title: A Particle number conserving shell-correction method

abstract:
  The shell correction method is revisited. Contrary to the traditional
Strutinsky method, the shell energy is evaluated by an averaging over the
number of particles and not over the single-particle energies, which is more
consistent with the definition of the macroscopic energy. In addition, the
smooth background is subtracted before averaging the sum of single-particle
energies, which significantly improves the plateau condition and allows to
apply the method also for nuclei close to the proton or neutron drip lines. A
significant difference between the shell correction energy obtained with the
traditional and the new method is found in particular for highly degenerated
single-particle spectra (as i.e. in magic nuclei) while for deformed nuclei
(where the degeneracy is lifted to a large extent) both estimates are close,
except in the region of super or hyper-deformed states.


title: Theory of rapid (nonadiabatic) rotation of nonspherical nuclei

abstract:
  On the basis of the concept of the growing role of nonadiabatic effects of
the non-conservation of the quantum number $K,$ a theory has been developed of
the phenomenon which has been given the name of backbending. Above the
transition point, for $J\geq J_c$, all the values $-J\leq K\leq J$ are equally
probable. An investigation is made of the singularities possessed by the
ordering parameter (proportional to the spectroscopic quadrupole moment of a
nonspherical nucleus), the rotational angular velocity and the moment of
inertia of a nucleus at the Curie point. Formulas have been derived for the
intensity of quadrupole radiation in the more symmetric $n$-phase $J> J_c$. By
analyzing the experimental values of the moments of inertia belonging to the
$n$-phase, the radius of the mass distribution in the nucleus was determined.
It agrees with the radius of the proton distribution derived from data on the
scattering of electrons by nuclei. On the basis of the simplest form of the
singularity of the parametric derivative of the Hamiltonian of the system a
general theory of zero-temperature second-order phase transitions is developed
in the Appendix.


title: Predicted cross sections for photon-induced particle emission

abstract:
  Cross sections for the photon-induced particle-emission reactions (gamma,n),
(gamma,p), and (gamma,alpha) are given for all natural isotopes from Ti to Bi.
The target nuclei are assumed to be in their ground states, except for 180Ta
which is naturally occurring as the isomer 180mTa. The cross sections are
calculated in a statistical model (Hauser-Feshbach) approach and covering an
energy range from threshold up to 7.35 MeV above the threshold (14.7 MeV above
threshold for (gamma,alpha) reactions). The results are intended to aid
conception and analysis of experiments which can also be used to test the
methods involved in predicting astrophysical reaction rates for
nucleosynthesis.


title: QCD motivated three-body force and light nuclei

abstract:
  The need for the three-body forces (3BF) for reproduction of physical
properties of light nuclei has been evident for some time. These 3BF are doing
quite well for light nuclei, but there seems to be scope for other 3BF which
may arise from other physical considerations not included so far. Here we
discuss a QCD motivated new 3BF which should be included in studies of nuclei,
in particular the light one3s. We perform variational Monte Carlo calculations
including this new 3BF and discuss improvements brought in thereby for light
nuclei.


title:
Microscopic determination of the nuclear incompressibility within the
  non-relativistic framework

abstract:
  The nuclear incompressibility $K_\infty$ is deduced from measurements of the
Isoscalar Giant Monopole Resonance (ISGMR) in medium-heavy nuclei, and the
resulting value turns out to be model dependent. Since the considered nuclei
have neutron excess, it has been suggested that the model dependence is due to
the different behaviour of the symmetry energy in different models. To clarify
this issue, we make a systematic and careful analysis based on new Skyrme
forces which span a wide range of values for $K_\infty$, for the value of the
symmetry energy at saturation and for its density dependence. By calculating,
in a fully self-consistent fashion, the ISGMR centroid energy in $^{208}$Pb we
reach, for the first time within the non-relativistic framework, three
important conclusions: (i) the monopole energy, and consequently the deduced
value of $K_\infty$, depend on a well defined parameter related to the shape of
the symmetry energy curve and called $K_{sym}$; (ii) Skyrme forces of the type
of SLy4 predict $K_\infty$ around 230 MeV, in agreement with the Gogny force
(previous estimates using Skyrme interactions having been plagued by lack of
full self-consistency); (iii) it is possible to build forces which predict
$K_\infty$ around 250 MeV, although part of this increase is due to our poor
knowledge of the density dependence and effective mass.


title:
Prompt muon-induced fission: a sensitive probe for nuclear energy
  dissipation and fission dynamics

abstract:
  Following the formation of an excited muonic atom, inner shell transitions
may proceed without photon emission by inverse internal conversion, i.e. the
muonic excitation energy is transferred to the nucleus. In actinides, the 2p ->
1s and the 3d -> 1s muonic transitions result in excitation of the nuclear
giant dipole and giant quadrupole resonances, respectively, which act as
doorway states for fission. The nuclear excitation energy is typically 6.5 - 10
MeV. Because the muon lifetime is long compared to the timescale of prompt
nuclear fission, the motion of the muon in the Coulomb field of the fissioning
nucleus may be utilized to learn about the dynamics of fission.


title:
Compton scattering on the proton, neutron, and deuteron in chiral
  perturbation theory to O(Q^4)

abstract:
  We study Compton scattering in systems with A=1 and 2 using chiral
perturbation theory up to fourth order. For the proton we fit the two
undetermined parameters in the O(Q^4) $\gamma$p amplitude of McGovern to
experimental data in the region $\omega,\sqrt{|t|} \leq 180$ MeV, obtaining a
chi^2/d.o.f. of 133/113. This yields a model-independent extraction of proton
polarizabilities based solely on low-energy data: alpha_p=12.1 +/- 1.1 (stat.)
+/- 0.5 (theory) and beta_p=3.4 +/- 1.1 (stat.) +/- 0.1 (theory), both in units
of 10^{-4} fm^3. We also compute Compton scattering on deuterium to O(Q^4). The
$\gamma$d amplitude is a sum of one- and two-nucleon mechanisms, and contains
two undetermined parameters, which are related to the isoscalar nucleon
polarizabilities. We fit data points from three recent $\gamma$d scattering
experiments with a chi^2/d.o.f.=26.6/20, and find alpha_N=13.0 +/- 1.9 (stat.)
+3.9/-1.5 (theory) and a beta_N that is consistent with zero within sizeable
error bars.


title: Production of light antinuclei in heavy ion collisions

abstract:
  The antideuteron and antihelium-3 production rates at high-energy heavy ion
collisions are calculated in the framework of fusion mechanism. It is supposed,
that anti-p,n,d,^3He participating in the fusion are moving in the mean field
of other fireball constituents. It is demonstrated that at high energies, where
many pions are present in the fireball, the number of produced anti-d and ^3He
is determined by the balance between created and desintegrated (mainly in
collisions with pions) anti-d and ^3He. The explicit formulae for coalescence
parameters are presented and compared with the data.


abstract:
  New generation of neutron decay experiments, which can be done with high
accuracy at new Spallation Neutron Sources, are very important for solution of
current problems of fundamental physics and for tests of the Standard Model.
The open problems of theory related to these experiments and possible
approaches to their solutions are discussed.


title:
Neutrino-Nucleus Cross Section Measurements using Stopped Pions and Low
  Energy Beta Beams

abstract:
  Two new facilities have recently been proposed to measure low energy
neutrino-nucleus cross sections, the nu-SNS (Spallation Neutron Source) and low
energy beta beams. The former produces neutrinos by pion decay at rest, while
the latter produces neutrinos from the beta decays of accelerated ions. One of
the uses of neutrino-nucleus cross section measurements is for supernova
studies, where typical neutrino energies are 10s of MeV. In this energy range
there are many different components to the nuclear response and this makes the
theoretical interpretation of the results of such an experiment complex.
Although even one measurement on a heavy nucleus such as lead is much
anticipated, more than one data set would be still better. We suggest that this
can be done by breaking the electron spectrum down into the parts produced in
coincidence with one or two neutrons, running a beta beam at more than one
energy, comparing the spectra produced with pions and a beta beam or any
combination of these.


title:
Competition between isoscalar and isovector pairing correlations in N=Z
  nuclei

abstract:
  We study the isoscalar (T=0) and isovector (T=1) pairing correlations in N=Z
nuclei. They are estimated from the double difference of binding energies for
odd-odd N=Z nuclei and the odd-even mass difference for the neighboring
odd-mass nuclei, respectively. The empirical and BCS calculations based on a
T=0 and T=1 pairing model reproduce well the almost degeneracy of the lowest
T=0 and T=1 states over a wide range of even-even and odd-odd N=Z nuclei. It is
shown that this degeneracy is attributed to competition between the isoscalar
and isovector pairing correlations in N=Z nuclei. The calculations give an
interesting prediction that the odd-odd N=Z nucleus 82Nb has possibly the
ground state with T=0.


title: N-N Interactions in the Extended Chiral SU(3) Quark Model

abstract:
  The chiral SU(3) quark model is extended to include coupling between vector
chiral field and quarks. By using this model, the phase shifts of NN scattering
for different partial waves are studied. The results are very similar to those
of the chiral SU(3) quark model calculation, in which one gluon exchange (OGE)
plays dominate role in the short range part of the quark-quark interactions.
Only in the $^1S_0$ case, the one channel phase shifts of the extended chiral
SU(3) quark model are obviously improved.


title:
Phi-Meson Production at RHIC, Strong Color Fields and Intrinsic
  Transverse Momenta

abstract:
  We investigate the effects of strong color fields and of the associated
enhanced intrinsic transverse momenta on the phi-meson production in
ultrarelativistic heavy ion collisions at RHIC. The observed consequences
include a change of the spectral slopes, varying particle ratios, and also
modified mean transverse momenta. In particular, the composition of the
production processes of phi mesons, that is, direct production vs.
coalescence-like production, depends strongly on the strength of the color
fields and intrinsic transverse momenta and thus represents a sensitive probe
for their measurement.


title: Heavy Quark Radiative Energy Loss - Applications to RHIC

abstract:
  Heavy quark energy loss in a hot QCD plasma is computed taking into account
the competing effects due to suppression of zeroth order gluon radiation bellow
the plasma frequency and the enhancement of gluon radiation due to transition
energy loss and medium induced Bremsstrahlung. Heavy quark medium induced
radiative energy loss is derived to all orders in opacity, $(L/\lambda_g)^n$.
Numerical evaluation of the energy loss suggest small suppression of high
$p_\perp$ charm quarks, and therefore provide a possible explanation for the
null effects observed by PHENIX in the prompt electron spectrum in $Au+Au$ as
$\sqrt{s}=130$ and 200 AGeV.


title: Lifetimes of the $\alpha$ decay chains of superheavy element 115

abstract:
  The lifetimes of the consecutive $\alpha$ decay chains of recently
synthesized new element 115, $^{287}115$ and $^{288}115$, have been calculated
theoretically within the WKB approximation using microscopic $\alpha$-nucleus
interaction potentials obtained by folding in the densities of the $\alpha$ and
the daughter nuclei with a realistic effective interaction. M3Y effective
interaction, supplemented by a zero-range pseudo-potential for exchange along
with the density dependence, has been used for calculating the nuclear
interaction potentials. Spherical charge distributions have been used for
calculating the Coulomb interaction potentials. These calculations provide
consistent estimates for the lifetimes of the consecutive $\alpha$ decay chains
of the superheavy element 115.


title: Relaxation, Emission Modes and Limit Temperatures in Ni+Ni HIC

abstract:
  A dynamical stability analysis is performed for Ni+Ni central collision at
intermediate energies, showing that in chemical, thermal and dynamical
equilibriums are reached at an early stage of system evolution. This is
obtained by computing the relaxation times of the quadrupole momentum, speed of
sound and electric charge density of the system. This way, fragment emission
modes at low and high energies as well as the qualitative behavior of the limit
temperatures are determined.


title: Heavy ion collisions and lattice QCD at finite baryon density

abstract:
  We discuss a relation between the
  QCD thermodynamics obtained from a statistical analysis of particle
production in heavy ion collisions at SPS and RHIC energies and recent LGT
results at finite chemical potential. We show that basic thermodynamic
properties obtained from the phenomenological statistical operator of a hadron
resonance gas that describes particle yields in heavy ion collisions are
consistent with recent LGT results. We argue that for $T\leq T_c$ the equation
of state derived from
  Monte--Carlo simulations of two quark--flavor QCD at finite chemical
potential can be well described by a hadron resonance gas when using the same
set of approximations as used in LGT calculations. We examine the influence of
a finite quark mass on the position of the deconfinement transition in
temperature and chemical potential plane.


title:
Faddeev Calculation of the Hypertriton using the SU_6 Quark-Model
  Nucleon-Nucleon and Hyperon-Nucleon Interactions

abstract:
  Quark-model nucleon-nucleon and hyperon-nucleon interactions by the Kyoto-
Niigata group are applied to the hypertriton calculation in a new three-cluster
Faddeev formalism using the two-cluster resonating-group method kernels. The
most recent model, fss2, gives a reasonable result similar to the Nijmegen
soft-core model NSC89, except for an appreciable contributions of higher
partial waves.


title:
Magnetic moments and electromagnetic radii of nucleon and $\Delta(1232)$
  in an extended GBE model

abstract:
  We derive the exchange currents of pseudoscalar, vector, and scalar mesons
from Feynman diagrams, and use them to calculate the magnetic form factors of
nucleon and $\Delta(1232)$. The magnetic moments and electromagnetic radii are
obtained by using those form factors and the parameters determined from the
masses of nucleon and $\Delta(1232)$. We find the magnetic moments and
electromagnetic radii of nucleon and $\Delta(1232)$ can be produced very well
in the extended Goldstone-boson-exchange model (GBE) in which all of
pseudoscalar, vector and scalar meson nonet are included. The magnetic moments
of $\Delta(1232)$ are closer to experiment values and results from lattice
calculation than the results obtained by the model without other mesons except
for pion and sigma.


title: Cronin Effect at Different Rapidities at RHIC

abstract:
  Calculations of the nuclear modification factor, R_dAu, for pi^0 production
in dAu collisions at s_NN^1/2 = 200 GeV are presented. The applied
pQCD-improved parton model incorporates intrinsic k_T. Nuclear multiscattering
and nuclear shadowing are considered in the Au nucleus. Theoretical results are
displayed for midrapidity and high pseudorapidity (eta), and compared to
preliminary PHENIX and BRAHMS data.


title: Bremsstrahlung in alpha-decay: angular analysis of spectra

abstract:
  A quantum mechanical method of calculation of bremsstrahlung spectra in
alpha-decay of heavy nuclei with taking into account an angle between
directions of the alpha-particle motion and the photon emission is presented.
Dependence between the bremsstrahlung spectrum and the angle value is obtained
in a simple analytical form. The method can be used for a comparative analysis
of experimental data, obtained at different angles.


title: Generalized Parton Distributions of ^3He

abstract:
  A realistic microscopic calculation of the unpolarized quark Generalized
Parton Distribution (GPD) $H_q^3$ of the $^3He$ nucleus is presented. In
Impulse Approximation, $H_q^3$ is obtained as a convolution between the GPD of
the internal nucleon and the non-diagonal spectral function, describing
properly Fermi motion and binding effects. The proposed scheme is valid at low
values of $\Delta^2$, the momentum transfer to the target, the most relevant
kinematical region for the coherent channel of hard exclusive processes. The
obtained formula has the correct forward limit, corresponding to the standard
deep inelastic nuclear parton distributions, and first moment, giving the
charge form factor of $^3He$. Nuclear effects, evaluated by a modern realistic
potential, are found to be larger than in the forward case. In particular, they
increase with increasing the momentum transfer when the asymmetry of the
process is kept fixed, and they increase with the asymmetry at fixed momentum
transfer. Another relevant feature of the obtained results is that the nuclear
GPD cannot be factorized into a $\Delta^2$-dependent and a
$\Delta^2$-independent term, as suggested in prescriptions proposed for finite
nuclei. The size of nuclear effects reaches 8 % even in the most important part
of the kinematical range under scrutiny. The relevance of the obtained results
to study the feasibility of experiments is addressed.


title: Hadronic signals of deconfinement at RHIC

abstract:
  This article reviews (soft) hadronic signals of deconfinement and chiral
symmetry restoration in hot QCD matter in the light of the results from the
first three years of the experimental program at the Relativistic Heavy Ion
Collider.


title:
Three-alpha-cluster structure of the 0^+ states in ^{12}C and the
  effective alpha-alpha interactions

abstract:
  The $0^{+}$ states of $^{12}\mathrm{C}$ are considered within the framework
of the microscopic three-$\alpha$-cluster model. The main attention is paid to
accurate calculation of the width of the extremely narrow near-threshold
$0^+_2$ state which plays a key role in stellar nucleosynthesis. It is shown
that the $0^{+}_2$-state decays by means of the sequential mechanism
${^{12}\mathrm{C}} \to \alpha+{^8\mathrm{Be}} \to 3\alpha$. Calculations are
performed for a number of effective $\alpha - \alpha$ potentials which are
chosen to reproduce both energy and width of $^8\mathrm{Be}$. The parameters of
the additional three-body potential are chosen to fix both the ground and
excited state energies at the experimental values. The dependence of the width
on the parameters of the effective $\alpha - \alpha$ potential is studied in
order to impose restrictions on the potentials.


abstract:
  Recent developments in weak-coupling color superconductivity are reviewed.
These developments are as follows. The mean field gap equation is solved for
most common superconducting phases up to subleading order; BCS relation is
found to be violated in color-flavor-locking and color-spin-locking phases due
to the two-gaps structure of the order parameter; The Debye and Meissner masses
of gluons and photon with their rotated partners are calculated for these
phases; We found that there is no electromagnetic Meissner effect in spin-one
color superconductor; A proof of gauge parameter independence at subleading
order is given in covariant gauge.


title:
Analysis of the GSI A+p and A+A Spallation, Fission, and Fragmentation
  Measurements with the LANL CEM2k and LAQGSM codes

abstract:
  The CEM2k and LAQGSM codes have been recently developed at Los Alamos
National Laboratory to simulate nuclear reactions induced by particles and
nuclei for a number of applications. We have benchmarked our codes against most
available measured data at projectile energies from 10 MeV/A to 800 GeV/A and
have compared our results with predictions of other current models used by the
nuclear community. Here, we present a brief description of our codes and show
illustrative results obtained with CEM2k and LAQGSM for A+p and A+A spallation,
fission, and fragmentation reactions measured recently at GSI compared with
predictions by other models. Further necessary work is outlined.


title: Correlation energy contribution to nuclear masses

abstract:
  The ground state correlation energies associated with collective surface and
pairing vibrations are calculated for Pb- and Ca-isotopes. It is shown that
this contribution, when added to those predicted by one of the most accurate
modern nuclear mass formula (HFBCS MSk7 mass formula), reduces the associated
rms error by an important factor, making mean field theory, once its time
dependence is taken into account, a quantitative predictive tool for nuclear
masses.


title: Mass splittings of nuclear isotopes in chiral soliton approach

abstract:
  The differences of the masses of nuclear isotopes with atomic numbers between
\~10 and ~30 can be described within the chiral soliton approach in
satisfactory agreement with data. Rescaling of the model is necessary for this
purpose - decrease of the Skyrme constant by about 30%, providing the "nuclear
variant" of the model. The asymmetric term in Weizsaecker-Bethe- Bacher mass
formula for nuclei can be obtained as the isospin dependent quantum correction
to the nucleus energy. Some predictions for the binding energies of neutron
rich nuclides are made in this way, from, e.g. Be-16 and B-19 to Ne-31 and
Na-32. Neutron rich nuclides with high values of isospin are unstable relative
to strong interactions. The SK4 (Skyrme) variant of the model, as well as SK6
variant (6-th order term in chiral derivatives in the lagrangian as solitons
stabilizer) are considered, and the rational map approximation is used to
describe multiskyrmions.


title: Simple function forms and nucleon-nucleus total cross sections

abstract:
  Total cross sections for neutron scattering with energies between 10 and 600
MeV and from nine nuclei spanning the mass range from 6Li to 238U have been
analyzed using a simple function of three parameters. The values of those
parameters with which neutron total cross section data are replicated vary
smoothly with energy and target mass and may themselves be represented by
functions of energy and mass.


title:
Distribution of spectral widths and preponderance of spin-0 ground
  states in nuclei

abstract:
  We use a single j-shell model with random two-body interactions to derive
closed expressions for the distribution of and the correlations between
spectral widths of different spins. This task is facilitated by introducing
two-body operators whose squared spectral widths sum up to the squared spectral
width of the random Hamiltonian. The spin-0 width is characterized by a
relatively large average value and small fluctuations while the width of
maximum spin has the largest average and the largest fluctuations. The
approximate proportionality between widths and spectral radii explains the
preponderance of spin-0 ground states.


title: Study of a possible S=+1 dynamically generated baryonic resonance

abstract:
  Starting from the lowest order chiral Lagrangian for the interaction of the
baryon decuplet with the octet of pseudoscalar mesons we find an attractive
interaction in the $\Delta K$ channel with L=0 and I=1, while the interaction
is repulsive for I=2. The attractive interaction leads to a pole in the second
Riemann sheet of the complex plane and manifests itself in a large strength of
the $\Delta K$ scattering amplitude close to the $\Delta K$ threshold, which is
not the case for I=2. However, we also make a study of uncertainties in the
model and conclude that the existence of this pole depends sensitively upon the
input used and can disappear within reasonable variations of the input
parameters. We take advantage to study the stability of the other poles
obtained for the ${3/2}^-$ dynamically generated resonances of the model and
conclude that they are stable and not contingent to reasonable changes in the
input of the theory.


title:
Nucleon pole contributions in $J/\psi\to N \bar{N} \pi$, $p \bar{p}
  \eta$, $p \bar{p} \eta^{\prime}$ and $p \bar{p} \omega$ decays

abstract:
  Nucleon pole contributions in $J/\psi \to N \bar N \pi$, $p \bar p \eta$, $p
\bar p \eta^{\prime}$ and $p \bar{p} \omega$ decays are re-studied. Different
contributions due to PS-PS and PS-PV couplings in the $\pi$-N interaction and
the effects of $NN\pi$ form factors are investigated in the $J/\psi \to N \bar
N \pi$ decay channel. It is found that when the ratio of $|F_0| /|F_M|$ takes
small value, without considering the $NN\pi$ form factor, the difference
between PS-PS and PS-PV couplings are negligible. However, when the $NN\pi$
form factor is included, this difference is greatly enlarged. The resultant
decay widths are sensitive to the form factors. As a conclusion, the
nucleon-pole contribution as a background is important in the $J/\psi\to
N\bar{N}\pi$ decay and must be accounted. In the $J/\psi\to N\bar{N}\eta$ and
$N\bar{N}\eta'$ decays, its contribution is less than 0.1% of the data. In the
$J/\psi\to N\bar{N}\omega$ decay, it provides rather important contribution
without considering form factors. But the contribution is suppressed greatly
when adding the off-shell form factors. Comparing these results with data would
help us to select a proper form factor for such kind of decay.


title:
Comparisons of Model Predictions of Pion Electrioproduction Amplitudes
  in the low $Q^2$ Region

abstract:
  Pion electroproduction amplitudes predicted by three theoretical models in
the $Q^2 \leq 0.5$ (GeV/c)$^2$ region are compared. The objective is to
facilitate the analyses of the data from new experiments on investigating the
pion cloud effects on the $\gamma N \to \Delta$ transition form factors.


title: Antibaryons bound in nuclei

abstract:
  We study the possibility of producing a new kind of nuclear systems which in
addition to ordinary nucleons contain a few antibaryons (antiproton,
antilambda, etc.). The properties of such systems are described within the
relativistic mean-field model by employing G-parity transformed interactions
for antibaryons. Calculations are first done for infinite systems and then for
finite nuclei from He to Pb. It is demonstrated that the presence of a real
antibaryon leads to a strong rearrangement of a target nucleus resulting in a
significant increase of its binding energy and local compression. Noticeable
effects remain even after the antibaryon coupling constants are reduced by
factor 3-4 compared to G-parity motivated values. We have performed detailed
calculations of the antibaryon annihilation rates in the nuclear environment by
applying a kinetic approach. It is shown that due to significant reduction of
the reaction Q-values, the in-medium annihilation rates should be strongly
suppressed leading to relatively long-lived antibaryon-nucleus systems.
Multi-nucleon annihilation channels are analyzed too. We have also estimated
formation probabilities of bound antibaryon-nucleus systems in
antiproton-nucleus reactions and have found that their observation will be
feasible at the future GSI antiproton facility. Several observable signatures
are proposed. The possibility of producing multi-quark-antiquark clusters is
discussed.


title:
Astrophysical weak-interaction processes and nuclear effective field
  theory

abstract:
  Low-energy nuclear weak-interaction processes play important roles in many
astrophysical contexts, and effective field theory is believed to be a highly
useful framework for describing these processes in a model-independent manner.
I present a brief account of the basic features of the nuclear effective theory
approach, and some examples of actual calculations carried out in this method.


title: Effective Interactions for the Three-Body Problem

abstract:
  The three-body energy-dependent effective interaction given by the
Bloch-Horowitz (BH) equation is evaluated for various shell-model oscillator
spaces. The results are applied to the test case of the three-body problem
(triton and He3), where it is shown that the interaction reproduces the exact
binding energy, regardless of the parameterization (number of oscillator quanta
or value of the oscillator parameter b) of the low-energy included space. We
demonstrate a non-perturbative technique for summing the excluded-space
three-body ladder diagrams, but also show that accurate results can be obtained
perturbatively by iterating the two-body ladders. We examine the evolution of
the effective two-body and induced three-body terms as b and the size of the
included space Lambda are varied, including the case of a single included
shell, Lambda hw=0 hw. For typical ranges of b, the induced effective
three-body interaction, essential for giving the exact three-body binding, is
found to contribute ~10% to the binding energy.


title: Complex fission phenomena

abstract:
  Complex fission phenomena are studied in a unified way. Very general
reflection asymmetrical equilibrium (saddle point) nuclear shapes are obtained
by solving an integro-differential equation without being necessary to specify
a certain parametrization. The mass asymmetry in binary cold fission of Th and
U isotopes is explained as the result of adding a phenomenological shell
correction to the liquid drop model deformation energy. Applications to binary,
ternary, and quaternary fission are outlined.


title: Collective excitations induced by pairing anti-halo effect

abstract:
  Important features of low-frequency collective vibrational excitations in
neutron drip line nuclei are studied. We emphasize that pairing anti-halo
effect in the Hartree-Fock-Bogoliubov (HFB) theory play crucial roles to
realize collective motions in loosely bound nuclei. We study the spatial
properties of one particle - one hole (1p-1h) states with/without
selfconsistent pairing correlations by solving simplified HF(B) equations in
coordinate space. Next, by performing Skyrme-HFB plus selfconsistent
quasiparticle random phase approximation (QRPA) we investigate the first 2+
states in neutron rich Ni isotopes. Three types of calculations, HFB plus QRPA,
resonant BCS plus QRPA, and RPA are compared.


title: Study of $\Lambda(1405)$ in photoproduction of $K^*$

abstract:
  We investigate the photoproduction of $K^*$ vector meson for the study of the
$\Lambda(1405)$ resonance. The invariant mass distribution of $\pi\Sigma$ shows
a different shape from the nominal one, peaking at 1420 MeV. This is considered
as a consequence of the double pole structure of $\Lambda(1405)$, predicted in
the chiral unitary model. Combined with other reactions, such as $\pi^- p \to
K^0 \pi\Sigma$, experimental confirmation of this fact will reveal a novel
structure of the $\Lambda(1405)$ state.


title:
Many-Particle and Many-Hole States in Neutron-Rich Ne Isotopes Related
  to Broken N=20 Shell Closure

abstract:
  The low-lying level structures of $^{26}{\rm Ne}$, $^{28}{\rm Ne}$ and
$^{30}{\rm Ne}$ which are related to the breaking of the N=20 shell closure
have been studied by the framework of the deformed-basis antisymmetrized
molecular dynamics plus generator coordinate method using Gogny D1S force. The
properties of the many-particle and many-hole states are discussed as well as
that of the ground band. We predict that the negative-parity states in which
neutrons are promoted into $pf$-orbit from $sd$ orbit have the small excitation
energy in the cases of $^{28}{\rm Ne}$ and $^{30}{\rm Ne}$ which, we regard, is
a typical phenomena accompanying the breaking of N=20 shell closure. It is also
found that the neutron $4p4h$ structure of $^{30}{\rm Ne}$ appears in low
excitation energy which contains $\alpha + ^{16}{\rm O}$ correlations.


title:
Coexistence of cluster structure and superdeformation in $^{44}$Ti
  studied with deformed-basis antisymmetrized molecular dynamics

abstract:
  The nucleus $^{44}$Ti has low-lying levels of various kinds of mutually very
different nuclear structure displaying the richness of the nuclear many-body
dynamics. It is shown that the deformed-basis antisymmetrized molecular
dynamics by the use of the Gogny D1S force reproduces successfully and
unifiedly two types of coexistence phenomena in $^{44}$Ti. Namely, on one hand,
the coexistence of the mean field structure and the cluster structure is
confirmed by verifying the normally deformed structure of the $K^\pi$=$3^-_1$
band with a 1-particle-jump intrinsic configuration and the $\alpha + ^{40}$Ca
cluster structure of the $K^\pi$=$0^-_2$ band. The mixed character of the
mean-field-like structure and the $\alpha + ^{40}$Ca cluster structure of the
ground band is also shown. On the other hand, the coexistence of the normal
deformed mean field and the superdeformed mean field is confirmed by verifying
the triaxial superdeformation of the $K^\pi$=$0_2^+$ band and the
$K^\pi$=$2^+_1$ band which has a 4-particle-jump intrinsic configuration. Good
reproduction of the experimental data is shown for many kinds of quantities
including the energy spectra, electric transition rates, alpha spectroscopic
factors. Preliminary discussions are given on the existence of hyperdeformed
excited states, the relation between superdeformation and clustering and so on.


title: Color screening in a constituent quark model of hadronic matter

abstract:
  The effect of color screening on the formation of a heavy quark-antiquark
($Q\bar{Q}$) bound state--such as the $J/\psi$ meson--is studied using a
constituent-quark model. The response of the nuclear medium to the addition of
two color charges is simulated directly in terms of its quark constituents via
a string-flip potential that allows for quark confinement within hadrons yet
enables the hadrons to separate without generating unphysical long-range
forces. Medium modifications to the properties of the heavy meson, such as its
energy and its mean-square radius, are extracted by solving Schr\"odinger's
equation for the $Q\bar{Q}$ pair in the presence of a (screened)
density-dependent potential. The density dependence of the heavy-quark
potential is in qualitative agreement with earlier studies of its temperature
dependence extracted from lattice calculations at finite temperature. In the
present model it is confirmed that abrupt changes in the properties of the
$J/\psi$-meson in the hadronic medium ({\it plasma}), correlate strongly with
the deconfining phase transition.


title: The effect of different baryons impurities

abstract:
  We demonstrate the different effect of different baryons impurities on the
static properties of nuclei within the framework of the relativistic mean-field
model. Systematic calculations show that $\Lambda_c^+$ and $\Lambda_b$ has the
same attracting role as $\Lambda$ hyperon does in lighter hypernuclei. $\Xi^-$
and $\Xi_c^0$ hyperon has the attracting role only for the protons
distribution, and has a repulsive role for the neutrons distribution. On the
contrary, $\Xi^0$ and $\Xi^+_c$ hyperon attracts surrounding neutrons and
reveals a repulsive force to the protons. We find that the different effect of
different baryons impurities on the nuclear core is due to the different third
component of their isospin.


title:
Characteristic Feature of Self-Consistent Mean-Field in Level Crossing
  Region

abstract:
  A shape change of the self-consistent mean-field induced by a configuration
change is discussed within the conventional constrained Hartree-Fock (CHF)
theory. It is stressed that a single-particle level crossing dynamics should be
treated carefully, because the shape of the mean-field in such a finite
many-body system as the nucleus strongly changes depending on its
configuration. This situation is clearly shown by applying an adiabatic
assumption, where the most energetically favorable single-particle states are
assumed to be occupied. The excited HF states and the continuously-connected
potential energy curves are given by applying the configuration dictated CHF
method. The effect of pairing correlation is discussed in the level crossing
region. Triaxial deformed results in our Hartree-Fock-Bogoliubov (HFB)
calculation with Gogny force nicely reproduce the available experimental data
of Ge isotopes. From our numerical calculation, it is concluded that the CHFB
state is more fragile than the CHF state in the level crossing region.


title: Corrections to the Nuclear Axial Vector Coupling in a Nuclear Medium

abstract:
  We examine further corrections to the time component of the axial vector
coupling constant in a nuclear medium. The dominant correction is that of
exchange currents. The corrections we examine make the remaining discrepancy
worse.


title:
Study of deuteron-proton charge exchange reaction at small transfer
  momentum

abstract:
  The charge-exchange reaction pd->npp at 1 GeV projectile proton energy is
studied in the multiple-scattering expansion technique. This reaction is
considered in a special kinematics, when the transfer momentum from the beam
proton to fast neutron is close to zero. The differential cross section and a
set of polarization observables are calculated. It was shown that contribution
of the final state interaction between two protons is very significant.


title:
Hydrodynamic afterburner for the Color Glass Condensate and the parton
  energy loss

abstract:
  We take hydrodynamic initial conditions in relativistic heavy ion collisions
from the Color Glass Condensate (CGC) picture through the kT factorization
formula. Gluon distributions produced from the CGC are found to provide good
initial conditions for the hydrodynamic simulations in Au + Au collisions at
Relativistic Heavy Ion Collider (RHIC) energies. We reproduce the centrality,
rapidity, and energy dependences of multiplicity within this approach. We also
investigate the energy loss of high pT partons in the dense thermalized medium
created from colliding two CGC's. We find that our results on the centrality
dependence of nuclear modification factors for pions and back-to-back
correlation for charged hadrons at midrapidity are consistent with the RHIC
data up to semicentral events. Whereas, our approach in which jets are
calculated from perturbative QCD 2->2 processes predicts less suppression at
forward rapidity region compared to the BRAHMS data in Au+Au collisions at
RHIC.


title:
Constraining the neutron-proton effective mass splitting in neutron-rich
  matter

abstract:
  Within Bombaci's phenomenological single-nucleon potential model we study the
neutron-proton effective mass splitting $m_n^*- m_p^*$ in neutron-rich matter.
It is shown that an effective mass splitting of $m_n^*<m_p^*$ leads to a
symmetry potential that is inconsistent with the energy dependence of the Lane
potential constrained by the nucleon-nucleus scattering experimental data.


title:
Patterns of the ground states in the presence of random interactions:
  nucleon systems

abstract:
  We present our results on properties of ground states for nucleonic systems
in the presence of random two-body interactions. In particular we present
probability distributions for parity, seniority, spectroscopic (i.e., in the
laboratory framework) quadrupole moments and $\alpha$ clustering in the ground
states. We find that the probability distribution for the parity of the ground
states obtained by a two-body random ensemble simulates that of realistic
nuclei: positive parity is dominant in the ground states of even-even nuclei
while for odd-odd nuclei and odd-mass nuclei we obtain with almost equal
probability ground states with positive and negative parity. In addition we
find that for the ground states, assuming pure random interactions, low
seniority is not favored, no dominance of positive values of spectroscopic
quadrupole deformation, and no sign of $\alpha$-cluster correlations, all in
sharp contrast to realistic nuclei. Considering a mixture of a random and a
realistic interaction, we observe a second order phase transition for the
$\alpha$-cluster correlation probability.


title:
Classification of states of single-$j$ fermions with $J$-pairing
  interaction

abstract:
  In this paper we show that a system of three fermions is exactly solvable for
the case of a single-$j$ in the presence of an angular momentum-$J$ pairing
interaction. On the basis of the solutions for this system, we obtain new sum
rules for six-$j$ symbols. It is also found that the "non-integer" eigenvalues
of three fermions with angular momentum $I$ around the maximum appear as
"non-integer" eigenvalues of four fermions when $I$ is around (or larger than)
$J_{\rm max}$ and the Hamiltonian contains only an interaction between pairs of
fermions coupled to spin $J=J_{\rm max}=2j-1$. This pattern is also found in
five and six fermion systems. A boson system with spin $l$ exhibits a similar
pattern.


title:
Many-particle many-hole states near the magic number 20: deformed and
  superdeformed states

abstract:
  Many-particle many-hole states near the magic number 20 have been
investigated in the relativistic mean field formalism using the fixed
configuration method. Neutron particle-hole states in neutron-rich nuclei with
$N\sim 20$, {\em i.e.} $^{30,32,34}$Mg,and $^{28,30}$Ne are studied to find out
the ground state configuration. The ground state of $^{32}$Ne,Mg as well as
possibly $^{34}$Mg comes out actually as particle-hole states. Proton-neutron
excitation across the shell gap at 20 in nuclei with $N=Z$, {\em i.e.}
$^{32}$S, $^{36}$Ar, $^{40}$Ca and $^{44}$Ti is investigated as possible
origins of superdeformed configuration. Observed superdeformed bands in
$^{36}$Ar and $^{40}$Ca can be described as many-particle many-hole states.


title:
The generalized Gerasimov-Drell-Hearn sum rule for deuteron
  electrodisintegration

abstract:
  The generalized Gerasimov-Drell-Hearn sum rule $I^{GDH}_{\gamma^*d}(Q^2)$ for
deuteron electrodisintegration $d(e,e')np$ as function of the squared
four-momentum transfer $Q^2$ is evaluated by explicit integration. The
calculation is based on a conventional nonrelativistic framework using a
realistic $NN$-potential and including contributions from meson exchange
currents, isobar configurations and leading order relativistic terms. Good
convergence is achieved. The prominent feature is a deep negative minimum,
$I_{\gamma^* d}^{GDH}=-9.5$ mb, at low $Q^2\approx 0.2$ fm$^{-2}$ which is
almost exclusively driven by the nucleon isovector anomalous magnetic moment
contribution to the magnetic dipole transition to the $^1S_0$-state. Above
$Q^2=20$ fm$^{-2}$ the integral $I^{GDH}_{\gamma^*}(Q^2)$ approaches zero
rapidly.


title:
High-lying single-particle modes, chaos, correlational entropy, and
  doubling phase transition

abstract:
  Highly-excited single-particle states in nuclei are coupled with the
excitations of a more complex character, first of all with collective
phonon-like modes of the core. In the framework of the quasiparticle-phonon
model we consider the structure of resulting complex configurations using the
$1k_{17/2}$ orbital in $^{209}$Pb as an example. Although, on the level of one-
and two-phonon admixtures, the fully chaotic GOE regime is not reached, the
eigenstates of the model carry significant degree of complexity that can be
quantified with the aid of correlational invariant entropy. With artificially
enhanced particle-core coupling, the system undergoes the doubling phase
transition with the quasiparticle strength concentrated in two repelling peaks.
This phase transition is clearly detected by correlational entropy.


title: Analytical relationship for the cranking inertia

abstract:
  The wave function of a spheroidal harmonic oscillator without spin-orbit
interaction is expressed in terms of associated Laguerre and Hermite
polynomials. The pairing gap and Fermi energy are found by solving the BCS
system of two equations. Analytical relationships for the matrix elements of
inertia are obtained function of the main quantum numbers and potential
derivative. They may be used to test complex computer codes one should develop
in a realistic approach of the fission dynamics. The results given for the
$^{240}$Pu nucleus are compared with a hydrodynamical model. The importance of
taking into account the correction term due to the variation of the occupation
number is stressed.


title:
Pion Interferometry for Hydrodynamical Expanding Source with a Finite
  Baryon Density

abstract:
  We calculate the two-pion correlation function for an expanding hadron source
with a finite baryon density. The space-time evolution of the source is
described by relativistic hydrodynamics and the Hanbury-Brown-Twiss (HBT)
radius is extracted after effects of collective expansion and multiple
scattering on the HBT interferometry have been taken into account, using
quantum probability amplitudes in a path-integral formalism. We find that this
radius is substantially smaller than the HBT radius extracted from the
freeze-out configuration.


title: Traces of Thermalization at RHIC

abstract:
  I argue that measurements of Au+Au collisions at 20, 130 and 200 GeV of the
centrality dependence of the mean p_t together with p_t and net-charge
fluctuations reflect the approach to local thermal equilibrium.


title:
Low-momentum nucleon-nucleon interaction and its application to the
  few-nucleon systems

abstract:
  Low-momentum nucleon-nucleon interactions are derived within the framework of
a unitary-transformation theory, starting with realistic nucleon-nucleon
interactions. A cutoff momentum Lambda is introduced to specify a border
between the low- and high-momentum spaces. By the Faddeev-Yakubovsky
calculations the low-momentum interactions are investigated with respect to the
dependence of ground-state energies of ^3H and ^4He on the parameter Lambda. It
is found that we need the momentum cutoff parameter Lambda >= 5 fm^-1 in order
to reproduce satisfactorily the exact values of the binding energies for ^3H
and ^4He. The calculation with Lambda =2 fm^-1 recommended by Bogner et al.
leads to considerable overbinding at least for the few-nucleon systems.


title: Intensity interferometry of direct photons emitted in Au+Au collisions

abstract:
  We calculate the two-body correlation function of direct photons produced in
Au+Au collisions at the Relativistic Heavy Ion Collider. Our calculation
includes contributions from the early pre-equilibrium phase in which photons
are produced via hard parton scatterings as well as radiation of photons from a
thermalized Quark-Gluon-Plasma (QGP) and the subsequent expanding hadron gas.
We find that high energy photon intensity interferometry provides a faithful
probe of the details of the space-time evolution and of the early reaction
stages of the system.


title: Alpha Decay Hindrance Factors: A Probe of Mean Field Wave Functions

abstract:
  A simple model to calculate alpha-decay Hindrance Factors is presented. Using
deformation values obtained from PES calculations as the only input, Hindrance
Factors for the alpha-decay of Rn- and Po-isotopes are calculated. It is found
that the intrinsic structure around the Fermi surface determined by the
deformed mean field plays an important role in determining the hindrance of
alpha-decay. The fair agreement between experimental and theoretical Hindrance
Factors suggest that the wave function obtained from the energy minima of the
PES calculations contains an important part of the correlations that play a
role for the alpha-decay. The calculated HF that emerges from these
calculations render a different interpretation than the commonly assumed
n-particle n-hole picture.


title: Jet quenching at intermediate RHIC energies

abstract:
  The final state energy loss of fast partons penetrating a longitudinally
expanding quark-gluon plasma of effective gluon rapidity density
$dN^{g}/dy=650-800$ is evaluated and incorporated together with the multiple
initial state Cronin scattering in the lowest order perturbative QCD hadron
production formalism. Predictions for the neutral pion attenuation in central
$Au+Au$ collisions at the intermediate RHIC energy of $\sqrt{s_{NN}}=62$ GeV
relative to the binary collision scaled $p+p$ result are given. The quenching
is found to be a factor of 2-3 with a moderate transverse momentum dependence
and the attenuation of the away-side di-hadron correlation function is
estimated to be 3-5 fold.


title:
Potential relations for nonrelativistic and relativistic two-body
  Schroedinger equations

abstract:
  Relations between nonrelativistic and relativistic two-body equations, also
allowing for different masses, are studied and explicit expressions are given.
One example is the Blankenbeclar Sugar equation. The corresponding expressions
for the boosted two-body potentials are provided.


title: Cavitation and bubble collapse in hot asymmetric nuclear matter

abstract:
  The dynamics of embryonic bubbles in overheated, viscous and non-Markovian
nuclear matter is studied. It is shown that the memory and the Fermi surface
distortions significantly affect the hinderance of bubble collapse and
determine a characteristic oscillations of the bubble radius. These
oscillations occur due to the additional elastic force induced by the memory
integral.


title: Isotopic dependence of the pygmy dipole resonance

abstract:
  The isotopic dependence of the excitation energies of the pygmy dipole
resonance (PDR) is analyzed in the framework of the self-consistent
relativistic Hartree-Bogoliubov (RHB) model and the relativistic quasiparticle
random-phase approximation (RQRPA). The DD-ME1 density-dependent meson-exchange
interaction is used in the effective mean-field Lagrangian, and pairing
correlations are described by the pairing part of the finite-range Gogny
interaction D1S. Model calculations reproduce available experimental data on
charge radii, the neutron skin, neutron separation energies, and excitation
energies of isovector giant dipole resonances in Ni, Sn and Pb nuclei. In all
three isotopic chains the one-neutron separation energies decrease with mass
number much faster than the excitation energies of the PDR. As a result,
already at moderate proton-neutron asymmetry the PDR peak energy is calculated
above the neutron emission threshold. This result has important implications
for the observation of the PDR in (gamma,gamma') experiments.


title: Particle Number Fluctuations in Canonical Ensemble

abstract:
  Fluctuations of charged particle number are studied in the canonical
ensemble. In the infinite volume limit the fluctuations in the canonical
ensemble are different from the fluctuations in the grand canonical one. Thus,
the well-known equivalence of both ensembles for the average quantities does
not extend for the fluctuations. In view of a possible relevance of the results
for the analysis of fluctuations in nuclear collisions at high energies, a role
of the limited kinematical acceptance is studied.


title: Properties of the $\omega$ Meson at Finite Temperature and Density

abstract:
  The mass shift, width broadening, and spectral density for the $\omega$ meson
in a heat bath of nucleons and pions is calculated using a general formula
which relates the self-energy to the forward scattering amplitude. We use
experimental data to saturate the scattering amplitude at low energies with
resonances and include a background Pomeron term, while at high energies a
Regge parameterization is used. The peak of the spectral density is little
shifted from its vacuum position, but the width is considerably increased due
to collisional broadening. At normal nuclear matter density and a temperature
of 150 MeV the spectral density of the $\omega$ meson has a width of 140 MeV.
Zero temperature nuclear matter is also discussed.


title:
Causal Diffusion and the Survival of Charge Fluctuations in Nuclear
  Collisions

abstract:
  Diffusion may obliterate fluctuation signals of the QCD phase transition in
nuclear collisions at SPS and RHIC energies. We propose a hyperbolic diffusion
equation to study the dissipation of net charge fluctuations. This equation is
needed in a relativistic context, because the classic parabolic diffusion
equation violates causality. We find that causality substantially limits the
extent to which diffusion can dissipate these fluctuations.


title: Analysis of three-neutrino oscillations in the full mixing angle space

abstract:
  We use a model, with no CP violation, of the world's neutrino oscillation
data, excluding the LSND experiments, and search the full parameter space
($0\leq\theta_{12} \le \pi/2$; $-\pi/2 \le \theta_{13} \le \pi/2$; and
0\leq\theta_{23} \le \pi /2$) for the best fit values of the mixing angles and
mass-squared differences. We find that the mixing angle $\theta_{13}$ is
bounded by $-0.15<\theta_{13}<0.20$ with an absolute minimum at
$\theta_{13}=0.12$ and a local minimum at $-0.04$. The importance of the
negative $\theta_{13}$ region and this structure in the chi-square space has
heretofore been overlooked because the factorization approximation commonly
employed yields oscillation probabilities that are a function of
$\sin^2\theta_{13}$.


title: Quark coalescence into opposite parity baryon states

abstract:
  The production rate of negative parity baryons was found to be much weaker
than that of positive states in RHIC experiments. In the present paper we show
that this suppression is a simple consequence of the coalescence dynamics of
hadronization.


title: Effect of exotic S=+1 resonances on $K^0_L p$ scattering data

abstract:
  We consider the effect of an exotic S=+1 $\Theta^+$ resonance on the
scattering of neutral kaons off protons. Explicit results are presented for the
$K^0_L p$ total cross sections.


title: Dynamical coupled-channel model of kaon-hyperon interactions

abstract:
  The pi N --> KY and KY --> KY reactions are studied using a dynamical
coupled-channel model of meson-baryon interactions at energies where the baryon
resonances are strongly excited. The channels included are: pi N, K \Lambda,
and K\Sigma. The resonances considered are: N^* [S_{11}(1650), P_{11}(1710),
P_{13}(1720),D_{13}(1700)]; \Delta^* [S_{31}(1900), P_{31}(1910),
P_{33}(1920)]; \Lambda ^* [S_{01}(1670), P_{01}(1810)] \Sigma^* [P_{11}(1660),
D_{13}(1670)]; and K^*(892). The basic non-resonant \pi N --> KY and KY --> KY
transition potentials are derived from effective Lagrangians using a unitary
transformation method. The dynamical coupled-channel equations are simplified
by parametrizing the pi N -->pi N amplitudes in terms of empirical pi N
partial-wave amplitudes and a phenomenological off-shell function. Two models
have been constructed. Model A is built by fixing all coupling constants and
resonance parameters using SU(3) symmetry, the Particle Data Group values, and
results from a constituent quark model. Model B is obtained by allowing most of
the parameters to vary around the values of model A in fitting the data. Good
fits to the available data for pi^- p to K^0 \Lambda, K^0 \Sigma^0 have been
achieved. The investigated kinematics region in the center-of-mass frame goes
from threshold to 2.5 GeV. The constructed models can be imbedded into
associated dynamical coupled-channel studies of kaon photo- and
electro-production reactions.


title: Microscopic Study of Wobbling Motions in Hf and Lu Nuclei

abstract:
  One of the most striking findings in the recent high-spin spectroscopy is the
discovery of one-phonon, and possibly double-phonon, excitation of the nuclear
wobbling rotational bands. In this talk, we first review the properties of
observed wobbling motions, and discuss the failure and success of the possible
interpretation in terms of the simple rotor model. Then, we further present
results of our microscopic study in Hf and Lu nuclei by means of the
theoretical framework, the cranked mean-field and the random phase
approximation.


title:
Properties of D-mesons in nuclear matter within a self-consistent
  coupled-channel approach

abstract:
  The spectral density of the $D$-meson in the nuclear environment is studied
within a self-consistent coupled-channel approach assuming a separable
potential for the bare meson-baryon interaction. The $DN$ interaction,
described through a G-matrix, generates dynamically the $\Lambda_c$ (2593)
resonance. This resonance is the charm counterpart of the $\Lambda$ (1405)
resonance generated from the s-wave $\bar{K}N$ interaction in the I=0 channel.
The medium modification of the D-meson spectral density due to the Pauli
blocking of intermediate states as well as due to the dressing of the D-mesons,
nucleons and pions is investigated. We observe that the inclusion of
coupled-channel effects and the self-consistent dressing of the $D$-meson
results in an overall reduction of the in-medium $D$-meson changes compared to
previous work which neglect those effects.


title: Dissipation and elliptic flow at RHIC

abstract:
  We compare elliptic flow evolution from ideal hydrodynamics and covariant
parton transport theory, and show that, for conditions expected at RHIC,
dissipation significantly reduces elliptic flow even for extreme parton cross
sections and/or densities sigma_gg * dN/d\eta(b=0) ~ 45 mb * 1000. The
difference between transport and hydrodynamic elliptic flow is established
rather early during the evolution of the system, but the buildup of elliptic
flow is surprisingly insensitive to the choice of the initial (formation or
thermalization) time in both models.


title: Proton Production in d+Au Collisions and the Cronin Effect

abstract:
  Proton production in the intermediate p_T region in d+Au collisions is
studied in the parton recombination model. The recombination of soft and shower
partons is shown to be important in central collisions, but negligible in
peripheral collisions. It is found that the large nuclear modification factor
for proton production can be well reproduced by a calculation of the 3-quark
recombination process.


title: 3D Imaging in Heavy-Ion Reactions

abstract:
  We report an extension of the source imaging method for imaging full
three-dimensional sources from three-dimensional like-pair correlations. Our
technique consists of expanding the correlation data and the underlying source
function in spherical harmonics and inverting the resulting system of
one-dimensional integral equations. With this method of attack, we can image
the source function quickly, even with the extremely large data sets common in
three-dimensional analyses. We apply our method to the recently measured E859
un-Coulomb corrected data.


title:
Nonperturbative dynamics of scalar field theories through the
  Feynman-Schwinger representation

abstract:
  In this paper we present a summary of results obtained for scalar field
theories using the Feynman-Schwinger (FSR) approach. Specifically, scalar QED
and chi^2phi theories are considered. The motivation behind the applications
discussed in this paper is to use the FSR method as a rigorous tool for testing
the quality of commonly used approximations in field theory. Exact calculations
in a quenched theory are presented for one-, two-, and three-body bound states.
Results obtained indicate that some of the commonly used approximations, such
as Bethe-Salpeter ladder summation for bound states and the rainbow summation
for one body problems, produce significantly different results from those
obtained from the FSR approach. We find that more accurate results can be
obtained using other, simpler, approximation schemes.


title: Phi Meson Propagation and Decay at Finite Temperature

abstract:
  We study spectral properties of the phi meson at finite temperature using an
effective Lagrangian together with finite-temperature field theory as a basis
for modeling. General field-theoretic arguments are then used to establish the
lifetime of the phi in hot hadronic matter. We find from the model, and we
therefore propose a scenario in which, the phi decays inside the fireball.
Early decays into $\mu^{+}\mu^{-}$ occur at high temperature while measurable
hadronic decays into $K^{+}K^{-}$ (not suffering rescattering) occur at
freezeout, where flow could be substantial. These results provide a consistent
picture, if not possible interpretation of the NA49 and NA50 data from CERN.


title:
Quark-Model Baryon-Baryon Interaction and its Applications to
  Hypernuclei

abstract:
  The quark-model baryon-baryon interaction fss2, proposed by the Kyoto-Niigata
group, is a unified model for the complete baryon octet (B_8=N, Lambda, Sigma
and Xi), which is formulated in a framework of the (3q)-(3q) resonating-group
method (RGM) using the spin-flavor SU_6 quark-model wave functions and
effective meson-exchange potentials at the quark level. Model parameters are
determined to reproduce properties of the nucleon-nucleon system and the
low-energy cross section data for the hyperon-nucleon scattering. Due to the
several improvements including the introduction of vector-meson exchange
potentials, fss2 has achieved very accurate description of the NN and YN
interactions, comparable to various one-boson exchange potentials. We review
the essential features of fss2 and our previous model FSS, and their
predictions to few-body systems in confrontation with the available
experimental data. Some characteristic features of the B_8 B_8 interactions
with the higher strangeness, S=-2, -3, -4, predicted by fss2 are discussed.
These quark-model interactions are now applied to realistic calculations of
few-body systems in a new three-cluster Faddeev formalism which uses
two-cluster RGM kernels. As for the few-body systems, we discuss the
three-nucleon bound states, the Lambda NN-Sigma NN system for the hypertriton,
the alpha alpha Lambda system for 9Be Lambda, and the Lambda Lambda alpha
system for 6He Lambda Lambda.


title:
Faddeev calculation of 3 alpha and alpha alpha Lambda systems using
  alpha alpha resonating-group method kernel

abstract:
  We carry out Faddeev calculations of three-alpha (3 alpha) and two-alpha plus
Lambda (alpha alpha Lambda) systems, using two-cluster resonating-group method
kernels. The input includes an effective two-nucleon force for the alpha alpha
resonating-group method and a new effective Lambda N force for the Lambda alpha
interaction. The latter force is a simple two-range Gaussian potential for each
spin-singlet and triplet state, generated from the phase-shift behavior of the
quark-model hyperon-nucleon interaction, fss2, by using an inversion method
based on supersymmetric quantum mechanics. Owing to the exact treatment of the
Pauli-forbidden states between the clusters, the present three-cluster Faddeev
formalism can describe the mutually related, alpha alpha, 3 alpha and alpha
alpha Lambda systems, in terms of a unique set of the baryon-baryon
interactions. For the three-range Minnesota force which describes the alpha
alpha phase shifts quite accurately, the ground-state and excitation energies
of 9Be Lambda are reproduced within 100 - 200 keV accuracy.


title: The Renormalisation Group and Applications in Few-Body Physics

abstract:
  We study the distorted wave renormalisation group (DWRG), a tool for
constructing power-counting schemes in systems where some diagrams must be
summed to all orders. We solve the DWRG eqaution for a variety of long-range
potentials including the Coulomb, Yukawa and inverse square. We derive
established results in the case of the Yukawa and Coulomb potentials and new
results in the case of the inverse square potential. We generalise the DWRG to
systems of three-bodies and use it to find the power-counting for the
three-body force in the KSW EFT. This power-counting corresponds to
perturbations in the renormalisation group about a limit-cycle. We also derive
equations for the LO and NLO KSW EFT distorted waves for three bosons and for
three nucleons in the neutron-deuteron spin 1/2 channel. The physical results
in the nuclear system agree well, once the LO three-body force is determined,
with predictions of more sophistocated potential models.


title: Improved Convergence in the Three-Nucleon System at Very Low Energies

abstract:
  Neutron-deuteron scattering in the context of ``pion-less'' Effective Field
Theory at very low energies is investigated to next-to-next-to-leading order.
Convergence is improved by fitting the two-nucleon contact interactions to the
tail of the deuteron wave-function, a procedure known as Z-parameterisation and
extended here to the three-nucleon system. The improvement is particularly
striking in the doublet-S wave (triton) channel, where better agreement to
potential-model calculations and better convergence from order to order in the
power counting is achieved for momenta as high as \sim 120 MeV. Investigating
the cut-off dependence of the phase-shifts, one confirms numerically the
analytical finding that the first momentum-dependent three-body force enters at
N2LO. The other partial waves converge also substantially faster.
Effective-range parameters of the nd-system are determined, e.g. for the
quartet-S-wave scattering length a_q=[6.35\pm0.02] fm, which compares
favourably both in magnitude and uncertainty with recent high-precision
potential-model determinations. Differential cross-sections up to
E_{lab}\approx 15 MeV agree with data.


title:
Role of the Landau-Migdal Parameters with the Pseudovector and the
  Tensor Coupling in Relativistic Nuclear Models -- The Quenching of the
  Gamow-Teller Strength --

abstract:
  Role of the Landau-Migdal parameters with the pseudovector ($g_a$) and the
tensor coupling ($g_t$) is examined for the giant Gamow-Teller (GT) states in
the relativistic random phase approximation (RPA). The excitation energy is
dominated by both $g_a$ and $g_t$ in a similar way, while the GT strength is
independent of $g_a$ and $g_t$ in the RPA of the nucleon space, and is
quenched, compared with that in non-relativistic one. The coupling of the
particle-hole states with nucleon-antinucleon states is expected to quench the
GT strength further through $g_a$.


title:
Influence of electron capture and Coulomb explosion on electron
  screening in low energy nuclear reactions in laboratories

abstract:
  We discuss the effects of electron capture by the projectile and the Coulomb
explosion of a molecular projectile on the electron screening in low energy
nuclear reactions in laboratory. Using the idea of equilibrium charge, we show
that the electron capture of projectile leads to a screening energy which
significantly exceeds the adiabatic limit in the simple consideration for the
D(d,p)T reaction and provides a possibility to explain the large screening
energy claimed in the analysis of experimental data. We then show that the
Coulomb explosion can result in a large apparent screening energy as large as
that encountered in the analysis of ^3He(d,p)^4He reactions induced by the
molecular D_2^+ and D_3^+ projectiles at very low energies.


title: Shape fluctuations in a Fermi system with nonlinear dissipativity

abstract:
  The contribution of thermal fluctuations to the widths of isoscalar giant
multipole resonances (GMR) in heated nuclei is studied. Starting from the
collisional kinetic equation, it is shown that an additional contribution to
the nuclear friction and the corresponding GMR widths arises due to the
nonlinear dissipativity effect. It is also shown that the magnitude of the
contributions of the thermal fluctuations to the nuclear friction coefficient
and the GMR widths do not exceed 20%.


title: Skyrme-HFB deformed nuclear mass table

abstract:
  The Skyrme-Hartree-Fock-Bogoliubov code HFBTHO using the axial (2D)
Transformed Harmonic Oscillator basis is tested against the HFODD (3D Cartesian
HO basis) and HFBRAD (radial coordinate) codes. Results of large-scale
ground-state calculations are presented for the SLy4 and SkP interactions.


title: Neutral-current neutrino-nucleus cross-sections for A~50-65 nuclei

abstract:
  We study neutral current neutrino-nucleus reaction cross-sections for Mn, Fe,
Co and Ni isotopes. An earlier study for a few selected nuclei has shown that
in the supernova environment the cross sections are increased for low energy
neutrinos due to finite-temperature effects. Our work supports this finding for
a much larger set of nuclei. Furthermore we extend previous work to higher
neutrino energies considering allowed and forbidden multipole contributions to
the cross sections. The allowed contributions are derived from large-scale
shell model calculations of the Gamow-Teller strength, while the other
multipole contributions are calculated within the Random Phase Approximation.
We present the cross sections as functions of initial and final neutrino
energies and for a range of supernova-relevant temperatures. These cross
sections will allow improved estimates of inelastic neutrino reactions on
nuclei in supernova simulations.


title: New treatment of the chiral SU(3) quark mean field model

abstract:
  We perform a study of infinite hadronic matter, finite nuclei and hypernuclei
with an improved method of calculating the effective baryon mass. A detailed
study of the predictions of the model is made in comparison with the available
data and the level of agreement is generally very good. Comparison with an
earlier treatment shows relatively minor differences at or below normal nuclear
matter density, while at high density the improved calculation is quite
different. In particular, we find no phase transition corresponding to chiral
symmetry restoration in high density nuclear matter.


title: Nuclear Forces from Chiral Dynamics

abstract:
  We show that from analysis of time-ordered diagrams for the two-nucleon
$T$-matrix in chiral perturbation theory it follows that low energy nucleon
dynamics is governed by the generalized dynamical equation, which was derived
in [J.Phys.A., v.32, p.5657 (1999)], with a nonlocal-in-time interaction
operator. An operator is presented that parametrizes the nucleon-nucleon
interaction in the 1S0 channel at leading order of the Weinberg power counting.


title:
Variation after parity projection calculation with Skyrme interaction
  for light nuclei

abstract:
  A self-consistent calculation with variation after parity projection is
proposed to study both ground and excited states of light nuclei. This
procedure provides description of the ground state incorporating some
correlation effects, and self-consistent solutions for the excited states of
negative parity. For flexible description of nuclear shapes, single particle
orbitals are represented on a uniform grid in the three-dimensional Cartesian
coordinates. The angular momentum projection is performed after variation to
calculate rotational spectra. To demonstrate the usefulness of the method,
results are shown for two N=Z nuclei, 20Ne and 12C, for which clustering
correlations are known to be important. In the 20Ne nucleus, both cluster-like
and shell-model-like states are described simultaneously in the present
framework. For 12C nucleus, the appearance of three-alpha clustering
correlation in the ground state is investigated in relation to the strength of
the two-body spin-orbit interaction.


title: Parity-Violating Interaction Effects in the np System

abstract:
  We investigate parity-violating observables in the np system, including the
longitudinal asymmetry and neutron-spin rotation in np elastic scattering, the
photon asymmetry in np radiative capture, and the asymmetries in deuteron
photo-disintegration d(gamma,n)p in the threshold region and
electro-disintegration d(e,e`)np in quasi-elastic kinematics. To have an
estimate of the model dependence for the various predictions, a number of
different, latest-generation strong-interaction potentials--Argonne v18, Bonn
2000, and Nijmegen I--are used in combination with a weak-interaction potential
consisting of pi-, rho-, and omega-meson exchanges--the model known as DDH. The
complete bound and scattering problems in the presence of parity-conserving,
including electromagnetic, and parity-violating potentials is solved in both
configuration and momentum space. The issue of electromagnetic current
conservation is examined carefully. We find large cancellations between the
asymmetries induced by the parity-violating interactions and those arising from
the associated pion-exchange currents. In the np capture, the model dependence
is nevertheless quite small, because of constraints arising through the Siegert
evaluation of the relevant E1 matrix elements. In quasi-elastic electron
scattering these processes are found to be insignificant compared to the
asymmetry produced by gamma-Z interference on individual nucleons.


title: SHARE: Statistical Hadronization with Resonances

abstract:
  SHARE is a collection of programs designed for the statistical analysis of
particle production in relativistic heavy-ion collisions. With the physical
input of intensive statistical parameters, it generates the ratios of particle
abundances. The program includes cascade decays of all confirmed resonances
from the Particle Data Tables. The complete treatment of these resonances has
been known to be a crucial factor behind the success of the statistical
approach. An optional feature implemented is a Breit--Wigner type distribution
for strong resonances. An interface for fitting the parameters of the model to
the experimental data is provided.


title: Recent Enhancements to the MARS15 Code

abstract:
  The MARS code is under continuous development and has recently undergone
substantial improvements that further increase its reliability and predictive
power in numerous shielding, accelerator, detector and space applications. The
major developments and new features of the MARS15 (2004) version described in
this paper concern an extended list of elementary particles and arbitrary heavy
ions and their interaction cross-sections, inclusive and exclusive nuclear
event generators, module for modelling particle electromagnetic interactions,
enhanced geometry and histograming options, improved MAD-MARS Beam Line
Builder, enhanced Graphical-User Interface, and an MPI-based parallelization of
the code.

categories: nucl-th astro-ph hep-ph nucl-ex physics.acc-ph physics.space-ph


title: Towards a Heavy-ion Transport Capability in the MARS15 Code

abstract:
  In order to meet the challenges of new accelerator and space projects and
further improve modelling of radiation effects in microscopic objects,
heavy-ion interaction and transport physics have been recently incorporated
into the MARS15 Monte Carlo code. A brief description of new modules is given
in comparison with experimental data.


title:
Incorporation of three-nucleon force in the effective interaction
  hyperspherical harmonic approach

abstract:
  It is shown how a bare three-nucleon force is incorporated into the formalism
of the effective interaction approach for hyperspherical harmonics. As a
practical example we calculate the ground state properties of 3H and 3He using
the Argonne V18 nucleon-nucleon potential and the Urbana IX three-nucleon
force. A very good convergence of binding energies and matter radii is
obtained. We also find a very good agreement of our results compared to other
high precision calculations.


title: Directed flow at RHIC from Lee-Yang zeroes

abstract:
  Directed flow in ultrarelativistic nucleus-nucleus collisions is analyzed
using the reaction plane from elliptic flow, which reduces the bias from
nonflow effects. We combine this method with the determination of elliptic flow
from Lee-Yang zeroes. The resulting method is more consistent and somewhat
easier to implement than the previously used method based on three-particle
cumulants, and is also less biased by nonflow correlations. Error terms from
residual nonflow correlations are carefully estimated, as well as statistical
errors. We discuss the application of the method at RHIC and LHC.


title: Kaon and antikaon properties in cold nuclear medium

abstract:
  We present results of a self-consistent calculation for the kaon and antikaon
spectral functions in cold nuclear matter, using as input the kaon-nucleon and
antikaon-nucleon scattering amplitudes of the vacuum. We investigate the effect
of in-medium pion dressing on the antikaon-nucleon scattering amplitudes and
antikaon spectral function. We find the influence of pion dressing to be minor
on the antikaon spectral function and limited on the hyperon resonances causing
only a small additional broadening. An exception is the \Sigma(1690). At
nuclear saturation density an attractive mass shift of about 20 MeV and width
of about 130 MeV is obtained. The kaon shows a repulsive mass increase of 36
MeV and a small width of the quasiparticle peak at saturation density.


title: Hybrid stars with the color dielectric and the MIT bag models

abstract:
  We study the hadron-quark phase transition in the interior of neutron stars
(NS). For the hadronic sector, we use a microscopic equation of state (EOS)
involving nucleons and hyperons derived within the Brueckner-Bethe-Goldstone
many-body theory, with realistic two-body and three-body forces. For the
description of quark matter, we employ both the MIT bag model with a density
dependent bag constant, and the color dielectric model. We calculate the
structure of NS interiors with the EOS comprising both phases, and we find that
the NS maximum masses are never larger than 1.7 solar masses, no matter the
model chosen for describing the pure quark phase.


title: Does Sub-Barrier Bremsstrahlung in alpha-decay of 210Po Exist?

abstract:
  A quantum mechanical model for the description of the alpha-decay of heavy
nuclei with accompanying photons emission is presented. The model is based on a
quantum mechanical one-particle model of alpha-decay through a decay barrier.
The bremsstrahlung spectrum calculation employs multipole expansion of the
vector potential of the Coulomb field of the daughter nucleus and takes into
account the dependence on the angle between the directions of the
alpha-particle propagation and the photon emission. Spectra of 210Po are
obtained for the angles 25 and 90, and the best agreement with the experimental
data in the 90 case in a comparison with other existing models is achieved.
  From the angular analysis, the model gives monotonic behavior of the
bremsstrahlung spectrum for any value of the angle. We find that sub-barrier
photon emission (i. e. bremsstrahlung photon emission during alpha-particle
tunneling through decay barrier) exists but gives a small contribution to the
total bremsstrahlung spectrum.


title: Application of the Pauli principle in many-body scattering

abstract:
  A new development in the antisymmetrization of the first-order
nucleon-nucleus elastic microscopic optical potential is presented which
systematically includes the many-body character of the nucleus within the
two-body scattering operators. The results reduce the overall strength of the
nucleon-nucleus potential and require the inclusion of historically excluded
channels from the nucleon-nucleon potential input. Calculations produced
improve the match with neutron-nucleus total cross section, elastic
proton-nucleus differential cross section, and spin observable data. A
comparison is also done using different nucleon-nucleon potentials from the
past twenty years.


title: WKB approximation for multi-channel barrier penetrability

abstract:
  Using a method of local transmission matrix, we generalize the well-known WKB
formula for a barrier penetrability to multi-channel systems. We compare the
WKB penetrability with a solution of the coupled-channels equations, and show
that the WKB formula works well at energies well below the lowest adiabatic
barrier. We also discuss the eigen-channel approach to a multi-channel
tunneling, which may improve the performance of the WKB formula near and above
the barrier.


title: Enhanced Stability of Superheavy Nuclei due to High-Spin Isomerism

abstract:
  Configuration-constrained calculations of potential-energy surfaces in
even-even superheavy nuclei reveal systematically the existence at low
excitation energies of multi-quasiparticle states with deformed axially
symmetric shapes and large angular momenta. These results indicate the
prevalence of long-lived, multi-quasiparticle isomers. In a quantal system, the
ground state is usually more stable than the excited states. In contrast, in
superheavy nuclei the multi-qausiparticle excitations decrease the probability
for both fission and $\alpha$ decay, implying enhanced stability. Hence, the
systematic occurrence of multi-qausiparticle isomers may become crucial for
future production and study of even heavier nuclei. The energies of
multi-quasiparticle states and their $\alpha$ decays are calculated and
compared to available data.


title:
Multichannel processes in relativistic Coulomb excitation mediated by a
  quantized electromagnetic field

abstract:
  This paper has been withdrawn because it draws incorrect conclusions from the
results of its calculations.


title:
Relation between the critical spin and angular velocity of a nucleus
  immediately after backbending

abstract:
  In nonspherical nuclei at $J = J_c + 0$ the relationship between the angular
momentum and angular velocity immediately after backbending is the same as in
the limiting case $J - J_c\to\infty$. This indicates that there is a unique
type of cancellation of the deviations from a rigid-body moment of inertia in
the upper phase $J>J_c$. An integral relationship is found which expresses this
cancellation quantitatively. This formula permits $J_c$ to be calculated for
the rotational bands of the even-even nuclei studied and the results are in
agreement with those obtained by other methods of locating the Curie point. For
the ground state band of W$^{170}$ the cancellation of the reciprocals of the
true and rigid-body moments of inertia can be verified directly. The condition
for the stability of the rotation of a nonspherical nucleus is analyzed in the
Appendix in close connection with the problem of a reasonable definition of the
concept of a variable moment of inertia.


title:
Self Consistent Random Phase Approximation and the restoration of
  symmetries within the three-level Lipkin model

abstract:
  We show that it is possible to restore the symmetry associated with the
Goldstone mode within the Self Consistent Random Phase Approximation (SCRPA)
applied to the three-level Lipkin model. We determine one and two-body
densities as very convergent expansions in terms of the generators of the RPA
basis. We show that SCRPA excitations correspond to the heads of some
rotational bands in the exact spectrum. It turns out that the SCRPA eigenmodes
for N=2 coincide with exact solutions, given by the diagonalisation procedure.


title: Band structure effects for dripped neutrons in neutron star crust

abstract:
  The outer layers of a neutron star are supposed to be formed of a solid
Coulomb lattice of neutron rich nuclei. At densities above neutron drip density
(about one thousandth of nuclear saturation density), this lattice is immersed
in a neutron fluid. Bragg scattering of those dripped neutrons by the nuclei
which has been usually neglected is investigated, within a simple mean field
model with Bloch type boundary conditions. The main purpose of this work is to
provide some estimates for the entrainment coefficients, as required for
hydrodynamical two fluid simulations of neutron star crust, which relate the
momentum of one fluid to the particle currents of the other two fluids. The
implications for the equilibrium neutron star crust structure are also briefly
discussed.


title: Neutral-current neutrino-nucleus quasielastic scattering

abstract:
  A relativistic distorted-wave impulse-approximation model to quasielastic
neutral-current neutrino-nucleus scattering is developed, using the
relativistic mean field theory for the bound state and taking into account the
final state interaction in the relativistic scattering state. Results for the
neutrino (antineutrino) reaction on 12C target nucleus are presented in an
energy range between 500 and 1000 MeV. The sensitivity to the strange quark
content of the axial-vector form factor is discussed.


title: Splashing and evaporation of nucleons from excited nuclei

abstract:
  The energy spectrum and the emission rate of particles emitted from excited
nucleus due to both the evaporation and the splashing (emission from a cold
vibrating nucleus) are calculated. We show that the collective motion of the
nuclear Fermi liquid is accompanied by direct non-statistical emission of
nucleons via the dynamical distortion of the Fermi surface.


title:
Improved analysis of neutral pion electroproduction off deuterium in
  chiral perturbation theory

abstract:
  Near threshold neutral pion electroproduction on the deuteron is studied in
the framework of heavy baryon chiral perturbation theory. We include the
next-to-leading order corrections to the three-body contributions. We find an
improved description of the total and differential cross section data measured
at MAMI. We also obtain more precise values for the threshold S-wave
multipoles. We discuss in detail the theoretical uncertainties of the
calculation.


title: The Caloric Curve for Mononuclear Configurations

abstract:
  The caloric curve for mononuclear configurations is studied with a schematic
model. We investigate the dependence of the entropy on the density and
effective mass profiles. A plateau in the caloric curve is a direct result of
decreasing density and the destruction of correlations with increasing
excitation. The mononuclear regime is metastable with respect to binary fission
at low excitation energy and unstable with respect to multifragmentation at
high excitation. The statistical framework presented here is suitable to treat
scenarios where experimental conditions are set to favor population of highly
excited mononuclear states.


title: Evidence of Pentaquark States from K+ N Scattering Data?

abstract:
  Motivated by the recent experimental evidence of the exotic B = S = +1
baryonic state Theta(1540), we examine the older existing data on K+ N elastic
scattering through the time delay method. We find positive peaks in time delay
around 1.545 and 1.6 GeV in the D03 and P01 partial waves of K+ N scattering
respectively, in agreement with experiments. We also find an indication of the
J=3/2 Theta* spin-orbit partner to the Theta, in the P03 partial wave at 1.6
GeV. We discuss the pros and contras of these findings in support of the
interpretation of these peaks as possible exotics.


title:
Reply to Comment on Extension of the Bethe-Weizsacker mass formula to
  light nuclei and some new shell closures

abstract:
  Some properties of the modified Bethe-Weizsacker mass formula (BWM) are
discussed. As BWM has no shell effect included, the extra-stability or,
magicity in nuclei clearly stands out when experimental mass data are compared
with BWM predictions. If the shell effect quenches, the BWM predictions come
closer to the experimental data.


title:
Superfluidity of $\Sigma^-$ hyperons in $\beta$-stable neutron star
  matter

abstract:
  In this work we evaluate the $^1S_0$ energy gap of $\Sigma^-$ hyperons in
$\beta$-stable neutron star matter. We solve the BCS gap equation for an
effective $\Sigma^-\Sigma^-$ pairing interaction derived from the most recent
parametrization of the hyperon-hyperon interaction constructed by the Nijmegen
group. We find that the $\Sigma^-$ hyperons are in a $^1S_0$ superfluid state
in the density region $\sim 0.27-0.7$ fm$^{-3}$, with a maximum energy gap of
order 8 MeV at a total baryon number density of $\sim 0.37$ fm$^{-3}$ and a
$\Sigma^-$ fraction of about 8%. We examine the implications on neutron star
cooling.


title: Exactly solvable Richardson-Gaudin models for many-body quantum systems

abstract:
  The use of exactly-solvable Richardson-Gaudin (R-G) models to describe the
physics of systems with strong pair correlations is reviewed. We begin with a
brief discussion of Richardson's early work, which demonstrated the exact
solvability of the pure pairing model, and then show how that work has evolved
recently into a much richer class of exactly-solvable models. We then show how
the Richardson solution leads naturally to an exact analogy between such
quantum models and classical electrostatic problems in two dimensions. This is
then used to demonstrate formally how BCS theory emerges as the large-N limit
of the pure pairing Hamiltonian and is followed by several applications to
problems of relevance to condensed matter physics, nuclear physics and the
physics of confined systems. Some of the interesting effects that are discussed
in the context of these exactly-solvable models include: (1) the crossover from
superconductivity to a fluctuation-dominated regime in small metallic grains,
(2) the role of the nucleon Pauli principle in suppressing the effects of high
spin bosons in interacting boson models of nuclei, and (3) the possibility of
fragmentation in confined boson systems. Interesting insight is also provided
into the origin of the superconducting phase transition both in two-dimensional
electronic systems and in atomic nuclei, based on the electrostatic image of
the corresponding exactly-solvable quantum pairing models.

categories: nucl-th cond-mat.supr-con nlin.SI quant-ph


title: Fragmentation path of excited nuclear systems

abstract:
  We perform a study of the fragmentation path of excited nuclear sources,
within the framework of a stochastic mean-field approach. We consider the
reaction $^{129}$Xe + $^{119}$Sn at two beam energies: 32 and 50 MeV/A, for
central collisions. It is observed that, after the compression phase the system
expands towards a dilute configuration from which it may recontract or evolve
into a bubble-like structure. Then fragments are formed through the development
of volume and/or surface instabilities. The two possibilities co-exist at 32
MeV/A, leading to quite different fragment partitions, while at 50 MeV/A the
hollow configuration is observed in all events. Large variances are recovered
in a way fully consistent with the presence of spinodal decomposition remnants.
Kinematical properties of fragments are discussed and suggested as observables
very sensitive to the dominant fragment production mechanism. A larger radial
collective flow is observed at 50 MeV/A, in agreement with experiments.


title: New Forms of QCD Matter Discovered at RHIC

abstract:
  We discuss two special limiting forms of QCD matter which may be produced at
RHIC. We conclude from the available empirical evidence that an equilibrated,
but strongly coupled Quark Gluon Plasma has been made in such collisions. We
also discuss the growing body of evidence that its source is a Color Glass
Condensate.


title:
New Constraint of Clustering for AMD and Its Application to the Study of
  $2\alpha$-$^{12}$C Structure of $^{20}$Ne

abstract:
  A new constraint of clustering for the AMD calculation is proposed. This new
constraint gives us large improvement in studying the cluster structure by AMD
which sometimes meets difficulty in giving rise to some specific cluster
configurations. The usefulness of this new constraint is verified by applying
it to the the study of the third $K^\pi = 0^+$ band of $^{20}$Ne which has been
discussed to have $2\alpha$-$^{12}$C structure. This band has not been easy
even to construct by AMD. We see that the AMD+GCM calculation by the use of the
new constraint gives rise to the third $K^\pi = 0^+$ band which contains the
$2\alpha$-$^{12}$C structure as an important component.


title:
Study on chemical equilibrium in nucleus-nucleus collisions at
  relativistic energies

abstract:
  We present a detailed study of chemical freeze-out in nucleus-nucleus
collisions at beam energies of 11.6, 30, 40, 80 and 158A GeV. By analyzing
hadronic multiplicities within the statistical hadronization approach, we have
studied the chemical equilibration of the system as a function of center of
mass energy and of the parameters of the source. Additionally, we have tested
and compared different versions of the statistical model, with special emphasis
on possible explanations of the observed strangeness hadronic phase space
under-saturation.


title: Low-momentum interaction in few-nucleon systems

abstract:
  The effective low-momentum interaction Vlowk is applied to three- and
four-nucleon systems. We investigate the 3H, 3He and 4He binding energies for a
wide range of the momentum cutoffs. By construction, all low-energy two-body
observables are cutoff-independent, and therefore, any cutoff dependence is due
to missing three-body or higher-body forces. We argue that for reasonable
cutoffs Vlowk is similar to high-order interactions derived from chiral
effective field theory. This motivates augmenting Vlowk by corresponding
three-nucleon forces. The set of low-momentum twoand three-nucleon forces can
be used in calculations of nuclear structure and reactions.


title: Discovery of Jet Quenching and Beyond

abstract:
  Recent observation of high-$p_T$ hadron spectra suppression and mono-jet
production in central $Au+Au$ collisions and their absence in $d+Au$ collisions
at RHIC have confirmed the long predicted phenomenon of jet quenching in
high-energy heavy-ion collisions. Detailed analyses of the experimental data
also show parton energy loss as the mechanism for the discovered jet quenching.
Using a pQCD parton model that incorporates medium modified parton
fragmentation functions and comparing to experimental data from deeply
inelastic scattering off nuclei, one can conclude that the initial gluon
(energy) density of the hot matter produced in central $Au+Au$ collisions that
causes jet quenching at RHIC is about 30 (100) times higher than in a cold $Au$
nucleus. Combined with data on bulk and collective properties of the hot
matter, the observed jet quenching provides strong evidence for the formation
of a strongly interacting quark gluon plasma in central $Au+Au$ collisions at
RHIC.


title: Flow effects on multifragmentation in the canonical model

abstract:
  A prescription to incorporate the effects of nuclear flow on the process of
multifragmentation of hot nuclei is proposed in an analytically solvable
canonical model. Flow is simulated by the action of an effective negative
external pressure. It favors sharpening the signatures of liquid-gas phase
transition in finite nuclei with increased multiplicity and a lowered phase
transition temperature.


title: Shell corrections for finite depth potentials with bound states only

abstract:
  A new method of calculating unique values of ground-state shell corrections
for finite depth potentials is shown, which makes use of bound states only. It
is based on (i) a general formulation of extracting the smooth part from any
fluctuating quantity proposed by Strutinsky and Ivanjuk, (ii) a generalized
Strutinsky smoothing condition suggested recently by Vertse et al., and (iii)
the technique of the Lanczos $\sigma$ factors. Numerical results for some
spherical heavy nuclei ($^{132,154}$Sn, $^{180,208}$Pb and $^{298}$114) are
presented and compared to those obtained with the Green's function oscillator
expansion method.


title: Fluctuations from Thermalization at RHIC

abstract:
  The centrality dependence of dynamic fluctuations of the transverse momentum
and the net charge can signal the approach to local thermal equilibrium in
nuclear collisions. I explore this signal by comparing transport-theory
calculations to STAR and PHENIX data at a range of energies. In particular, I
find that this model can describe PHENIX data on the dependence of fluctuations
on the transverse momentum range in which they are measured.


title: Some Aspects of Deeply Virtual Compton Scattering

abstract:
  We consider different aspects of the virtual Compton amplitude in QCD on two
examples: small-x physics accessible in the Regge regime and twist-3
approximation in the description of DVCS through the general parton
distributions. Using this model, we give an estimate for the cross section of
deeply virtual Compton scattering for the kinematics of CEBAF at Jefferson Lab.


title: Effective hadron masses and effective interactions in nuclear matter

abstract:
  Relations among the effective hadron masses and the effective interactions in
nuclear matter are studied by using the generalized relativistic mean field
theory. We found that we can make the effective omega-meson mass smaller and
the equation of state softer if we require that the omega-meson mean field is
proportional to the baryon density. In this case, there is a simple and exact
relation between the effective omega-meson mass and the effective omega-nucleon
coupling. Because of this relation, the effective omega-nucleon coupling
automatically decreases if the effective omega-meson mass decreases.
Consequently, the equation of state becomes softer. A trial to embed the QCD
sum-rule results into the hadron field theory is also shown.


title: N and Delta Resonances in the Rigid Quark-Diquark Vibrator

abstract:
  A nearest-neighbor analysis of light flavor baryon mass spectra reveals
striking degeneracy patterns- narrow mass bands populated by series of parity
twins of steadily increasing spins. Each series terminates by an unpaired
resonance of the highest spin in the group. We trace back such degenerate
series of resonances (to be termed "mega states") to internal baryon structure
dominated by a quark -(rigid di-quark) configuration. Nucleon and Delta spectra
are, surprisingly enough, exact replicas to each other in the sense that each
of them features three mega states of equal quantum numbers. We fit positions
and splittings of the observed mega states by an algebraic Hamiltonian which
translates into a potential that is a combination of Coulomb- and Morse like
potentials and predict few more such degenerate series to be observed by the
TJNAF missing resonance program. Finally, we explore consequences of the model
for some electrodynamic properties of the spectra.


title: The pentaquark in K-plus-d total cross section data

abstract:
  An analysis of $K^+$-d total cross section data is undertaken to explore
possible effects of the recently observed resonance in the S=+1 hadronic system
with mass around 1.55 GeV. It is found that a structure corresponding to the
resonance is visible in the data. The width consistent with the observed
deviation from background is found to be $0.9\pm 0.3$ MeV and the mass is
$1.559\pm 0.003$ GeV/c$^2$ for spin-parity $\h^+$ and $1.547\pm0.002$\
GeV/c$^2$ for $\h^-$. The errors are one standard deviation and statistical
only.
  \