproduced. In the unexplored energy interval between these two
experiments the model predicts a spectacular energy dependence both in the
forward direction and in the angle-integrated cross section.


title: High density behaviour of nuclear symmetry energy

abstract:
  Role of the isospin asymmetry in nuclei and neutron stars, with an emphasis
on the density dependence of the nuclear symmetry energy, is discussed. The
symmetry energy is obtained using the isoscalar as well as isovector components
of the density dependent M3Y effective interaction. The constants of density
dependence of the effective interaction are obtained by reproducing the
saturation energy per nucleon and the saturation density of spin and isospin
symmetric cold infinite nuclear matter. Implications for the density dependence
of the symmetry energy in case of a neutron star are discussed, and also
possible constraints on the density dependence obtained from finite nuclei are
compared.


title:
Proton-neutron multiplets in exotic 134Sb: testing the shell-model
  effective interaction

abstract:
  The experimental level structure of 134Sb is compared with the results of a
shell-model calculation in which the two-body matrix elements of the effective
interaction have been derived from the CD-Bonn nucleon-nucleon potential. The
experimental data, including the very low-lying first-excited 1- state, are
remarkably well reproduced by the theory. The results of this paper complement
those of our previous studies on 135Sb and 134Sn, showing that our effective
interaction is well suited to describe 132Sn neighbors beyond N=82. The various
terms which contribute to the matrix elements of the proton-neutron effective
interaction are examined and their relative importance is evidenced.


title: Low energy transfer cross-section for Borromean halo nuclei

abstract:
  We describe a schematic coupled channels transfer calculation for the
reaction 6He + 238U at near-barrier energies. We also present a simple
semiclassical DWBA calculation of the two neutron transfer. Both calculations
are meant to supply the conditions under which the transfer cross section
becomes much larger than the complete fusion one at sub-barrier energies. It
seems that a feasible mechanism is the incoherent contributions of two or more
processes with quite different Q-vlaues.


title: Nuclear Masses, Chaos, and the Residual Interaction

abstract:
  We interpret the discrepancy between semiempirical nuclear mass formulas and
actual nuclear masses in terms of the residual interaction. We show that
correlations exist among all binding energies and all separation energies
throughout the valley of stability. We relate our approach to chaotic motion in
nuclei.


title: Correlations and effective interactions in nuclear matter

abstract:
  We performed Self-Consistent Greens Function (SCGF) calculations for
symmetric nuclear matter using realistic nucleon-nucleon (NN) interactions and
effective low-momentum interactions ($V_{low-k}$), which are derived from such
realistic NN interactions. We compare the spectral distributions resulting from
such calculations. We also introduce a density-dependent effective low-momentum
interaction which accounts for the dispersive effects in the single-particle
propagator in the medium.


title:
Final state interactions in electron scattering at high missing energies
  and momenta

abstract:
  Calculations of two-step rescattering and pion emission for the 12C(e,e'p)
reaction at very large missing energies and momenta are compared with recent
data from TJNAF. For parallel kinematics, final state interactions are strongly
reduced by kinematical constraints. A good agreement between calculation and
experiment is found for this kinematics when one admits the presence of high
momentum components in the nuclear wave function.


title: Single particle spectra based of modern effective interactions

abstract:
  The self-consistent Green's function method is applied to 16O using a
G-matrix and Vucom as effective interactions, both derived from the Argonne v18
potential. The present calculations are performed in a larger model space than
previously possible. The experimental single particle spectra obtained with the
G-matrix are essentially independent of the oscillator length of the basis. The
results shows that Vucom better reproduces spin-orbit splittings but tends to
overestimate the gap at the Fermi energy.


title: Transverse flow in relativistic viscous hydrodynamics

abstract:
  Hydrodynamic model simulations of Au-Au collisions at RHIC have indicated
recently, that with improved simulations in the coming years, it may be
feasible to quantify the viscosity of the matter produced in heavy ion
collisions. To this end, a consistent fluid dynamic description of viscous
effects is clearly needed. In this note, we observe that a recently used,
approximate form of the 2nd order Israel-Stewart viscous hydrodynamic equations
of motion cannot account consistently for the transverse flow fields, which are
expected to develop in heavy ion collisions. We identify the appropriate
equations of motion.


title: Viscosity at RHIC

abstract:
  A variety of physical phenomena can lead to viscous effects. In this talk we
review several sources of shear and bulk viscosity with an emphasis on the bulk
viscosity associated with chiral restoration. We show that in the limit of a
second order phase transition, the viscosity peaks in a singularity at the
critical point.


title: Origins of Bulk Viscosity at RHIC

abstract:
  A variety of physical phenomena can lead to viscous effects. Several sources
of shear and bulk viscosity are reviewed with an emphasis on the bulk viscosity
associated with chiral restoration and with chemical non-equilibrium. We show
that in a mean-field treatment of the limiting case of a second order phase
transition, the bulk viscosity peaks in a singularity at the critical point.


title: Channel coupling effects in $\rho$-meson photoproduction

abstract:
  We investigate $\rho$-meson photoproduction in a coupled-channels
formulation. It is shown that channel coupling effects are large and account
for discrepancies observed in several single-channel treatments.


title: TDHF fusion calculations for spherical+deformed systems

abstract:
  We outline a formalism to carry out TDHF calculations of fusion cross
sections for spherical + deformed nuclei. The procedure incorporates the
dynamic alignment of the deformed nucleus into the calculation of the fusion
cross section. The alignment results from multiple E2/E4 Coulomb excitation of
the ground state rotational band. Implications for TDHF fusion calculations are
discussed. TDHF calculations are done in an unrestricted three-dimensional
geometry using modern Skyrme force parametrizations.


title: Fission modes of 256Fm and 258Fm in a microscopic approach

abstract:
  A static microscopic study of potential-energy surfaces within the
Skyrme-Hartree-Fock-plus-BCS model is carried out for the 256Fm and 258Fm
isotopes with the goal of deducing some properties of spontaneous fission. The
calculated fission modes are found to be in agreement with the experimentaly
observed asymmetric-to-symmetric transition in the fragment-mass distributions
and with the high- and low-total-kinetic-energy modes experimentally observed
in 258Fm. Most of the results are similar to those obtained in
macroscopic-microscopic models as well as in recent Hartree-Fock-Bogolyubov
calculations with the Gogny interaction, with a few differences in their
interpretations. In particular an alternative explanation is proposed for the
low-energy fission mode of 258Fm.


title:
Evidence for the Strong Dominance of Proton-Neutron Correlations in
  Nuclei

abstract:
  We analyze recent data from high-momentum-transfer $(p,pp)$ and $(p,ppn)$
reactions on Carbon. For this analysis, the two-nucleon short-range correlation
(NN-SRC) model for backward nucleon emission is extended to include the motion
of the NN-pair in the mean field. The model is found to describe major
characteristics of the data. Our analysis demonstrates that the removal of a
proton from the nucleus with initial momentum 275-550 MeV/c is $92^{+8}_{-18}%$
of the time accompanied by the emission of a correlated neutron that carries
momentum roughly equal and opposite to the initial proton momentum. Within the
NN-SRC dominance assumption the data indicate that the probabilities of $pp$ or
$nn$ SRCs in the nucleus are at least a factor of six smaller than that of $pn$
SRCs. Our result is the first estimate of the isospin structure of NN-SRCs in
nuclei, and may have important implication for modeling the equation of state
of asymmetric nuclear matter.