title:
Analysis of particle production in ultra-relativistic heavy ion
  collisions within a two-source statistical model

abstract:
  The experimental data on hadron yields and ratios in central lead-lead and
gold-gold collisions at 158 AGeV/$c$ (SPS) and $\sqrt{s} = 130$ AGeV (RHIC),
respectively, are analysed within a two-source statistical model of an ideal
hadron gas. A comparison with the standard thermal model is given. The two
sources, which can reach the chemical and thermal equilibrium separately and
may have different temperatures, particle and strangeness densities, and other
thermodynamic characteristics, represent the expanding system of colliding
heavy ions, where the hot central fireball is embedded in a larger but cooler
fireball. The volume of the central source increases with rising bombarding
energy. Results of the two-source model fit to RHIC experimental data at
midrapidity coincide with the results of the one-source thermal model fit,
indicating the formation of an extended fireball, which is three times larger
than the corresponding core at SPS.


title: Descritpion of Exotic Nuclei Using Continuum Shell Model

abstract:
  In weakly bound exotic nuclei, number of excited bound states or narrow
resonances is small and, moreover, they couple strongly to the particle
continuum. Hence, these systems should be described in the quantum open system
formalism which does not artificially separate the subspaces of (quasi-) bound
and scattering states. The Shell Model Embedded in the Continuum provides a
novel approach which solves this problem. Examples of application in sd-shell
nuclei will be presented.


title: Parameter symmetries of quantum many-body systems

abstract:
  We analyze the occurrence of dynamically equivalent Hamiltonians in the
parameter space of general many-body interactions for quantum systems,
particularly those that conserve the total number of particles. As an
illustration of the general framework, the appearance of parameter symmetries
in the interacting boson model-1 and their absence in the Ginocchio SO(8)
fermionic model are discussed.


title: Scaling in many-body systems and proton structure function

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


title: Three- and Four-body correlations in nuclear matter

abstract:
  Few-nucleon correlations in nuclear matter at finite densities and
temperatures are explored. Using the Dyson equation approach leads to effective
few-body equations that include self energy corrections and Pauli blocking
factors in a systematic way. Examples given are the nucleon deuteron in-medium
reaction rates, few-body bound states including the $\ga$-particle, and
$\ga$-particle condensation.


title: The $\chi$-BS(3) approach

abstract:
  We present the results of the $\chi$-BS(3) approach demonstrating that a
combined chiral and 1/N_c expansion of the Bethe-Salpeter interaction kernel
leads to a good description of the kaon-nucleon, antikaon-nucleon and
pion-nucleon scattering data typically up to laboratory momenta of p_lab~500
MeV. We solve the covariant on-shell reduced coupled channel Bethe-Salpeter
equation with the interaction kernel truncated to chiral order Q^3 and to the
leading order in the 1/N_c expansion


title:
What Does Free Space Lambda-Lambda Interaction Predict for Lambda-Lambda
  Hypernuclei?

abstract:
  Data on Lambda-Lambda hypernuclei provide a unique method to learn details on
the strangeness S =-2 sector of the baryon-baryon interaction. From the free
space Bonn-Julich potentials, determined from data on baryon-baryon scattering
in the S=0,-1 channels, we construct an interaction in the S =-2 sector to
describe the experimentally known Lambda-Lambda hypernuclei. After including
short--range (Jastrow) and RPA correlations, we find masses for these
Lambda-Lambda hypernuclei in a reasonable agreement with data, taking into
account theoretical and experimental uncertainties. Thus, we provide a natural
extension, at low energies, of the Bonn-Julich OBE potentials to the S =-2
channel.


title: A mixed-mode shell-model theory for nuclear structure studies

abstract:
  We introduce a shell-model theory that combines traditional spherical states,
which yield a diagonal representation of the usual single-particle interaction,
with collective configurations that track deformations, and test the validity
of this mixed-mode, oblique basis shell-model scheme on $^{24}$Mg. The correct
binding energy (within 2% of the full-space result) as well as low-energy
configurations that have greater than 90% overlap with full-space results are
obtained in a space that spans less than 10% of the full space. The results
suggest that a mixed-mode shell-model theory may be useful in situations where
competing degrees of freedom dominate the dynamics and full-space calculations
are not feasible.


title:
Final state interaction contribution to the response of confined
  relativistic particles

abstract:
  We report studies of the response of a massless particle confined by a
potential. At large momentum transfer q it exhibits \tilde{y} or equivalently
Nachtmann \xi scaling, and acquires a constant width independent of q. This
width has a contribution from the final state interactions of the struck
particle, which persists in the q->\infty limit. The width of the response
predicted using plane wave impulse approximation is smaller because of the
neglect of final state interactions in that approximation. However, the exact
response may be obtained by folding the approximate response with a function
representing final state interaction effects. We also study the response
obtained from the momentum distribution assuming that the particle is on the
energy shell both before and after being struck. Quantitative results are
presented for the special case of a linear confining potential. In this case
the response predicted with the on-shell approximation has correct values for
the total strength, mean energy and width, however its shape is wrong.


title: Charged kaon condensation in high density quark matter

abstract:
  We show that at asymptotically high densities the ``color-flavor-locked +
neutral kaon condensate'' phase of QCD develops a {\it charged} kaon condensate
through the Coleman-Weinberg mechanism. At densities achievable in neutron
stars a charged kaon condensate forms only for some (natural) values of the low
energy constants describing the low-lying excitations of the ground state.


title:
On polarization of strange baryons in reactions p + p -> p + Lambda^0 +
  K^+ and p + p -> p + Sigma^0 + K^+ near thresholds

abstract:
  Polarization properties of strange baryons produced in pp reactions, p + p ->
p + Lambda^0 + K^+ and p + p -> p + Sigma^0 + K^$, near thresholds of the final
states (p Lambda^0 K^+) and (p Sigma^0 K^+) are analysed relative to
polarizations of colliding protons. The cross sections for pp reactions are
calculated within the effective Lagrangian approach accounting for strong pp
rescattering in the initial state of colliding protons with a dominant
contribution of the one-pion exchange and strong final-state interaction of
daughter hadrons (Eur. Phys. J. A 9, 425 (2000)).


title: Radiative corrections in neutrino-deuterium disintegration

abstract:
  The radiative corrections of order $\alpha$ for the charged and neutral
current neutrino-deuterium disintegration for energies relevant to the SNO
experiment are evaluated. Particular attention is paid to the issue of the
bremsstrahlung detection threshold. It is shown that the radiative corrections
to the total cross section for the charged current reaction are independent of
that threshold, as they must be for consistency, and amount to a slowly
decreasing function of the neutrino energy $E_{\nu}$, varying from $\sim$ 4% at
low energies to $\sim$ 3% at the end of the $^8$B spectrum. The differential
cross section corrections, on the other hand, do depend on the bremsstrahlung
detection threshold. Various choices of the threshold are discussed. It is
shown that for a realistic choice of the threshold, and for the actual electron
energy threshold of the SNO detector, the deduced $^8$B $\nu_e$ flux should be
decreased by $\sim$ 2%. The radiative corrections to the neutral current
reaction are also evaluated.


title:
Analytic proof of the Weinberg theorem for off mass shell and composite
  pions

abstract:
  The Weinberg theorem for the pion-pion scattering is proved analytically in
full detail for quark models in the ladder truncation. The proof is displayed
with Feynman diagrams. The axial and vector Ward identities, for the quark
propagator and for the ladder, exactly cancel any model dependence. Off mass
shell and finite size effects are included in the quark-antiquark pion Bethe
Salpeter vertices. This is applied to compute the isospin 0, 1 and 2 scattering
matrices off the mass shell .


title: Selected Topics in High Energy Semi-Exclusive Electro-Nuclear Reactions

abstract:
  We review the present status of the theory of high energy reactions with
semi-exclusive nucleon electro-production from nuclear targets. We demonstrate
how the increase of transferred energies in these reactions opens a complete
new window in studying the microscopic nuclear structure at small distances.
The simplifications in theoretical descriptions associated with the increase of
the energies are discussed. The theoretical framework for calculation of high
energy nuclear reactions based on the effective Feynman diagram rules is
described in details. The result of this approach is the generalized eikonal
approximation (GEA), which is reduced to Glauber approximation when nucleon
recoil is neglected. The method of GEA is demonstrated in the calculation of
high energy electro-disintegration of the deuteron and A=3 targets.
Subsequently we generalize the obtained formulae for A>3 nuclei. The relation
of GEA to the Glauber theory is analyzed. Then based on the GEA framework we
discuss some of the phenomena which can be studied in exclusive reactions,
these are: nuclear transparency and short-range correlations in nuclei. We
illustrate how light-cone dynamics of high-energy scattering emerge naturally
in high energy electro-nuclear reactions.


title:
Spectrum of 10Be in the basis of the leading representation of the SU(3)
  group

abstract:
  A realization of the approximation of the SU(3) leading representation with
the microscopic Hamiltonian and a nucleon-nucleon interaction is presented in
detail. An effective Hamiltonian reproducing results of calculations with some
known potentials is constructed. It is shown that its structure is quite
similar to that of the triaxial rotator, and the wave functions in the
Elliott's scheme are linear combinations of Wigner's D-functions although they
should be properly normalized.


abstract:
  Coherent Compton scattering on light nuclei in the delta resonance region is
studied in the impulse approximation and is shown to be a sensitive probe of
the in-medium properties of the delta resonance. The elementary amplitude on a
single nucleon is calculated from the unitary K-matrix approach developed
previously. Modifications of the properties of the delta resonance due to the
nuclear medium are accounted for through the self-energy operator of the delta,
calculated from the one-pion loop. The dominant medium effects such as the
Pauli blocking, mean-field modification of the nucleon and delta masses, and
particle-hole excitations in the pion propagator are consistently included in
nuclear matter.


title: Statistical theory of the many-body nuclear system

abstract:
  A recently proposed statistical theory of the mean fields associated with the
ground and excited collective states of a generic many-body system is extended
by increasing the dimensions of the P-space. In applying the new framework to
nuclear matter, in addition to the mean field energies we obtain their
fluctuations as well, together with the ones of the wavefunctions, in first
order of the expansion in the complexity of the Q-space states. The physics
described by the latter is assumed to be random. To extract numerical
predictions out of our scheme we develop a schematic version of the approach,
which, while much simplified, yields results of significance on the size of the
error affecting the mean fields, on the magnitude of the residual effective
interaction, on the ground state spectroscopic factor and on the mixing
occurring between the vectors spanning the P-space.


title: The Z=82 shell closure in neutron-deficient Pb isotopes

abstract:
  Recent mass measurements show a substantial weakening of the binding energy
difference delta_{2p} (Z,N) = E(Z-2,N) - 2 E(Z,N) + E(Z+2,N) in the
neutron-deficient Pb isotopes. As delta_{2p} is often attributed to the size of
the proton magic gap, it might be speculated that the reduction in delta_{2p}
is related to a weakening of the spherical Z=82 shell. We demonstrate that the
observed trend is described quantitatively by self-consistent mean-field models
in terms of deformed ground states of Hg and Po isotopes.


title: Modern Dyson-Schwinger Equation Studies

abstract:
  The dichotomy of the pion as QCD's Goldstone mode and a bound state of
massive constituents is easily understood using the Dyson-Schwinger equations.
That provides the foundation for an efficacious phenomenology, which correlates
the pion's charge radius and electromagnetic form factor with its valence quark
distribution function; and simultaneously provides a Poincare' covariant
description of the nucleon, its form factors and, more recently, meson
photoproduction processes. This well-constrained framework can also be used to
eliminate candidates for an extension of the Standard Model by providing the
relation between current-quark electric dipole moments and that of the neutron


title: HFB Calculations Near the Drip Lines

abstract:
  We present the first set of results of solving the Hartree-Fock-Bogoliubov
equations, which describe the self-consistent mean field theory with pairing
interaction. Calculations for even-even nuclei are carried out on a
two-dimensional axially symmetric lattice, in coordinate space. An important
aspect of our method is the proper representation of the quasi-particle
continuum wavefunctions, which are considered for energies up to 60 MeV. This
stage is essential for a proper description of nuclei near the drip lines, due
to the strong coupling between weakly bound states and the particle continuum
for such nuclei. High accuracy is achieved by representing the operators and
wavefunctions using the technique of basis-splines. Calculations for Sn
isotopes are presented to demonstrate the reliability of the method.


title:
Sensitivity Studies for Extraction of G_E^n from Inclusive and
  Semi-inclusive Electron Scattering on Polarized 3He

abstract:
  The processes \vec{3He}(\vec{e},e') and \vec{3He}(\vec{e},e'n) are
theoretically analyzed with the aim to search for sensitivities in the electric
form factor of the neutron, G_E^n. Faddeev calculations based on the high
precision NN force AV18 and using consistent MEC's are employed. While the
inclusive process is too insensitive, the semi-exclusive one appears promising.


title:
Novel Methods for Determining Effective Interactions for the Nuclear
  Shell Model

abstract:
  The Contractor Renormalization (CORE) method is applied in combination with
modern effective-theory techniques to the nuclear many-body problem. A
one-dimensional--yet ``realistic''--nucleon-nucleon potential is introduced to
test these novel ideas. It is found that the magnitude of ``model-space''
(CORE) corrections diminishes considerably when an effective potential that
eliminates the hard-momentum components of the potential is first introduced.
As a result, accurate predictions for the ground-state energy of the there-body
system are made with relatively little computational effort when both
techniques are used in a complementary fashion.


title:
Ground-state correlations and final state interactions in exclusive
  lepton scattering off few-nucleon systems

abstract:
  The two nucleon emission process off ^3He induced by medium energy electrons
has been theoretically analyzed using realistic three-nucleon wave functions
and taking the final state interaction into account.
  Various kinematical conditions have been considered in order to clarify the
question whether the effects of the final state interaction could be minimized
by a proper choice of the kinematics.


title:
Finite formation time effects in inclusive and semi-inclusive
  electro-disintegration of few-body nuclei

abstract:
  Finite Formation Time (FFT) effects in the exclusive reaction ^4He(e,e'p)^3H
at high values of Q^2 are introduced and discussed. It is shown that the
minimum in the momentum distributions predicted by the Plane Wave Impulse
Approximation (PWIA), which is filled by the Glauber-type Final State
Interaction (FSI), is completely recovered when FFT effects are taken into
account. The semi-inclusive process ^4 He(e,e'p)X is also investigated.


title:
Ground State Correlations and Final State Interactions in Two-Nucleon
  Emission Processes off Few-Nucleon Systems

abstract:
  The two nucleon emission process from ^3He, ^3He(e,e'N_2N_3)N_1, has been
theoretically analyzed using realistic three-nucleon wave functions and taking
the final state interaction into account. Various kinematical conditions have
been considered in order to clarify the question whether the effects of the
final state interaction could be minimized by a proper choice of the kinematics
of the process.


title: Surface diffuseness anomaly in heavy-ion fusion potentials

abstract:
  Recent high precision experimental data for heavy-ion fusion cross sections
at energies in the vicinity of the Coulomb barrier systematically show that a
strikingly large surface diffuseness parameter for a Woods-Saxon potential is
required in order to fit the data. We discuss possible origins for this
anomaly, including the effects of dissipation and the sensitivity of fusion
cross sections to the choice of inter-nuclear potential. Our study suggests
that the frozen density approximation, which is often used in analyses of
heavy-ion reactions, may have to be re-examined for heavy-ion fusion.


title:
Electromagnetic transition form factors and dilepton decay rates of
  nucleon resonances

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 model for the
transition form factors. The model provides a unified description of the photo-
and electroproduction data, the vector meson decays, and the dilepton decays of
the nucleon resonances. The constraints on the transition form factors from the
quark counting rules are taken into account. The 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.
Where experimental data are not available, predictions of the non-relativistic
quark models are used as an input. The vector meson coupling constants of the
magnetic, electric, and Coulomb types are determined. The dilepton widths and
the dilepton spectra from decays of nucleon resonances with masses below 2 GeV
are calculated.


title: Interplay of pairing and multipole interactions in a simple model

abstract:
  The interplay of pairing and other interactions is addressed in this work
using a simple single-j model. We show that enhancements in pairing
correlations observed through studies of the spectra of deformed systems,
moments of inertia, changes in transitional multipole amplitudes, and direct
calculations of the pairing component in the wave function, indicate that even
without explicit matrix elements responsible for pairing, a paired state can
still appear from the kinematic coupling of pairing to deformation and from
other geometrical restrictions that are of extreme importance in mesoscopic
systems. Furthermore, we demonstrate that macroscopic transitions such as
oblate to prolate shape changes can lead to strong dynamic enhancements of
pairing correlations. In this work we emphasize that the pairing condensate has
an important dynamic and kinematic effect on other residual interactions.


title: Vlasov calculations of nuclear ground states

abstract:
  We describe some properties of nuclear ground states using a microscopic
Vlasov approach. We propose a new method to find the energy minimum of the
system enforcing the fermionic nature of the system. Calculations are performed
for two different parametrization of the mean field: a simple momentum
independent Skyrme potential and a momentum dependent one as proposed by Gale,
Bertsch and Das Gupta. We show that the binding energies and radii of nuclei
from $^{16}$O to $^{208}$Pb are reasonably reproduced by opportunely tuning the
surface term. We also made some calculations for neutron rich/poor nuclei.


title:
On differential spectra in the reaction $pp\to K^+\bar K^0 d$ in the
  nearthreshold region

abstract:
  The differential spectra in the reaction $pp\to K^+\bar K^0 d$ for different
reasonable versions of the production amplitude are discussed at the initial
proton energy $T_p=2.645$ GeV.


title: Self-Consistent Harmonic Oscillator Model and Tilted Rotation

abstract:
  The three dimensional harmonic oscillator model including a cranking term is
used for an energy variational calculation. Energy minima are found under
variation of the three oscillator frequencies determining the shape of the
system for given values of the three components of the rotational vector which
determines the orientation of the angular momentum in the intrinsic frame.
Tilted rotations are established by numerical means for triaxial nuclei. The
onset of tilted rotations is related to an instability of the mean field as
verified by the random phase approximation. Analytic expressions are derived
for the critical rotational frequencies associated with the mean field
instability.


title: Quark-hadron duality and the nuclear EMC effect

abstract:
  Recent data on polarized proton knockout reactions off He-4 nuclei suggest a
small but nonzero modification of proton electromagnetic form factors in
medium. Using model independent relations derived on the basis of quark-hadron
duality, we relate the medium modification of the form factors to the
modification at large x of the deep-inelastic structure function of a bound
proton. This places strong constraints on models of the nuclear EMC effect
which assume a large deformation of the intrinsic structure of the nucleon in
medium.


title:
J/$\psi$ suppression as a function of the energy of the zero degree
  calorimeter : can it discriminate between deconfining and comovers
  interaction models ?

abstract:
  The ratio of $J/\psi$ over Drell-Yan cross-sections as a function of the
energy of the zero degree calorimeter in $Pb$ $Pb$ collisions has been computed
in a comovers interaction model and compared with the results of a deconfining
model. The predictions of the two models are different both for peripheral
events and for very central ones. These differences are analyzed and the
results of the models confronted with available data -- not only for $Pb$ $Pb$
but also for $pA$ and $SU$ collisions.


title: N* Masses from QCD Sum Rules

abstract:
  We report N* masses in the spin-1/2 and spin-3/2 sectors using the method of
QCD Sum Rules. They are based on three independent sets derived from
generalized interpolating fields. The predictive ability of each sum rule is
examined by a Monte-Carlo based analysis procedure in which all three
phenomenological parameters (mass, coupling, threshold) are extracted
simultaneously. A parity projection technique is also studied.


title: Gluonic excitations in lattice QCD: A brief survey

abstract:
  Our current knowledge about glueballs and hybrid mesons from lattice QCD
simulations is briefly reviewed.


title: Gluon Shadowing and Hadron Production at RHIC

abstract:
  Hadron multiplicity in the central rapidity region of high-energy heavy-ion
collisions is investigated within a two-component mini-jet model which consists
of soft and semi-hard particle production. The hard contribution from mini-jets
is reevaluated using the latest parameterization of parton distributions and
nuclear shadowing. The energy dependence of the experimental data from RHIC
requires a strong nuclear shadowing of the gluon distribution in this model.
The centrality dependence of the hadron multiplicity at $\sqrt{s}=130$ GeV is
reproduced well with the impact-parameter dependent parton shadowing. However,
energy variation of the centrality dependence is needed to distinguish
different particle production mechanisms such as the parton saturation model.


title: Relativistic quantum transport theory for heavy-ion collisions

abstract: This paper was withdrawn by the author.


title: New Class of Compact Stars at High Density

abstract:
  We discuss the equation of state for cold, dense quark matter in perturbation
theory, and how it might match onto that of hadronic matter. Certain choices of
the renormalization scale correspond to a strongly first order chiral
transition, and may generate a new class of small and very dense quark stars.
The results for the mass-radius relation are compatible with the recent
determination of the mass and the radius of an isolated neutron star by Pons et
al.


title:
Microscopic description of Coulomb and nuclear excitation of multiphonon
  states in $^{40}$Ca + $^{40}$Ca collisions

abstract:
  We calculate the inelastic scattering cross sections to populate one- and
two-phonon states in heavy ion collisions with both Coulomb and nuclear
excitations. Starting from a microscopic approach based on RPA, we go beyond it
in order to treat anharmonicities and non-linear terms in the exciting field.
These anharmonicities and non-linearities are shown to have important effects
on the cross sections both in the low energy part of the spectrum and in the
energy region of the Double Giant Quadrupole Resonance. By properly introducing
an optical potential the inelastic cross section is calculated semiclassically
by integrating the excitation probability over all impact parameters. A
satisfactory agreement with the experimental results is obtained.


title: Dynamical moment of inertia and quadrupole vibrations in rotating nuclei

abstract:
  The contribution of quantum shape fluctuations to inertial properties of
rotating nuclei has been analysed within the self-consistent one-dimensional
cranking oscillator model. It is shown that in even-even nuclei the dynamical
moment of inertia calculated in the mean field approximation is equivalent to
the Thouless-Valatin moment of inertia calculated in the random phase
approximation if and only if the self-consistent conditions for the mean field
are fulfilled.


title: Scaling in Relativistic Thomas-Fermi Approach for Nuclei

abstract:
  By using the scaling method we derive the virial theorem for the relativistic
mean field model of nuclei treated in the Thomas-Fermi approach. The
Thomas-Fermi solutions statisfy the stability condition against scaling. We
apply the formalism to study the excitation energy of the breathing mode in
finite nuclei with several relativistic parameter sets of common use.


title:
Scaling Calculation of Isoscalar Giant Resonances in Relativistic
  Thomas-Fermi Theory

abstract:
  We derive analytical expressions for the excitation energy of the isoscalar
giant monopole and quadrupole resonances in finite nuclei, by using the scaling
method and the extended Thomas-Fermi approach to relativistic mean field
theory. We study the ability of several non-linear sigma-omega parameter sets
of common use in reproducing the experimental data. For monopole oscillations
the calculations agree better with experiment when the nuclear matter
incompressibility of the relativistic interaction lies in the range 220-260
MeV. The breathing-mode energies of the scaling method compare satisfactorily
with those obtained in relativistic RPA and time-dependent mean field
calculations. For quadrupole oscillations all the analyzed non-linear parameter
sets reproduce the empirical trends reasonably well.


title: Muon capture in hydrogen

abstract:
  Theoretical difficulties in reconciling the measured rates for ordinary and
radiative muon capture are discussed, based on heavy-baryon chiral perturbation
theory. We also examine ambiguity in our analysis due to the formation of
p$\mu$p molecules in the liquid hydrogen target.


title: Charged multiplicities and $J/\psi$ suppression at SPS and RHIC energies

abstract:
  Charged multiplicities in nucleus--nucleus collisions are calculated in the
Dual Parton Model taking into account shadowing corrections. Its dependence on
the number of collisions and participants is analyzed and found in agreement
with experiment at SPS and RHIC energies. Using these results, we compute the
$J/\psi$ suppression at SPS as a function of the transverse energy and of the
energy of the zero degree calorimeter. Predictions for RHIC are presented.


title: The Solar $hep$ Processes in Effective Field Theory

abstract:
  By combining effective field theory with the standard nuclear physics
approach (SNPA) we obtain a high-precision estimate of the $S$ factor for the
solar $hep$ process. The accurate wave functions available in SNPA are used to
evaluate the nuclear matrix elements for the transition operators that result
from chiral perturbation theory (ChPT). All the contributions up to \nlo3 in
ChPT are included. The resulting parameter-free, error-controlled prediction
is: $S(hep)=(8.6 \pm 1.3)\times 10^{-20}$ keV-b.


title: Duality in strong interactions

abstract:
  By introducing Q^2-dependence in resonance-reggeon "soft" dual models with
nonlinear trajectories, they are extended to "hard" processes, sharing the
property of parton-hadron duality. The resulting object is a two-component
complex function of three variables - s,t and Q^2, reducing to classical dual
models on the mass shell and to deep inelastic structure functions, or Compton
scattering amplitudes - forward and non-forward - otherwise. As a consequence,
the small- and large-x behavior of the structure functions is also related by
duality. This duality relation holds for each o components (diffractive and
non-diffractive for the amplitude or singlet and non-singlet for the structure)
separately.


title: Boundary of Nuclear Physics and QCD

abstract:
  Recent progress in lattice QCD, combined with the imminent advent of a new
generation of dedicated supercomputers and advances in chiral extrapolation
mean that the next few years will bring quite novel insights into hadron
structure. We review some of the recent highlights in this field, the questions
which might be addressed and the experiments which may be expected to stretch
that understanding to its limits. Only with a sound understanding of hadron
structure can one hope to explore the fundamental issue of how that structure
may change at finite density (or temperature). We explore potential future
insights from lattice QCD into the phenomenon of nuclear saturation and a very
important hint from recent data of a change in the structure of a bound
nucleon.


title:
Semi-classical Characters and Optical Model Description of Heavy Ion
  Scattering, Direct Reactions, and Fusion at Near-barrier Energies

abstract:
  An approach is proposed to calculate the direct reaction (DR) and fusion
probabilities for heavy ion collisions at near-Coulomb-barrier energies as
functions of the distance of closest approach D within the framework of the
optical model that introduces two types of imaginary potentials, DR and fusion.
The probabilities are calculated by using partial DR and fusion cross sections,
together with the classical relations associated with the Coulomb trajectory.
Such an approach makes it possible to analyze the data for angular
distributions of the inclusive DR cross section, facilitating the determination
of the radius parameters of the imaginary DR potential in a less ambiguous
manner. Simultaneous $\chi^{2}$-analyses are performed of relevant data for the
$^{16}$O+$^{208}$Pb system near the Coulomb-barrier energy.


title:
Odd-Even Staggering in Octupole Bands of Actinides and Rare Earths:
  Systematics of "Beat" Patterns

abstract:
  ``Beat'' patterns are shown to appear in the octupole bands of several
actinides and rare earths, their appearance being independent from the formula
used in order to isolate and demonstrate them. It is shown that the recent
formalism, making use of discrete approximations to derivatives of the
transition energies (or of the energy levels) gives results consistent with the
traditional formulae. In both regions it is seen that the first vanishing of
the staggering occurs at higher values of the angular momentum I in nuclei
exhibiting higher staggering at low I. Since these nuclei happen to be good
rotators, the observed slow decrease of the amplitude of the staggering with
increasing I is in good agreement with the parameter independent predictions of
the su(3) (rotational) limit of several algebraic models. In the actinides it
has been found that within each series of isotopes the odd-even staggering
exhibits minima at N=134 and N=146, while a local maximum is shown at N=142,
these findings being in agreement with the recent suggestion of a secondary
maximum of octupole deformation around N=146.


title: Spectral Function of Quarks in Quark Matter

abstract:
  We investigate the spectral function of light quarks in infinite quark matter
using a simple, albeit self-consistent model. The interactions between the
quarks are described by the SU(2) Nambu--Jona-Lasinio model. Currently mean
field effects are neglected and all calculations are performed in the chirally
restored phase at zero temperature. Relations between correlation functions and
collision rates are used to calculate the spectral function in an iterative
process.


title:
Study of Nucleon Resonances with Double Polarization Observables of Pion
  Photoproduction

abstract:
  The role of the nucleon resonances in the double polarization observables of
pion photoproduction is investigated by using the resonance parameters
predicted by Capstick and Roberts. As an example, we show that the
not-well-determined two-star resonance N$^{-}_{3/2}$(1960) can be examined by
performing experiments on beam-recoil polarization at large angles.


title:
$Q^2$-dependence of backward pion multiplicity in neutrino-nucleus
  interactions

abstract:
  The production of pions emitted backward in inelastic neutrino-nucleus
interactions is analyzed within the impulse approximation in the framework of
the dual parton model. We focus on the $Q^2$-dependence of the multiplicity of
negative pions, normalized to the total cross section of the reaction $\nu + A
\to \mu + X$. The inclusion of planar (one-Reggeon exchange) and cylindrical
(one-Pomeron exchange) graphs leads to a multiplicity that decreases as $Q^2$
increases, in agreement with recent measurements carried out at CERN by the
NOMAD collaboration. A realistic treatment of the high momentum tail of the
nucleon distribution in a nucleus also allows for a satisfactory description of
the semi-inclusive spectrum of backward pions.


title:
Surface Incompressibility from Semiclassical Relativistic Mean Field
  Calculations

abstract:
  By using the scaling method and the Thomas-Fermi and Extended Thomas-Fermi
approaches to Relativistic Mean Field Theory the surface contribution to the
leptodermous expansion of the finite nuclei incompressibility has been
self-consistently computed. The validity of the simplest expansion, which
contains volume, volume-symmetry, surface and Coulomb terms, is examined by
comparing it with self-consistent results of the finite nuclei
incompressibility for some currently used non-linear sigma-omega parameter
sets. A numerical estimate of higher-order contributions to the leptodermous
expansion, namely the curvature and surface-symmetry terms, is made.


title: Statistical Fluctuations as Probes of Dense Matter

abstract:
  The use of statistical fluctuations as probes of the microscopic dynamics of
hot and dense hadronic matter is reviewed. Critical fluctuations near the
critical point of QCD matter are predicted to enhance fluctuations in pionic
observables. Chemical fluctuations, especially those of locally conserved
quantum numbers, such as electric charge and baryon number, can probe the
nature of the carriers of these quantum numbers in the dense medium.


title: Mean-field analysis of interacting boson models with random interactions

abstract:
  We investigate the origin of the regular features observed in numerical
studies of the interacting boson model with random interactions, in particular
the dominance of L=0 ground states and the occurrence of vibrational and
rotational band structures. It is shown that all of these properties can be
interpreted and explained in terms of a Hartree-Bose mean-field analysis, in
which different regions of the parameter space are associated with geometric
shapes. The same conclusions hold for the vibron model.


title: Playing Dice with Nuclei: Pattern out of Randomness?

abstract:
  We review recent results obtained in numerical studies of the nuclear shell
model and the interacting boson model with random interactions, in particular
the dominance of ground states with L=0 and the occurrence of vibrational and
rotational bands. We discuss some possible explanations of the origin of these
regular features.


title:
Coulomb-Nuclear Coupling and Interference Effects in the Breakup of Halo
  Nuclei

abstract:
  Nuclear and Coulomb breakup of halo nuclei have been treated often as
incoherent processes and structure information have been extracted from their
study. The aim of this paper is to clarify whether interference effects and
Coulomb-nuclear couplings are important and how they could modify the simple
picture previously used.
  We calculate the neutron angular and energy distributions by using first
order perturbation theory for the Coulomb amplitude and an eikonal approach for
the nuclear breakup. This allows for a simple physical interpretation of the
results which are mostly analytical. Our formalism includes the effect of the
nuclear distortion of the neutron wave function on the Coulomb amplitude. This
leads to a Coulomb-nuclear coupling term derived here for the first time which
gives a small contribution for light targets but is of the same order of
magnitude as nuclear breakup for heavy targets. The overall interference is
constructive for light to medium targets and destructive for heavy targets.
Thus it appears that Coulomb breakup experiments need to be analyzed with more
accurate models than those used so far.


title:
Nuclear Ground State Observables and QCD Scaling in a Refined
  Relativistic Point Coupling Model

abstract:
  We present results obtained in the calculation of nuclear ground state
properties in relativistic Hartree approximation using a Lagrangian whose
QCD-scaled coupling constants are all natural (dimensionless and of order 1).
Our model consists of four-, six-, and eight-fermion point couplings (contact
interactions) together with derivative terms representing, respectively, two-,
three-, and four-body forces and the finite ranges of the corresponding mesonic
interactions. The coupling constants have been determined in a self-consistent
procedure that solves the model equations for representative nuclei
simultaneously in a generalized nonlinear least-squares adjustment algorithm.
The extracted coupling constants allow us to predict ground state properties of
a much larger set of even-even nuclei to good accuracy. The fact that the
extracted coupling constants are all natural leads to the conclusion that QCD
scaling and chiral symmetry apply to finite nuclei.


title: Anharmonic vibrations in nuclei

abstract:
  In this letter, we show that the non-linearitites of large amplitude motions
in atomic nuclei induce giant quadrupole and monopole vibrations. As a
consequence, the main source of anharmonicity is the coupling with
configurations including one of these two giant resonances on top of any state.
Two-phonon energies are often lowered by one or two MeV because of the large
matrix elements with such three phonon configurations. These effects are
studied in two nuclei, 40Ca and 208Pb.


title: Exploring Quark Matter

abstract:
  These proceedings contain research results presented during the Workshops
"Quark Matter in Astro- and Particle Physics" held at the University of
Rostock, November 27-29, 2000 and "Dynamical Aspects of the QCD Phase
Transition" held at the ECT* in Trento, March 12-15, 2001.


title: Electromagnetic structure of the deuteron

abstract:
  Recent measurements of the deuteron electromagnetic structure functions A, B,
and $T_{20}$ extracted from high energy elastic $ed$ scattering, and the cross
sections and asymmetries extracted from high energy photodisintegration
$\gamma+d\to n+p$, are reviewed and compared to theory. The theoretical
calculations range from nonrelativistic and relativistic models using the
traditional meson and baryon degrees of freedom, to effective field theories,
to models based on the underlying quark and gluon degrees of freedom of QCD,
including nonperturbative quark cluster models and perturbative QCD. We review
what has been learned from these experiments, and discuss why elastic $ed$
scattering and photodisintegration seem to require very different theoretical
approaches, even though they are closely related experimentally.


title: Future galactic supernova neutrino signal: What can we learn?

abstract:
  The next supernova in our galaxy will be detected by a variety of neutrino
detectors. In this lecture I discuss the set of observables needed to constrain
the models of supernova neutrino emission. They are the flux normalizations,
and average energies, of each of the three expected components of the neutrino
flux: $\nu_e$, $\bar{\nu}_e$, and $\nu_x$ (all the other four flavors
combined). I show how the existing, or soon to be operational, neutrino
detectors will be able to determine the magnitude of these observables, and
estimate the corresponding rates.


title:
A New Description of Nuclear Rotational Motion in terms of Intrinsic
  Pair Mode

abstract:
  A new method describing nuclear rotational motion microscopically is
proposed. We extract the rotational Hamiltonian by introducing the intrinsic
pair modes which commute with the rotational mode. Thereby the rotational mode
is not treated as zero energy mode in contrast with the conventional RPA
formalism so that we circumvent the difficulty related with infrared
divergence. The wave function is constructed by angular momentum projection on
each intrinsic state. Without numerical integration for projection we calculate
the matrix elements analytically under a certain approximation. The numerical
calculations are carried out to illustrate the applicability of our method and
they show that our method works well.


title:
Intrinsic Pair Operators and the Number-conserved Treatment of Pairing
  Correlations in Nuclei

abstract:
  By introducing the intrinsic pair operators which commute with number
fluctuation operator, a new formalism is given for the number-conserving
description of the pairing correlations. The difficulty in the conventional RPA
treatment for pairing rotation is removed.


title:
Sideward Peak of Intermediate Mass Fragments in High Energy Proton
  Induced Reactions

abstract:
  Intermediate mass fragment (IMF) formation in the 12 GeV proton induced
reaction on Au target is analyzed by using a combined framework of a transport
model (JAM/MF) and a newly developed non-equilibrium percolation (NEP) model.
In this model, we can well reproduce the mass distribution of fragments. In
addition, the sideward peaked angular distribution would emerge under the
condition that the fragment formation time is very short, around 20 fm/c.
Within this short time period, the un-heated part of the residual nucleus is
kept to have doughnut shape, then the Coulomb repulsion from this shape
strengthens the sideward peak of IMF.


title:
Discerning the neutron density distribution of 208Pb from nucleon
  elastic scattering

abstract:
  We seek a measure of the neutron density of 208Pb from analyses of
intermediate energy nucleon elastic scattering. The pertinent model for such
analyses is based on coordinate space nonlocal optical potentials obtained from
model nuclear ground state densities. Those potentials give predictions of
integral observables and of angular distributions which show sensitivity to the
neutron density. When compared with experiment, and correlated with analyses of
electron scattering data, the results suggest that 208Pb has a neutron skin
thickness ~0.17 fm.


title: Flavour asymmetry of anti-quarks in nuclei

abstract:
  A novel nuclear effect on the flavour asymmetry of anti-quarks in the nucleon
bound in a nucleus is discussed in terms of the meson cloud model and the Pauli
exclusion principle. It is expected that the flavour asymmetry is enhanced in a
nucleus.


title: Precursor of Color Superconductivity in Hot Quark Matter

abstract:
  We investigate possible precursory phenomena of color superconductivity in
quark matter at finite temperature T with use of a simple Nambu-Jona-Lasinio
model. It is found that the fluctuating pair field exists with a prominent
strength even well above the critical temperature T_c. We show that the
collective pair field has a complex energy located in the second Riemann sheet,
which approaches the origin as T is lowered to T_c. We discuss the possible
relevance of the precursor to the observables to be detected in heavy ion
collisions.

categories: nucl-th cond-mat.supr-con hep-ph nucl-ex


title: Pi N -> Omega N in a Coupled-Channel Approach

abstract:
  We describe the pi N -> omega N cross section from threshold to a center of
mass energy of 2 GeV in a unitary coupled-channel model and analyze it in terms
of rescattering and resonance excitations. The amplitude is mainly composed of
D13, P13, and P11 contributions, where the D13 dominates over the complete
considered energy range. We also outline the generalization of the standard
partial-wave formalism necessary for the decomposition of the omega N final
state.


title: What is the Correct pi^- p -> omega n Cross Section at Threshold?

abstract:
  The pi^- p -> omega n threshold cross section measured in the seventies
resisted up to now a consistent theoretical description in line with
experiment, mainly caused by too large Born contributions. This led to a
discussion in the literature about the correctness of the extraction of these
data points. We show that the extraction method used in these references is
indeed correct and that there is no reason to doubt the correctness of these
data.


title: From Light Nuclei to Nuclear Matter. The Role of Relativity?

abstract:
  The success of non-relativistic quantum dynamics in accounting for the
binding energies and spectra of light nuclei with masses up to A=10 raises the
question whether the same dynamics applied to infinite nuclear matter agrees
with the empirical saturation properties of large nuclei.The simple unambiguous
relation between few-nucleon and many-nucleon Hamiltonians is directly related
to the Galilean covariance of nonrelativistic dynamics. Relations between the
irreducible unitary representations of the Galilei and Poincare groups indicate
thatthe ``nonrelativistic'' nuclear Hamiltonians may provide sufficiently
accurate approximations to Poincare invariant mass operators. In relativistic
nuclear dynamics based on suitable Lagrangeans the intrinsic nucleon parity is
an explicit, dynamically relevant, degree of freedom and the emphasis is on
properties of nuclear matter. The success of this approach suggests the
question how it might account for the spectral properties of light nuclei.


title:
Probing of nucleon mesonic structure by means of quasi-elastic knock-out
  processes like $p+e\to e'+\pi+n$

abstract:
  The momentum distributions of pions and $\rho$-mesons in the nucleon are
extracted from experiment. Perspectives of the quark microscopic theory of
mesonic cloud are outlined.


title: Resonances and Quantum Scattering for the Morse Potential as a Barrier

abstract:
  Quantum scattering in the presence of a potential valley followed by a
barrier is examined for the case of a Morse potential, for which exact analytic
solutions to the Schr\UNICODE{0xf6}dinger equation are known in terms of
confluent hypergeometric functions. For our application the potential is
characterized by three parameters: the height of the barrier, the distance of
the barrier from the origin of the radial variable $r,$ and a diffuseness
parameter. The wave function, defined in the interval $0\leq r<\infty ,$ is
required to vanish at $r=0,$ and hence represents a radial partial wave for
zero angular momentum. The vanishing at $r=0$ requires a special combination of
hypergeometric functions, and can lead to resonances for incident energies
which occur below the top of the barrier. Numerical values for the analytical
phase shifts are presented in and outside the resonant regions, and the
corresponding properties of the scattering S-matrix are examined in the complex
momentum plane, mainly for pedagogical reasons. The validity of the
Breit-Wigner approximation to the resonant phase shifts is tested, and the
motion of a ''resonant'' wave packet slowly leaking out of the valley region is
also displayed.


title:
A possible quark origin of two-pion emission in $e+N$ and $N+N$
  collisions

abstract:
  The constituent quark model has been taken as a starting point for
investigation of one- and two-pion emissions. A wide range of oservables has
been evaluated in the framework of the $^3P_0$ model. Comparison of the results
with the data (when it is possible) shows an approximate agreement.


title: Note on the Deformed Boson Scheme in Time-Dependent Variational Method

abstract:
  The Holstein-Primakoff representation for the su(2)-algebra is derived in the
deformed boson scheme. The following two points are discussed : (i) connection
between a simple Hamiltonian and the Hamiltonian obeying the su(2)-algebra such
as Lipkin model and (ii) derivation of the Hamiltonian for describing the
damped and amplified motion for the su(2)-boson model.


title: Goldstone Boson's Valence-Quark Distribution

abstract:
  Dynamical chiral symmetry breaking (DCSB) is one of the keystones of
low-energy hadronic phenomena. Dyson-Schwinger equations provide a
model-independent quark-level understanding and correlate that with the
behaviour of the pion's Bethe-Salpeter amplitude. This amplitude is a core
element in the calculation of pion observables and combined with the
dressed-quark Schwinger function required by DCSB it yields a valence-quark
distribution function for the pion that behaves as (1-x)^2 for x~1, in
accordance with perturbative analyses. This behaviour can be verified at
contemporary experimental facilities.


title: Recent results on hadron form factors

abstract:
  We discuss the recent data on the electric proton form factor, obtained at
JLab, which show a spectacular deviation from the commonly assumed dipole
behavior. We discuss the implication of these results on the deuteron structure
and on the neutron electric form factor: at relatively large $Q^2$ a revision
of the deuteron models may be required, and the neutron electric form factor
might become even larger than the proton electric form factor.


title:
Polarization phenomena for meson production in nucleon-nucleon
  collisions

abstract:
  We analyze polarization phenomena for pseudoscalar and vector mesons
production in nucleon-nucleon collisions. We identify three energy regions
corresponding to different physics and different approaches in the analysis of
polarization effects. In the threshold region, characterized by the S-wave
production for all final particles, the general symmetry properties of strong
interaction can be applied. The region of intermediate energies, T=2-4 GeV, is
characterized by the essential role of central i.e. non-peripheral collisions,
where only a small number of s-channel states with definite quantum numbers,
${\cal J}^P=1^-$ and $2^+$, contribute. At higher energies, T $\ge $10 GeV, the
leading mechanism is the diffractive dissociation and it is especially
interesting for baryon spectroscopy. The transition to this region is an open
field for experimental research at the Nuclotron.


title: Chiral NN model and Ay puzzle

abstract:
  We analyze the results by chiral NN models for the two-nucleon system and
calculate the predictions for the nucleon vector analyzing power of elastic
nucleon-deuteron (Nd) scattering, Ay, by these models. Our conclusion is that a
QUANTITATIVE chiral two-nucleon potential does not resolve the Nd Ay puzzle
(when only two-body forces are included).


title:
Effects of shell structure in reactions leading to the same compound
  nucleus or different isotopes

abstract:
  The role of the entrance channel in fusion-fission reactions was studied by
the theoretical analysis of the experimental evaporation residue excitation
functions for reactions leading to the same compound nucleus. The evaporation
residues cross sections for xn-channels were calculated in the frame of the
combined dinuclear system concept and advanced statistical model. The revealed
differences between experimental data on the evaporation residues in the
^{40}Ar+^{176}Hf, ^{86}Kr + ^{130}Xe and ^{124}Sn + ^{92}Zr reactions leading
to the ^{216}Th^* compound nucleus are explained by the different spin
distributions of compound nuclei which are formed. It is shown that the
intrinsic fusion barrier B^*_{fus} and size of potential well are different for
every entrance channel.


title:
Elliptic flow in intermediate energy heavy ion collisions and in-medium
  effects

abstract:
  We investigate elliptic flow in heavy ion collisions at intermediate
energies. In doing this, we implement and use a lattice-Hamiltonian model of
the nuclear interaction and we also study the effect of in-medium
nucleon-nucleon cross sections that follow consistently from the
momentum-dependence of the nuclear mean field.


title:
Global Properties of Spherical Nuclei Obtained from
  Hartree-Fock-Bogoliubov Calculations with the Gogny Force

abstract:
  Selfconsistent Hartree-Fock-Bogoliubov (HFB) calculations have been performed
with the Gogny force for nuclei along several constant Z and constant N chains,
with the purpose of extracting the macroscopic part of the binding energy using
the Strutinsky prescription. The macroscopic energy obtained in this way is
compared to current liquid drop formulas. The evolution of the single particle
levels derived from the HFB calculations along the constant Z and constant N
chains and the variations of the different kinds of nuclear radii are also
analysed. Those radii are shown to follow isospin-dependent three parameter
laws close to the phenomenological formulas which reproduce experimental data.


title: Kinetic equation for strongly interacting dense Fermi systems

abstract:
  We review the non-relativistic Green's-function approach to the kinetic
equations for Fermi liquids far from equilibrium. The emphasis is on the
consistent treatment of the off-shell motion between collisions and on the
non-instant and non-local picture of binary collisions. The resulting kinetic
equation is of the Boltzmann type, and it represents an interpolation between
the theory of transport in metals and the theory of moderately dense gases. The
free motion of particles is renormalised by various mean field and mass
corrections in the spirit of Landau's quasiparticles in metals. The collisions
are non-local in the spirit of Enskog's theory of non-ideal gases. The
collisions are moreover non-instant, a feature which is absent in the theory of
gases, but which is shown to be important for dense Fermi systems. In spite of
its formal complexity, the presented theory has a simple implementation within
the Monte-Carlo simulation schemes. Applications in nuclear physics are given
for heavy-ion reactions and the results are compared with the former theory and
recent experimental data. The effect of the off-shell motion and the non-local
and non-instant collisions on the dynamics of the system can be characterised
in terms of thermodynamic functions such as the energy density or the pressure
tensor. Non-equilibrium counterparts of these functions and the corresponding
balance equations are derived and discussed from two points of view. Firstly,
they are used to prove the conservation laws. Secondly, the role of individual
microscopic mechanisms in fluxes of particles and momenta and in
transformations of the energy is clarified.

categories: nucl-th cond-mat.str-el physics.plasm-ph quant-ph


title: Microscopic Models for the Particle-Vibration Coupling in Exotic Nuclei

abstract:
  Recent results obtained, often in fruitful collaboration with Japanese
colleagues in the study of the interplay between single-particle and collective
degrees of freedom are reviewed.


title:
Covariant model for proton-proton bremsstrahlung: Comparison with
  high-precision data

abstract:
  We compare a relativistic covariant model for proton-proton bremsstrahlung
with high-quality data from KVI. The agreement in large parts of phase space is
satisfactory. However, remarkably large discrepancies are observed for specific
kinematic regions. These failures are shown to occur primarily when the final
two-nucleon system has energies less than about 15 MeV.


title: Kinetic Equation for Gluons in the Background Gauge of QCD

abstract:
  We derive the quantum kinetic equation for a pure gluon plasma, applying the
background field and closed-time-path method. The derivation is more general
and transparent than earlier works. A term in the equation is found which, as
in the classical case, corresponds to the color charge precession for partons
moving in the gauge field.


title: Ground state angular momenta of random nuclei

abstract:
  We investigate the phenomenom of emerging regular spectral features from
random interactions. In particular, we address the dominance of L=0 ground
states in the context of the vibron model and the interacting boson model. A
mean-field analysis links different regions of the parameter space with
definite geometric shapes. The results that are, partly, obtained in closed
analytic form, provide a clear and transparent interpretation of the
distribution of ground state angular momenta as observed before in numerical
studies.


title:
Renormalization Group Equation for Low Momentum Effective Nuclear
  Interactions

abstract:
  We consider two nonperturbative methods originally used to derive shell model
effective interactions in nuclei. These methods have been applied to the two
nucleon sector to obtain an energy independent effective interaction V_{low k},
which preserves the low momentum half-on-shell T matrix and the deuteron pole,
with a sharp cutoff imposed on all intermediate state momenta. We show that
V_{low k} scales with the cutoff precisely as one expects from renormalization
group arguments. This result is a step towards reformulating traditional model
space many-body calculations in the language of effective field theories and
the renormalization group. The numerical scaling properties of V_{low k} are
observed to be in excellent agreement with our exact renormalization group
equation.


title: Nuclear Self-energy and Realistic Interactions

abstract:
  The structure of nucleon self-energy in nuclear matter is evaluated for
various realistic models of the nucleon-nucleon (NN) interaction. Starting from
the Brueckner-Hartree-Fock approximation without the usual angle-average
approximation, the effects of hole-hole contributions and a self-consistent
treatment within the framework of the Green function approach are investigated.
Special attention is paid to the predictions for the spectral function
originating from various models of the NN interaction which all yield an
accurate fit for the NN phase shifts.


title: Time dependence of critical behavior in multifragmentation

abstract:
  We study signatures of critical behavior in microscopic simulations of small,
highly excited Lennard-Jones drops. We focus our attention on the behavior of
the system at the time of fragment formation (which takes place in phase space)
and compare the results with the corresponding ones obtained at asymptotic
times (experimentally accessible). The four critical exponents ($\tau$,$\beta$,
$\sigma$ and $\gamma$) found at fragmentation time have shown to be stable
against time evolution, indicating that the asymptotic stage reflects
accurately the physics at fragmentation time. Even though evidence of critical
behavior arises from the calculations, we can not affirm that the system is
performing a second order like phase transition.


title: Irreducible pionic effects in nucleon-deuteron scattering below 20 MeV

abstract:
  The consequences of a recently introduced irreducible pionic effect in low
energy nucleon-deuteron scattering are analyzed. Differential cross-sections,
nucleon (vector) and deuteron (vector and tensor) analyzing powers, and four
different polarization transfer coefficients have been considered. This
3NF-like effect is generated by the pion-exchange diagram in presence of a
two-nucleon correlation and is partially cancelled by meson-retardation
contributions. Indications are provided that such type of effects are capable
to selectively increase the vector (nucleon and deuteron) analyzing powers,
while in the considered energy range they are almost negligible on the
differential cross sections. These indications, observed with different
realistic nucleon-nucleon interactions, provide additional evidences that such
3NF-like effects have indeed the potential to solve the puzzle of the vector
analyzing powers. Smaller but non negligible effects are observed for the other
spin observables. In some cases, we find that the modifications introduced by
such pionic effects on these spin observables (other than the vector analyzing
powers) are significant and interesting and could be observed by experiments.


title: The Static Baryon Potential

abstract:
  Using state of the art lattice techniques we investigate the static baryon
potential. We employ the multi-hit procedure for the time links and a
variational approach to determine the ground state with sufficient accuracy
that, for distances up to $\sim 1.2$ fm, we can distinguish the $Y$- and
$\Delta$- Ans\"atze for the baryonic Wilson area law. Our analysis shows that
the $\Delta$-Ansatz is favoured. This result is also supported by the
gauge-invariant nucleon wave function which we measure for the first time.


title: Deuteron Compton Scattering in Chiral Perturbation Theory

abstract:
  Compton scattering on the deuteron is studied in the framework of baryon
chiral perturbation theory to third order in small momenta, for photon energies
of order the pion mass. The scattering amplitude is a sum of one- and
two-nucleon mechanisms with no undetermined parameters. Our results are in good
agreement with the intermediate energy experimental data, and a comparison is
made with the recent higher-energy data obtained at SAL.


title:
Dispersive spherical optical model of neutron scattering from Al27 up to
  250 MeV

abstract:
  A spherical optical model potential (OMP) containing a dispersive term is
used to fit the available experimental database of angular distribution and
total cross section data for n + Al27 covering the energy range 0.1- 250 MeV
using relativistic kinematics and a relativistic extension of the Schroedinger
equation. A dispersive OMP with parameters that show a smooth energy dependence
and energy independent geometry are determined from fits to the entire data
set. A very good overall agreement between experimental data and predictions is
achieved up to 150 MeV. Inclusion of nonlocality effects in the absorptive
volume potential allows to achieve an excellent agreement up to 250 MeV.


title: GRS computation of deep inelastic electron scattering on 4He

abstract:
  We compute cross sections for inclusive scattering of high energy electrons
on 4He, based on the two lowest orders of the Gersch-Rodriguez-Smith (GRS)
series. The required one- and two-particle density matrices are obtained from
non-relativistic 4He wave functions using realistic models for the
nucleon-nucleon and three-nucleon interaction. Predictions for E=3.6 GeV agree
well with the NE3 SLAC-Virginia data.


title: Reconstruction of Hadronization Stage in Pb+Pb Collisions at 158A GeV/c

abstract:
  Recent data on hadron multiplicities in central Pb+Pb collisions at 158A
GeV/c at mid-rapidity are analyzed within the concept of chemical freeze-out. A
non-uniformity of the baryon chemical potential along the beam axis is taken
into account. An approximate analytical solution of the hydrodynamic equations
for a chemically frozen Boltzmann-like gas is found. The Cauchy conditions for
hydrodynamic evolution of the hadron resonance gas are fixed at the thermal
freeze-out hypersurface from analysis of one-particle momentum spectra and HBT
correlations. The proper time of chemical freeze-out and physical conditions at
the hadronization stage, such as energy density and averaged transverse
velocity, are found.


title:
Effect of continuum couplings in fusion of halo $^{11}$Be on $^{208}$Pb
  around the Coulomb barrier

abstract:
  The effect of continuum couplings in the fusion of the halo nucleus $^{11}$Be
on $^{208}$Pb around the Coulomb barrier is studied using a three-body model
within a coupled discretised continuum channels (CDCC) formalism. We
investigate in particular the role of continuum-continuum couplings. These are
found to hinder total, complete and incomplete fusion processes. Couplings to
the projectile $1p_{1/2}$ bound excited state redistribute the complete and
incomplete fusion cross sections, but the total fusion cross section remains
nearly constant. Results show that continuum-continuum couplings enhance the
irreversibility of breakup and reduce the flux that penetrates the Coulomb
barrier. Converged total fusion cross sections agree with the experimental ones
for energies around the Coulomb barrier, but underestimate those for energies
well above the Coulomb barrier.


title: Photon emission in heavy ion collisions at the CERN SPS

abstract:
  We compute the thermal photon spectrum in the Pb+Pb collisions at the CERN
SPS energy using thermal emission rates and a hydrodynamic description for the
evolution of produced hot matter and compare our results with the measurements
of the excess photons by the WA98 collaboration. Our results show that the
measured photon spectrum can be reproduced with realistic initial conditions
which take properly into account also the finite longitudinal size of the
initial collision zone and which simultaneously describe well both the
transverse and longitudinal hadron spectra. In the scenario with initial
formation of QGP the recently calculated emission rate, complete to order
alpha_s, reproduces the measured spectrum. However, the experimental spectrum
can also be reproduced in a purely hadronic scenario without transition to QGP
state, but a high initial temperature, much over the values predicted for the
phase transition temperature T_c, is required.


title: Multipole Expansion for Relativistic Coulomb Excitation

abstract:
  We derive a general expression for the multipole expansion of the
electro-magnetic interaction in relativistic heavy-ion collisions, which can be
employed in higher-order dynamical calculations of Coulomb excitation. The
interaction has diagonal as well as off-diagonal multipole components,
associated with the intrinsic and relative coordinates of projectile and
target. A simple truncation in the off-diagonal components gives excellent
results in first-order perturbation theory for distant collisions and for beam
energies up to 200 MeV/nucleon.


title:
Breakup of $^{9}$Be on $^{209}$Bi above and near the Coulomb barrier as
  a molecular single-particle effect: its influence on complete fusion and
  scattering

abstract:
  The breakup of the $^{9}$Be projectile on the $^{209}$Bi target at bombarding
energies above and near the Coulomb barrier is studied in the adiabatic
two-center shell model approach. The effect of $^{9}$Be$% \to $n$+2\alpha $
breakup channel on complete fusion, elastic and inelastic cross sections is
investigated. Results show that the breakup of the projectile $^{9}$Be could be
due to a molecular single-particle effect shortly before the colliding nuclei
reach the Coulomb barrier.


title:
Spin polarized neutron matte and magnetic susceptibility within the
  Brueckner-Hartree-Fock approximation

abstract:
  The Brueckner--Hartree--Fock formalism is applied to study spin polarized
neutron matter properties. Results of the total energy per particle as a
function of the spin polarization and density are presented for two modern
realistic nucleon-nucleon interactions, Nijmegen II and Reid93. We find that
the dependence of the energy on the spin polarization is practically parabolic
in the full range of polarizations. The magnetic susceptibility of the system
is computed. Our results show no indication of a ferromagnetic transition which
becomes even more difficult as the density increases.


title: Modern Shell-Model Calculations

abstract:
  We have performed shell-model calculations starting from the CD-Bonn free
nucleon-nucleon NN potential and making use of a new approach for the
calculation of the effective interaction. This consists in deriving from the NN
potential a low-momentum effective potential V-low-k, defined within a given
cut-off momentum Lambda. Being a smooth potential it can be used directly in
nuclear structure calculations. To assess the practical value of this approach,
we have also performed calculations within the framework of the usual Brueckner
G-matrix formalism. Comparison of the calculated results between them and with
the experimental data shows that the V-low-k approach represents an
advantageous alternative to the use of the G-matrix.


title: From quark-gluon plasma to hadron spectra

abstract:
  Results on initial transverse energy production based on NLO perturbative QCD
calculation with final state saturation of produced minijets are used to fix
the initial energy density of produced matter. Assuming rapid thermalization,
this provides the initial conditions for a hydrodynamic description of the
expansion of final matter. Given a prescription of the the decoupling of
particles from the thermal system to free particles, final transverse spectra
of hadrons and integrated quantities like multiplicity and transverse energy
can be calculated in the central rapidity region. Results are reported and
compared with measurements.


title:
Faddeev treatment of long-range correlations and the one-hole spectral
  function of O16

abstract:
  The Faddeev technique is employed to study the influence of both
particle-particle and particle-hole phonons on the one-hole spectral function
of O16.
  Collective excitations are accounted for at a random phase approximation
level and subsequently summed to all orders by the Faddeev equations to obtain
the nucleon self-energy. An iterative procedure is applied to investigate the
effects of the self-consistent inclusion of the fragmentation in the
determination of the phonons and the corresponding self-energy. The present
results indicate that the characteristics of hole fragmentation are related to
the low-lying states of O16.


title: Parametrising yields of nuclear multifragmentation

abstract:
  We consider a model where, for a finite disintegrating system, yields of
composites can be calculated to arbitrary accuracy. An analytic answer for
yields is also known in the thermodynamic limit. In the range of temperature
and density considered in this work, the model has a phase transition. This
phase transition is first order. The analytic expression for yields of
composites, in the thermodynamic limit, does not conform to the expression
$<n_a>=a^{-\tau}f(a^{\sigma} (T-T_c))$ where, the usual identification would be
that $T_c$ is the critical temperature and $\tau,\sigma$ are critical
exponents. Nonetheless, for finite systems, we try to fit the yields with the
above expression. A minimisation procedure is adopted to get the parameters
$T_c,\tau$ and $\sigma$. While deviations from the formula are not negligible,
one might believe that the deviations are consistent with the corrections
attributable to finite particle number effects and might then conclude that one
has deduced at least approximately the values of critical parameters. This
exercise thus points to difficulties of trying to extract critical parameters
from data on nuclear disintegration. An interesting result is that the value of
$T_c$ deduced from the ``best'' fit is very close to the temperature at which
the first order phase transition occurs in the model. The yields calculated in
this model can also be fitted quite well by a parametrisation derived from a
droplet model.


title: Improved Nearside-Farside Decomposition of Elastic Scattering Amplitudes

abstract:
  A simple technique is described, that provides improved nearside-farside (NF)
decompositions of elastic scattering amplitudes. The technique, involving the
resummation of a Legendre partial wave series, reduces the importance of
unphysical contributions to NF subamplitudes, which can arise in more
conventional NF decompositions. Applications are made to a strong absorption
model and to a $^{16}$O + $^{12}$C optical potential at $E_{\text{lab}} = 132$
MeV.


title:
Simultaneous Optical Model Analyses of Elastic Scattering, Breakup, and
  Fusion Cross Section Data for the $^{6}$He + $^{209}$Bi System at
  Near-Coulomb-Barrier Energies

abstract:
  Based on an approach recently proposed by us, simultaneous
$\chi^{2}$-analyses are performed for elastic scattering, direct reaction (DR)
and fusion cross sections data for the $^{6}$He+$^{209}$Bi system at
near-Coulomb-barrier energies to determine the parameters of the polarization
potential consisting of DR and fusion parts. We show that the data are well
reproduced by the resultant potential, which also satisfies the proper
dispersion relation. A discussion is given of the nature of the threshold
anomaly seen in the potential.


title: Recent progress in pion photo- and electroproduction analysis

abstract:
  Pion photo- and electroproduction has been studied at threshold and in the
resonance region below W=2GeV. At threshold pi^0 production can be very well
explained within a dynamical model derived from an effective chiral Lagrangian.
The final state interaction is nearly saturated by single charge exchange
rescattering. In the resonance region new electroproduction data at Q^2=1GeV^2
has been analyzed with MAID and longitudinal and transverse photon helicity
amplitudes have been determined for different resonances. A detailed study of
the E/M and S/M ratios of the N->Delta transition shows a zero crossing of REM
near Q^2=4GeV^2, whereas the RSM becomes increasingly negative at large Q^2.


title:
Study of system- size effects in multi- fragmentation using Quantum
  Molecular Dynamics model

abstract:
  We report, for the first time, the dependence of the multiplicity of
different fragments on the system size employing a quantum molecular dynamics
model. This dependence is extracted from the simulations of symmetric
collisions of Ca+Ca, Ni+Ni, Nb+Nb, Xe+Xe, Er+Er, Au+Au and U+U at incident
energies between 50 A MeV and 1 A GeV. We find that the multiplicity of
different fragments scales with the size of the system which can be
parameterized by a simple power law.


title:
Selected aspects of the classical molecular dynamics of N bodies in
  strong interaction

abstract:
  Selected results of a classical simulation of N bodies in strong interaction
are presented. The static properties of such classical systems are
qualitatively similar to the known properties of atomic nuclei. The simulations
of collisions show that all observed reaction mechanisms in nucleus-nucleus
collisions are present in this numerical simulation. The first studies of such
collisions are in qualitative agreement with experimental observations. This
simulation could shed a new light on energy deposit in heavy ion collisions:
the excitation energy of each cluster is found lower than the energy of the
less bound body in the cluster. Finally, the similarities of fragmentation
pattern with those obtained with a statistical code indicate that an
unambiguous link can be established between the statistical and the dynamical
descriptions of reaction mechanisms.


title: Isospin effects in Nuclear Fragmentation

abstract:
  We investigate properties of the symmetry term in the equation-of-state (EOS)
of nuclear matter (NM) from the analysis of simulations of fragmentation events
in intermediate energy heavy ion collisions.
  For charge asymmetric systems a qualitative new feature in the liquid-gas
phase transition is predicted: the onset of chemical instabilities with a
mixture of isoscalar and isovector components. This leads to a separation into
a higher density (``liquid'') symmetric and a low density (``gas'')
neutron-rich phase, the so-called neutron distillation effect. We analyse the
simulations with respect to the time evolution of the isospin dynamics, as well
as with respect to the distribution and asymmetry of the final primary
fragments. Qualitatively different effects arise in central collisions, with
bulk fragmentation, and peripheral collisions with neck-fragmentation. The neck
fragments produced in this type of process appear systematically more
neutron-rich from a dynamical nucleon migration effect which is very sensitive
to the symmetry term in regions just below normal density. In general the
isospin dynamics plays an important role in all the steps of the reaction, from
prompt nucleon emission to the sequential decay of the primary fragments. A
fully microscopic description of the reaction dynamics including stochastic
elements to treat fluctuations realistically is absolutely necessary in order
to extract precise information on the fragmentation and the nuclear equation of
state. We have performed simulations for fragment production events in $n$-rich
($^{124}Sn$) and $n$-poor ($^{112}Sn$) symmetric colliding systems.


title: Relativistic mean-field study of light nuclei near drip line

abstract:
  The relativistic mean field theory is applied to study some exotic properties
of neutron rich nuclei as recently observed, namely, extension of the drip-line
for $F$ nuclei from $^{29}F$ to $^{31}F$ and the appearence of a new shell
closure at neutron number N=16. We find $^{31}F$ to be bound against
one-neutron dripping but unbound only marginally for two neutron separation.
The calculated functional dependence of one-neutron separation energy with
neutron number for different values of $T_Z = (N-Z)/2$ signals a new shell
closure at N=16 for neutron rich nuclei with $T_Z\ge 3$. This is further
corroborated from the study of the deformation and the gap across the Fermi
surface in these light nuclei.


title: Reliable calculations of level densities using statistical spectroscopy

abstract:
  Nucleosynthesis calculations require nuclear level densities for hundreds or
even thousands of nuclides. Ideally one would like to constrain these level
densities by microscopically motivated yet computationally cheap models. A
statistical approach suggests that low moments of the Hamiltonian might be
sufficient. Recently Zuker proposed a simple combinatoric formula for level
densities based upon the binomial distribution. We rigorously test the binomial
formula against full scale shell-model diagonalization calculations for
selected $sd$- and $pf$-shell nuclides and also against Monte Carlo path
integration calculations. We find that the fourth moment is as important as the
third moment to a good description of the level density, as well as
partitioning of the model space into subspaces.


title:
Statistical spectroscopic calculation of expectation values and
  spin-cutoff factors

abstract:
  Recently we proposed a formalism, based in nuclear statistical spectroscopy,
for efficient computation of nuclear level density, or densities of states,
through a sum of partitioned binomial functions (SUPARB). In this Letter we
extend the formalism to the calculation of locally averaged expectation values,
with specific application to spin-cutoff factors and the angular momentum
dependence of the nuclear density of states.


title:
Effects on the hadron propagators due to $k_\mu k_\nu $ terms in the
  vector meson propagator

abstract:
  In an approximation where the baryon current conservation is violated, the
contribution of the $k_\mu k_\nu $ terms in the vector meson propagator may not
vanish. Their effects on the baryon and meson spectral functions and on the
consequences of self-consistency are studied in the relativistic
self-consistent Hartree-Fock approximation by means of the $\sigma -\omega $
model. Two cases where the $k_\mu k_\nu $ terms are and are not neglected are
compared. It is found that there is a marked change in the baryon spectral
function which becomes more peaked in the latter case. Such a change remains
even by a proper readjustment of parameters. The effects of self-consistency in
the $\sigma -\omega $ model are qualitatively the same in both cases, though
quantitatively there is some significant difference.


title: Gauge invariance of the color-superconducting gap on the mass shell

abstract:
  The gap parameter for color superconductivity is expected to be a gauge
invariant quantity, at least on the appropriate mass shell. Computing the gap
to subleading order in the QCD coupling constant, g, we show that the prefactor
of the exponential in 1/g is gauge dependent off the mass shell, and
independent of gauge on the mass shell.


title:
On the nucleon-nucleon interaction leading to a standing wave
  instability in symmetric nuclear matter

abstract:
  We examine a recently proposed nucleon-nucleon interaction, claimed by its
authors both realistic and leading to a standing wave instability in symmetric
nuclear matter. Contrary to these claims, we find that this interaction leads
to a serious overbinding of 4He, 16O and 40Ca nuclei when the Hartree-Fock
method is properly applied. The resulting nuclear densities contradict the
experimental data and all realistic Hartree-Fock results.


title: On Cooper Pairing in Finite Fermi Systems

abstract:
  In order to analyse the role of the quasiparticle-phonon interaction in the
origin of nuclear gap, we applied an approach which is similar to the
Eliashberg theory for usual superconductors. We obtained that the averaged
contribution of the quasiparticle-phonon mechanism to the observed value of the
pairing gap for $^{120}$Sn is 26% and the BCS-type mechanism gives 74% . Thus,
pairing is of a mixed nature at least in semi-magic nuclei -- it is due to the
quasiparticle-phonon and BCS mechanisms, the first one being mainly a surface
mechanism and the second one mainly a volume mechanism. The calculations of the
strength distribution for the odd-mass nuclei $^{119}Sn$ and $^{121}Sn$ have
shown that the quasiparticle-phonon mechanism mainly improves the description
of the observed spectroscopic factors in these nuclei.
  For the case of nuclei with pairing in both proton and neutron systems it is
necessary to go beyond the Eliashberg-Migdal approximations and include the
vertex correction graphs in addition to the rainbow ones. The estimations for
spectroscopic factors performed within a three-level model have shown that the
contribution of the vertex correction graphs was rather noticeable.


title: Hypercentral constituent quark model and isospin dependence

abstract:
  The constituent quark model based on a hypercentral approach takes into
account three-body force effects and standard two-body potential contributions.
The quark potential contains a hypercentral interaction, to which a hyperfine
term is added. While the hypercentral potential supplies good values for the
centroid energies of the resonance multiplets and a realistic set of quark wave
functions, the hyperfine splittings are sometimes not sufficient to account for
the observed masses.
  In this work we have introduced an improved form of the hyperfine interaction
and an isospin dependent quark potential. The resulting description of the
baryon spectrum is very good, also for the Roper resonance, specially thanks to
the flavour dependent interaction.


title: Critical Tsallis exponent in heavy ion reaction

abstract:
  The numerical solution of the nonlocal kinetic equation allows to simulate
heavy ion reactions around Fermi energy. The expansion velocity and density
profile show specific radial dependence which can be described with a Tsallis
exponent of $q=5/3$. This might be considered as an indication of a phase
transition.


title:
The Shears Mechanism in 142Gd in the Skyrme-Hartree-Fock Method with the
  Tilted-Axis Cranking

abstract:
  We report on the first Skyrme-Hartree-Fock calculations with the tilted-axis
cranking in the context of magnetic rotation. The mean field symmetries,
differences between phenomenological and self-consistent methods and the
generation of shears-like structures in the mean field are discussed.
Significant role of the time-odd spin-spin effective interaction is pointed
out. We reproduce the shears mechanism, but quantitative agreement with
experiment is rather poor. It may have to do with too large core polarization,
lack of pairing correlations or properties of the Skyrme force.


title: Two-potential approach to multi-dimensional tunneling

abstract:
  We consider tunneling to the continuum in a multi-dimensional potential. It
is demonstrate that this problem can be treated as two separate problems: a) a
bound state and b) a non-resonance scattering problem, by a proper splitting of
the potential into two components. Finally we obtain the resonance energy and
the partial tunneling widths in terms of the bound and the scattering state
wave functions. This result can be used in a variety of tunneling problems. As
an application we consider the ionization of atomic states by an external
field. We obtain very simple analytical expressions for the tunneling width and
for the angular distribution of tunneling electrons. It is shown that the
angular spread of electrons in the final state is determined by the
semi-classical traversal tunneling time.

categories: nucl-th cond-mat hep-ph nlin.CD physics.atom-ph quant-ph


title: Relativistic calculation of nuclear transparency in (e,e'p) reactions

abstract:
  Nuclear transparency in (e,e'p) reactions is evaluated in a fully
relativistic distorted wave impulse approximation model. The relativistic mean
field theory is used for the bound state and the Pauli reduction for the
scattering state, which is calculated from a relativistic optical potential.
Results for selected nuclei are displayed in a Q^2 range between 0.3 and 1.8
(GeV/c)^2 and compared with recent electron scattering data. For Q^2 = 0.3
(GeV/c)^2 the results are lower than data; for higher Q^2 they are in
reasonable agreement with data. The sensitivity of the model to different
prescriptions for the one-body current operator is investigated. The off-shell
ambiguities are rather large for the distorted cross sections and small for the
plane wave cross sections.


title:
Enhanced excitation of Giant Pairing Vibrations in heavy-ion reactions
  induced by weakly-bound projectiles

abstract:
  The use of radioactive ion beams is shown to offer the possibility to study
collective pairing states at high excitation energy, which are not usually
accessible with stable projectiles because of large energy mismatch. In the
case of two-neutron stripping reactions induced by 6He, we predict a population
of the Giant Pairing Vibration in 208Pb or 116Sn with cross sections of the
order of a millibarn, dominating over the mismatched transition to the ground
state.


title:
On contribution of three-body forces to $Nd$ interaction at intermediate
  energies

abstract:
  Available data on large-angle nucleon-deuteron elastic scattering $Nd\to dN$
below the pion threshold give a signal for three-body forces. There is a
problem of separation of possible subtle aspects of these forces from off-shell
effects in two-nucleon potentials.
  By considering the main mechanisms of the process, we show qualitatively that
in the quasi-binary reaction $N+d\to (NN)+N$ with the final spin singlet
NN-pair in the S-state the relative contribution of the 3N forces differs
substantially from the elastic channel.
  It gives a new testing ground for the problem in question.


title:
Nucleon-Nucleon Correlations in Electromagnetically Induced Knockout
  Reactions

abstract:
  The attempts to investigate correlations in electromagnetically induced one-
and two-nucleon knockout are reviewed. The theoretical framework for cross
section calculations is outlined and some results are presented for the
exclusive $^{16}$O($e,e'p)^{15}$N and $^{16}$O($e,e'pp)^{14}$C reactions. For
the ($e,e'p$) reaction attention is focussed on extracting the spectroscopic
factors. For the ($e,e'pp$) reaction the possibility of obtaining direct and
clear information on short-range correlations is discussed.


title:
A Possibility to Observe Short-Range NN Properties in the Deuteron
  Breakup $pd\to ppn$

abstract:
  Quasi-binary reaction of the deuteron breakup $p+d\to (pp)+n$ with the final
proton-proton pair $(pp)$ in the
  $^1S_0$ state is analyzed at initial energies $0.5 - 2$ GeV in the kinematics
of backward elastic pd-scattering $pd\to dp$. On the basis of the main
mechanisms of the $pd\to dp$ process, including initial and final state
interaction, we show that unpolarized cross section and spin observables of
this reaction exhibit important properties of the half-off-shell
$pp(^1S_0)$-scattering amplitude, which are relevant to the nucleon-nucleon
interaction at short distances.


title: Lattice Study of the High Density State of SU(2)-QCD

abstract:
  We investigate high density state of SU(2) QCD by using Lattice QCD
simulation with Wilson fermions. The ratio of fermion determinants is evaluated
at each step of the Metropol is link update by Woodbury formula. At
$\beta=0.7$, and $\kappa = 0.150$, we calculate the baryon number density, the
Polyakov lines, and the energy density of gluon sector with chemical potential
$\mu$=0 to 0.8 on the $4^{3} \times 12$ lattice. Behavior of the meson
propagators and diquark propagators with finite chemical potential are also
investigated.


title: Synthesis of Superheavy elements and Theory of Atomic Nucleus

abstract:
  The connection of synthesis of long-lived superheavy nuclei and existence of
the island of stability with the choice of realistic nuclear potential is
discussed: the behaviour of the average field of nuclei is an important element
of nuclear models. It is also shown that it is just Dubna that possesses the
priority both in the recent synthesis of a superheavy nucleus with charge Z=114
and in its theoretical prediction made 35 years ago. Possible sizes of the
island of stability of superheavy nuclei are considered.


title: Description of inclusive scattering of 4.045 GeV electrons from D

abstract:
  We exploit a relationship between the Structure Functions of nucleons, the
physical deuteron and of a deuteron, composed of point-nucleons to compute
angular distributions of inclusive cross sections of 4.05 GeV electrons. We
report general agreement with data and interpret the remaining discrepancies.
We discuss the potential of the data for information on neutron structure
functions $F_k^n(x,Q^2)$ and the static form factor $G_M^n(Q^2)$.


title: Self-consistent quantum effects in the quark meson coupling model

abstract:
  We derive the equation of state of nuclear matter including vacuum
polarization effects arising from the nucleons and the sigma mesons in the
quark-meson coupling model which incorporates explicitly quark degrees of
freedom with quark coupled to the scalar and vector mesons. This leads to a
softer equation of state for nuclear matter giving a lower value of
incompressibility than would be reached without quantum effects. The {\it
in-medium} nucleon and sigma meson masses are also calculated in a
self-consistent manner.


title:
Eta-N Final State Interaction in incoherent Photoproduction of
  Eta-mesons from the Deuteron near Threshold

abstract:
  An analysis of incoherent photoproduction of $\eta$ mesons off the deuteron
for photon energies from threshold to 800 MeV is presented. The dominant
contribution, the $\gamma$N-$\eta$N amplitude, is described within an isobar
model. Effects of the final state interactions in the $NN$ as well as the
${\eta}N$ systems are included employing models derived within the
meson-exchange approach. It is found that their consideration is important.
Specifically, due to an interference effect the influence of the $\eta N$ final
state interaction is enhanced in the reaction $\gamma d \to np \eta$ close to
threshold.


title: Medium modification of the nucleon axial form factor

abstract:
  We study the modification of the nucleon axial form factor in nuclear matter.
The internal quark substructure of the nucleon is self-consistently described
by the quark meson coupling model. We find that the axial form factor of the
bound nucleon is quenched considerably from that of the free nucleon. The axial
vector coupling constant is reduced by roughly 10% at normal nuclear matter
density and the axial form factor varies within 8% for moderate momentum
transfer.


title: Neutron stars and the fermionic Casimir effect

abstract:
  The inner crust of neutron stars consists of nuclei of various shapes
immersed in a neutron gas and stabilized by the Coulomb interaction in the form
of a crystal lattice. The scattering of neutrons on nuclear inhomegeneities
leads to the quantum correction to the total energy of the system. This
correction resembles the Casimir energy and turns out to have a large influence
on the structure of the crust.


title: Properties of nuclei in the neutron star crust

abstract:
  In the present study we investigate the static properties of nuclei in the
inner crust of neutron stars. Using the Hartree-Fock method in coordinate
space, together with the semiclassical approximation, we examine the patterns
of phase transitions.


title: Can weakly bound heavy nuclei with very large neutron excess exist?

abstract:
  A realistic model is suggested based on the quasiparticle Lagrange version of
the self-consistent Finite Fermi Systems theory supplemented with the
microscopically calculated surface parameters of the Landau-Migdal interaction
amplitude. The latter are expressed in terms of the off-shell T-matrix of free
NN-scattering and show a strong dependence on the chemical potential of a
nucleus under consideration in the drip line vicinity. This effect could result
in shifting the neutron drip line position to very large values of the neutron
excess.


title:
Two-fermion bound states in the explicitly covariant Light-Front
  Dynamics

abstract:
  We develop a general method to construct two relativistic fermions bound
states with a given $J^{\pi}$, in the framework of the explicitly covariant
light-front dynamics.


title: Nuclear Equation of State

abstract:
  Nuclear equation of state plays an important role in the evolution of the
Universe, in supernova explosions and, thus, in the production of heavy
elements, and in stability of neutron stars. The equation constrains the two-
and three-nucleon interactions and the quantum chromodynamics in
nonperturbative regime. Despite the importance of the equation, though, its
features had remained fairly obscure. The talk reviews new results on the
equation of state from measurements of giant nuclear oscillations and from
studies of particle emission in central collisions of heavy nuclei.


title: Measuring charge fluctuations in high-energy nuclear collisions

abstract:
  Various measures of charge fluctuations in heavy-ion collisions are
discussed. Advantages of the Phi-measure are demonstrated and its relation to
other fluctuation measures is established. To get the relation, Phi is
expressed through the moments of multiplicity distribution. We study how the
measures act in the case of a `background' model which represents the classical
hadron gas in equilibrium. The model assumes statistical particle production
constrained by charge conservation. It also takes into account both the effect
of incomplete experimental apparatus acceptance and that of tracking
inefficiency. The model is shown to approximately agree with the PHENIX and
preliminary STAR data on the electric charge fluctuations. Finally,
`background-free' measures are discussed.


title: Theoretical Study of the ^3He(mu^-,nu_mu)^3H Capture

abstract:
  The ^3He(mu^-,nu_mu)^3H weak capture is studied using
correlated-hyperspherical-harmonics wave functions, obtained from realistic
Hamiltonians consisting of the Argonne $v_{14}$ or Argonne $v_{18}$
two-nucleon, and Tucson-Melbourne or Urbana-IX three-nucleon interactions. The
nuclear weak charge and current operators have vector and axial-vector
components that include one- and two-body contributions. The strength of the
leading two-body operator in the axial-vector current is adjusted to reproduce
the Gamow-Teller matrix element in tritium $\beta$-decay. The calculated total
capture rate is in excellent agreement with the most recent experimental
determination $1496\pm 4$ sec$^{-1}$, when the PCAC value is adopted for the
induced pseudo-scalar coupling constant $g_{PS}$. The predictions for the
capture rate and angular correlation parameters $A_v$, $A_t$, and $A_\Delta$
are found to be only very weakly dependent on the model input Hamiltonian. The
variation of these observables with $g_{PS}$ and the theoretical uncertainties
deriving from the model-dependent procedure used to constrain the axial current
are investigated.