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

abstract:
  It is found that the radius of a stable strangelet decreases as the
temperature increases in a quark mass density-dependent model. To overcome this
difficulty, we extend this model to a quark mass density- and temperature-
dependent model in which the vacuum energy density at zero baryon density limit
B depends on temperature. An ansatz is introduced and the regions for the best
choice of the parameters are studied.


title: Charge and stability of strange quark matter at finite temperature

abstract:
  By means of the quark mass density- and temperature- dependent model, it is
found that the negative charge and the higher strangeness fraction are in favor
of the stability of strange quark matter at finite temperature. A critical
baryon number density n_Bc has been found. The strange quark matter is unstable
when n_B < n_Bc. The charge and strangeness fraction dependence of stability
for strange quark matter is addressed.


title:
Gradient Symplectic Algorithms for Solving the Schroedinger Equation
  with Time-Dependent Potentials

abstract:
  We show that the method of factorizing the evolution operator to fourth order
with purely positive coefficients, in conjunction with Suzuki's method of
implementing time-ordering of operators, produces a new class of powerful
algorithms for solving the Schroedinger equation with time-dependent
potentials. When applied to the Walker-Preston model of a diatomic molecule in
a strong laser field, these algorithms can have fourth order error coefficients
that are three orders of magnitude smaller than the Forest-Ruth algorithm using
the same number of Fast Fourier Transforms. When compared to the second order
split-operator method, some of these algorithms can achieve comparable
convergent accuracy at step sizes 50 times as large. Morever, we show that
these algorithms belong to a one-parameter family of algorithms, and that the
parameter can be further optimized for specific applications.


title:
Quasi Free 238U (e,e'f)-Cross Section in Macroscopic-Microscopic
  Approach

abstract:
  We present the result of a theoretical study of inclusive quasi free
electrofission of $^{238}$U. The off-shell $ $cross sections for the quasi free
reaction stage have been calculated within the Plane Wave Impulse Approximation
(PWIA), using a Macroscopic -Microscopic description of the proton and neutron
single particle momentum distributions. Electron wave function distortion
corrections were included using the effective momentum approximation, and the
Final State Interaction (FSI) effects were calculated using an optical
potential. The fissility for the proton single hole excited states of the
residual nucleus $^{237}$Pa was calculated both without and with contributions
of the pre-equilibrium emission of the particles. The fissility for
$^{237,238}U$ residual nuclei was calculated within the compound nucleus model.
The $(e,e^{\prime}f)-$cross sections thus obtained were compared with available
experimental data.


title:
Quark Condensates and Momentum-Dependent Quark Masses in a Nonlocal
  Nambu--Jona-Lasinio Model

abstract:
  The Nambu--Jona-Lasinio (NJL) model has been extensively studied by many
researchers. In previous work we have generalized the NJL model to include a
covariant model of confinement. In the present work we consider further
modification of the model so as to reproduce the type of Euclidean-space
momentum- dependent quark mass values obtained in lattice simulations of QCD.
This may be done by introducing a nonlocal interaction, while preserving the
chiral symmetry of the Lagrangian. In other work on nonlocal models, by other
researchers, the momentum dependence of the quark self-energy is directly
related to the regularization scheme. In contrast, in our work, the
regularization is independent of the nonlocality we introduce. It is of
interest to note that the value of the condensate ratio,
$<\bar{s}s>/<\bar{u}d>$, is about 1.7 when evaluated using chiral perturbation
theory and is only about 1.1 in standard applications of the NJL model. We find
that our nonlocal model can reproduce the larger value of the condensate ratio
when reasonable values are used for the strength of the 't Hooft interaction.
(In an earlier study of the $\eta$(547) and $\eta$'(958) mesons, we found that
use of the larger value of the condensate ratio led to a very good fit to the
mixing angles and decay constants of these mesons.) We also study the density
dependence of both the quark condensate and the momentum-dependent quark mass
values. Without the addition of new parameters, we reproduce the density
dependence of the condensate given by a well-known model- independent
expression valid for small baryon density.


title: Neutrino Rates in Color Flavor Locked Quark Matter

abstract:
  We study the weak interaction rates involving Goldstone bosons in the Color
Flavor Locked (CFL) quark matter. Neutrino mean free path and the rate of
energy loss due to neutrino emission in a thermal plasma of CFL pions and kaons
is calculated. We find that in addition to neutrino scattering off thermal
mesons, novel Cherenkov like processes wherein mesons are either emitted or
absorbed contribute to the neutrino opacity. Lack of Lorentz invariance in the
medium and loss of rotational invariance for processes involving mesons moving
relative to the medium allow for novel processes such as $\pi^0 \to \nu
\bar{\nu}$ and $e^- \pi^+ \to \nu_e$. We explore and comment on various
astrophysical implications of our finding.


title: An extrapolation method for shell model calculations

abstract:
  We propose a new shell model method, combining the Lanczos digonalization and
extrapolation method. This method can give accurate shell model energy from a
series of shell model calculations with various truncation spaces, in a
well-controlled manner. Its feasibility is demonstrated by taking the fp shell
calculations.


title:
Ab initio approach to s-shell hypernuclei 3H_Lambda, 4H_Lambda,
  4He_Lambda and 5He_Lambda with a Lambda N-Sigma N interaction

abstract:
  Variational calculations for s-shell hypernuclei are performed by explicitly
including $\Sigma$ degrees of freedom. Four sets of YN interactions (SC97d(S),
SC97e(S), SC97f(S) and SC89(S)) are used. The bound-state solution of
$_\Lambda^5$He is obtained and a large energy expectation value of the tensor
$\Lambda N-\Sigma N$ transition part is found. The internal energy of the
$^4$He subsystem is strongly affected by the presence of a $\Lambda$ particle
with the strong tensor $\Lambda N-\Sigma N$ transition potential.


title:
Statistical Fluctuations of Electromagnetic Transition Intensities and
  Electromagnetic Moments in pf-Shell Nuclei

abstract:
  We study the fluctuation properties of $\Delta T=0$ electromagnetic
transition intensities and electromagnetic moments in $A \sim 60$ nuclei within
the framework of the interacting shell model, using a realistic effective
interaction for
  $pf$-shell nuclei with a $^{56}$Ni core. The distributions of the transition
intensities and of the electromagnetic moments are well described by the
Gaussian orthogonal ensemble of random matrices. In particular, the transition
intensity distributions follow a Porter-Thomas distribution. When diagonal
matrix elements (i.e., moments) are included in the analysis of transition
intensities, we find that the distributions remain Porter-Thomas except for the
isoscalar $M1$. The latter deviation is explained in terms of the structure of
the isoscalar $M1$ operator.


title: Spontaneous heavy cluster emission rates using microscopic potentials

abstract:
  The nuclear cluster radioactivities have been studied theoretically in the
framework of a microscopic superasymmetric fission model (MSAFM). The nuclear
interaction potentials required for binary cold fission processes are
calculated by folding in the density distribution functions of the two
fragments with a realistic effective interaction. The microscopic nuclear
potential thus obtained has been used to calculate the action integral within
the WKB approximation. The calculated half lives of the present MSAFM
calculations are found to be in good agreement over a wide range of observed
experimental data.


title: Pionic susceptibility for charged pions in asymmetric nuclei

abstract:
  At low energies the particle-hole (ph) part of the pionic susceptibility in
isospin-symmetric nuclear matter is known to behave very differently from the
susceptibility in finite nuclei due to the presence of an energy gap in the ph
excitation spectrum. In this note we show that for charged pions in N > Z
nuclei the changes due to the gap are very similar to those in the symmetric
case, except at very low momenta, where a qualitatively different behavior is
found.


title:
Three-Nucleon Force Effects in Nucleon Induced Deuteron Breakup:
  Predictions of Current Models (I)

abstract:
  An extensive study of three-nucleon force effects in the entire phase space
of the nucleon-deuteron breakup process, for energies from above the deuteron
breakup threshold up to 200 MeV, has been performed. 3N Faddeev equations have
been solved rigorously using the modern high precision nucleon-nucleon
potentials AV18, CD Bonn, Nijm I, II and Nijm 93, and also adding 3N forces. We
compare predictions for cross sections and various polarization observables
when NN forces are used alone or when the two pion-exchange Tucson-Melbourne
3NF was combined with each of them. In addition AV18 was combined with the
Urbana IX 3NF and CD Bonn with the TM' 3NF, which is a modified version of the
TM 3NF, more consistent with chiral symmetry. Large but generally model
dependent 3NF effects have been found in certain breakup configurations,
especially at the higher energies, both for cross sections and spin
observables. These results demonstrate the usefulness of the kinematically
complete breakup reaction in testing the proper structure of 3N forces.


title: Optical potentials of halo and weakly bound nuclei

abstract:
  The optical potential of halo and weakly bound nuclei has a long range part
due to the coupling to breakup that damps the elastic scattering angular
distributions at all angles for which the effect of the nuclear interaction is
felt. In charge exchange reactions leading to a final state with a halo
nucleus, the surface potential is responsible for a strong reduction in the
absolute cross section. We show how the halo effect can be simply estimated
semiclassically and related to the properties of the halo wave function.
Assuming an exponential tail for the imaginary surface potential we show that
the most important parameter is the diffusness $\alpha$ of the potential which
is directly related to the decay length $\gamma_i$ of the initial wave function
by $\alpha\approx(2\gamma_i)^{-1}$


title:
Effective lagrangian approach to structure of selected nuclei far from
  sta bility

abstract:
  The convergence of the effective field theory (EFT) approach of Furnstahl,
Serot and Tang to the nuclear many-body problem is studied by applying it to
selected doubly-magic nuclei far from stability. An independently developed
code, which can incorporate various levels of approximation of the chiral
effective lagrangi an, is used to solve the self-consistent relativistic
Hartree equations. Results are obtained for ground-state properties such as
binding energies, single-parti cle level structure, and densities of the
selected spherical, doubly-magic nucle i 132-Sn, 100-Sn and 48-Ni, 78-Ni.
Calculated spectra of neigh boring nuclei differing by one particle or one hole
show agreement with the most recent experimental data. Predictions for nucleon
densities are presented.


title:
Three-Nucleon Force Effects in Nucleon Induced Deuteron Breakup:
  Comparison to Data (II)

abstract:
  Selected Nd breakup data over a wide energy range are compared to solutions
of Faddeev equations based on modern high precision NN interactions alone and
adding current three-nucleon force models. Unfortunately currently available
data probe phase space regions for the final three nucleon momenta which are
rather insensitive to 3NF effects as predicted by current models. Overall there
is good to fair agreement between present day theory and experiment but also
some cases exist with striking discrepancies. Regions in the phase space are
suggested where large 3NF effects can be expected.


title:
Matrix Elements of Random Operators and Discrete Symmetry Breaking in
  Nuclei

abstract:
  It is shown that several effects are responsible for deviations of the
intensity distributions from the Porter-Thomas law. Among these are genuine
symmetry breaking, such as isospin; the nature of the transition operator;
truncation of the Hilbert space in shell model calculations and missing
transitions


title: Fluctuation of Gaps in Hadronization at Phase Transition

abstract:
  Event-by-event fluctuations of hadronic patterns in heavy-ion collisions are
studied in search for signatures of quark-hadron phase transition. Attention is
focused on a narrow strip in the azimuthal angle with small $\Delta y$. The
fluctuations in the gaps between particles are quantified by simple measures. A
scaling exponent $\alpha$ is shown to exist around $T_c$. An index $\xi$ is
shown to characterize the critical fluctuation; it is a numerical constant
$\xi=0.05\pm0.01$. All the measures considered in this gap analysis are
experimentally observable. Whether or not the theoretical predictions, based on
simulations using 2-dimensional Ising model, are realistic for heavy-ion
collisions, analysis of the experimental data suggested here should be carried
out, since the existence of a scaling behavior is of interest in its own right.


title:
Dileptons and Photons from Coarse-Grained Microscopic Dynamics and
  Hydrodynamics Compared to Experimental Data

abstract:
  Radiation of dileptons and photons from high energy nuclear collisions
provides information on the space-time evolution of the hot dense matter
produced therein. We compute this radiation using relativistic hydrodynamics
and a coarse-grained version of the microscopic event generator UrQMD, both of
which provide a good description of the hadron spectra. The currently most
accurate dilepton and photon emission rates from perturbative QCD and from
experimentally-based hadronic calculations are used. Comparisons are made to
data on central Pb-Pb and Pb-Au collisions taken at the CERN SPS at a beam
energy of 158 A GeV. Both hydrodynamics and UrQMD provide very good
descriptions of the photon transverse momentum spectrum measured between 1 and
4 GeV, but slightly underestimate the low mass spectrum of e+e- pairs, even
with greatly broadened rho and omega vector mesons. Predictions are given for
the transverse momentum distribution of dileptons.


title: Nucleon dynamics in effective field theory of nuclear forces

abstract:
  Low energy nucleon dynamics in the effective field theory (EFT) of nuclear
forces is investigated by using the formalism of the generalized quantum
dynamics (GQD). This formalism is based on a generalized dynamical equation
derived as the most general equation of motion consistent with the current
concepts of quantum theory and allows one to extend quantum dynamics to the
case where the fundamental interaction in a quantum system is nonlocal in time.
The Schr{\"o}dinger equation follows from this equation in the case where the
interaction in a system is instantaneous. We show that the effective theory of
nuclear forces gives rise to low energy nucleon dynamics which is governed by
the generalized dynamical equation with a nonlocal-in-time interaction
operator. This operator is shown to provide a natural parametrization of the
interaction of nucleons and can be derived order by order by using methods of
subtractive EFT's. We show that the use of the GQD for describing nucleon
dynamics allows one to formulate the EFT of nuclear forces as a completely
consistent theory with a well-defined equation of motion which does not require
renormalization.


title:
Nuclear re-interaction effects in quasi-elastic neutrino nucleus
  scattering

abstract:
  The quasi-elastic neutrino-nucleus cross section has been calculated by using
a Fermi gas model corrected to consider the re-scattering between the emitted
nucleon and the rest nucleus. As an example of the relevance of this effect we
show results for the muon production cross section on 16O target.


title:
Probing hadronic formation times with antiprotons in p+A reactions at
  AGS energies

abstract:
  The production of antiprotons in $p+A$ reactions is calculated in a
microscopic transport approach employing hadronic and string degrees of freedom
(HSD). It is found that the abundancies of antiprotons as observed by the E910
Collaboration in $p+A$ reactions at 12.3 GeV/c as well as 17.5 GeV/c can
approximately be described on the basis of primary proton-nucleon and secondary
meson-baryon production channels for all targets. The transport calculations
demonstrate that the antiproton rapidity distributions for heavy targets are
sensitive to the $\bar{p}$ (or hadron) formation time in the nuclear medium.
Within our analysis the data from the E910 Collaboration are reasonably
described with a formation time of $ 0.4-0.8$ fm/c in the hadron rest frame.


title: Statistical Physics in a Finite Volume with Absolute Conservation Laws

abstract:
  Recursion relations are used to exactly calculate the partition function of a
canonical ensemble in which all additive charges as well as the total isospin
are strictly conserved. The ensemble can consist of particles that obey either
classical or quantum statistics. Recursion relations are also employed to
compute observables such as multiplicity distributions and isospin
fluctuations.


title:
Investigation of the high momentum component of nuclear wave function
  using hard quasielastic A(p,2p)X reactions

abstract:
  We present theoretical analysis of the first data on the high energy and
momentum transfer (hard) quasielastic $C(p,2p)X$ reactions. The cross section
of hard $A(p,2p)X$ reaction is calculated within the light-cone impulse
approximation based on two-nucleon correlation model for the high-momentum
component of the nuclear wave function. The nuclear effects due to modification
of the bound nucleon structure, soft nucleon-nucleon reinteraction in the
initial and final states of the reaction with and without color coherence have
been considered. The calculations including these nuclear effects show that the
distribution of the bound proton light-cone momentum fraction $(\alpha)$ shifts
towards small values ($\alpha < 1$), effect which was previously derived only
within plane wave impulse approximation. This shift is very sensitive to the
strength of the short range correlations in nuclei. Also calculated is an
excess of the total longitudinal momentum of outgoing protons. The calculations
are compared with data on the $C(p,2p)X$ reaction obtained from the EVA/AGS
experiment at Brookhaven National Laboratory. These data show $\alpha$-shift in
agreement with the calculations. The comparison allows also to single out the
contribution from short-range nucleon correlations. The obtained strength of
the correlations is in agreement with the values previously obtained from
electroproduction reactions on nuclei.


title: Extended RPA within a solvable 3 level model

abstract:
  Working within an exactly solvable 3 level model, we discuss am extension of
the
  Random Phase Approximation (RPA) based on a boson formalism. A boson
Hamiltonian is defined via a mapping procedure and its expansion truncated at
four-boson terms. RPA-type equations are then constructed and solved
iteratively. The new solutions gain in stability with respect to the RPA ones.
We perform diagonalizations of the boson Hamiltonian in spaces containing up to
four-phonon components. Approximate spectra exhibit an improved quality with
increasing the size of these multiphonon spaces. Special attention is addressed
to the problem of the anharmonicity of the spectrum.


title:
Unlike particle correlations and the strange quark matter distillation
  process

abstract:
  We present a new technique for observing the strange quark matter
distillation process based on unlike particle correlations. A simulation is
presented based on the scenario of a two-phase thermodynamical evolution model.


title:
Searching for the statistically equilibrated systems formed in heavy ion
  collisions

abstract:
  Further improvements and refinements are brought to the microcanonical
multifragmentation model [Al. H. Raduta and Ad. R. Raduta, Phys. Rev. C {\bf
55}, 1344 (1997); {\it ibid.} {\bf 61}, 034611 (2000)]. The new version of the
model is tested on the recently published experimental data concerning the
Xe+Sn at 32 MeV/u and Gd+U at 36 MeV/u reactions. A remarkable good
simultaneous reproduction of fragment size observables and kinematic
observables is to be noticed. It is shown that the equilibrated source can be
unambiguously identified.


title:
On the polarization effects in (p,n) reactions between the A=48
  isobarical states

abstract:
  Isotopical dependence of spin-orbit splitting discovered by us in spectra of
heavy nuclei close to doubly magic ones is checked in polarization effects
arising in charge exchange (p,n) reaction between the A=48 isobarical states.


title:
Consistency of spectroscopic factors from (e,e'p) reactions at different
  momentum transfers

abstract:
  The possibility to extract relevant information on spectroscopic factors from
(e,e$'$p) reactions at high $Q^2$ is studied. Recent ${}^{16}$O(e,e$'$p) data
at $Q^2 = 0.8$ (GeV/$c)^2$ are compared to a theoretical approach which
includes an eikonal description of the final-state interaction of the proton, a
microscopic nuclear matter calculation of the damping of this proton, and
high-quality quasihole wave functions for $p$-shell nucleons in ${}^{16}{\rm
O}$. Good agreement with the $Q^2 = 0.8$ (GeV/$c)^2$ data is obtained when
spectroscopic factors are employed which are identical to those required to
describe earlier low $Q^2$ experiments.


title: Aspects of a0-f0 mixing in the reaction pn->da0

abstract:
  Some aspects of a0-f0 mixing effects in the reaction ${\vec p} n\to da^0_0$
with perpendicular polarized proton beam are discussed. An angular--asymmetry
parameter $A$ is defined to study those effects. It is shown that, for energies
close to the production threshold, the angular--asymmetry parameter $A(\theta,
\phi)$ is proportional to the a0-f0 mixing amplitude for arbitrary polar and
azimuthal angles $\theta$ and $\phi$ of the outgoing $a_0$ meson. This
statement is also valid for arbitrary energies, but then only at polar angles
$\theta=0^0$ and $\theta=90^0$. The mass dependence of the differential cross
section $d\sigma/dm_{\pi^0\eta}$ in the reaction $pn\to d\pi^0\eta$ in the
presence of \mix mixing is also discussed.


title: Color Glass Condensate at RHIC ?

abstract:
  Heavy-ion collisions at the BNL-RHIC collider can probe whether gluon
saturation effects in nuclei at small x have set in, or whether leading-twist
perturbative estimates of particle production are still applicable. I discuss
that soon to come data from pA collisions at RHIC may provide more systematic
insight into this problem than present data on the energy and centrality
dependence of hadron production from Au+Au collisions. Results from pA
collisions at RHIC could also help to understand some controversial and
puzzling results from ion-ion collisions, for example the large azimuthal
asymmetry at high p_t, as measured by the STAR collaboration.


title: Faddeev-Yakubovsky calculations for light Lambda-Lambda hypernuclei

abstract:
  New Faddeev-Yakubovsky calculations are reported for Lambda-Lambda-6He and
Lambda-Lambda-10Be in terms of clusters of alpha's and Lambda's, using
Lambda-Lambda s-wave potentials motivated by several of the Nijmegen model
interactions. The self consistency of the Lambda-Lambda hypernuclear world data
for these species is discussed. The newly reported Lambda-Lambda-6He event is
found to be compatible with Lambda-Lambda interaction strengths provided by the
Nijmegen soft-core one-boson-exchange model NSC97. Faddeev calculations for
Lambda-Lambda-5H and Lambda-Lambda-5He suggest that these Lambda-Lambda
hypernuclei are stable against emitting Lambda's for any (essentially
attractive) Lambda-Lambda interaction, whereas calcualtions for
Lambda-Lambda-4H do not allow a clear-cut conclusion whether or not it is
particle stable.


title: Nuclear Mean Fields through Selfconsistent Semiclassical Calculations

abstract:
  Semiclassical expansions derived in the framework of the Extended
Thomas-Fermi approach for the kinetic energy density tau(r) and the spin-orbit
density J(r) as functions of the local density rho(r) are used to determine the
central nuclear potentials V_n(r) and V_p(r) of the neutron and proton
distribution for effective interactions of the Skyrme type. We demonstrate that
the convergence of the resulting semiclassical expansions for these potentials
is fast and that they reproduce quite accurately the corresponding Hartree-Fock
average fields.


title:
Mean-Field and Pairing Properties of Exotic Nuclei: Exploring the
  Nuclear Landscape

abstract:
  In years to come, we shall see substantial progress in our understanding of
nuclear structure - a rich and many-faceted field. An important element in this
task will be to extend the study of nuclei into new domains. The journey to
'the limits' of isospin, angular momentum, and mass and charge is a quest for
new and unexpected phenomena which await us in uncharted territories. What is
extremely important from a theoretical point of view is that the new data are
also expected to bring qualitatively new information about the effective
nucleon-nucleon interaction and hence about the fundamental properties of the
nucleonic many-body system. The main objective of this presentation is to
discuss some of the challenges and opportunities for nuclear structure research
with radioactive nuclear beams.


title: Incoherent Eta Photoproduction from the Deuteron near Threshold

abstract:
  Very recent data for the reaction gamma+d ->eta np, namely total cross
sections, angular and momentum spectra, are analyzed within a model that
includes contributions from the impulse approximation and next order
corrections due to the np and eta-N interactions in the final state. Comparison
between the calculations and the new data indicate sizable contributions from
the np and eta-N final state interactions. Some systematic discrepancies
between the calculations and the data are also found.


title: Building light nuclei from neutrons, protons, and pions

abstract:
  In these lectures I first explain, in a rather basic fashion, the
construction of effective field theories. I then discuss some recent
developments in the application of such theories to two- and three-nucleon
systems.


title:
Ground-state correlations and final state interactions in the process
  3He(e,e'pp)n

abstract:
  The two-proton emission process $^3He(e,e'pp)n$ is theoretically investigated
using realistic three-nucleon wave functions and taking the final state
interaction into account by an approach which can be used when the value of the
three-nucleon invariant mass is either below or above the pion emission
threshold. Various kinematical conditions which enhance or minimize the effects
of the final state interaction are thoroughly analyzed.


title:
Construction of Non-Perturbative, Unitary Particle-Antiparticle
  Amplitudes for Finite Particle Number Scattering Formalisms

abstract:
  Starting from a unitary, Lorentz invariant two-particle scattering amplitude
, we show how to use an identification and replacement process to construct a
unique, unitary particle-antiparticle amplitude. This process differs from
conventional on-shell Mandelstam s,t,u crossing in that the input and
constructed amplitudes can be off-diagonal and off-energy shell. Further,
amplitudes are constructed using the invariant parameters which are appropriate
to use as driving terms in the multi-particle, multichannel non-perturbative,
cluster decomposable, relativistic scattering equations of the Faddeev-type
integral equations recently presented by Alfred, Kwizera, Lindesay and Noyes.
It is therefore anticipated that when so employed, the resulting multi-channel
solutions will also be unitary. The process preserves the usual
particle-antiparticle symmetries. To illustrate this process, we construct a
J=0 scattering length model chosen for simplicity. We also exhibit a class of
physical models which contain a finite quantum mass parameter and are Lorentz
invariant. These are constructed to reduce in the appropriate limits, and with
the proper choice of value and sign of the interaction parameter, to the
asymptotic solution of the non-relativistic Coulomb problem, including the
forward scattering singularity, the essential singularity in the phase, and the
Bohr bound-state spectrum.


title: Diffusion processes with Non-Markovian Transport Coefficients

abstract:
  Employing time-dependent projection formalism, a Fokker-Planck equation with
non-Markovian transport coefficients is derived for large amplitude collective
motion. Properties of transport coefficients for diffusion processes in a
potential well and along a potential barrier are discussed, and their
connection with the fluctuation-dissipation theorem is investigated. In the
case of diffusion in a potential well, the formalism naturally leads to the
generalization of the well known Einstein relation by including quantum
fluctuations in addition to thermal fluctuations. Furthermore, it is shown that
at low temperatures diffusion along potential barrier is significantly modified
by quantum fluctuations. Explicit expressions for transport coefficients are
presented for the case of the Caldeira-Leggett model.


title:
Coherent $\omega$ photoproduction from nuclei and $\omega$ properties in
  nuclear matter

abstract:
  The coherent $\omega$-meson photoproduction from nuclei is proposed as a
phenomenological method to evaluate the momentum dependence of $\omega$-meson
mass shift and width in nuclear matter. We analyze available data on
un-separated coherent and incoherent $\omega$-meson photoproduction from nuclei
and extract the imaginary part of the the complex forward $\omega{N}$
scattering amplitude, which is proportional to the in-medium $\omega$-meson
width. The accuracy of the currently available data is not sufficient to
evaluate the real part of forward $\omega{N}$ scattering amplitude and
reconstruct the momentum dependence of the mass shift of the $\omega$-meson.


title: Nuclear absorption and $J/\psi$ suppression in Pb+Pb collisions

abstract:
  We have analyzed the NA58 data on $J/\psi$ suppression in Pb+Pb collisions.
$J/\psi$ production is assumed to be a two step process, (i) formation of
$c\bar{c}$ pair, which is accurately calculable in QCD and (ii) formation of
$J/\psi$ meson from the $c\bar{c}$ pair, which can be conveniently
parameterized. In a pA/AA collision, a $c\bar{c}$ pair gain relative square
momentum as it passes through the nuclear medium and some of the $c\bar{c}$
pairs can gain enough momentum to cross the threshold to become an open charm
meson, leading to suppression in pA/AA collisions. A new prescription is
proposed for the gain in momentum square, consistent with Krammer process. The
model without any free parameter could explain the $E_T$ dependence of $J/\psi$
over Drell-Yan ratio.


title: Superfluid Phases of Triplet Pairing

abstract:
  The phase transitions in dense neutron matter with triplet pairing have been
investigated. The spectrum of phases of the $^3P_2$-$^3F_2$ model, which
adequately describes pairing in this system, is identified and classified with
the aid of a separation method for solving BCS gap equations associated with
pairing states of arbitrary angular-momentum content. In addition to usual
solutions involving a single value of the magnetic quantum number (and its
negative), there exist ten real multicomponent solutions. Five of the
corresponding angle-dependent order parameters have nodes, and five do not. In
contrast to the case of superfluid $^3$He, transitions occur between phases
with nodeless order parameters. Results for the temperature dependence of the
competition between the various phases have been obtained.


title:
Trinucleon Photo Reactions with ${\Delta}$-Isobar Excitation: Radiative
  Nucleon-Deuteron Capture and Two-Body Photo Disintegration of the
  Three-Nucleon Bound State

abstract:
  Radiative nucleon-deuteron capture and photo disintegration of the
three-nucleo n bound state with two-body final states are described. The
description uses nucleon degrees of freedom extended to include the excitation
of a single nucleon to a \diso. The baryonic interaction and the
electromagnetic cu rrent couple nucleonic states and states with a \diso. Exact
solutions of three-p article scattering equations are employed for the initial
or final states of the reactions. The current has one-baryon and two-baryon
contributions. The role of t he \diso in the description of the considered
photo reactions is discussed and fo und to be moderate. The spin observables
$A_{yy}$ and $T_{20}$ at $90^{\circ}$ la b scattering angle can be calculated
model-independently from the $E1$ Siegert te rm in the long-wavelength limit.


title:
Interaction induced deformation in momentum distribution of spin
  polarized nuclear matter

abstract:
  Effects of spin polarization on the structure of symmetric nuclear matter and
pure neutron matter are investigated. We show that the spin polarization
induces a deformation of the Fermi spheres for nucleons with spin parallel and
opposite to the polarization axes. This feature can be related to the structure
of the one pion exchange contribution to a realistic nucleon-nucleon
interaction. While the anisotropies in the momentum distribution lower the
energy of the system by small amount, the associated variations of the single
particle energies with the angle between the polarization axis and the particle
momentum are significant.


title: Dynamical properties of constrained drops

abstract:
  In this communication we analyze the behavior of excited drops contained in
spherical volumes. We study different properties of the dynamical systems i.e.
the maximum Lyapunov exponent MLE, the asymptotic distance in momentum space
$d_{\infty}$ andthe normalized variance of the maximum fragment NVM. It is
shown that the constrained systems behaves as undergoing a first order phase
transition at low densities while as a second order one at high densities. The
transition from liquid-like to vapor-like behavior is signaled both by the
caloric curves, thermal response functions and the MLE. The relationship
between $MLE,d_{\infty}$, and the CC is explored.


title: Classical Drop Phase Diagram and Cluster Distributions

abstract:
  The phase diagram, ($T,\rho$), of a finite, constrained, and classical system
is built from the analysis of cluster distributions in phase and
configurational space. The obtained phase diagram can be split in three
regions. One, low density limit, in which first order phase transition features
can be observed. Another one, corresponding to the high density regime, in
which fragments in phase space display critical behavior of 3D-Ising
universality class type. And an intermediate density region, in which
power-laws are displayed but can not be associated to the abovementioned
universality class.


title: Predictive Ability of QCD Sum Rules for Excited Baryons

abstract:
  The masses of octet baryons are calculated by the method of QCD sum rules.
Using generalized interpolating fields, three independent sets of QCD sum rules
are derived which allow the extraction of low-lying N* states with spin-parity
1/2+, 1/2- and 3/2- in both the non-strange and strange channels. The
predictive ability of the sum rules is examined by a Monte-Carlo based analysis
procedure in which the three phenomenological parameters (mass, coupling,
threshold) are treated as free parameters simultaneously. Realistic
uncertainties in these parameters are obtained by simultaneously exploring all
uncertainties in the QCD input parameters. Those sum rules with good predictive
power are identified and their predictions are compared with experiment where
available.


title: Hadron formation in high energy photonuclear reactions

abstract:
  We present a new method to account for coherence length effects in a
semi-classical transport model. This allows us to describe photo- and
electroproduction at large nuclei (A>12) and high energies using a realistic
coupled channel description of the final state interactions that goes beyond
simple Glauber theory. We show that the purely absorptive treatment of the
final state interactions can lead to wrong estimates of color transparency and
formation time effects in particle production. As an example, we discuss
exclusive rho^0 photoproduction on Pb at a photon energy of 7 GeV as well as
K^+ production in the photon energy range 1-7 GeV.


title: Assocative Photoproduction of Roper Resonance and $\omega$-Meson

abstract:
  Associative photoproduction of $\omega$-meson and $N^{*}(1440)$ on nucleons,
$\gamma+N\to\omega+N^{*}(1440)$, in the near threshold region is investigated
in a framework employing effective Lagrangians. Besides $\pi$-exchange in
t-channel, baryon exchanges, i.e. N- and $N^{*}$-exchanges, in the s- and
u-channels are also taken into account in calculations of differential
cross-section and beam asymmetry. Important inputs of this model are the vector
and tensor coupling constants of $\omega NN^{*}(1440)$-vertex, which are
assumed to be equal to the values of these couplings for $\omega NN$ vertex.
Using our previous estimation of $\omega NN$ coupling constants obtained from a
fit to available experimental data on photoproduction of $\omega$ meson in the
near threshold region, we produce the necessary numerical predictions for
different observables in $\gamma+N\to\omega+N^{*}(1440)$. Numerical results
shows that at low $|$t$|$ dominant contribution comes from t-channel
$\pi$-exchange while effects of nucleon and $N^{*}(1440)$ pole terms can be
seen at large $|t|$. Our predictions for the differential cross section and
beam asymmetry for the processes $\gamma+N\to\omega+N^{*}(1440)$, where N is
proton and neutron at $E_{\gamma}=2.5$ GeV are presented with zero width
approximation and also with the inclusion of width effects of $N^{*}(1440)$.


title:
Fano theory for hadronic resonances: the rho meson and the pionic
  continuum

abstract:
  We develop a model-independent analysis of hadronic scattering data in the
resonance region, where the resonance shape follows from the matrix elements of
a Hamiltonian. We investigate the rho meson in the tau decay. We demonstrate
that the rho meson resonance in the two-pion decay of the tau lepton is
described well through the coupling of a bare rho meson to the two-pion and the
four-pion continuum. Furthermore, this four-pion continuum corresponds with the
data of the four-pion decay channel of the tau lepton at energies up to 1.1
GeV.


title: Effective Field Theory for Few-Nucleon Systems

abstract:
  We review the effective field theories (EFTs) developed for few-nucleon
systems. These EFTs are controlled expansions in momenta, where certain
(leading-order) interactions are summed to all orders. At low energies, an EFT
with only contact interactions allows a detailed analysis of renormalization in
a non-perturbative context and uncovers novel asymptotic behavior. Manifestly
model-independent calculations can be carried out to high orders, leading to
high precision. At higher energies, an EFT that includes pion fields justifies
and extends the traditional framework of phenomenological potentials. The
correct treatment of QCD symmetries ensures a connection with lattice QCD.
Several tests and prospects of these EFTs are discussed.


title:
Continuum quasiparticle random phase approximation and the time
  dependent Hartree-Fock-Bogoliubov approach

abstract:
  Quadrupole excitations of neutron-rich nuclei are analyzed by using the
linear response method in the Quasiparticle Random Phase Approximation (QRPA).
The QRPA response is derived starting from the time-dependent
Hartree-Fock-Bogoliubov (HFB) equations. The residual interaction between the
quasiparticles is determined consistently from the two-body force used in the
HFB equations, and the continuum coupling is treated exactly.
  Calculations are done for the neutron-rich oxygen isotopes. It is found that
pairing correlations affect the low-lying states, and that a full treatment of
the continuum can change the structure of the states in the giant resonance
region.


title: Selfconsistent calculations of fission barriers in the Fm region

abstract:
  The fission barriers of the nuclei 254Fm, 256Fm, 258Fm, 258No and 260Rf are
investigated in a fully microscopic way up to the scission point. The analysis
is based on the constrained Hartree-Fock-Bogoliubov theory and Gogny's D1S
force. The quadrupole, octupole and hexadecapole moments as well as the number
of nucleons in the neck region are used as constraints. Two fission paths,
corresponding to the bimodal fission, are found. The decrease with isotope mass
of the half-life times of heavy Fm isotopes is also explained.


title: Explanation of the RHIC pt-spectra in a single-freeze-out model

abstract:
  The pt-spectra of hadrons measured at RHIC are very well described in a model
which assumes that the chemical and thermal freeze-outs occur simultaneously.
The model calculation includes all hadronic resonances and uses a simple
parametrization of the freeze-out hypersurface.


title:
On pressure versus density dependence in statistical multifragmentation
  models

abstract:
  We show that the statistical multifragmentation model with the standard
parameterization of the free volume predicts a constant pressure as density
approaches the normal nuclear density. This is contrary to the Raduta&Raduta
result obtained by disregarding the center of mass constraint. It is
demonstrated that in finite nuclear systems the partitions with small number of
fragments play an important role.


title: Nuclear ground-state properties from mean-field calculations

abstract:
  The volume and surface effects in the nuclear local energy density and the
volume and surface components of the pairing interaction are discussed in the
context of the mean-field, Hartree-Fock-Bogoliubov description of atomic
nuclei. Predictions of properties of exotic nuclei close to the particle drip
lines are presented.


title:
Equation of state and magnetic susceptibility of spin polarized isospin
  asymmetric nuclear matter

abstract:
  Properties of spin polarized isospin asymmetric nuclear matter are studied
within the framework of the Brueckner--Hartree--Fock formalism. The
single-particle potentials of neutrons and protons with spin up and down are
determined for several values of the neutron and proton spin polarizations and
the asymmetry parameter. It is found an almost linear and symmetric variation
of the single-particle potentials as increasing these parameters. An analytic
parametrization of the total energy per particle as a function of the asymmetry
and spin polarizations is constructed. This parametrization is employed to
compute the magnetic susceptibility of nuclear matter for several values of the
asymmetry from neutron to symmetric matter. The results show no indication of a
ferromagnetic transition at any density for any asymmetry of nuclear matter.


title:
Aspects of Coulomb Dissociation and Interference in Peripheral
  Nucleus-Nucleus Collisions

abstract:
  Coherent vector meson production in peripheral nucleus-nucleus collisions is
discussed. These interactions may occur for impact parameters much larger than
the sum of the nuclear radii. Since the vector meson production is always
localized to one of the nuclei, the system acts as a two-source interferometer
in the transverse plane. By tagging the outgoing nuclei for Coulomb
dissociation it is possible to obtain a measure of the impact parameter and
thus the source separation in the interferometer. This is of particular
interest since the life-time of the vector mesons are generally much shorter
than the impact parameters of the collisions.


title: Theoretical developments in heavy nuclei

abstract:
  The present-day nuclear structure theory exhibits a great degree of synergy
with respect to methods that are used to describe various phenomena in heavy
nuclear systems. From few-body methods, through the shell model to mean-field
approaches, the bridges are being built between different ways of describing
the stable as well as the most exotic nuclei. In the present talk, I give a
review of several selected subjects that are currently at the fore front of new
developments in this domain of nuclear science.


title: Cluster emission and phase transition behaviours in nuclear disassembly

abstract:
  The features of the emissions of light particles (LP), charged particles
(CP), intermediate mass fragments (IMF) and the largest fragment (MAX) are
investigated for $^{129}Xe$ as functions of temperature and 'freeze-out'
density in the frameworks of the isospin-dependent lattice gas model and the
classical molecular dynamics model. Definite turning points for the slopes of
average multiplicity of LP, CP and IMF, and of the mean mass of the largest
fragment ($A_{max}$) are shown around a liquid-gas phase transition temperature
and while the largest variances of the distributions of LP, CP, IMF and MAX
appear there. It indicates that the cluster emission rate can be taken as a
probe of nuclear liquid--gas phase transition. Furthermore, the largest
fluctuation is simultaneously accompanied at the point of the phase transition
as can be noted by investigating both the variances of their cluster
multiplicity or mass distributions and the Campi scatter plots within the
lattice gas model and the molecular dynamics model, which is consistent with
the result of the traditional thermodynamical theory when a phase transition
occurs.


title: Statistical nature of cluster emission in nuclear liquid phase

abstract:
  The emission of nuclear clusters is investigated within the framework of
isospin dependent lattice gas model and classical molecular dynamics model. It
is found that the emission of individual cluster which is heavier than proton
is almost Poissonian except near the liquid gas phase transition point and the
thermal scaling is observed by the linear Arrhenius plots which is made from
the average multiplicity of each cluster versus the inverse of temperature in
the nuclear liquid phase. It indicates of a statistical nature of such cluster
emission in the models. The "emission barriers" which are the slopes of the
Arrhenius plots are extracted as a function of the mass or charge number and
fitted by the formula embodied with the contributions of the surface energy and
Coulomb interaction. The possible influences of the source size, Coulomb
interaction and "freeze-out" density and related physical implications are
discussed.


title: The exotic double-charge exchange muon positron conversion in nuclei

abstract:
  The formalism for the neutrinoless muon positron conversion is investigated
in detail and the relevant nuclear matrix elements for light intermediate
neutrinos in the case of the experimentally interesting A=27 system are
calculated. The nucleus is going to be used as a stopping target in the MECO
experiment at Brookhaven, one of the most sensitive probes expected to reach a
sensitivity in the branching ratio within the next few years, which will be an
improvement of three orders of magnitude. The relevant transition operators are
constructed utilizing a variety of mechanisms present in current gauge
theories, with emphasis on the intermediate neutrinos, both light and heavy,
and heavy SUSY particles. The nuclear wave functions, both for the initial
state and all excited final states are obtained in the framework of 1s-0d shell
model employing the well-known and tested Wildenthal realistic interaction. In
the case of the light intermediate neutrinos the transition rates to all
excited final states up to 25 MeV in energy are calculated. We find that the
imaginary part of the amplitude is dominant. The total rate is calculated by
summing over all these partial transition strengths. We also find that the rate
due to the real part of the amplitude is much smaller than the corresponding
quantity found previously by the closure approximation.


title:
Direct photons from relativistic heavy ion collisions at CERN SPS and at
  RHIC

abstract:
  Assuming QGP as the initial state, we have analyzed the direct photon data,
obtained by the WA98 collaboration, in 158 A GeV Pb+Pb collisions at CERN SPS.
It was shown, that for small thermalisation time, two loop rate contribute
substantially to high $p_T$ photons. We argue that for extremely short
thermalisation time scale, the higher loop contribution should not be
neglected. For thermalisation time 0.4 fm or greater, when higher loop
contribution are not substantial, the initial temperature of the QGP is not
large and the system does not produce enough hard $p_T$ photons to fit the WA98
experiment. For initial time in the ranges of 0.4-1.0 fm, WA98 data could be
fitted only if the fluid has initial radial velocity in the range of 0.3-0.5c.
The model was applied to predict photon spectrum at RHIC energy.


title:
Role of Delta exchange for proton-antiproton annihilation into two-pion
  and three-pion channels

abstract:
  Proton-antiproton annihilation into two pions and three pions is studied in a
baryon-exchange model. Annihilation diagrams involving nucleon as well as
Delta-resonance exchanges are included consistently in the two- and three-pion
channels. Effects from the initial-state interaction are fully taken into
account. A comparison of the influence of the Delta exchange on the considered
annihilation channels is made and reveals that its importance for three-pion
annihilation is strongly reduced as compared to two-pion annihilation. It is
found that annihilation into three uncorrelated pions can yield up to 10 % of
the total experimentally observed three-pion annihilation cross section.


title: Bethe-Salpeter approach with the separable interaction for the deuteron

abstract:
  Recent developments of the covariant Bethe-Salpeter (BS) approach with the
use of the separable interaction for the deuteron are reviewed. It is shown
that the BS formalism allows a covariant description of various electromagnetic
reactions like the lepton-deuteron scattering, deuteron electro-disintegration,
deep inelastic scattering (DIS) of leptons on light nuclei. The procedure of
the construction of the separable nucleon-nucleon (NN) interaction is
discussed. The BS formalism facilitates analysis of the role of the P-waves
(negative energy components) in the electromagnetic properties of the deuteron
and its comparison with the nonrelativistic results. Furthermore the covariant
BS approach makes it possible to analyze DIS of leptons from the deuteron in a
model independent way and to extend the formalism to DIS reactions on the light
nuclei.


title:
An alternative way of plotting the data and results of models of J/psi
  suppression

abstract:
  We propose an alternative way of looking at data on anomalous J/psi
suppression. The proposed method is in principle equivalent to the one used by
the NA50 Collaboration, but it permits to visualize separate contributions of
individual processes responsible for the disintegration of J/psi's produced by
a hard process in nuclear collisions. The method can be used provided that the
time sequence of contributing mechanisms is known or assumed. It offers an
alternative graphical presentation of the onset of anomalous J/psi suppression
in Pb-Pb interactions observed by the NA50 Collaboration at the CERN SPS and
might contribute to explain why different mechanisms, such as J/psi suppression
by the Quark-Gluon Plasma and by co-movers in the Dual Parton Model or in Monte
Carlo microscopic approaches, all lead to an approximate description of
anomalous J/psi suppression.


title: Nuclear weak-interaction processes in stars

abstract:
  Recent experimental data and progress in nuclear structure modeling have lead
to improved descriptions of astrophysically important weak-interaction
processes. The review discusses these advances and their applications to
hydrostatic solar and stellar burning, to the slow and rapid neutron-capture
processes, to neutrino nucleosynthesis, and to explosive hydrogen burning.
Special emphasis is given to the weak-interaction processes associated with
core-collapse supernovae. Despite some significant progress, important
improvements are still warranted. Such improvements are expected to come from
future radioactive ion-beam facilities.


title: The algebraic cluster model. Three-body clusters

abstract:
  A new method is introduced to study three-body clusters. Triangular
configurations with ${\cal D}_{3h}$ point-group symmetry are analyzed. The
spectrum, transition form factors and $B(E\lambda)$ values of $^{12}$C are
investigated. It is concluded that the low-lying spectrum of $^{12}$C can be
described by three alpha-particles at the vertices of an equilateral triangle,
but not as a rigid structure. Large rotation-vibration interactions, Coriolis
forces and vibration-vibration interactions are needed. Other interpretations,
such as the harmonic oscillator and a soft deformed oscillator with SO(6)
hyperspherical symmetry, appear to be excluded by electron scattering data.


title: Nucleon mass and pion loops: Renormalization

abstract:
  Using Dyson--Schwinger equations, the nucleon propagator is analyzed
nonperturbatively in a field--theoretical model for the pion--nucleon
interaction. Infinities are circumvented by using pion--nucleon form factors
which define the physical scale. It is shown that the correct, finite,
on--shell nucleon renormalization is important for the value of the mass--shift
and the propagator. For physically acceptable forms of the pion--nucleon form
factor the rainbow approximation together with renormalization is inconsistent.
Going beyond the rainbow approximation, the full pion--nucleon vertex is
modelled by its bare part plus a one--loop correction including an effective
$\Delta$. It is found that a consistent value for the nucleon mass--shift can
be obtained as a consequence of a subtle interplay between wave function and
vertex renormalization. Furthermore, the bare and renormalized pion--nucleon
coupling constant are approximately equal, consistent with results from the
Cloudy Bag Model.


title:
Large-scale QRPA calculation of E1-strength and its impact on the
  neutron capture cross section

abstract:
  Large-scale QRPA calculations of the E1-strength are performed as a first
attempt to microscopically derive the radiative neutron capture cross sections
for the whole nuclear chart. A folding procedure is applied to the QRPA
strength distribution to take the damping of the collective motion into
account. It is shown that the resulting E1-strength function based on the SLy4
Skyrme force is in close agreement with photoabsorption data as well as the
available experimental E1-strength at low energies. The increase of the
E1-strength at low energies for neutron-rich nuclei is qualitatively analyzed
and shown to affect the corresponding radiative neutron capture cross section
significantly. A complete set of E1-strength function is made available for
practical applications in a table format for all 7<Z<111 nuclei lying between
the proton and the neutron drip lines.


title:
Differences in high p_t meson production between CERN SPS and RHIC heavy
  ion collisions

abstract:
  In this talk we present a perturbative QCD improved parton model calculation
for light meson production in high energy heavy ion collisions. In order to
describe the experimental data properly, one needs to augment the standard pQCD
model by the transverse momentum distribution of partons ("intrinsic k_T").
Proton-nucleus data indicate the presence of nuclear shadowing and
multiscattering effects. Further corrections are needed in nucleus-nucleus
collisions to explain the observed reduction of the cross section. We introduce
the idea of proton dissociation and compare our calculations with the SPS and
RHIC experimental data.


title: On the temperature dependence of the symmetry energy

abstract:
  We perform large-scale shell model Monte Carlo (SMMC) calculations for many
nuclei in the mass range A=56-65 in the complete pfg_{9/2}d_{5/2} model space
using an effective quadrupole-quadrupole+pairing residual interaction. Our
calculations are performed at finite temperatures between T=0.33-2 MeV. Our
main focus is the temperature dependence of the symmetry energy which we
determine from the energy differences between various isobaric pairs with the
same pairing structure and at different temperatures. Our SMMC studies are
consistent with an increase of the symmetry energy with temperature. We also
investigate possible consequences for core-collapse supernovae events.


title: Compton Scattering on the Proton

abstract:
  A microscopic coupled-channels model for Compton and pion scattering off the
nucleon is introduced which is applicable at the lowest energies
(polarizabilities) as well as at GeV energies. To introduce the model first the
conventional K-matrix approach is discussed to extend this in a following
chapter to the "Dressed K-Matrix" model. The latter approach restores
causality, or analyticity, of the amplitude to a large extent. In particular,
crossing symmetry, gauge invariance and unitarity are satisfied. The extent of
violation of analyticity (causality) is used as an expansion parameter.


title: Virtual-pion and two-photon production in pp scattering

abstract:
  Two-photon production in pp scattering is proposed as a means of studying
virtual-pion emission. Such a process is complementary to real-pion emission in
pp scattering. The virtual-pion signal is embedded in a background of
double-photon bremsstrahlung. We have developed a model to describe this
background process and show that in certain parts of phase space the
virtual-pion signal gives significant contribution. In addition, through
interference with the two-photon bremsstrahlung background, one can determine
the relative phase of the virtual-pion process.


title: Coupling to the continuous spectrum and HFB approximation

abstract:
  We propose a new method to solve the Hartree-Fock-Bogoliubov equations for
weakly bound nuclei whose purpose is to improve the treatment of the continuum
when a finite range two-body interaction is used. We replace the traditional
expansion on a discrete harmonic oscillator basis by a mixed eigenfunction
expansion associated with a potential that explicitely includes a continuous
spectrum. We overcome the problem of continuous spectrum discretization by
using a resonance expansion.


title: Radiative capture of polarized neutrons by polarized protons

abstract:
  A model-independent irreducible tensor approach to p(n,gamma)d is presented
and an explicit form for the spin-structure of the matrix for the reaction is
obtained in terms of the Pauli spin-matrices for the neutron and the proton.
Expressing the multipole amplitudes in terms of the triplet --> triplet and
singlet --> triplet transitions, we point out how the initial singlet and
triplet contributions to the differential cross section can be determined
empirically.


title:
Effect of recent R_p and R_n measurements on extended Gari-Krumpelmann
  model fits to nucleon electromagnetic form factors

abstract:
  The Gari-Krumpelmann (GK) models of nucleon electromagnetic form factors, in
which the rho, omega, and phi vector meson pole contributions evolve at high
momentum transfer to conform to the predictions of perturbative QCD (pQCD), was
recently extended to include the width of the rho meson by substituting the
result of dispersion relations for the pole and the addition of rho' (1450)
isovector vector meson pole. This extended model was shown to produce a good
overall fit to all the available nucleon electromagnetic form factor (emff)
data. Since then new polarization data shows that the electric to magnetic
ratios R_p and R_n obtained are not consistent with the older G_{Ep} and G_{En}
data in their range of momentum transfer. The model is further extended to
include the omega' (1419) isoscalar vector meson pole. It is found that while
this GKex cannot simultaneously fit the new R_p and the old G_{En} data, it can
fit the new R_p and R_n well simultaneously. An excellent fit to all the
remaining data is obtained when the inconsistent G_{Ep} and G_{En} is omitted.
The model predictions are shown up to momentum transfer squared, Q^2, of 8
GeV^2/c^2.


title:
Gauge and Lorentz invariant one-pion exchange currents in electron
  scattering from a relativistic Fermi gas

abstract:
  A consistent analysis of relativistic pionic correlations and meson-exchange
currents for electroweak quasielastic electron scattering from nuclei is
carried out. Fully-relativistic one-pion-exchange electromagnetic operators are
developed for use in one-particle emission electronuclear reactions within the
context of the relativistic Fermi gas model. Then the exchange and pionic
correlation currents are set up fully respecting the gauge invariance of the
theory. Emphasis is placed on the self-energy current which, being infinite,
needs to be renormalized. This is achieved starting in the Hartree-Fock
framework and then expanding the Hartree-Fock current to first order in the
square of the pion coupling constant to obtain a truly, gauge invariant,
one-pion-exchange current. The model is applied to the calculation of the
parity-conserving (PC) and parity-violating (PV) inclusive responses of nuclei.
Interestingly, in the pionic correlations terms exist which arise uniquely from
relativity, although their impact on the responses is found to be modest.


title: (^{8})B breakup in elastic and transfer reactions

abstract:
  We have studied the transfer reaction $^{14}$N($^7$Be,$^8$B)$^{13}$C at
(\mathrm{E}_{\mathrm{lab}}=84) MeV, paying special attention to the effects of
the coupling to the continuum in the exit channel. Using the Continuum
Discretized Coupled Channels (CDCC) formalism, we find that these effects are
important for the description of the elastic scattering observables. However,
for the transfer process, differences between the predictions of the
differential cross section within the Distorted Wave Born Approximation (DWBA)
and the CDCC-Born approximation (CDCC-BA) are found to be negligible. This
result supports the use of the DWBA method as a reliable tool to extract the
$S_{17}(0)$ factor in this case.


title: Thermal Lepton Production in Heavy-Ion Collisions

abstract:
  The current status of evaluating thermal production of lepton pairs in
high-energy collisions of heavy nuclei is discussed. After a brief survey of
emission rates from hot and dense matter, we address applications to (and
interpretations of) recent SPS data including 40 AGeV CERES results, as well as
prospects for NA60. Emphasis is put on predictions for RHIC. In particular,
implications of hadronic observables and first single-electron measurements at
$\sqrt{s}=130$ AGeV for upcoming pair spectra from PHENIX at $\sqrt{s}=200$
AGeV are assessed.


title: Can we observe the $\sigma$ meson in peripheral heavy ion collisions?

abstract:
  We discuss the possible production of the $\sigma$ meson and detection of its
two photon decay mode in peripheral heavy ion collisions at RHIC. Assuming the
mass and total decay width values reported recently by the E791 Collaboration,
we verify that the $\sigma$ meson can be observed in the subprocess $\gamma
\gamma \to \gamma \gamma$ if its partial decay width into photons is of the
order of a few keV.


title:
Compatibility of localized wave packets and unrestricted single particle
  dynamics for cluster formation in nuclear collisions

abstract:
  Antisymmetrized molecular dynamics with quantum branching is generalized so
as to allow finite time duration of the unrestricted coherent mean field
propagation which is followed by the decoherence into wave packets. In this new
model, the wave packet shrinking by the mean field propagation is respected as
well as the diffusion, so that it predicts a one-body dynamics similar to that
in mean field models. The shrinking effect is expected to change the diffusion
property of nucleons in nuclear matter and the global one-body dynamics. The
central $\xenon+\tin$ collisions at 50 MeV/nucleon are calculated by the models
with and without shrinking, and it is shown that the inclusion of the wave
packet shrinking has a large effect on the multifragmentation in a big
expanding system with a moderate expansion velocity.


title: Exact two-particle eigenstates in partially reduced QED

abstract:
  We consider a reformulation of QED in which covariant Green functions are
used to solve for the electromagnetic field in terms of the fermion fields. It
is shown that exact few-fermion eigenstates of the resulting Hamiltonian can be
obtained in the canonical equal-time formalism for the case where there are no
free photons. These eigenstates lead to two- and three-body Dirac-like
equations with electromagnetic interactions. Perturbative and some numerical
solutions of the two-body equations are presented for positronium and
muonium-like systems, for various strengths of the coupling.


title:
Folding model analysis of elastic and inelastic proton scattering on
  Sulfur isotopes

abstract:
  The folding formalism for the nucleon-nucleus optical potential and inelastic
form factor is applied to study elastic and inelastic proton scattering on
30-40S isotopes. A recently developed realistic density dependent M3Y
interaction, well tested in the folding analysis of nucleus-nucleus elastic and
inelastic scattering, is used as effective NN interaction. The nuclear ground
state and transition densities (for the 2+ excitations in Sulfur isotopes) are
obtained in the Hartree-Fock-BCS and QRPA approaches, respectively. The best
fit ratios of transition moments Mn/Mp for the lowest 2+ states in Sulfur
isotopes are compared to those obtained earlier in the DWBA analysis of the
same data using the same structure model and inelastic form factors obtained
with the JLM effective interaction. Our folding+DWBA analysis has shown quite a
strong isovector mixing in the elastic and inelastic scattering channels for
the neutron rich 38,40S nuclei. In particular, the relative strength of the
isovector part of the transition potential required by the inelastic p+38S data
is significantly stronger than that obtained with the corresponding QRPA
transition density.


title: Revisiting the Hugenholtz-Van Hove theorem in nuclear matter

abstract:
  An assessment of the magnitude of the rearrangement contribution to the Fermi
energy and to the binding energy per particle is carried out in symmetric
nuclear matter by extending the G-matrix framework. The restoration of the
thermodynamic consistency or, equivalently, the fulfillment of the
Hugenholtz-Van Hove theorem, is discussed.


title: Event-by-event fluctuations in heavy ion collisions

abstract:
  We discuss the physics underlying event-by-event fluctuations in relativistic
heavy ion collisions. We will argue that the fluctuations of the ratio of
positively over negatively charged particles may serve as a unique signature
for the Quark Gluon Plasma.


title:
A microscopic description for the alpha decay of nuclei using a
  realistic effective interaction

abstract:
  The process of alpha disintegration has been studied theoretically in the
framework of a microscopic superasymmetric fission model (MSAFM). The nuclear
interaction potential required for the alpha decay process has been calculated
by folding in the density distribution functions of the alpha nucleus and the
daughter nucleus with a realistic effective interaction. The nuclear
microscopic alpha-nucleus potential thus obtained has been used along with the
Coulomb interaction potential to calculate the action integral within the WKB
approximation. This subsequently results in a parameter free calculation for
the half lives of the alpha decays of nuclei. The model is successful in
calculating the half lives of the alpha disintegration processes of nuclei.


title:
Mass Dependence of M3Y-Type Interactions and the Effects of Tensor
  Correlations

abstract:
  The mass dependence of the M3Y-type effective interactions and the effects of
tensor correlations are examined. Two-body nuclear matrix elements are obtained
by the lowest order constrained variational (LOCV) technique with and without
tensor correlations. We have found that the tensor correlations are important
especially in the triplet-even (TE) and tensor-even (TNE) channels in order to
reproduce the G-matrix elements obtained previously. Then M3Y-type potentials
for inelastic scattering are obtained by fitting our two-body matrix elements
to those of a sum of Yukawa functions for the mass numbers A=24, A=40 and A=90.


title: In medium T matrix for neutron matter

abstract:
  We calculate the equation of state of pure neutron matter, comparing the
G-matrix calculation with the in-medium T-matrix result. At low densities, we
obtain similar energies per nucleon, however some differences appear at higher
densities. We use the self-consistent spectral functions from the T-matrix
approach to calculate the 1S0 superfluid gap including self-energy effects. We
find a reduction of the superfluid gap by 30%.


title: Effective photon mass in nuclear matter and finite nuclei

abstract:
  Electromagnetic field in nuclear matter and nuclei are studied. In the
nuclear matter, because the expectation value of the electric charge density
operator is not zero, different in vacuum, the U(1) local gauge symmetry of
electric charge is spontaneously broken, and consequently, the photon gains an
effective mass through the Higgs mechanism. An alternative way to study the
effective mass of photon is to calculate the self-energy of photon
perturbatively. It shows that the effective mass of photon is about $5.42MeV$
in the symmetric nuclear matter at the saturation density $\rho_0 =
0.16fm^{-3}$ and about $2.0MeV$ at the surface of ${}^{238}U$. It seems that
the two-body decay of a massive photon causes the sharp lines of
electron-positron pairs in the low energy heavy ion collision experiments of
${}^{238}U+{}^{232}Th$ .


title: Baryon-Meson Loop Effects on the Spectrum of Non Strange Baryons

abstract:
  Corrections to the masses of baryons from baryon-meson loops can induce
splittings between baryons which are comparable to those arising from the
residual interactions between the quarks. These corrections are calculated
using a pair-creation model to give the momentum-dependent vertices, and a
model which includes configuration mixing to describe the wave functions of the
baryons. A large set of baryon-meson intermediate states are employed, with all
allowed SU(3)_f combinations, and excitations of the intermediate baryon states
up to and including the second band of negative-parity excited states. Roughly
half of the splitting between the nucleon and Delta ground states arises from
loop effects. The effects of such loops on the spectrum of negative-parity
excited states are examined, and the resulting splittings are sensitive to
configuration mixing caused by the residual interactions between the quarks.
With reduced-strength one-gluon-exchange interactions between the quarks fit to
the Delta-nucleon splitting, a comparison is made between model masses and the
bare masses required to fit the masses of the states extracted from data
analyses. This shows that it is necessary to also adjust the string tension or
the quark mass to fit the splitting between the average bare masses of the
ground states and negative-parity excited states, and that spin-orbit effects
are likely to be important.


title:
Comparison among Hamiltonian light-front formalisms at q+ = 0 and q+ <>
  0: space-like elastic form factors of pseudoscalar and vector mesons

abstract:
  The electromagnetic elastic form factors of pseudoscalar and vector mesons
are analyzed for space-like momentum transfers in terms of relativistic quark
models based on the Hamiltonian light-front formalism elaborated in different
reference frames (q+ 0 and q+ <> 0). As far as the one-body approximation for
the electromagnetic current operator is concerned, it is shown that the
predictions of the light-front approach at q+=0 should be preferred,
particularly in case of light hadrons, because of: i) the relevant role played
by the Z-graph at q+ <> 0, and ii) the appropriate elimination of spurious
effects, related to the orientation of the null hyperplane where the
light-front wave function is defined.


title:
Dynamical Interpretation of the Nucleon-Nucleon Interaction and Exchange
  Currents in the Large $N_C$ Limit

abstract:
  Expression of the nucleon-nucleon Interaction to order $1/N_C$ in terms of
Fermi Invariants allows a dynamical interpretation of the interaction and leads
to a consistent construction of the associated interaction currents to order
$1/N_C$. The numerically significant components of 4 different modern realistic
phenomenological interaction models are shown to admit very similar meson
exchange interpretations in the large $N_C$ limit. Moreover the ratio of the
volume integrals of the leading, next-to-leading and next-to-next leading order
terms in these interaction models is roughly 300:5-10:0.1, which corresponds
fairly well to the ratios of $1/N_C^2$ between the terms that would be
suggested by the $1/N_C$ expansion if $N_C=3$. The $N_C$ dependence of the
electromagnetic and axial interaction currents that are associated with these
interaction components is derived and compared to that of the corresponding
single nucleon currents.


title: Analysis of directed flow from elliptic flow

abstract:
  The directed flow of particles produced in ultrarelativistic heavy ion
collisions at SPS and RHIC is so small that currently available methods of
analysis are at the border of applicability. Standard two-particle and
flow-vector methods are biased by large nonflow correlations. On the other
hand, cumulants of four-particle correlations, which are free from this bias,
are plagued by large statistical errors. Here, we present a new method based on
three-particle correlations, which uses the property that elliptic flow is
large at these energies. This method may also be useful at intermediate
energies, near the balance energy where directed flow vanishes.


title: Separable RPA for self-consistent nuclear models

abstract:
  Self-consistent factorization of two-body residual interaction is proposed
for arbitrary density- and current-dependent energy functionals. Following this
procedure, a separable RPA (SRPA) method is constructed. SRPA considerably
simplifies the calculations and demonstrates quick convergence to exact
results. The method is tested for SkI3 and SkM* forces.


title: Jet Energy Loss in Hot and Dense Matter

abstract:
  We discuss the the GLV Reaction Operator formalism for computing the
non-abelian energy loss of jets propagating through hot and dense matter. We
incorporate our results on induced gluon bremsstrahlung together with the
effects of nuclear shadowing and multiple scattering in a two component
soft+hard description of heavy ion reactions at RHIC energies. We demonstrate
that good agreement between data and theory can be achieved in the measured
moderate p_T <= 5 GeV window at root(s)=130 AGeV and we extend our predictions
for the high p_T part of the hadronic spectra. We focus on the perspectives of
using jet tomographic methods for probing not only the density and geometry of
the quark-gluon plasma but also its parton composition at various center of
mass energies.


title: Effective masses of diquarks

abstract:
  We study meson and diquark bound states using the rainbow-ladder truncation
of QCD's Dyson-Schwinger equations. The infrared strength of the rainbow-ladder
kernel is described by two parameters. The ultraviolet behavior is fixed by the
one-loop renormalization group behavior of QCD, which ensures the correct
asymptotic behavior of the Bethe-Salpeter amplitudes and brings important
qualitative benefits. The diquark with the lowest mass is the scalar, followed
by the axialvector and pseudoscalar diquark. This ordering can be anticipated
from the meson sector.


title: Nuclear shadowing and in-medium properties of the rho^0

abstract:
  We explain the early onset of shadowing in nuclear photoabsorption within a
multiple scattering approach and discuss its relation to in-medium
modifications of the rho^0.


title: Shape Coexistence in the Relativistic Hartree-Bogoliubov approach

abstract:
  The phenomenon of shape coexistence is studied in the Relativistic
Hartree-Bogoliubov framework. Standard relativistic mean-field effective
interactions do not reproduce the ground state properties of neutron-deficient
Pt-Hg-Pb isotopes. It is shown that, in order to consistently describe binding
energies, radii and ground state deformations of these nuclei, effective
interactions have to be constructed which take into account the sizes of
spherical shell gaps.


title: Chemical Freezeout in Heavy Ion Collisions

abstract:
  We construct a hadronic equation of state consistent with chemical freezeout
and discuss how such an equation of state modifies the radial and elliptic flow
in a hydrodynamic + hadronic cascade model of relativistic heavy ion collisions
at the SPS. Incorporating chemical freezeout does not change the relation
between pressure and energy density. However, it does change the relation
between temperature and energy density. Consequently, when the hydrodynamic
solution and freezeout are expressed in terms of energy density, chemical
freezeout does not modify the hydrodynamic radial and elliptic flow velocities
studied previously. Finally, we examine chemical freezeout within the hadronic
cascade (RQMD). Once chemical freezeout is incorporated into the hydrodynamics,
the final spectra and fireball lifetimes are insensitive to the temperature at
which the switch from hydrodynamics to cascade is made. Closer inspection
indicates that the pion spectrum in chemically frozen hydrodynamics is
significantly cooler than in the hydro+cascade model. This difference is
reflected in $v_{2}(p_{T})$. We extract the freezeout hadron density in RQMD
and interpret it in thermal terms; the freezeout hadron density corresponds to
a freezeout temperature of $T_{f}\approx100 $ MeV and $\mu_{\pi} \approx 80 $
MeV.


title:
Search for Three-Nucleon Force Effects in Two-Body Photodisintegration
  of 3He(3H) and in the Time Reversed Proton-Deuteron Radiative Capture Process

abstract:
  Faddeev calculations have been performed for nucleon-deuteron
photodisintegration of 3He(3H) and proton-deuteron radiative capture. The bulk
of the results is based on the AV18 nucleon-nucleon force and the Urbana IX
three-nucleon force together with explicit exchange currents or applying the
Siegert approach. Three-nucleon force effects are predicted for both processes
and supported by most of the data.


title: How much is RHIC different from SPS? Comparison of the pT-spectra

abstract:
  We show, by means of a simple compilation of the available experimental
results, that the pT-spectra obtained at RHIC and SPS are strikingly similar up
to pT ~ 1.5-2 GeV. In fact, the discrepancies between various experimental
groups working at the same experiment are of the same size as the differences
between RHIC and SPS. Our observation is complementary to the well known fact
of the equality of the measured R_side and R_out HBT radii at RHIC and SPS. In
essence, it points out that the transverse size of the firecylinder and the
strength of the transverse flow are not significantly changed between SPS and
RHIC. This suggests that a saturation mechanism is effective already at SPS. We
also point out that the dominance of protons over pi^+ at large pT can be seen
not only in the RHIC data, but already in the SPS data.


title: Relationship of the 3P0 decay model to other strong decay models

abstract:
  The 3P0 decay model is briefly reviewed. Possible improvements, partly
motivated by the examination of a microscopic description of a quark -
anti-quark pair creation, are considered. They can provide support for the
one-body character of the model which, otherwise, is difficult to justify. To
some extent, they point to a boost effect that most descriptions of processes
involving a pair creation cannot account for.


title:
Numerical Implementation of Three-Body Forces in Bound State Faddeev
  Calculations in Three Dimensions

abstract:
  The Faddeev equations for the three-body bound state are solved directly as
thre e-dimensional integral equations without employing partial wave
decomposition. Two-body forces of the Malfliet-Tjon type and simple spin
independent genuine three-body forces are considered for the calculation of the
three-body binding energy.


title: Effects of Baryon-Meson Intermediate States on Baryon Masses

abstract:
  The mass shifts of experimentally well-known baryons due to meson-baryon
self-energy loops are calculated, and their impact on the observed splitting of
the baryon spectrum is studied. Configuration-mixed wave functions adapted from
a `relativized' model are used with the 3P0 model to provide predictions for
the strength and analytical momentum dependence of the strong vertices.
Intermediate states include all the lightest pseudoscalar and vector mesons and
corresponding baryons required to provide a complete set of spin-flavor
symmetry related baryon-meson states. The sum over intermediate-state baryons
is extended to include the second (N=3) band of negative-parity excited states,
to provide the most complete calculation of its kind to date.
  It is found that with reduced-strength one-gluon-exchange interactions
between the quarks, roughly half of the splitting between the nucleon and Delta
ground states arises from loop effects. The effects of such loops on the
spectrum of negative-parity excited states are also studied, and it is found
that the resulting splittings are sensitive to configuration mixing caused by
the residual interactions. With the extensive set of intermediate baryon-meson
states used, a reasonable correspondence is found between model masses and the
bare masses required to fit the masses of the states extracted from data
analyses.


title: Hydrodynamics at RHIC

abstract:
  The hydrodynamical models used to describe the evolution of heavy-ion
collisions are briefly reviewed and their results compared with recent RHIC
data.


title: Instabilities of infinite matter with effective Skyrme-type interactions

abstract:
  The stability of the equation of state predicted by Skyrme-type interactions
is examined. We consider simultaneously symmetric nuclear matter and pure
neutron matter. The stability is defined by the inequalities that the Landau
parameters must satisfy simultaneously. A systematic study is carried out to
define interaction parameter domains where the inequalities are fulfilled. It
is found that there is always a critical density $\rho_{cr}$ beyond which the
system becomes unstable. The results indicate in which parameter regions one
can find effective forces to describe correctly finite nuclei and give at the
same time a stable equation of state up to densities of 3-4 times the
saturation density of symmetric nuclear matter.


title: Hybrid Baryons

abstract:
  We review the status of hybrid baryons. The only known way to study hybrids
rigorously is via excited adiabatic potentials. Hybrids can be modelled by both
the bag and flux-tube models. The low-lying hybrid baryon is N 1/2^+ with a
mass of 1.5-1.8 GeV. Hybrid baryons can be produced in the glue-rich processes
of diffractive gamma N and pi N production, Psi decays and p pbar annihilation.


title:
A simple functional form for proton-nucleus total reaction cross
  sections

abstract:
  A simple functional form has been found that gives a good representation of
the total reaction cross sections for the scattering of protons from (15)
nuclei spanning the mass range ${}^{9}$Be to ${}^{238}$U and for proton
energies ranging from 20 to 300 MeV.


title: Saturation of nuclear matter and radii of unstable nuclei

abstract:
  We examine relations among the parameters characterizing the phenomenological
equation of state (EOS) of nearly symmetric, uniform nuclear matter near the
saturation density by comparing macroscopic calculations of radii and masses of
stable nuclei with the experimental data. The EOS parameters of interest here
are the symmetry energy S_0, the symmetry energy density-derivative coefficient
L and the incompressibility K_0 at the normal nuclear density. We find a
constraint on the relation between K_0 and L from the empirically allowed
values of the slope of the saturation line (the line joining the saturation
points of nuclear matter at finite neutron excess), together with a strong
correlation between S_0 and L. In the light of the uncertainties in the values
of K_0 and L, we macroscopically calculate radii of unstable nuclei as expected
to be produced in future facilities. We find that the matter radii depend
strongly on L while being almost independent of K_0, a feature that will help
to determine the L value via systematic measurements of nuclear size.


title: Nuclear matter with off-shell propagation

abstract:
  Symmetric nuclear matter is studied within the conserving, self-consistent
T-matrix approximation. This approach involves off-shell propagation of
nucleons in the ladder diagrams. The binding energy receives contributions from
the background part of the spectral function, away form the quasiparticle peak.
The Fermi energy at the saturation point fulfills the Hugenholz-Van Hove
relation. In comparison to the Brueckner-Hartree-Fock approach, the binding
energy is reduced and the equation of state is harder


title: One-loop corrections to omega photoproduction near threshold

abstract:
  One-loop corrections to $\omega$ photoproduction near threshold have been
investigated by using the approximation that all relevant transition amplitudes
are calculated from the tree diagrams of effective Lagrangians. With the
parameters constrained by the data of $\gamma N \to \pi N$, $\gamma N \to \rho
N$, and $\pi N \to \omega N$ reactions, it is found that the one-loop effects
due to the intermediate $\pi N$ and $\rho N$ states can significantly change
the differential cross sections and spin observables. The results from this
exploratory investigation suggest strongly that the coupled-channel effects
should be taken into account in extracting reliable resonance parameters from
the data of vector meson photoproduction in the resonance region.


title:
Transition from the superfluid phase to the normal phase in nuclei far
  from stability

abstract: To be replaced with a revised version.


title: Hyperbolic triangle in the special theory of relativity

abstract:
  The vector form of a Lorentz transformation which is separated with time and
space parts is studied. It is necessary to introduce a new definition of the
relative velocity in this transformation, which plays an important role for the
calculations of various invariant physical quantities. The Lorentz
transformation expressed with this vector form is geometrically well
interpreted in a hyperbolic space. It is shown that the Lorentz transformation
can be interpreted as the law of cosines and sines for a hyperbolic triangle in
hyperbolic trigonometry. So the triangle made by the two origins of inertial
frames and a moving particle has the angles whose sum is less than $180 ^o$.


title: Structures and Transitions in Light Unstable Nuclei

abstract:
  We study the structures of the unstable Be isotopes with the theoretical
method of antisymmetrized molecular dynamics. It is found that various
structures of the excited states appear in the low-energy region of
neutron-rich Be nuclei. Focusing on the 2$\alpha$ clustering, we analyze the
intrinsic structures with the help of the experimental data of Gamow-Teller
transitions.


title:
Variation after Angular Momentum Projection for the Study of Excited
  States Based on Antisymmetrized Molecular Dynamics

abstract:
  In order to study the structure of excited states we perform a variational
calculation after spin parity projection (VAP) within the framework of
Antisymmetrized Molecular Dynamics (AMD). The framework is proven to be a new
powerful approach for the study of the various structures of excited states
because it is free from model assumptions such as inert cores, existence of
clusters, and the axial symmetry. By using finite range interactions with a
density dependent term we reproduce well all the energy levels below 15 MeV in
$^{12}$C. This is the first theoretical model that reproduces many $E2$
transition rates and $\beta$ decays to $^{12}$C successfully.


title: Molecular Structure with Exotic Clusters in light Neutron-rich Nuclei

abstract:
  The excited states of Be-12, Be-14 and B-15 have been studied with a method
of antisymmetrized molecular dynamics. In the predicted excited states we find
novel molecule-like structures with very exotic clusters such as 6He+8He in
Be-14 and 6He+9Li in B-15. The origin of the He-6 cluster development in the
very neutron-rich nuclei is understood by the new-type correlation among 4
neutrons and 2 protons. In this paper we also present our recent challenge to
study $sd$-shell nuclei. Shape coexistence problems in Ar-36 and Ca-40 are
discussed.


title:
Structure of excited states of Be-11 studied with Antisymmetrized
  Molecular Dynamics

abstract:
  The structures of the ground and excited states of Be-11 were studied with a
microscopic method of antisymmetrized molecular dynamics. The theoretical
results reproduce the abnormal parity of the ground state and predict various
kinds of excited states. We suggest a new negative-parity band with a
well-developed clustering structure which reaches high-spin states. Focusing on
a $2\alpha$ clustering structure, we investigated structure of the ground and
excited states. We point out that molecular orbits play important roles for the
intruder ground state and the low-lying $2\hbar \omega$ states. The features of
the breaking of $\alpha$ clusters were also studied with the help of data for
Gamow-Teller transitions.


title: Scaling in many-body systems and proton response

abstract:
  The observation of scaling in processes in which a weakly interacting probe
delivers large momentum ${\bf q}$ to a many-body system reflects the dominance
of incoherent scattering off target constituents. While a suitably defined
scaling function can provide rich information on the internal dynamics of the
target, in general its extraction from the measured cross section requires
careful consideration of the nature of the interaction driving the scattering
process. The analysis of deep inelastic electron-proton scattering in the
target rest frame within standard many-body theory naturally leads to the
emergence of a scaling function that, unlike the commonly used structure
functions $F_1$ and $F_2$, can be identified with the intrinsic proton
response. The implications for the theoretical analysis of deep inelastic
scattering and the interpretation of the data are discussed.


title:
Extension of the full-folding optical model for nucleon-nucleus
  scattering with applications up to 1.5 GeV

abstract:
  The nonrelativistic full-folding optical model approach for nucleon-nucleus
scattering is extended into the relativistic regime. In doing so, kinematical
issues involving the off-shell Lorentz boost of the colliding particles between
the two nucleons and the projectile-nucleus center-of-mass reference frames
have been taken into account. The two-body effective interaction is obtained in
the framework of the nuclear matter g-matrix using nucleon-nucleon optical
model potentials that fully account for the inelasticities and isobar
resonances in the continuum at nucleon energies up to 3 GeV. Diverse
nucleon-nucleon potential models were constructed by supplementing the basic
Paris, Nijmegen, Argonne or Gel'fand-Levitan-Marchenko inversion potentials
with complex separable terms. In each case the additional separable terms
ensured that the combination led to NN scattering phase shifts in excellent
agreement with experimental values. With each phase shift fitting potential
nuclear matter g-matrices have been formed and with each of those relativistic
full-folding optical potentials for nucleon-nucleus elastic scattering
determined. Application to such scattering for projectile energies to 1.5 GeV
have been made. Good and systematic agreement is obtained between the
calculated and measured observables, both differential and integrated
quantities, over the whole energy range of our study. A moderate sensitivity to
off-shell effects in the differential scattering observables also is observed.


title: On the spin, parity and nature of the $\Xi(1620)$ resonance

abstract:
  Using a unitary extension of chiral perturbation theory with a lowest-order
s-wave SU(3) chiral Lagrangian we study low-energy meson-baryon scattering in
the strangeness $S=-2$ sector. A scattering-matrix pole is found around 1606
MeV which corresponds to an s-wave $\Xi$ resonance with $J^P=1/2^-$. We
identify this resonance with the $\Xi(1620)$ state, quoted in the Particle Data
Book with $I=1/2$ but with unknown spin and parity. The addition of the $S=-2$
state to the recently computed $\Lambda(1670)$, $\Sigma(1620)$ and N(1535)
states completes the octet of $J^P=1/2^-$ resonances dynamically generated in
this chiral unitary approach.


title: Model for pairing phase transition in atomic nuclei

abstract:
  A model is developed which allows the investigation and classification of the
pairing phase transition in atomic nuclei. The regions of the parameter space
are discussed for which a pairing phase transition can be observed. The model
parameters include: number of particles, attenuation of pairing correlations
with increasing seniority, single particle level spacing, and pairing gap
parameter. It is argued that for nuclear models, the pairing phase transition
has to be separated in temperature from the signal of the exhaustion of the
finite model space.


title: Pions in the Pionless Effective Field Theory

abstract:
  We show that processes involving pions that remain very near their mass-shell
can be reliably computed in the pionless effective field theory, with the pion
integrated in as a heavy field. As an application, we compute the pion-deuteron
scattering amplitude near threshold to next-to-leading order in the momentum
expansion. This amplitude is formally dominated by an infrared logarithm of the
form log(gamma/mpi), where gamma is the deuteron binding momentum, and mpi is
the mass of the pion. The coefficient of this logarithm is determined by the
S-wave pion-nucleon scattering lengths.


title: Nuclear Matter Mean Field with Extended NJL Model

abstract:
  An extended version of the Nambu-Jona-Lasinio (NJL) model is applied to
describe both nuclear matter and surface properties of finite nuclei. Several
parameter sets are discussed and a comparison of the saturation properties and
equation of state (EOS) with the NL3 parametrization of the non-linear Walecka
model is made. The properties of asymmetric matter are discussed.


title:
(\Omega \Omega)_{0^+} dibaryon productions in central Au+Au collisions
  at RHIC energy \sqrt {s_{NN}} =130GeV

abstract:
  Based on the measured transverse mass spectra of \pi^-, K^- and \bar p at the
RHIC energy \sqrt {s_{NN}} =130GeV, di-omega productions from baryon-baryon
reactions in hadronic matter are studied. Results about the (\Omega
\Omega)_{0^+} total number per event show that the deeply bound state (\Omega
\Omega)_{0^+} can be observed at RHIC energies.


title: Probing Hadronization with Strangeness

abstract:
  The Omega-bar/Omega ratio originating from string decays is predicted to be
larger than unity in proton-proton interaction at SPS energies. The anti-omega
dominance increases with decreasing beam energy. This surprising behavior is
caused by the combinatorics of quark-antiquark production in small and low-mass
strings. Since this behavior is not found in a statistical description of
hadron production in proton-proton collisions, it may serve as a key observable
to probe the hadronization mechanism in such collisions.


title:
Pion-nucleon amplitude near threshold: the sigma-term and scattering
  lengths beyond few loops

abstract:
  The pion-nucleon amplitude is considered in the vicinity of the elastic
scattering threshold within a relativistic dynamical model dressing the pi N N
and pi N Delta vertices self-consistently with an infinite number of meson
loops. The dressing is formulated as solution of a system of coupled integral
equations incorporating unitarity, crossing symmetry and analyticity
constraints. The calculated scattering lengths and the sigma-term agree with
recent data analyses. The dressing is important in this model both below and at
threshold. The contribution of the Delta resonance is discussed, including
effects of the consistent dressing of the pi N Delta vertex. A comparison with
the approaches of chiral perturbation theory and the Bethe-Salpeter equation is
outlined.


title:
In-medium Effects in the Eta-Photoproduction through the $S_{11}$
  Resonance with the Relativistic Approach

abstract:
  In-medium effects in photon excitation of the S$_{11}$ resonance from nucleon
and its decay to $\eta$-meson using the RMF approach is studied. We examine the
in-medium effects by varing the Dirac fields of the nucleon and the S$_{11}$
resonance separately. We obtained a conclusion that the Dirac fields of the
nucleon, which reduces the nucleon effective mass, enlarge the width of
S$_{11}$ resonance, and small Dirac-fields of the resonance shifts the peak
position, and these combined effects can explain the in-medium properties
observed in the experimental data for $^{12}$C($\gamma$,$\eta$) reaction.