title:
Dissociation cross sections of ground-state and excited charmonia with
  light mesons in the quark model

abstract:
  We present numerical results for the dissociation cross sections of
ground-state, orbitally- and radially-excited charmonia in collisions with
light mesons. Our results are derived using the nonrelativistic quark model, so
all parameters are determined by fits to the experimental meson spectrum.
Examples of dissociation into both exclusive and inclusive final states are
considered. The dissociation cross sections of several C=(+) charmonia may be
of considerable importance for the study of heavy ion collisions, since these
states are expected to be produced more copiously than the J/psi. The relative
importance of the productions of ground-state and orbitally-excited charmed
mesons in a pion-charmonium collision is demonstrated through the $\sqrt
{s}$-dependent charmonium dissociation cross sections.


title:
Intensity Interferometry for a Chaotic Source with a Collective Flow and
  Multiple Scattering

abstract:
  We study the effects of a collective flow and multiple scattering on
two-particle correlation measurements in Hanbury-Brown-Twiss intensity
interferometry. We find that under a collective flow the effective source
distribution in a two-particle correlation measurement depends on the initial
source distribution. In addition, it depends on a collective flow phase
function which consists of terms that tend to cancel each other. As the
detected particles traverse from the source point to the freeze-out point, they
are subject to multiple scattering with medium particles. We examine the
effects of multiple scattering on HBT correlations. By using the Glauber theory
of multiple scattering at high energies and the optical model at intermediate
energies, we find that multiple scattering leads to an absorption and an
effective density distribution that depends on the initial source distribution.


title:
Photon interferometry and size of the hot zone in relativistic heavy ion
  collisions

abstract:
  The parameters obtained from the theoretical analysis of the single photon
spectra observed by the WA98 collaboration at SPS energies have been used to
evaluate the two photon correlation functions. The single photon spectra and
the two photon correlations at RHIC energies have also been evaluated, taking
into account the effects of the possible spectral change of hadrons in a
thermal bath. We find that the ratio $R_{side}/R_{out} \sim 1$ for SPS and
$R_{side}/R_{out} <1$ for RHIC energy.


title: Application of the Lorentz-Transform Technique to Meson Photoproduction

abstract:
  We show that the Lorentz integral transform (LIT) technique which has been
successfully applied to photoreactions in light nuclei can also be applied to
photoreactions involving particle production. A simple model where results are
easily calculable in the traditional fashion is used to test the technique.
Specifically we compute inclusive $\pi^+$ photoproduction from deuterium for
photon energies less than 200 MeV using a Yamaguchi model for the NN
interaction. It is demonstrated that although the response functions for
inclusive meson production do not have favourable asymptotic behavior one can
nontheless extract them by inversion of the transform. The implication is that
one can treat realistic problems of photo-meson production including all final
state interactions by means of the LIT technique.


title: Systematics of Fission Barriers in Superheavy Elements

abstract:
  We investigate the systematics of fission barriers in superheavy elements in
the range Z = 108-120 and N = 166-182. Results from two self-consistent models
for nuclear structure, the relativistic mean-field (RMF) model as well as the
non-relativistic Skyrme-Hartree-Fock approach are compared and discussed. We
restrict ourselves to axially symmetric shapes, which provides an upper bound
on static fission barriers. We benchmark the predictive power of the models
examining the barriers and fission isomers of selected heavy actinide nuclei
for which data are available. For both actinides and superheavy nuclei, the RMF
model systematically predicts lower barriers than most Skyrme interactions. In
particular the fission isomers are predicted too low by the RMF, which casts
some doubt on recent predictions about superdeformed ground states of some
superheavy nuclei. For the superheavy nuclei under investigation, fission
barriers drop to small values around Z = 110, N = 180 and increase again for
heavier systems. For most of the forces, there is no fission isomer for
superheavy nuclei, as superdeformed states are in most cases found to be
unstable with respect to octupole distortions.


title:
Spectroscopy of heavy nuclei by configuration mixing of symmetry
  restored mean-field states: Shape coexistence in neutron-deficient Pb
  isotopes

abstract:
  We study shape coexistence and low-energy excitation spectra in
neutron-deficient Pb isotopes using configuration mixing of angular-momentum
and particle-number projected self-consistent mean-field states. The same
Skyrme interaction SLy6 is used everywhere in connection with a
density-dependent zero-range pairing force.


title: Skyrme mean-field study of rotational bands in transfermium isotopes

abstract:
  Self-consistent mean field calculations with the SLy4 interaction and a
density-dependent pairing force are presented for nuclei in the Nobelium mass
region. Predicted quasi-particle spectra are compared with experiment for the
heaviest known odd N and odd Z nuclei. Spectra and rotational bands are
presented for nuclei around No252,4 for which experiments are either planned or
already running.


title:
Precise estimation of shell model energy by second order extrapolation
  method

abstract:
  A second order extrapolation method is presented for shell model
calculations, where shell model energies of truncated spaces are well described
as a function of energy variance by quadratic curves and exact shell model
energies can be obtained by the extrapolation. This new extrapolation can give
more precise energy than those of first order extrapolation method. It is also
clarified that first order extrapolation gives a lower limit of shell model
energy. In addition to the energy, we derive the second order extrapolation
formula for expectation values of other observables.


title:
Gamow Shell Model Description of Weakly Bound Nuclei and Unbound Nuclear
  States

abstract:
  We present the study of weakly bound, neutron-rich nuclei using the nuclear
shell model employing the complex Berggren ensemble representing the bound
single-particle states, unbound Gamow states, and the non-resonant continuum.
In the proposed Gamow Shell Model, the Hamiltonian consists of a one-body
finite depth (Woods-Saxon) potential and a residual two-body interaction. We
discuss the basic ingredients of the Gamow Shell Model. The formalism is
illustrated by calculations involving {\it several} valence neutrons outside
the double-magic core: $^{6-10}$He and $^{18-22}$O.


title: An analysis of the reaction pp --> pp\eta near threshold

abstract:
  It is shown that most of the available data on the $pp\to pp\eta$ reaction,
including the invariant mass distributions in the $pp\to pp\eta$ reaction
recently measured at COSY, can be understood in terms of the partial-wave
amplitudes involving final $pp$ $S$ and $P$ states and the $\eta$ meson s-wave.
This finding, together with the fact that results within a meson--exchange
model are especially sensitive to the details of the excitation mechanism of
the $S_{11}(1535)$ resonance, demonstrates the possibility of investigating the
properties of this resonance in $NN$ collisions. The spin correlation function
$C_{xx}$ is shown to disentangle the $S$- and $P$-wave contributions. It is
also argued that spin correlations may be used to help constrain the
contributions of the amplitudes corresponding to the final $pp$ $^3P_0$


title: Coulomb excitation of 11Be reexamined

abstract:
  The study of Coulomb excitation of 11Be to the first excited state in
intermediate energy collisions with heavy targets is presented. The existing
experimental data are reanalised by including the probability of projectile
survival into the calculation of Coulomb excitation cross sections. The
survival probabilities are calculated using a recently developed global optical
model potential tailored in line with the double folding model. The extracted
B(E1) values for the transition 1/2+ --> 1/2- in 11Be are found to be slightly
larger than those obtained so far using the b_0-recipe in Coulomb excitation
theory.


title:
The reaction $pd\to(pp)n$ at high momentum transfer and short-range NN
  properties

abstract:
  A recent cross section measurement of the deuteron breakup reaction $pd\to
(pp)(0^\circ)+n(180^\circ)$, in the GeV region in a kinematics similar to
backward $pd$ elastic scattering, strongly contradicts predictions of a $pd \to
dp$ model based on the one-nucleon exchange, single pN scattering and $\Delta$
excitation mechanisms, and on the wave functions of the Reid soft core and
Paris $NN$ potentials. We show within the same model that for the CD Bonn $NN$
potential there is qualitative agreement with the data. It is attributed to a
reduction of the one-nucleon exchange at energies above 1 GeV and an increase
of the $\Delta(1232)$-isobar contribution, both related to the short-range
properties of the wave functions generated by this potential.


title: Improved Empirical Hamiltonians for Neutron-rich Nuclei in 132Sn region

abstract:
  Using recent experimental information for 132Sn region, an empirical
Hamiltonian is obtained by some modifications of a Hamiltonian (CW5082)
originally derived from the 208Pb region. Shell model calculations with the new
Hamiltonian shows remarkable improvement in the predictive power when compared
with the available experimental results. It overcomes many limitations of the
CW5082 Hamiltonian in this region, specially for N>=84 isotones. The calculated
level spectra and B(E2) values with the new Hamiltonian, also compare well with
the available results calculated with the CD-Bonn and SKX Hamiltonians,
reflecting consistency in the wave function structure at least in the low-lying
regions. Interesting behaviour of effective charges is revealed in this region.
It is shown that a drastic reduction of proton effective charge is necessary
for obtaining B(E2) values for the N=84 isotones. Neutron effective charge is
found to be in the range (0.62 - 0.72)e. We predict the spectroscopic
properties of 135,136Sn not yet known experimentally. Further improvement of
the modified Hamiltonian is also initiated.


title:
Radiative capture and electromagnetic dissociation involving loosely
  bound nuclei: the $^8$B example

abstract:
  Electromagnetic processes in loosely bound nuclei are investigated using an
analytical model. In particular, electromagnetic dissociation of $^8$B is
studied and the results of our analytical model are compared to numerical
calculations based on a three-body picture of the $^8$B bound state. The
calculation of energy spectra is shown to be strongly model dependent. This is
demonstrated by investigating the sensitivity to the rms intercluster distance,
the few-body behavior, and the effects of final state interaction. In contrast,
the fraction of the energy spectrum which can be attributed to E1 transitions
is found to be almost model independent at small relative energies. This
finding is of great importance for astrophysical applications as it provides us
with a new tool to extract the E1 component from measured energy spectra. An
additional, and independent, method is also proposed as it is demonstrated how
two sets of experimental data, obtained with different beam energy and/or
minimum impact parameter, can be used to extract the E1 component.


title: Euclidean resonance and a new type of nuclear reactions

abstract:
  The extremely small probability of quantum tunneling through an almost
classical potential barrier may become not small under the action of the
specially adapted nonstationary field. The tunneling rate has a sharp peak as a
function of the particle energy when it is close to the certain resonant value
defined by the nonstationary field (Euclidean resonance). Alpha decay of nuclei
has a small probability since the alpha particle should tunnel through a very
nontransparent Coulomb barrier. The incident proton, due to the Coulomb
interaction with the tunneling alpha particle, plays the role of a
nonstationary field which may result in Euclidean resonance in tunneling of the
alpha particle. At the resonant proton energy, which is of the order of 0.2
Mev, the alpha particle escapes the nucleus and goes to infinity with no
influence of the nuclear Coulomb barrier. The process is inelastic since the
alpha particle releases energy and the proton gains it. This stimulation of
alpha decay by a proton constitutes a new type of nuclear reactions.


title:
Vector meson production and nucleon resonance analysis in the Giessen
  coupled-channel model

abstract:
  We present a nucleon resonance analysis by simultaneously considering all
pion- and photon-induced experimental data on the final states $\gamma N$, $\pi
N$, $2\pi N$, $\eta N$, $K\Lambda$, $K\Sigma$, and $\omega N$ for energies from
the nucleon mass up to $\sqrt s = 2$ GeV. In this analysis we find strong
evidence for various higher lying resonances as, e.g., the $P_{13}(1900)$. The
$\omega N$ production mechanism is dominated by large $P_{11}(1710)$ and
$P_{13}(1900)$ contributions.


title: Light clusters production as a probe to the nuclear symmetry energy

abstract:
  Using an isospin-dependent transport model for heavy-ion collisions induced
by neutron-rich nuclei at intermediate energies, we study the production of
light clusters such as deuteron, triton, and $^{3}$He via coalescence of
nucleons. We find that both the yields and energy spectra of these light
clusters are affected significantly by the density dependence of nuclear
symmetry energy, with a stiffer symmetry energy giving a larger yield.


title: Where is the charm quark energy loss at RHIC?

abstract:
  Heavy quark energy loss in a hot QCD plasma is computed taking into account
the competing effects due to suppression of zeroth order gluon radiation below
the plasma frequency and the enhancement of gluon radiation due to first order
medium induced Bremsstrahlung.
  The results suggest a surprising degree of cancellation between the two
medium effects for charm quarks and provides a possible explanation for the
null effect observed by PHENIX in the prompt electron spectrum in Au+Au at
$\surd s=$ 130 AGeV.


title:
A microscopic estimate of the nuclear matter compressibility and
  symmetry energy in relativistic mean-field models

abstract:
  The relativistic mean-field plus RPA calculations, based on effective
Lagrangians with density-dependent meson-nucleon vertex functions, are employed
in a microscopic analysis of the nuclear matter compressibility and symmetry
energy. We compute the isoscalar monopole and the isovector dipole response of
$^{208}$Pb, as well as the differences between the neutron and proton radii for
$^{208}$Pb and several Sn isotopes. The comparison of the calculated excitation
energies with the experimental data on the giant monopole resonance in
$^{208}$Pb, restricts the nuclear matter compression modulus of structure
models based on the relativistic mean-field approximation to $K_{\rm nm}\approx
250 - 270$ MeV. The isovector giant dipole resonance in $^{208}$Pb, and the
available data on differences between neutron and proton radii, limit the range
of the nuclear matter symmetry energy at saturation (volume asymmetry) to 32
MeV $\leq a_4 \leq$ 36 MeV.


title: Nucleon participants or quark participants?

abstract:
  We show that centrality dependence of charged particle pseudorapidity density
at midrapidity in Au+Au collisions at RHIC is well described as proportional to
We show that centrality dependence of charged particle pseudorapidity density
at midrapidity in Au+Au collisions at RHIC is well described as proportional to
the number of participating constituent quarks. In this approach there is no
need for an additional contribution from hard processes usually considered in
the models based on the number of the nucleon participants.


title:
Spectral functions of isoscalar scalar and isovector electromagnetic
  form factors of the nucleon at two-loop order

abstract:
  We calculate the imaginary parts of the isoscalar scalar and isovector
electromagnetic form factors of the nucleon up to two-loop order in chiral
perturbation theory. Particular attention is paid on the correct behavior of Im
$\sigma_N(t)$ and Im $G_{E,M}^V(t)$ at the two-pion threshold $t_0=4 m_\pi^2$
in connection with the non-relativistic 1/M-expansion. We recover the
well-known strong enhancement near threshold originating from the nearby
anomalous singularity at $t_c = 4m_\pi^2-m_\pi^4/M^2 = 3.98 m_\pi^2$. In the
case of the scalar spectral function Im $\sigma_N(t)$ one finds a significant
improvement in comparison to the lowest order one-loop result. Higher order
$\pi\pi$-rescattering effects are however still necessary to close a remaining
20%-gap to the empirical scalar spectral function. The isovector electric and
magnetic spectral functions Im $G_{E,M}^V(t)$ get additionally enhanced near
threshold by the two-pion-loop contributions. After supplementing their
two-loop results by a phenomenological $\rho$-meson exchange term one can
reproduce the empirical isovector electric and magnetic spectral functions
fairly well.


title: In-medium vector meson masses in a Chiral SU(3) model

abstract:
  A significant drop of the vector meson masses in nuclear matter is observed
in a chiral SU(3) model due to the effects of the baryon Dirac sea. This is
taken into account through the summation of baryonic tadpole diagrams in the
relativistic Hartree approximation. The appreciable decrease of the in-medium
vector meson masses is due to the vacuum polarisation effects from the nucleon
sector and is not observed in the mean field approximation.


title:
The role of the $\Delta$(1232) on the longitudinal response in the
  inclusive electron scattering reaction

abstract:
  We have performed a many-body calculation of the longitudinal nuclear
$(e,e')$ reaction employing a Second RPA (SRPA) formalism which contains the
$\Delta$(1232). More explicitly, our scheme contains RPA correlations as well
as Hartree-Fock and second order self-energies, where an accurate evaluation of
exchange terms is achieved. Using this formalism we have evaluated the
longitudinal response function for $^{40}Ca$. We give final results at momentum
transfers ranging from 300 up to 500 MeV/c, obtaining a good agreement with
data.


title: Exact treatment of Pauli exclusion effects in (p,p') reactions

abstract:
  This paper presents the first calculations of proton inelastic scattering in
which the medium effect of Pauli blocking is included through an exact, rather
than angle averaged, operator. This improvement is important in the isoscalar
channel at proton energies near 100 MeV and fades as the energy rises. However,
processes that emphasize finite-range exchange (such as $0^+\to 0^-$ reactions)
still see significant effects at 200 MeV. The results depend on the directions
of the incident and struck nucleon momenta that produce the most important
contributions to the DWBA integral at each scattering angle.


title: Alpha-particle condensation in nuclei

abstract:
  A round up of the present status of the conjecture that n alpha nuclei form
an alpha-particle condensate in excited states close to the n alpha threshold
is given. Experiments which could demonstrate the condensate character are
proposed. Possible lines of further theoretical developments are discussed.


title: Jet Quenching and Radiative Energy Loss in Dense Nuclear Matter

abstract:
  We review recent finite opacity approaches (GLV, WW, WOGZ) to the computation
of the induced gluon radiative energy loss and their application to the
tomographic studies of the density evolution in ultra-relativistic nuclear
collisions.


title:
Effective Lagrangian and Dynamical Symmetry Breaking in the SU(2)XU(1)
  NJL Model

abstract:
  Dynamical symmetry breaking and the formation of scalar condensates in the
SU(2)XU(1) Nambu-Jona-Lasinio model with two coupling constants has been
studied in the framework of the mean field approximation. The bosonization
procedures of the model are performed using the functional integration method.
The possibility of the spontaneous CP symmetry breaking in the model under
consideration has been shown. The mass spectrum of the bound states of
fermions, as well as the effective Lagrangian of interacting scalar and
pseudoscalar mesons are obtained.


title: Colour-singlet clusters in systems composed of six quarks

abstract:
  We present an investigation of six quarks system kinematics, independent on
quark-quark interactions. There has been created and investigated basis of six
quarks antisymmetrical and translationally invariant functions, applying
formalism with spin, isospin, and color degrees of freedom and many-particle
harmonic oscillator (HO) functions, dependent on Jacobian variables. We have
also investigated expansions of realistic wave-functions in this basis. There
are given analytical expressions for matrix elements of three and six particle
antisymmetrizers and probability to find two colorless hadrons in six quarks
system.


title:
Determination of the chiral coupling constants c3 and c4 in new pp and
  np partial-wave analyses

abstract:
  As a first result of two new partial-wave analyses, one of the pp and another
one of the np scattering data below 500 MeV, we report a study of the
long-range chiral two-pion exchange interaction which contains the chiral
coupling constants c1, c3, and c4. By using as input a theoretical value for c1
we are able to determine in pp as well as in np scattering accurate values for
c3 and c4. The values determined from the pp data and independently from the np
data are in very good agreement, indicating the correctness of the chiral
two-pion exchange interaction. The weighted averages are c3 = -4.78(10) / GeV
and c4 = 3.96(22) / GeV, where the errors are statistical. The value of c3 is
best determined from the pp data and that of c4 from the np data.


title: Renormalization Group Methods for the Nuclear Many-Body Problem

abstract:
  The application of renormalization group methods to microscopic nuclear
many-body calculations is discussed. We present the solution of the
renormalization group equations in the particle-hole channels for neutron
matter and the application to S-wave pairing. Furthermore, we point out that
the inclusion of tensor and spin-orbit forces leads to spin non-conserving
effective interactions in nuclear matter.


title:
$K^-/K^+$ ratio in heavy-ion collisions at GSI with an antikaon
  self-energy in hot and dense matter

abstract:
  The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is
studied. The in-medium properties at finite temperature of the hadrons involved
are included, paying a special attention to the in-medium properties of
antikaons. Using a statistical approach, it is found that the determination of
the temperature and chemical potential at freeze-out conditions compatible with
the ratio $K^-/K^+$ is very delicate, and depends very strongly on the
approximation adopted for the antikaon self-energy. The use of an energy
dependent $\bar{K}$ spectral density, including both s and p-wave components of
the $\bar{K}N$ interaction, lowers substantially the freeze-out temperature
compared to the standard simplified mean-field treatment and gives rise to an
overabundance of $K^-$ production in the dense and hot medium. Even a
moderately attractive antikaon-nucleus potential obtained from our
self-consistent many-body calculation does reproduce the ``broad-band
equilibration'' advocated by Brown, Rho and Song due to the additional strength
of the spectral function of the $K^-$ at low energies.


title: Quantum thermodynamic fluctuations of a chaotic Fermi-gas model

abstract:
  We investigate the thermodynamics of a Fermi gas whose single-particle energy
levels are given by the complex zeros of the Riemann zeta function. This is a
model for a gas, and in particular for an atomic nucleus, with an underlying
fully chaotic classical dynamics. The probability distributions of the quantum
fluctuations of the grand potential and entropy of the gas are computed as a
function of temperature and compared, with good agreement, with general
predictions obtained from random matrix theory and periodic orbit theory (based
on prime numbers). In each case the universal and non--universal regimes are
identified.


title: Atomic Nuclei with Tetrahedral and Octahedral Symmetries

abstract:
  We present possible manifestations of octahedral and tetrahedral symmetries
in nuclei. These symmetries are associated with the OhD and TdD double point
groups. Both of them have very characteristic finger-prints in terms of the
nucleonic level properties - unique in the Fermionic universe. The tetrahedral
symmetry leads to the four-fold degeneracies in the nucleonic spectra; it does
not preserve the parity. The octahedral symmetry leads to the four-fold
degeneracies in the nucleonic spectra as well but it does preserve the parity.
  Microscopic predictions have been obtained using mean-field theory based on
the relativistic equations and confirmed by using 'traditional' Schroedinger
equation formalism. Calculations are performed in multidimensional deformation
spaces using newly designed algorithms.
  We discuss some experimental fingerprints of the hypothetical new symmetries
and possibilities of their verification through experiments.


title:
Pion electroproduction, PCAC, chiral Ward identities, and the axial form
  factor revisited

abstract:
  We re-investigate Adler's PCAC relation in the presence of an external
electromagnetic field within the framework of QCD coupled to external fields.
We discuss pion electroproduction within a tree-level approximation to chiral
perturbation theory and explicitly verify a chiral Ward identity referred to as
the Adler-Gilman relation. We critically examine soft-momentum techniques and
point out how inadmissable approximations may lead to results incompatible with
chiral symmetry. As a result we confirm that threshold pion electroproduction
is indeed a tool to obtain information on the axial form factor of the nucleon.


title: Structure function of a damped harmonic oscillator

abstract:
  Following the Caldeira-Leggett approach to describe dissipative quantum
systems the structure function for a harmonic oscillator with Ohmic dissipation
is evaluated by an analytic continuation from euclidean to real time. The
analytic properties of the Fourier transform of the structure function with
respect to the energy transfer (the ``characteristic function'') are studied
and utilized. In the one-parameter model of Ohmic dissipation we show
explicitly that the broadening of excited states increases with the state
number without violating sum rules. Analytic and numerical results suggest that
this is a phenomenologically relevant, consistent model to include the coupling
of a single (sub-)nuclear particle to unobserved and complex degrees of
freedom.


title: Rapidity Asymmetry in High-energy $d+A$ Collisions

abstract:
  In contrast to the recent prediction of high $p_T$ hadron suppression within
the parton saturation model, it is shown that multiple parton scattering
suffered by the projectile will enhance high $p_T$ hadron spectra in $d+A$
collisions relative to a superposition of binary $p+p$ collisions at RHIC. A
stronger enhancement in the forward rapidity region of the projectile is also
predicted, resulting in a unique rapidity asymmetry of the hadron spectra at
high $p_T$. The shape of the rapidity asymmetry should be reversed for low
$p_T$ hadrons that are dominated by soft and coherent interactions which
suppress hadron spectra in the projectile rapidity region. The phenomenon at
the LHC energies is shown to be qualitatively different because of parton
shadowing.


title: Higher spin hadrons as relativistic fields

abstract:
  I discuss the problem of consistent interactions of higher-spin fields and
its relevance to resonance physics.


title: Self-consistent Approach to Off-Shell Transport

abstract:
  The properties of two forms of the gradient expanded Kadanoff--Baym
equations, i.e. the Kadanoff--Baym and Botermans-Malfliet forms, suitable to
describe the transport dynamics of particles and resonances with broad spectral
widths, are discussed in context of conservation laws, the definition of a
kinetic entropy and the possibility of numerical realization. Recent results on
exact conservations of charge and energy-momentum within Kadanoff-Baym form of
quantum kinetics based on local coupling schemes are extended to two cases
relevant in many applications. These concern the interaction via a finite range
potential, and, relevant in nuclear and hadron physics, e.g. for the
pion--nucleon interaction, the case of derivative coupling.


title: Short-ranged radial and tensor correlations in nuclear many-body systems

abstract:
  The Unitary Correlation Operator Method (UCOM) is applied to realistic
potentials. The effects of tensor correlations are investigated. The resulting
phase shift equivalent correlated interactions are used in the no-core shell
model for light nuclei and for mean-field calculations in the Fermionic
Molecular Dynamics model for nuclei up to mass A=48.


title: Exploring Baryon Chiral Multiplets

abstract:
  The full QCD chiral symmetry algebra has predictive consequences at low
energies. I discuss the ground-state chiral multiplet involving the light
baryons and emphasize the special role of the Roper resonance.


title: Threshold Resonances - a Lattice Perspective

abstract:
  The calculation of the masses of the lightest nucleon resonances using
lattice QCD is surveyed. Recent results for the mass of the first radial
excitation of the nucleon, the Roper resonance, are reviewed and the
interpretation in terms of models of hadronic resonances, such as the quark
model and hadronic molecules, discussed. The talk concludes with an outline of
prospects for future calculations.


title: Nuclear pairing: new perspectives

abstract:
  Nuclear pairing correlations are known to play an important role in various
single-particle and collective aspects of nuclear structure. After the first
idea by A. Bohr, B. Mottelson and D. Pines on similarity of nuclear pairing to
electron superconductivity, S.T. Belyaev gave a thorough analysis of the
manifestations of pairing in complex nuclei. The current revival of interest in
nuclear pairing is connected to the shift of modern nuclear physics towards
nuclei far from stability; many loosely bound nuclei are particle-stable only
due to the pairing. The theoretical methods borrowed from macroscopic
superconductivity turn out to be insufficient for finite systems as nuclei, in
particular for the cases of weak pairing and proximity of continuum states. We
suggest a simple numerical procedure of exact solution of the nuclear pairing
problem and discuss the physical features of this complete solution. We show
also how the continuum states can be naturally included in the consideration
bridging the gap between the structure and reactions. The path from coherent
pairing to chaos and thermalization and perspectives of new theoretical
approaches based on the full solution of pairing are discussed.


title:
Hadron formation and attenuation in deep inelastic lepton scattering off
  nuclei

abstract:
  We investigate hadron formation in deep inelastic lepton scattering on N, Kr
and Xe nuclei in the kinematic regime of the HERMES experiment. The elementary
electron-nucleon interaction is described within the event generator PYTHIA
while a full coupled-channel treatment of the final state interactions is
included by means of a BUU transport model. We find a good agreement with the
measured charged hadron multiplicity ratio $R_M^h$ for N and Kr targets by
accounting for the deceleration and absorption of the primarily produced
particles as well as for the creation of secondary hadrons in the final state
interactions.


title: Nonlinear Regge trajectories and glueballs

abstract:
  We apply a phenomenological approach based on nonlinear Regge trajectories to
glueball states. The parameters, i.e., intercept and threshold, or trajectory
termination point beyond which no bound states should exist, are determined
from pomeron (scattering) data. Systematic errors inherent to the approach are
discussed. We then predict masses of glueballs on the tensor trajectory. For
comparison, the approach is applied to available quenched lattice data. We find
a discrepancy between the lattice based thresholds and the pomeron threshold
that we extract from data.


title: Resonant State in Helium-4 Lambda

abstract:
  In a recent experiment E906 at the BNL-AGS, a search for light S=-2
hypernuclei, strong evidence was found for the nuclide Hydrogen-4 double
Lambda. One of the most striking components of this data was the appearance of
a narrow low-momentum pi- line at k(pi-) = 104-105 MeV/c. This was ascribed to
the decay of Hydrogen-4 double Lambda into a resonant state in Helium-4 Lambda.
The existence of such a state is shown to be plausible and its characteristics
are delineated.


title:
Self-consistent approach to deformation of intruder states in
  neutron-deficient Pb and Po

abstract:
  We present systematic calculations of the properties of 11- isomers in
neutron-deficient 184-198Pb and 188-200Po. These states are based on the proton
(h9/2 i13/2)_{K = 11-} configuration. They are calculated in the framework of
the Hartree-Fock-Bogoliubov method with a Skyrme interaction and
density-dependent pairing force. The energies and deformations of the 11-
states are compared to those of the intruder 0+ states in both Pb and Po
isotopes. In the most neutron-deficient Po isotopes, the calculations predict,
below a weakly oblate 11- state, another oblate 11- state which is even more
deformed than the intruder oblate 11- state in their Pb isotones. The energies
and quadrupole moments of the 11- isomers, corresponding to a weakly oblate
nuclear shape, are in fair agreement with the available experimental data.


title: Gamow-Teller strength distributions in Fe and Ni stable isotopes

abstract:
  We study Gamow-Teller strength distributions in some selected nuclei of
particular Astrophysical interest within the iron mass region. The theoretical
framework is based on a proton-neutron Quasiparticle Random Phase Approximation
built on a deformed selfconsistent mean field basis obtained from two-body
density-dependent Skyrme forces. We compare our results to available
experimental information obtained from (n,p) and (p,n) charge exchange
reactions.


title: Light-front gauge propagator reexamined

abstract:
  Gauge fields are special in the sense that they are invariant under gauge
transformations and \QTR{em}{``ipso facto''} they lead to problems when we try
quantizing them straightforwardly. To circumvent this problem we need to
specify a gauge condition to fix the gauge so that the fields that are
connected by gauge invariance are not overcounted in the process of
quantization. The usual way we do this in the light-front is through the
introduction of a Lagrange multiplier, $(n\cdot A)^{2}$, where $n_{\mu}$ is the
external light-like vector, i.e., $n^{2}=0$, and $A_{\mu}$ is the vector
potential. This leads to the usual light-front propagator with all the ensuing
characteristics such as the prominent $(k\cdot n)^{-1}$ pole which has been the
subject of much research. However, it has been for long recognized that this
procedure is incomplete in that there remains a residual gauge freedom still to
be fixed by some ``ad hoc'' prescription, and this is normally worked out to
remedy some unwieldy aspect that emerges along the way. In this work we propose
a new Lagrange multiplier for the light-front gauge that leads to the correctly
defined propagator with no residual gauge freedom left. This is accomplished
via $(n\cdot A)(\partial \cdot A)$ term in the Lagrangian density. This leads
to a well-defined and exact though Lorentz non invariant propagator.


title:
Comment on "Determination of the chiral coupling constants c_3 and c_4
  in new pp and np partial-wave analyses"

abstract:
  In a recent study [M.C.M. Rentmeester et al., Phys. Rev. C 67, 044001
(2003)], the Nijmegen group reports on the determination of the chiral
low-energy constants (LEC), c_3 and c_4, involved in the 2-pi-exchange part of
the NN amplitude at next-to-next-to-leading order (NNLO) of chiral perturbation
theory. This analysis does not apply the uniquely-determined and
model-independent NN amplitudes at NNLO and uses, instead, amplitudes that are
up 90% smaller. We point out that this flaw produces a large systematic error,
rendering the Nijmegen method unsuitable for a reliable determination of the
LEC.


title: Building Atomic Nuclei with the Dirac Equation

abstract:
  The relevance of the Dirac equation for computations of nuclear structure is
motivated and discussed. Quantitatively successful results for medium- and
heavy-mass nuclei are described, and modern ideas of effective field theory and
density functional theory are used to justify them.


title: Dilute Nuclear Matter in Chiral Perturbation Theory

abstract:
  We use chiral perturbation theory to compute the effective nucleon propagator
in an expansion about low density in the chiral limit. We neglect four-nucleon
interactions and focus on pion exchange. Evaluating the nucleon self-energy on
its mass shell to leading order, we show that the effective nucleon mass
increases by a small amount. We discuss the relevance of our results to the
structure of compact stars.


title: Axial exchange currents and the spin content of the nucleon

abstract:
  In a chiral quark model where chiral symmetry is introduced via a non-linear
sigma model, we evaluate the axial couplings g_A(0), g_A^8(0) and g_A^0(0
)related to the spin structure of the nucleon. Our calculation includes
one-body and two-body axial current and pion absorption operators, which
satisfy the Partial Conservation of Axial Current (PCAC) condition. While
g_A(0) is dominated by the one-body axial current we find significant
corrections due to two-body axial exchange currents in g_A^8(0) and g_A^0(0).
Interestingly, the axial current associated with gluon exchange reduces
g_A^8(0) from 1 to 0.6. Our analysis shows that the so-called ``proton spin
crisis'' can be resolved in a constituent quark model in which PCAC is
satisfied. Furthermore, we use the PCAC constraint in order to determine the
couplings of the eta and eta' mesons to nucleons.


title: Chromodynamic Weibel instabilities in relativistic nuclear collisions

abstract:
  Employing a previously derived formulation, and extending the treatment from
purely transverse modes to wave vectors having a longitudinal component, we
discuss the prospects for the occurrence of Weibel-type color-current
filamentation in high-energy nuclear collisions. Numerical solutions of the
dispersion equation for a number of scenarios relevant to RHIC and LHC suggest
that modes with (predominantly transverse) wave numbers of several hundred MeV
may become moderately agitated during the early collision stage. The emergence
of filamentation helps to speed up the equilibration of the parton plasma and
it may lead to non-statistical azimuthal patterns in the hadron final state.


title: A non-perturbative approach to halo breakup

abstract:
  The theory of weakly bound cluster breakup, like halo nucleus breakup, needs
an accurate treatment of the transitions from bound to continuum states induced
by the nuclear and Coulomb potentials. When the transition probability is not
very small, a non-perturbative framework might be necessary. Nuclear excitation
dominates at small impact parameters whereas the Coulomb potential being long
range acts over a larger impact parameter interval. In this article, we propose
an effective breakup amplitude which meets a number of requirements necessary
for an accurate quantitative description of the breakup reaction mechanism.
Furthermore our treatment gives some insight on the interplay between time
dependent perturbation theory and sudden approximation and it allows to include
the nuclear and Coulomb potentials to all orders within an eikonal-like
framework.


title: Quadrupole correlations and inertial properties of rotating nuclei

abstract:
  The contribution of quantum shape fluctuations to inertial properties of
rotating nuclei has been analyzed for QQ-nuclear interaction using the random
phase approximation (RPA). The different recipes to treat the cranking mean
field plus RPA problem are considered. The effects of the dN=2 quadrupole
matrix elements and the role of the volume conservation condition are
discussed.


title: Chemical and mechanical spinodals a unique liquid-gas instability

abstract:
  We demonstrate that the instabilities of asymmetric nuclear matter at
sub-saturation densities do not present two types of instabilities as usually
discussed but a unique one. The associated order parameter is everywhere
dominated by the isoscalar density and so the transition is of liquid-gas type
even in the so-called chemical instability region.


title: Removing Distortions from Charge Balance Functions

abstract:
  Charge balance functions provide insight into critical issues concerning
hadronization and transport in heavy-ion collisions by statistically isolating
charge/anti-charge pairs which are correlated by charge conservation. However,
distortions from residual interactions and unbalanced charges cloud the
observable. Within the context of simple models, the significance of these
effects is studied by constructing balance functions in both relative rapidity
and invariant relative momentum. Methods are presented for eliminating or
accounting for these distortions.


title: Three particle states and t-exchanges

abstract:
  The multiple particle final states in modern data from $4 \pi$ detector
experiments offer a wealth of information about higher hadronic resonances and
hadron interactions. However, it requires careful analysis to extract model
independent results from those data.


title: Nuclear response functions for the N-N*(1440) transition

abstract:
  Parity-conserving and -violating response functions are computed for the
inclusive electroexcitation of the N*(1440)(Roper) resonance in nuclear matter
modeled as a relativistic Fermi gas. Using various empirical parameterizations
and theoretical models of the N-N*(1440) transition form factors, the
sensitivity of the response functions to details of the structure of the Roper
resonance is investigated. The possibility of disentangling this resonance from
the contribution of Delta electroproduction in nuclei is addressed. Finally,
the contributions of the Roper resonance to the longitudinal scaling function
and to the Coulomb sum rule are also explored.


title: Faddeev calculations for the A=5,6 Lambda-Lambda hypernuclei

abstract:
  Faddev calculations are reported for Lambda-Lambda-5H, Lambda-Lambda-5He and
Lambda-Lambda-6He in terms of two Lambda hyperons plus the respective nuclear
clusters, using Lambda-Lambda central potentials considered in past non-Faddeev
calculations of Lambda-Lambda-6He. The convergence with respect to the
partial-wave expansion is studied, and comparison is made with some of these
Lambda-Lambda hypernuclear calculations. The Lambda-Lambda <--> Xi-N mixing
effect is briefly discussed.


title: Neutrino Interactions in Octet Baryon Matter

abstract:
  Neutrino processes caused by the neutral current are studied in octet baryon
matter. Previous confusion about the baryonic matrix elements of the neutral
current interaction is excluded, and a correct table for them improved by
consideration of the proton spin problem is presented instead.


title: Centrality dependence of $\psi\prime$ over $J/\psi$ : a signal of QGP

abstract:
  If nuclear collisions lead to QGP formation then the ratio of $\psi\prime$
over $J/\psi$ will remain constant with $E_T$ as both $J/\psi$ and $\psi\prime$
are melted in the QGP. On the other hand, if hot hadronic matter is produced,
the ratio will continually fall with $E_T$, as $\psi\prime$'s are more
suppressed in hadronic matter than the $J/\psi$'s. From the existing NA50 Pb+Pb
data, we have constructed the ratio $\sigma(\psi\prime)/\sigma(J/\psi)$, as a
function of $E_T$. The ratio give indication of QGP formation, but definite
conclusion can not be reached. We have also given the prediction for the ratio
at RHIC energy. If QGP is formed at RHIC, it could be detected from the ratio.


title: Spherical Relativistic Hartree theory in a Woods-Saxon basis

abstract:
  The Woods-Saxon basis has been suggested to replace the widely used harmonic
oscillator basis for solving the relativistic mean field (RMF) theory in order
to generalize it to study exotic nuclei. As examples, relativistic Hartree
theory is solved for spherical nuclei in a Woods-Saxon basis obtained by
solving either the Schr\"odinger equation or the Dirac equation (labelled as
SRHSWS and SRHDWS, respectively and SRHWS for both). In SRHDWS, the negative
levels in the Dirac Sea must be properly included. The basis in SRHDWS could be
smaller than that in SRHSWS which will simplify the deformed problem. The
results from SRHWS are compared in detail with those from solving the spherical
relativistic Hartree theory in the harmonic oscillator basis (SRHHO) and those
in the coordinate space (SRHR). All of these approaches give identical nuclear
properties such as total binding energies and root mean square radii for stable
nuclei. For exotic nuclei, e.g., $^{72}$Ca, SRHWS satisfactorily reproduces the
neutron density distribution from SRHR, while SRHHO fails. It is shown that the
Woods-Saxon basis can be extended to more complicated situations for exotic
nuclei where both deformation and pairing have to be taken into account.


title: Exotics and all that

abstract:
  This invited contribution summarizes some of the more important aspects of
exotics. We review theoretical expectations for exotic and nonexotic hybrid
mesons, and briefly discuss the leading experimental candidate for an exotic,
the pi_1(1600).


title: Chiral Symmetry and s-wave Low-Lying Meson-Baryon Resonances

abstract:
  The $s-$wave meson-baryon scattering is analyzed for the isospin-strangeness
$I=1/2, S=0$ and $I=0,S=-1$ sectors, in a Bethe-Salpeter coupled channel
formalism incorporating Chiral Symmetry. For both sectors, four channels have
been considered: $\pi N$, $\eta N$, $K \Lambda$, $K \Sigma$ and $\pi \Sigma$,
$\bar K N$, $\eta \Lambda$, $K \Xi$, respectively. The needed two particle
irreducible matrix amplitudes are taken from lowest order Chiral Perturbation
Theory in a relativistic formalism. There appear undetermined low energy
constants, as a consequence of the renormalization of the amplitudes, which are
obtained from fits to the available data: elastic $\pi N $ phase-shifts, $\pi^-
p \to \eta n$ and $\pi^- p \to K^0 \Lambda$ cross sections and to
$\pi\Sigma\to\pi\Sigma$ mass-spectrum, the elastic $\bar K N \to \bar K N$ and
$ \bar K N\to \pi \Sigma$ $t$--matrices and to the $ K^- p \to \eta \Lambda$
cross section data. The position and residues of the complex poles in the
second Riemann sheet of the scattering amplitude determine masses, widths and
branching ratios of the $S_{11}-$ $N$(1535) and $-N$(1650) and $S_{01}-$
$\Lambda$(1405) and $-\Lambda$(1670) resonances, in reasonable agreement with
experiment. A good overall description of data, from threshold up to around 2
GeV is achieved despite the fact that three-body channels have not been
explicitly included.


title: Pion damping width from SU(2) x SU(2) NJL model

abstract:
  Within the framework of the NJL model, we investigate the modification of the
pion damping width in a hot pion gas for temperatures ranging from 0 to 180
MeV. The pion is found to broaden noticeably at T > 60 MeV. Near the chiral
phase transition T ~ 180 MeV, the pion width is saturated and amounts to 70
MeV. The main contribution to the width comes from pion-pion collisions. Other
contributions are found negligibly small.


title:
Neutron matter at zero temperature with auxiliary field diffusion Monte
  Carlo

abstract:
  The recently developed auxiliary field diffusion Monte Carlo method is
applied to compute the equation of state and the compressibility of neutron
matter. By combining diffusion Monte Carlo for the spatial degrees of freedom
and auxiliary field Monte Carlo to separate the spin-isospin operators, quantum
Monte Carlo can be used to simulate the ground state of many nucleon systems
$(A\alt 100)$. We use a path constraint to control the fermion sign problem. We
have made simulations for realistic interactions, which include tensor and
spin--orbit two--body potentials as well as three-nucleon forces. The Argonne
$v_8'$ and $v_6'$ two nucleon potentials plus the Urbana or Illinois
three-nucleon potentials have been used in our calculations. We compare with
fermion hypernetted chain results. We report results of a Periodic Box--FHNC
calculation, which is also used to estimate the finite size corrections to our
quantum Monte Carlo simulations. Our AFDMC results for $v_6$ models of pure
neutron matter are in reasonably good agreement with equivalent Correlated
Basis Function (CBF) calculations, providing energies per particle which are
slightly lower than the CBF ones. However, the inclusion of the spin--orbit
force leads to quite different results particularly at relatively high
densities. The resulting equation of state from AFDMC calculations is harder
than the one from previous Fermi hypernetted chain studies commonly used to
determine the neutron star structure.


title:
Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC
  and LHC

abstract:
  We study the production of charmonia and charmed hadrons in nucleus-nucleus
collisions at SPS, RHIC, and LHC energies within the framework of the
statistical hadronization model. Results from this model are compared to the
measured yields and centrality dependence of J/psi production at SPS and RHIC
energies. We explore and contrast the centrality dependence of the production
of mesons with open and hidden charm at SPS, RHIC, and LHC. The sensitivity of
the results to various input parameters is analyzed in detail for RHIC energy.


title: Neutrino emission in neutron stars

abstract:
  Neutrino emissivities in a neutron star are computed for the neutrino
bremsstrahlung process. In the first part the electro-weak nucleon-nucleon
bremsstrahlung is calculated in free space in terms of a on-shell $T$-matrix
using a generalized Low energy theorem. In the second part the emissivities are
calculated in terms of the hadronic polarization at the two-loop level. Various
medium effects, such as finite particle width, Pauli blocking in the $T$-matrix
are considered. Compared to the pioneering work of Friman and Maxwell in terms
of (anti-symmetrized) one-pion exchange the resulting emissivity is about a
factor 4 smaller at saturation density.


title: An Infrared Renormalization Group Limit Cycle in QCD

abstract:
  Small increases in the up and down quark masses of QCD would tune the theory
to the critical renormalization group trajectory for an infrared limit cycle in
the three-nucleon system. At critical values of the quark masses, the deuteron
binding energy goes to zero and the triton has infinitely many excited states
with an accumulation point at the 3-nucleon threshold. The ratio of the binding
energies of successive states approaches a universal constant that is close to
515. The proximity of physical QCD to the critical trajectory for this limit
cycle explains the success of an effective field theory of nucleons with
contact interactions only in describing the low-energy 3-nucleon system.


title:
Generalized contour deformation method in momentum space: two-body
  spectral structures and scattering amplitudes

abstract:
  A generalized contour deformation method (GCDM) which combines complex
rotation and translation in momentum space, is discussed. GCDM gives accurate
results for bound, virtual (antibound), resonant and scattering states starting
with a realistic nucleon-nucleon interaction. It provides a basis for full
off-shell $t$-matrix calculations both for real and complex input energies.
Results for both spectral structures and scattering amplitudes compare
perfectly well with exact values for the separable Yamaguchi potential.
Accurate calculation of virtual states in the Malfliet-Tjon and the realistic
CD-Bonn nucleon-nucleon interactions are presented.
  GCDM is also a promising method for the computation of in-medium properties
such as the resummation of particle-particle and particle-hole diagrams in
infinite nuclear matter. Implications for in-medium scattering are discussed.


title:
Nuclear level statistics: extending the shell model theory to higher
  temperatures

abstract:
  The Shell Model Monte Carlo (SMMC) approach has been applied to calculate
level densities and partition functions to temperatures up to ~ 1.5 - 2 MeV,
with the maximal temperature limited by the size of the configuration space.
Here we develop an extension of the theory that can be used to higher
temperatures, taking into account the large configuration space that is needed.
We first examine the configuration space limitation using an
independent-particle model that includes both bound states and the continuum.
The larger configuration space is then combined with the SMMC under the
assumption that the effects on the partition function are factorizable. The
method is demonstrated for nuclei in the iron region, extending the calculated
partition functions and level densities up to T ~ 4 MeV. We find that the
back-shifted Bethe formula has a much larger range of validity than was
suspected from previous theory. The present theory also shows more clearly the
effects of the pairing phase transition on the heat capacity.


title: Event Generator Benchmarking for Proton Radiography Applications

abstract:
  We have benchmarked the QGSM code and event generators of the MARS and LAHET3
codes as potential candidates for high-energy programs to be used in
simulations for the Proton Radiography (PRad) Project. We have compiled from
the literature experimental data on spectra of particles emitted from
proton-induced reactions at incident energies from 30 GeV to 70 GeV on
different nuclei and have performed calculations for all reactions for which we
found data with these three codes without any modifications and using only
default parameters and standard inputs. Our results (514 plots) show that all
three codes describe reasonably most of the studied reactions, though all of
them should be further improved before becoming reliable tools for PRad. We
present here our conclusions concerning the relative roles of different
reaction mechanisms in the production of specific secondary particles. We
comment on the strengths and weaknesses of QGSM, MARS, and LAHET3 and suggest
further improvements to these codes and to other models.


title:
Influence of microscopic transport coefficients on the formation
  probabilities for super-heavy elements

abstract:
  The formation probability is shown to increase by a few orders of magnitude
if microscopic transport coefficients are used rather than those of the common
macroscopic pictures. Quantum effects in collective dynamics are taken into
account through the fluctuating force, as exhibited in diffusion coefficients
for a Gaussian process. In the range of temperatures considered here, they turn
out to be of lesser importance.


title: The Quark-Gluon Plasma in a Finite Volume

abstract:
  The statistical mechanics of quarks and gluons are investigated within the
context of the canonical ensemble. Recursive techniques are developed which
enforce the exact conservation of baryon number, total isospin, electric
charge, strangeness, and color. Bose and Fermi-Dirac statistics are also
accounted for to all orders. The energy, entropy and particle number densities
are shown to be significantly reduced for volumes less than 5 cubic fm.


title: Photoproduction of eta-prime-mesons from the Proton

abstract:
  The presently available data for the reaction ${\gamma}p{\to}\eta^\prime{p}$
are analyzed in terms of a model in which the dominant production mechanism is
the exchange of the vector mesons $\omega$ and $\rho$. To describe the data at
photon energies close to the production threshold we introduce a resonance
contribution due to the well established $S_{11}(1535)$ resonance. Finally we
study the contributions due to nucleon exchange to the $\eta^\prime$
photoproduction and find, that those contributions can be seen at large angles
in the differential cross section.


title:
Mechanisms of multiparticle production in heavy ion collisions at high
  energy

abstract:
  In the framework of a microscopic string model inclusive charged particle
distribution and baryon and antibaryon production are described. The emphasis
is put on high energies (RHIC) where shadowing corrections play a crucial role.
Some recent developments on $J/\psi$ suppression at CERN-SPS are also
discussed. Possible consequences for the crucial issue of thermal equilibration
of the produced system are considered.


title:
Influence of hydrodynamics on the interpretation of the high $p_{T}$
  hadron suppression at RHIC

abstract:
  A hybrid parameterization including contributions of hydrodynamics and of
expectations from the spectral shape observed in p+p collisions is introduced.
This parameterization can successfully describe identified hadron spectra over
a wide range of $p_{T}$ in Au+Au reactions at $\sqrt{s_{NN}}$ = 200 GeV for all
centralities. The parameters of the hydrodynamic source compare reasonably well
to other attempts to describe the spectra. The description is obtained using
one universal suppression factor of the hard scattering component independent
of $p_{T}$ and hadron species. For the fit results obtained the observed
nuclear modification factor for the different particles converges to a
universal suppression behavior for $p_{T} > 6 \mathrm{GeV}/c$.


title: Saturation of nuclear matter and short-range correlations

abstract:
  A fully self-consistent treatment of short-range correlations in nuclear
matter is presented. Different implementations of the determination of the
nucleon spectral functions for different interactions are shown to be
consistent with each other. The resulting saturation densities are closer to
the empirical result when compared with (continuous-choice)
Brueckner-Hartree-Fock values. Arguments for the dominance of short-range
correlations in determining the nuclear-matter saturation density are
presented. A further survey of the role of long-range correlations suggests
that the inclusion of pionic contributions to ring diagrams in nuclear matter
leads to higher saturation densities than empirically observed. A possible
resolution of the nuclear-matter saturation problem is suggested.


title:
Rescattering and finite formation time effects in inclusive and
  exclusive electro-disintegration of nuclei within a relativistic approach: 1.
  The deuteron

abstract:
  The rescattering contribution to the inclusive and exclusive deuteron
electro-disintegration at the values of the Bjorken scaling variable $x=1$, as
well as in the so called {\it cumulative} region ($x>1$) is calculated within a
relativistic approach based on the Feynman diagram formalism taking into
account colour transparency effects by the inclusion of the {\it finite
formation time} (FFT) of the ejected nucleon via the introduction of the
dependence of the scattering amplitude of the ejectile upon its virtuality. In
the cumulative region the FFT effects which result from the real part of the
ejectile propagator are taken into account. It is found that the relative
weight of the rescattering steadily grows with $x$ becoming of the order of
unity at $x>1.4\div 1.5$. At such values of $x$ the finite formation time
effects become fairly visible, which may serve for their study at relatively
small value of the four-momentum transfer$Q^2$. The relativistic rescattering
contribution is compared with the Glauber rescattering, which is shown to be
not valid in the cumulative region starting from $x>1.4$.


title: Spin and Resonant States in QCD

abstract:
  I make the case that the nucleon excitations do not exist as isolated higher
spin states but are fully absorbed by (K/2,K/2)*[(1/2,0)+ (0,1/2)] multiplets
taking their origin from the rotational and vibrational excitations of an
underlying quark--diquark string. The \Delta (1232) spectrum presents itself as
the exact replica (up to \Delta (1600)) of the nucleon spectrum with the K-
clusters being shifted upward by about 200 MeV. QCD inspired arguments support
legitimacy of the quark-diquark string. The above K multiplets can be mapped
(up to form-factors) onto Lorentz group representation spaces of the type
\psi_\mu_1...\mu_K, thus guaranteeing covariant description of resonant states.
The quantum \psi_\mu_1...\mu_K states are of multiple spins at rest, and of
undetermined spins elsewhere.


title: Dynamical Model of Weak Pion Production Reactions

abstract:
  The dynamical model of pion electroproduction has been extended to
investigate the weak pion production reactions. The predicted cross sections of
neutrino-induced pion production reactions are in good agreement with the
existing data. We show that the renormalized(dressed) axial N-$\Delta$ form
factor contains large dynamical pion cloud effects and this renormalization
effects are crucial in getting agreement with the data. We conclude that the
N-$\Delta$ transitions predicted by the constituent quark model are consistent
with the existing neutrino induced pion production data in the $\Delta$ region.


title: Roles des contraintes sur les signaux de transition de phase

abstract:
  Ce papier presente la notion de signal de transition de phase pour un systeme
de taille finie. Il se concentre sur le role des contraintes physiques sur ces
signaux et la robustesse quant au changement d'ensemble statistique. Des
resultats obtenus avec un modele de gaz sur reseau sont presentes en analogie
avec les observations effectuees en collisions d'ions lourds aux energies
intermediaires.


title: Photo and Electrodisintegration of Few Body Systems Revisited

abstract:
  Twenty years after P. Sauer released the state of the art Faddeev solution of
the bound state three nucleon systems, I revisit photo and electrodisengration
of few body systems with a special emphasis on the prospects opened at
Jefferson Laboratory.


title: Gamow-Teller strength distributions in 76Ge and 76Se from deformed QRPA

abstract:
  We study Gamow-Teller strength distributions of 76Ge and 76Se within a
deformed QRPA formalism, which includes residual spin-isospin forces in the
particle-hole and particle-particle channels. We consider two different methods
to construct the quasiparticle basis, a selfconsistent approach based on a
deformed Hartree-Fock calculation with density-dependent Skyrme forces and a
more phenomenological approach based on a deformed Woods-Saxon potential. Both
methods contain pairing correlations in the BCS approach. We discuss the
sensitivity of Gamow-Teller strength distributions to the deformed mean field
and residual interactions.


title:
The algebraic solution of RPA equations for the charged current
  quasielastic neutrino - nucleus scattering

abstract:
  The algebraic solution of RPA equations nucleon re-interactions in the case
of quasi elastic charged current neutrino - nucleus scattering is presented.
Abelian algebra of matrices allows to extract four independent corrections to
cross section separatly.Results of numerical computations are shown.


title: New J/$\psi$ suppression data and the comovers interaction model

abstract:
  New data on the $J/\psi$ suppression both in proton-nucleus and in lead-lead
interactions have been presented recently by the NA50 collaboration. We show
that these data, together with the final ones on sulfur-uranium interactions,
can be described in the framework of the comovers interaction model with a
unique set of three parameters : the nuclear absorption cross-section, the
comovers interaction cross-section and a single (rescaled) absolute
normalization. Expectations for $J/\psi$ suppression at RHIC are also
discussed.


title:
Rescattering effects in incoherent photoproduction of pi-mesons off
  deuterium in the Delta(1232) resonance region

abstract:
  Incoherent photoproduction of pions on the deuteron in the Delta(1232)
resonance region is investigated in order to study the influence of final state
NN and PiN rescattering. For the elementary production operator an effective
Lagrangian model is used which describes well the elementary reaction. The
interactions in the final two-body subsystems are taken in separable form. We
found that the influence of rescattering effects on total and differential
cross sections is significant. Inclusion of such effects leads to an improved
and quite satisfactory agreement with experiment. Since several experiments to
measure the spin asymmetry of the total photoabsorption cross section, which
determines the GDH sum rule, are now being performed or planned at different
laboratories, the contribution of incoherent pion photoproduction to the spin
asymmetry for the deuteron is evaluated with inclusion of NN and PiN
rescattering contributions. The effect of final state rescattering on the spin
asymmetry for the deuteron is found to be quite important and should be
included in forthcoming theoretical studies.


title:
Critical Review of Theoretical Models for Anomalous Effects (Cold
  Fusion) in Deuterated Metals

abstract:
  We briefly summarize the reported anomalous effects in deuterated metals at
ambient temperature, commonly known as "Cold Fusion" (CF), with an emphasis on
important experiments as well as the theoretical basis for the opposition to
interpreting them as cold fusion. Then we critically examine more than 25
theoretical models for CF, including unusual nuclear and exotic chemical
hypotheses. We conclude that they do not explain the data.


title:
Charge-Symmetry Breaking and the Two-Pion-Exchange Two-Nucleon
  Interaction

abstract:
  Charge-symmetry breaking in the nucleon-nucleon force is investigated within
an effective field theory, using a classification of isospin-violating
interactions based on power-counting arguments. The relevant
charge-symmetry-breaking interactions corresponding to the first two orders in
the power counting are discussed, including their effects on the 3He-3H
binding-energy difference. The static charge-symmetry-breaking potential linear
in the nucleon-mass difference is constructed using chiral perturbation theory.
Explicit formulae in momentum and configuration spaces are presented. The
present work completes previously obtained results.


title:
Coherent Description for Hitherto Unexplained Radioactivities by Super-
  and Hyperdeformed Isomeric States

abstract:
  Recently long-lived high spin super- and hyperdeformed isomeric states with
unusual radioactive decay properties have been discovered. Based on these newly
observed modes of radioactive decay, consistent interpretations are suggested
for previously unexplained phenomena seen in nature. These are the Po halos,
the low-energy enhanced 4.5 MeV alpha-particle group proposed to be due to an
isotope of a superheavy element with Z = 108, and the giant halos.


title: Limitation of energy deposition in classical N body dynamics

abstract:
  Energy transfers in collisions between classical clusters are studied with
Classical N Body Dynamics calculations for different entrance channels. It is
shown that the energy per particle transferred to thermalised classical
clusters does not exceed the energy of the least bound particle in the cluster
in its ``ground state''. This limitation is observed during the whole time of
the collision, except for the heaviest system.


title:
Charge symmetry breaking as a probe for the real part of eta--nucleus
  scattering lengths

abstract:
  We demonstrate that one can use the occurrence of charge symmetry breaking as
a tool to explore the eta--nucleus interaction near the eta threshold. Based on
indications that the cross section ratio of pi+ and pi0 production on nuclei
deviates from the isotopic value in the vicinity of the eta production
threshold, due to, e.g., pi0-eta mixing, we argue that a systematic study of
this ratio as a function of the energy would allow to pin down the sign of the
real part of the eta-nucleus scattering length. This sign plays an important
role in the context of the possible existence of eta-nucleus bound states.


title: Chiral Dynamics of the Two \Lambda(1405) States

abstract:
  Using a chiral unitary approach for the meson--baryon interactions, we show
that two octets of J^{\pi}=1/2^- baryon states, which are degenerate in the
limit of exact SU(3) symmetry, and a singlet are generated dynamically. The
SU(3) breaking produces the splitting of the two octets, resulting in the case
of strangeness S=-1 in two poles of the scattering matrix close to the nominal
\Lambda(1405) resonance. These poles are combinations of the singlet state and
the octets. We show how actual experiments see just one effective resonance
shape, but with properties which change from one reaction to another.


title: Vector mesons in a relativistic point-form approach

abstract:
  We apply the point form of relativistic quantum mechanics to develop a
Poincare invariant coupled-channel formalism for two-particle systems
interacting via one-particle exchange. This approach takes the exchange
particle explicitly into account and leads to a generalized eigenvalue equation
for the Bakamjian-Thomas type mass operator of the system. The coupling of the
exchange particle is derived from quantum field theory. As an illustrative
example we consider vector mesons within the chiral constituent quark model in
which the hyperfine interaction between the confined quark-antiquark pair is
generated by Goldstone-boson exchange. We study the effect of retardation in
the Goldstone-boson exchange by comparing with the commonly used instantaneous
approximation. As a nice physical feature we find that the problem of a too
large $\rho$-$\omega$ splitting can nearly be avoided by taking the dynamics of
the exchange meson explicitly into account.


title: Probing Delta structure with pion electromagnetic production

abstract:
  The Dubna-Mainz-Taipei dynamical model for pion electromagnetic production,
which can describe well the existing data from threshold up to 1 GeV photon lab
energy, is presented and used to analyze the recent precision data in the
$\Delta$ region. We find that, within our model, the bare Delta is almost
spherical while the physical Delta is oblate. The deformation is almost
saturated by the pion cloud effects. We further find that up to Q^2 = 4.0
(GeV/c)^2, the extracted helicity amplitude A_{3/2} and A_{1/2} remain
comparable with each other, implying that hadronic helicity is not conserved at
this range of Q^2. The ratio E_{1+}/M_{1+} obtained show, starting from a small
and negative value at the real photon point, a clear tendency to cross zero,
and to become positive with increasing Q^2. This is a possible indication of a
very slow approach toward the pQCD region. Finally, we find that the bare
helicity amplitude A_{1/2} and S_{1/2}, but not A_{3/2}, starts exhibiting the
scaling behavior at about Q^2 \ge 2.5 (GeV/c)^2.


title: Bound state kinetics in high-energy nuclear collisions

abstract:
  A Lorentz covariant kinetic equation for bound states and their constituents
is presented and solved exactly in closed form. It describes in a unified way
dynamical formation and dissociation of states such as quarkonia and
(anti)-deuterons in the excited medium formed with a high-energy heavy-ion
collision.


title: In-medium meson properties and field transformations

abstract:
  Since the existing calculations of the effective meson mass in nuclear medium
involve approximations, it is important to examine whether they satisfy the
general requirement of the equivalence theorem that the physical observables
should be independent of the choice of field variables. We study here
consequences of nucleon field transformations. As an illustrative case we
consider the in-medium effective pion mass calculated for the s-wave
pion-nucleon interaction in the linear density approximation. We demonstrate
that it is necessary to include the Born term explicitly in order that the
effective pion mass should obey the equivalence theorem.


title:
Relativistic predictions of spin observables for exclusive proton
  knockout reactions

abstract:
  Within the framework of the relativistic distorted wave impulse approximation
(DWIA), we investigate the sensitivity of complete sets of polarization
transfer observables for exclusive proton knockout from the 3s$_{1/2}$,
2d$_{3/2}$ and 2d$_{5/2}$ states in $^{208}$Pb, at an incident laboratory
kinetic energy of 202 MeV, and for coincident coplanar scattering angles
($28.0^{\circ}$, $-54.6^{\circ}$), to different distorting optical potentials,
finite-range (FR) versus zero-range (ZR) approximations to the DWIA, as well as
medium-modified meson-nucleon coupling constants and meson masses. Results are
also compared to the nonrelativistic DWIA predictions based on the
Schr\"{o}dinger equation.


title: Mass Shifts through Re-scattering

abstract:
  In this note we present a model that can produce a mass shift in a resonance
due to interference between a scattering amplitude and that amplitude having
rescattering through the resonance.


title: Shape phase transitions and random interactions

abstract:
  The phenomenom of emerging regular spectral features from random interactions
is addressed in the context of the interacting boson model. A mean-field
analysis links different regions of the parameter space with definite geometric
shapes. The results provide a clear and transparent interpretation of the high
degree of order that has been observed before in numerical studies.}


title:
Evaluation of the total photoabsorption cross sections for actinides
  from photofission data and model calculations

abstract:
  We have calculated the fission probabilities for 237-Np, 233,235,238-U,
232-Th, and nat-Pb following the absorption of photons with energies from 68
MeV to 3.77 GeV using the RELDIS Monte-Carlo code. This code implements the
cascade-evaporation-fission model of intermediate-energy photonuclear
reactions. It includes multiparticle production in photoreactions on
intranuclear nucleons, pre-equilibrium emission, and the statistical decay of
excited residual nuclei via competition of evaporation, fission, and
multifragmentation processes. The calculations show that in the GeV energy
region the fission process is not solely responsible for the entire total
photoabsorption cross section, even for the actinides: ~55-70% for 232-Th,
\~70-80% for 238-U, and ~80-95% for 233-U, 235-U, and 237-Np. This is because
certain residual nuclei that are created by deep photospallation at GeV photon
energies have relatively low fission probabilities. Using the recent
experimental data on photofission cross sections for 237-Np and 233,235,238-U
from the Saskatchewan and Jefferson Laboratories and our calculated fission
probabilities, we infer the total photoabsorption cross sections for these four
nuclei. The resulting cross sections per nucleon agree in shape and in
magnitude with each other. However, disagreement in magnitude with
total-photoabsorption cross-section data from previous measurements for nuclei
from C to Pb calls into question the concept of a ``Universal Curve'' for the
photoabsorption cross section per nucleon for all nuclei.


title:
Dilepton decays of nucleon resonances and dilepton production cross
  sections in proton-proton collisions

abstract:
  Relativistic, kinematically complete phenomenological expressions for the
dilepton decay rates of nucleon resonances with arbitrary spin and parity are
derived in terms of the magnetic, electric, and Coulomb transition form
factors. The dilepton decay rates of the nucleon resonances with masses below 2
GeV are estimated using the extended vector meson dominance (eVMD) model for
the transition form factors. The model provides an unified description of the
photo- and electroproduction data and of the vector meson and dilepton decays
of the nucleon resonances. The constraints on the transition form factors from
the quark counting rules are taken into account explicitly. The remaining
parameters of the model are fixed by fitting the available photo- and
electroproduction data and using results of the multichannel partial-wave
analysis of the $\pi N$ scattering. The results are used to describe dilepton
spectra measured at BEVALAC in proton-proton collisions.


title:
Cross sections for the excitation of isovector charge-exchange
  resonances in 208Tl

abstract:
  The Glauber approximation for the treatment of heavy-ion scattering, has
already been shown to give reliable predictions for the reaction cross section
in the particular case of intermediate energy charge-exchange processes. In the
present work, we couple a Glauber-type model to microscopic Random Phase
Approximation calculations of the charge-exchange excitations of $^{208}$Pb.
The aim is to solve the longstanding question whether the very elusive
charge-exchange isovector monopole has been really identified in the past
experiments, or other multipoles were prevalent in the observed spectra.


title:
$\Lambda^+_c$, $\Sigma_c$, $\Xi_c$ and $\Lambda_b$ hypernuclei in the
  quark-meson coupling model

abstract:
  Charmed (and bottom) hypernuclei are studied in the quark-meson coupling
(QMC) model. This completes systematic studies of charmed ($\Lambda_c^+,
\Sigma_c, \Xi_c$), and $\Lambda_b$ hypernuclei in the QMC model. Effects of the
Pauli blocking due to the underlying quark structure of baryons, and the
$\Sigma_c N - \Lambda_c N$ channel coupling are phenomenologically taken into
account at the hadronic level in the same way as those included for strange
hypernuclei. Our results suggest that the $\Sigma_c^{++}$ and $\Xi_c^+$
hypernuclei are very unlikely to be formed, while the $\Lambda_c^+$, $\Xi_c^0$
and $\Lambda_b$ hypernuclei are quite likely to be formed. For the $\Sigma_c^+$
hypernuclei, the formation probability is non-zero though small. A detailed
analysis is also made about the phenomenologically introduced Pauli blocking
and channel coupling effects for the $\Sigma_c^0$ hypernuclei.


title: Mean-Field Description of Fusion Barriers with Skyrme's Interaction

abstract:
  Fusion barriers are determined in the framework of the Skyrme energy-density
functional together with the semi-classical approach known as the Extended
Thomas-Fermi method. The barriers obtained in this way with the Skyrme
interaction SkM* turn out to be close to those generated by phenomenological
models like those using the proximity potentials. It is also shown that the
location and the structure of the fusion barrier in the vicinity of its maximum
and beyond can be quite accurately described by a simple analytical form
depending only on the masses and the relative isospin of target and projectile
nucleus.


title:
Nuclear model effects in Charged Current neutrino--nucleus quasielastic
  scattering

abstract:
  The quasielastic scattering of muon neutrinos on oxygen 16 is studied for
neutrino energies between 200 MeV and 1 GeV using a relativistic shell model.
Final state interactions are included within the distorted wave impulse
approximation, by means of a relativistic optical potential, with and without
imaginary part, and of a relativistic mean field potential. For comparison with
experimental data the inclusive charged--current quasielastic cross section for
$\nu_\mu$--$^{12}C$ scattering in the kinematical conditions of the LSND
experiment at Los Alamos is also presented and briefly discussed.


title: Collectivity, chaos, and computers

abstract:
  Two important pieces of nuclear structure are many-body collective
deformations and single-particle spin-orbit splitting. The former can be
well-described microscopically by simple SU(3) irreps, but the latter mixes
SU(3) irreps, which presents a challenge for large-scale, ab initio
calculations on fast modern computers. Nonetheless, SU(3)-like phenomenology
remains even in the face of strong mixing. The robustness of band structure is
reminiscent of robust, pairing collectivity that arises from random two-body
interactions.


title:
Pseudo + quasi SU(3): Towards a shell-model description of heavy
  deformed nuclei

abstract:
  The pseudo-SU(3) model has been extensively used to study normal parity bands
in even-even and odd-mass heavy deformed nuclei. The use of a realistic
Hamiltonian that mixes many SU(3) irreps has allowed for a successful
description of energy spectra and electromagnetic transition strengths. While
this model is powerful, there are situations in which the intruder states must
be taken into account explicitly. The quasi-SU(3) symmetry is expected to
complement the model, allowing for a description of nucleons occupying normal
and intruder parity orbitals using a unified formalism.


title: Alpha decay and proton-neutron correlations

abstract:
  We study the influence of proton-neutron (p-n) correlations on alpha-decay
width. It is shown from the analysis of alpha Q values that the p-n
correlations increase the penetration of the alpha particle through the Coulomb
barrier in the treatment following Gamow's formalism, and enlarges the total
alpha-decay width significantly.
  In particular, the isoscalar p-n interactions play an essential role in
enlarging the alpha-decay width.
  The so-called "alpha-condensate" in Z > 84 isotopes are related to the strong
p-n correlations.


title: Analysis of a quenched lattice-QCD dressed-quark propagator

abstract:
  Quenched lattice-QCD data on the dressed-quark Schwinger function can be
correlated with dressed-gluon data via a rainbow gap equation so long as that
equation's kernel possesses enhancement at infrared momenta above that
exhibited by the gluon alone. The required enhancement can be ascribed to a
dressing of the quark-gluon vertex. The solutions of the rainbow gap equation
exhibit dynamical chiral symmetry breaking and are consistent with confinement.
The gap equation and related, symmetry-preserving ladder Bethe-Salpeter
equation yield estimates for chiral and physical pion observables that suggest
these quantities are materially underestimated in the quenched theory: |<bar-q
q>| by a factor of two and f_pi by 30%.


title: The Lambda_Q-Lambda_Q Potential

abstract:
  Lattice QCD simulations of the potential between two baryons, each containing
a heavy quark and two light quarks, such as the Lambda_Q-Lambda_Q potential,
will provide insight into the nucleon-nucleon interaction. As one-pion exchange
does not contribute to the Lambda_Q-Lambda_Q potential, the long-distance
behavior is dominated by physics that contributes to the intermediate-range
attraction between two nucleons. We compute the leading long-distance
contributions to the Lambda_Q-Lambda_Q potential in QCD and in
partially-quenched QCD in the low-energy effective field theory.


title: Color Ferromagnetism in Quark Matter

abstract:
  We show a possibility that there exists a color ferromagnetic state in quark
matter, in which a color magnetic field is spontaneously generated. The state
arises between the hadronic state and the color superconducting state when the
density of quarks is varied.Although the state (Savvidy state) has been known
to involve unstablemodes of gluons, we show that the modes compose a quantum
Hall state to stabilize the ferromagnetic state. Such a quantum Hall statecan
arise only when quarks matter is present. We also show that the order of the
phase transition between the state andthe quark gluon plasma is of the first
order.


title:
Antikaon production in A+A collisions at SIS energies within an
  off-shell G-matrix approach

abstract:
  The production and propagation of antikaons -- described by dynamical
spectral functions $A_h(X,\vec{P},M^2)$ as evaluated from a coupled channel
$G$-matrix approach -- is studied for nucleus-nucleus collisions at SIS
energies in comparison to the conventional quasi-particle limit and the
available experimental data using off-shell transport theory. We find that the
$K^-$ spectra for $^{12}C + ^{12}C$ and $^{58}Ni + ^{58}Ni$ at 1.8 A$\cdot$GeV
remain underestimated in the $G$-matrix approach as in the on-shell
quasi-particle approximation whereas the preliminary spectra for $Au + Au$ at
1.5 A$\cdot$GeV are well described in both limits. This also holds
approximately for the $K^-$ rapidity distributions in semi-central collisions
of $Ni+Ni$ at 1.93 A$\cdot$GeV. However, in all limits considered there is no
convincing description of all spectra simultaneously. Our off-shell transport
calculations, furthermore, demonstrate that the strongest in-medium effects
should be found for low antikaon momenta in the center-of-mass frame, since the
deceleration of the antikaons in the attractive Coulomb and nuclear potentials
and the propagation to the on-shell mass induces a net shift and squeezing of
the $K^-$ spectra to the low momentum regime.


title: Narrow Resonances in Effective Field Theory

abstract:
  We discuss the power counting for effective field theories with narrow
resonances near a two-body threshold. Close to threshold, the effective field
theory is perturbative and only one combination of coupling constants is
fine-tuned. In the vicinity of the resonance, a second, ``kinematic''
fine-tuning requires a nonperturbative resummation. We illustrate our results
in the case of nucleon-alpha scattering.


title: Phase transitions and critical points in the rare-earth region

abstract:
  A systematic study of isotope chains in the rare--earth region is presented.
For the chains (144-154)Nd, (146-160)Sm, (148-162)Gd, and (150-166)Dy, energy
levels, E2 transition rates, and two--neutron separation energies are described
by using the most general (up to two--body terms) IBM Hamiltonian. For each
isotope chain a general fit is performed in such a way that all parameters but
one are kept fixed to describe the whole chain. In this region nuclei evolve
from spherical to deformed shapes and a method based on catastrophe theory, in
combination with a coherent state analysis to generate the IBM energy surfaces,
is used to identify critical phase transition points.


title: Relevance of pseudospin symmetry in proton-nucleus scattering

abstract:
  The manifestation of pseudospin-symmetry in proton-nucleus scattering is
discussed. Constraints on the pseudospin-symmetry violating scattering
amplitude are given which require as input cross section and polarization data,
but no measurements of the spin rotation function. Application of these
constraints to p-58Ni and p-208Pb scattering data in the laboratory energy
range of 200 MeV to 800 MeV, reveals a significant violation of the symmetry at
lower energies and a weak one at higher energies. Using a schematic model
within the Dirac phenomenology, the role of the Coulomb potential in
proton-nucleus scattering with regard to pseudospin symmetry is studied. Our
results indicate that the existence of pseudospin-symmetry in proton-nucleus
scattering is questionable in the whole energy region considered and that the
violation of this symmetry stems from the long range nature of the Coulomb
interaction.


title:
Phase shift effective range expansion from supersymmetric quantum
  mechanics

abstract:
  Supersymmetric or Darboux transformations are used to construct local phase
equivalent deep and shallow potentials for $\ell \neq 0$ partial waves. We
associate the value of the orbital angular momentum with the asymptotic form of
the potential at infinity which allows us to introduce adequate long-distance
transformations. The approach is shown to be effective in getting the correct
phase shift effective range expansion. Applications are considered for the
$^1P_1$ and $^1D_2$ partial waves of the neutron-proton scattering.


title: Total Hadron-Hadron Cross Sections at High Energies

abstract:
  We calculate total hadron-hadron cross sections at high energies using the
Low-Nussinov two-gluon model of the Pomeron. The gluon exchange is represented
by a phenomenological potential including screened color-Coulomb, screened
confining, and spin-spin interactions. We use bound-state wave functions
obtained from a potential model for mesons, and a Gaussian wave function for a
proton. We evaluate total cross sections for collisions involving pion, kaon,
rho, phi, D, J/psi, psi', Upsilon, Upsilon', and the proton. We find that the
total cross sections increase with the square of the sum of the root-mean
square radii of the colliding hadrons, but there are variations arising from
the spin-spin interaction. We also calculate the total cross sections of a
mixed-color charmonium state on a pion and on a proton. The dependence of the
total cross section on the size and the color state of the charmonium is
investigated.


title:
Merging the CEM2K and LAQGSM Codes with GEM2 to Describe Fission and
  Light-fragment Production

abstract:
  We present the current status of the improved Cascade-Exciton Model (CEM)
code CEM2k and of the Los Alamos version of the Quark-Gluon String Model code
LAQGSM. To describe fission and light-fragment (heavier than He4) production,
both CEM2k and LAQGSM have been merged with the GEM2 code of Furihata. We
present some results on proton- and deuteron-induced spallation, fission, and
fragmentation reactions predicted by these extended versions of CEM2k and
LAQGSM. We show that merging CEM2k and LAQGSM with GEM2 allows us to describe
many fission and fragmentation reactions in addition to the spallation
reactions which are already relatively well described. Nevertheless, the
standard version of GEM2 does not provide a completely satisfactory description
of complex particle spectra, heavy-fragment emission, and spallation yields,
and is not yet a reliable tool for applications. We conclude that we may choose
to use a model similar to the GEM2 approach in our codes, but it must be
significantly extended and further improved. We observe that it is not
sufficient to analyze only A and Z distributions of the product yields when
evaluating this type of model, as is often done in the literature; instead it
is important to study all the separate isotopic yields as well as the spectra
of light particles and fragments.


title: Particle Production in Heavy Ion Collisions

abstract:
  The status of thermal model descriptions of particle production in heavy ion
collisions is presented. We discuss the formulation of statistical models with
different implementation of the conservation laws and indicate their
applicability in heavy ion and elementary particle collisions. We analyze
experimental data on hadronic abundances obtained in ultrarelativistic heavy
ion collisions, in a very broad energy range starting from RHIC/BNL ($\sqrt
s=200$ A GeV), SPS/CERN ($\sqrt s\simeq 20$ A GeV) up to AGS/BNL ($\sqrt
s\simeq 5$ A GeV) and SIS/GSI ($\sqrt s\simeq 2$ A GeV) to test equilibration
of the fireball created in the collision. We argue that the statistical
approach provides a very satisfactory description of experimental data covering
this wide energy range. Any deviations of the model predictions from the data
are indicated. We discuss the unified description of particle chemical
freeze--out and the excitation functions of different particle species. At SPS
and RHIC energy the relation of freeze--out parameters with the QCD phase
boundary is analyzed. Furthermore, the application of the extended statistical
model to quantitative understanding of open and hidden charm hadron yields is
considered.


title: How to measure the spreading width for decay of superdeformed nuclei

abstract:
  A new expression for the branching ratio for the decay via the E1 process in
the normal-deformed band of superdeformed nuclei is given within a simple
two-level model. Using this expression, the spreading or tunneling width
Gamma^downarrow for superdeformed decay can be expressed entirely in terms of
experimentally known quantities. We show how to determine the tunneling matrix
element V from the measured value of Gamma^downarrow and a statistical model of
the energy levels. The accuracy of the two-level approximation is verified by
considering the effects of the other normal-deformed states.


title: Constraints on spin observables in pbar p --> Lambdabar Lambda

abstract:
  We discuss model-independent inequalities for the spin observables in the
reaction $\bar\mathrm{p}\mathrm{p}\to\bar{\Lambda}\Lambda$, which have been
measured at CERN with a polarised proton target.


title:
Extension of effective lagrangian approach to structure of selected
  nucle i far from stability

abstract:
  In a previous paper, the convergence of a new effective field theory and
density functional theory (EFT/DFT) approach to the description of the nuclear
many-body system was studied. The most sophisticated parameter set (here G1)
determined by Furnstahl, Serot and Tang from a fit along the valley of
stability was found to provide quantitative predictions for total binding
energies and single-particle and single-hole binding energies, spins, and
parities for selected doubly-magic nuclei far from stability. Binding energies
of all the even Sn isotopes (Z=50) were also well described. Here the
calculations are extended to all isotones with magic numbers N=28, 50, 82, 126,
and isotopes with Z=28, 50, 82 with similar predictive results.


title: Near-threshold $\omega$ and $\phi$ meson productions in $pp$ collisions

abstract:
  Using a relativistic effective Lagrangian at the hadronic level,
near-threshold $\omega$ and $\phi$ meson productions in proton proton ($pp$)
collisions, $p p \to p p \omega/\phi$, are studied within the distorted wave
Born approximation. Both initial and final state $pp$ interactions are
included. In addition to total cross section data, both $\omega$ and $\phi$
angular distribution data are used to constrain further the model parameters.
For the $p p \to p p \omega$ reaction we consider two different possibilities:
with and without the inclusion of nucleon resonances. The nucleon resonances
are included in a way to be consistent with the $\pi^- p \to \omega n$
reaction. It is shown that the inclusion of nucleon resonances can describe the
data better overall than without their inclusion. However, the SATURNE data in
the range of excess energies $Q < 31$ MeV are still underestimated by about a
factor of two. As for the $p p \to p p \phi$ reaction it is found that the
presently limited available data from DISTO can be reproduced by four sets of
values for the vector and tensor $\phi NN$ coupling constants. Further
measurements of the energy dependence of the total cross section near threshold
energies should help to constrain better the $\phi NN$ coupling constant.


title:
Accurate Charge-Dependent Nucleon-Nucleon Potential at Fourth Order of
  Chiral Perturbation Theory

abstract:
  We present the first nucleon-nucleon potential at
next-to-next-to-next-to-leading order (fourth order) of chiral perturbation
theory. Charge-dependence is included up to next-to-leading order of the
isospin-violation scheme. The accuracy for the reproduction of the NN data
below 290 MeV lab. energy is comparable to the one of phenomenological
high-precision potentials. Since NN potentials of order three and less are
known to be deficient in quantitative terms, the present work shows that the
fourth order is necessary and sufficient for a reliable NN potential derived
from chiral effective Lagrangians. The new potential provides a promising
starting point for exact few-body calculations and microscopic nuclear
structure theory (including chiral many-body forces derived on the same
footing).


title:
Leakage Effect on J/psi Pt Distributions in Different Centrality Bins
  for Pb-Pb Collisions at E/A=160 GeV

abstract:
  A transport approach including a leakage effect for J/psi's in the transverse
phase space is used to calculate the ratios between the J/psi transverse
momentum distributions in several centrality bins for Pb-Pb collisions at E/A =
160 GeV. From the comparison with the CERN-SPS data, where the centrality is
characterized by the transverse energy Et, the leakage effect is extremely
important in the region of high transverse momentum and high transverse energy,
and both the threshold and the comover models can describe the ratio well for
all centrality bins except the most central one (Et < 100 GeV), for which the
comover model calculation is considerably better than the threshold one.


title:
Meson-Nucleon Vertex Form Factors at Finite Temperature Using a Soft
  Pion Form Factor

abstract:
  The temperature and density dependence of the meson-nucleon vertex form
factors is studied in the framework of thermofield dynamics. Results are
obtained for two rather different nucleon-nucleon potentials: the usual Bonn
potential and the variation with a softer $\pi NN$ form factor, due to Holinde
and Thomas. In general, the results show only a modest degree of sensitivity to
the choice of interaction.


title:
Hartree-Fock approach to nuclear matter and finite nuclei with M3Y-type
  nucleon-nucleon interactions

abstract:
  By introducing a density-dependent contact term, M3Y-type interactions
applicable to the Hartree-Fock calculations are developed. In order to view
basic characters of the interactions, we carry out calculations on the uniform
nuclear matter as well as on several doubly magic nuclei. It is shown that a
parameter-set called M3Y-P2 describes various properties similarly well to the
Skyrme SLy5 and/or the Gogny D1S interactions. A remarkable difference from the
SLy5 and the D1S interactions is found in the spin-isospin properties in the
nuclear matter, to which the one-pion-exchange potential gives a significant
contribution. Affecting the single-particle energies, this difference may play
a certain role in the new magic numbers in unstable nuclei.


title: Mean first passage time for fission potentials having structure

abstract:
  A schematic model of over-damped motion is presented which permits one to
calculate the mean first passage time for nuclear fission. Its asymptotic value
may exceed considerably the lifetime suggested by Kramers rate formula, which
applies only to very special, favorable potentials and temperatures. The
additional time obtained in the more general case is seen to allow for a
considerable increment in the emission of light particles.