title: On a Theory of Superfluidity of Asymmetric Nuclear Matter

abstract:
  Influence of asymmetry on superfluidity of nuclear matter with
triplet-singlet pairing of nucleons (in spin and isospin spaces) is considered
within the framework of a Fermi-liquid theory. Solutions of self-consistent
equations for the critical temperature and the energy gap at T=0 are obtained.
It is shown, that the backward influence of pairing correlations through the
normal distribution functions of nucleons leads to the qualitative change:
instead of two-valued behavior the energy gap has universal one-valued
behavior. At T=0 superfluidity arises as a result of a first order phase
transition in density.


title:
The decay $\rho^{0}\to \pi^{+}+\pi^{-}+\gamma$ and the coupling constant
  g$_{\rho\sigma\gamma}$

abstract:
  The experimental branching ratio for the radiative decay
$\rho^{0}\to\pi^{+}+\pi^{-}+\gamma$ is used to estimate the coupling constant
$g_{\rho\sigma\gamma}$ for a set of values of $\sigma$-meson parameters
M$_{\sigma}$ and $\Gamma_{\sigma}$. Our results are quite different than the
values of this constant used in the literature.


title:
Discussing the possibility of observation of parity violation in heavy
  ion collisions

abstract:
  It was recently argued that in heavy ion collision the parity could be
broken. This Note addresses the question of possibility of the experimental
detection of the effect. We discuss how parity violating effects would modify
the final particle distributions and how one could construct variables
sensitive to the effect, and which measurement would be the (most) conclusive.
Discussing different observables we also discuss the question if the
``signals'' can be faked by ``conventional'' effects (such as anisotropic flow,
etc.) and make estimates of the signals.


title: Effective Field Theory for Dilute Fermi Systems

abstract:
  The virtues of an effective field theory (EFT) approach to many-body problems
are illustrated by deriving the expansion for the energy of an homogeneous,
interacting Fermi gas at low density and zero temperature. A renormalization
scheme based on dimensional regularization with minimal subtraction leads to a
more transparent power-counting procedure and diagrammatic expansion than
conventional many-body approaches. Coefficients of terms in the expansion with
logarithms of the Fermi momentum are determined by the renormalization
properties of the EFT that describes few-body scattering. Lessons for an EFT
treatment of nuclear matter are discussed.


title:
Baryonic contributions to the dilepton spectra in relativistic heavy ion
  collisions

abstract:
  We investigate the baryonic contributions to the dilepton yield in high
energy heavy ion collisions within the context of a transport model. The
relative contribution of the baryonic and mesonic sources are examined. It is
observed that most dominant among the baryonic channels is the decay of
N*(1520) and mostly confined in the region below the rho peak. In a transport
theory implementation we find the baryonic contribution to the lepton pair
yield to be small.


title:
Practical approximation scheme for the pion dynamics in the
  three-nucleon system

abstract:
  We discuss a working approximation scheme to a recently developed formulation
of the coupled piNNN-NNN problem. The approximation scheme is based on the
physical assumption that, at low energies, the 2N-subsystem dynamics in the
elastic channel is conveniently described by the usual 2N-potential approach,
while the explicit pion dynamics describes small, correction-type effects.
Using the standard separable-expansion method, we obtain a dynamical equation
of the Alt-Grassberger-Sandhas (AGS) type. This is an important result, because
the computational techniques used for solving the normal AGS equation can also
be used to describe the pion dynamics in the 3N system once the matrix
dimension is increased by one component. We have also shown that this
approximation scheme treats the conventional 3N problem once the pion degrees
of freedom are projected out. Then the 3N system is described with an extended
AGS-type equation where the spin-off of the pion dynamics (beyond the 2N
potential) is taken into account in additional contributions to the driving
term. These new terms are shown to reproduce the diagrams leading to modern
3N-force models. We also recover two sets of irreducible diagrams that are
commonly neglected in 3N-force discussions, and conclude that these sets should
be further investigated, because a claimed cancellation is questionable.


title: Why is the three-nucleon force so odd?

abstract:
  By considering a class of diagrams which has been overlooked also in the most
recent literature on three-body forces, we extract a new contribution to the
three-nucleon interaction which specifically acts on the triplet odd states of
the two nucleon subsystem. In the static approximation, this 3N-force
contribution is fixed by the underlying 2N interaction, so in principle there
are no free parameters to adjust. The 2N amplitude however enters in the 3NF
diagram in a form which cannot be directly accessed or constrained by NN
phase-shift analysis. We conclude that this new 3N-force contribution provides
a mechanism which implies that the presence of the third nucleon modifies the
p-wave (and possibly the f-wave) components of the 2N subsystem in the
triplet-isotriplet channels.


title:
Photoproduction of electron-positron pairs on the proton in the
  resonance region

abstract:
  Production of lepton pairs in gamma p -> e-e+ p reaction is studied at photon
energies up to 1 GeV. We show that even if lepton charge is not measured there
are extensive kinematical regimes where the nuclear process dominates over the
Bethe-Heitler contribution. The decomposition is performed of the unpolarized
cross section for the virtual Compton scattering in terms of response
functions. These are expressed in terms of a polarization density matrix of the
virtual photon and are shown to be sensitive to the properties of baryon
resonances in the first and the second resonance regions. In the analysis a
unitary K-matrix model is used, based on an effective Lagrangian including
nucleon, mesons, and baryon resonances with masses up to 1.7 GeV. Results of
the model are compared with data for real-photon Compton scattering and
predictions are given for observables in photoproduction of lepton pairs.


title:
The p(d,p)d and p(d,p)pn reactions as a tool for the study of the short
  range internal structure of the deuteron

abstract:
  In recent time the deuteron structure at short distances is often treated
from the point of view nonnucleonic degrees of freedom. In this paper the
measurements of T-odd polarization observables using tensor polarized deuteron
beam and polarized proton target or proton polarimeter are proposed to search
the quark configurations inside the deuteron.


title:
Finite formation time effects in quasi-elastic $(e,e')$ scattering on
  nuclear targets

abstract:
  The problem of the final state interaction in quasi-elastic $(e,e')$
scattering at large $Q^2$, is investigated by exploiting the idea that the
ejected nucleon needs a finite amount of time to assume its asymptotic form. It
is shown that when the dependence of the scattering amplitude of the ejected
nucleon on its virtuality is taken into account, the final state interaction is
decreased. The developed approach is simpler to implement than the one based on
the color transparency description of the damping of the final state
interaction, and is essentially equivalent to the latter in the case of the
single rescattering term. The $(e,e')$ process on the deuteron is numerically
investigated and it is shown that, at $x=1$, appreciable finite formation time
effects at $Q^2$ of the order of 10 (GeV/c)$^2$ are expected.


title: Pairing Interaction in N=Z Nuclei with Half-filled High-j Shell

abstract:
  The role of L=0 pairing interactions (both T=0 and T=1) in three selected
bands with the total isospin T=0 in 22Na, 48Cr and 90Rh nuclei is discussed in
the spherical shell model. These bands were selected requiring termination in a
most unfavourable way. The investigated effects coming from pairing
interactions include the change of nuclear wavefunction, quadrupole properties
and state energy. To follow the gradual change of nuclear properties, the
investigation is performed in a perturbative approach by defining the
Hamiltonian with a variable content of the pairing interaction. It is shown
that the pairing does not affect the quadrupole properties, if the energy
distance to other close lying states is large. The calculated pairing energy is
shown to have a similar spin dependence in these three bands. In addition, the
influence of the model space as well as of the residual interaction on the
derived pairing energy is discussed.


title:
Foundations of self-consistent particle-rotor models and of
  self-consistent cranking models

abstract:
  The Kerman-Klein formulation of the equations of motion for a nuclear shell
model and its associated variational principle are reviewed briefly. It is then
applied to the derivation of the self-consistent particle-rotor model and of
the self-consistent cranking model, for both axially symmetric and triaxial
nuclei. Two derivations of the particle-rotor model are given. One of these is
of a form that lends itself to an expansion of the result in powers of the
ratio of single-particle angular momentum to collective angular momentum, that
is essentual to reach the cranking limit. The derivation also requires a
distinct, angular-momentum violating, step. The structure of the result implies
the possibility of tilted-axis cranking for the axial case and full
three-dimensional cranking for the triaxial one. The final equations remain
number conserving. In an appendix, the Kerman-Klein method is developed in more
detail, and the outlines of several algorithms for obtaining solutions of the
associated non-linear formalism are suggested.


title: Neutrino Oscillations and the Solar Neutrino Problem

abstract:
  I describe the current status of the solar neutrino problem, summarizing the
arguments that its resolution will require new particle physics. The phenomenon
of matter-enhanced neutrino oscillations is reviewed. I consider the
implications of current experiments -- including the SuperKamiokande
atmospheric and LSND measurements -- and the need for additional constraints
from SNO and other new detectors.


title: Hybrid Baryon Signatures

abstract:
  We discuss whether a low-lying hybrid baryon should be defined as a three
quark - gluon bound state or as three quarks moving on an excited adiabatic
potential. We show that the latter definition becomes exact, not only for very
heavy quarks, but also for specific dynamics. We review the literature on the
signatures of hybrid baryons, with specific reference to strong hadronic
decays, electromagnetic couplings, diffractive production and production in psi
decay.


title:
Competition Between Induced Symmetry Breaking, Cooper Pairing and Chiral
  Condensate at Finite Density

abstract:
  We study the competition between induced symmetry breaking (ISB),
  Cooper pairing (superconductivity) and chiral condensation at finite
non-asymptotic density. Using a quantum mechanical model studied recently by
Ilieva and Thirring, we analyze the expectation value of the fermion number
density $\la a^*a\ra$ in the presence of chemical potential and discuss
relevance of the ISB phenomenon in the model. By Bogoliubov transformation, we
obtain the ground state energy and find that a phase with both superconducting
and mean field gap is a true ground state. We also study the effective
potentials of a two-dimensional field theory model for competitions between
$\la\bar\psi\psi\ra$, $\la\psi\psi\ra$ and $\la\psi^\dagger\psi\ra$. We find
that in the regime $\mu <\mu_c$, where $\mu_c$ is found to be around $0.4 m_F$
with $m_F$ being the renormalizaton point of chiral condensate, we have a
chiral symmetry-breaking phase with almost zero fermion number density and in
the case of $\mu >\mu_c$ the system sits in the mixed phase characterized by
  $\la \psi^\dagger\psi\ra\neq 0$ and $\la \psi\psi\ra\neq 0$ as long as the
renormalization point, $M_0$, corresponding to a superconducting gap is not
zero, $M_0\neq 0$.


title: Electromagnetic production of vector mesons at low energies

abstract:
  We have investigated exclusive photoproduction of light vector mesons
($\omega$, $\rho$ and $\phi$) on the nucleon at low energies. In order to
explore the questions concerning the so-called missing nucleon resonances, we
first establish the predictions from a model based on the Pomeron and meson
exchange mechanisms. We have also explored the contributions due to the
mechanisms involving $s$- and $u$-channel intermediate nucleon state. Some
discrepancies found at the energies near threshold and large scattering angles
suggest a possibility of using this reaction to identify the nucleon
resonances.


title:
Nuclear Muon Capture on the Proton and 3He within the Standard Model and
  Beyond

abstract:
  Nuclear muon capture on the proton and $^3$He is considered both within and
beyond the Standard Model in terms as general as is possible. Explicit and
precise analytic expressions for all possible observables are given, assuming
only a Dirac neutrino in the limit of vanishing mass. These results allow both
for precision tests of the Standard Model and new physics, as well as for the
assessment of the potential physics reach of experiments designed to measure
specific observables. Using these expressions, stringent constraints can
already be inferred from a recent precision measurement of the statistical
capture rate on $^3$He. Likewise, similar constraints should follow the
completion of a precision measurement in progress of the singlet capture rate
on the proton.


title: Nucleon-Nucleon Scattering in a Three Dimensional Approach

abstract:
  The nucleon-nucleon (NN) t-matrix is calculated directly as function of two
vector momenta for different realistic NN potentials. To facilitate this a
formalism is developed for solving the two-nucleon Lippmann-Schwinger equation
in momentum space without employing a partial wave decomposition. The total
spin is treated in a helicity representation. Two different realistic NN
interactions, one defined in momentum space and one in coordinate space, are
presented in a form suited for this formulation. The angular and momentum
dependence of the full amplitude is studied and displayed. A partial wave
decomposition of the full amplitude it carried out to compare the presented
results with the well known phase shifts provided by those interactions.


title: Properties of $^{12}$C in the {\it ab initio} nuclear shell-model

abstract:
  We obtain properties of $^{12}$C in the {\it ab initio} no-core nuclear
shell-model. The effective Hamiltonians are derived microscopically from the
realistic CD-Bonn and the Argonne V8' nucleon-nucleon (NN) potentials as a
function of the finite harmonic oscillator basis space. Binding energies,
excitation spectra and electromagnetic properties are presented for model
spaces up to $5\hbar\Omega$. The favorable comparison with available data is a
consequence of the underlying NN interaction rather than a phenomenological
fit.


title: Role of deformation in the nonmesonic decay of light hypernuclei

abstract:
  We discuss the nonmesonic decay of deformed p-shell hypernuclei. The Nilsson
model with angular momentum projection is employed in order to take into
account the deformation effects. The nonmesonic decay rate and the intrinsic
$\Lambda$ asymmetry parameter decrease as a function of the deformation
parameter, while the ratio of the neutron- to proton-induced decay rates
increases. We find that the deformation effects change these observables by
about 10 % for $^9_{\Lambda}$Be from the spherical limit.


title:
Probing the effectiveness: chiral perturbation theory calculations of
  low-energy reactions on the deuteron

abstract:
  I provide a brief, and therefore necessarily biased, review of the
application of effective field theory to electromagnetic processes on the
deuteron. Electron-deuteron scattering is discussed for virtual photon momenta
up to 700 MeV, and photon-deuteron scattering is examined for incident photon
energies of order the pion mass.


title: Van der Waals Excluded Volume Model for Lorentz Contracted Rigid Spheres

abstract:
  Conventional cluster and virial expansions are generalized to momentum
dependent inter-particle potentials. The model with Lorentz contracted hard
core potentials is considered, e.g. as hadron gas model. A Van der Waals-type
model with a temperature dependent excluded volume is derived. Lorentz
contraction effects at given temperature are stronger for light particles and
make their effective excluded volume smaller than that of heavy ones.


title:
Application of realistic effective interactions to the structure of the
  Zr isotopes

abstract:
  We calculate the low-lying spectra of the zirconium isotopes Z=40 with
neutron numbers from N=52 to N=60 using the 1p1/20g9/2 proton and
2s1d0g7/20h11/2 neutron sub-shells to define the model space. Effective
proton-proton, neutron--neutron and proton-neutron interactions have been
derived using 88Sr as closed core and employing perturbative many-body
techniques. The starting point is the nucleon-nucleon potential derived from
modern meson exchange models. The comprehensive shell-model calculation
performed in this work provides a qualitative reproduction of essential
properties such as the sub-shell closures in 96Zr and 98Zr.


title:
Goldberger-Treiman Relation and g_piNN from the Three Quark BS/Faddeev
  Approach in the NJL Model

abstract:
  A systematic evaluation method of matrix elements of quantum one-body
operators between nucleon states in the three-quark
Bethe-Salpeter(3qBS)/Faddeev approach in the NJL model is reviewed. We do not
confine ourselves to a particular truncation scheme of the 3qBS kernel. One of
our main aims is to derive a general condition to be imposed on a given BS
kernel in order that the PCAC relation is satisfied correctly. We apply this
condition to some particular 3qBS kernels. We numerically calculate g_piNN in
the 3qBS/Faddeev approach to estimate the violation of the
Goldberger-Treiman/PCAC relation due to the UV-regularization scheme. We
finally consider the non-vanishing current quark mass effects on the
Goldberger-Treiman relation.


title: Searching for the Next Yukawa Phase of QCD

abstract:
  QCD predicts that the interactions between quarks and gluons change from a
confining to a screened Yukawa form above a critical temperature $T_c\sim 150$
MeV. In this talk, I review some of the key observables in heavy ion reactions
which are being used to search for this new partonic Yukawa phase at SPS and
RHIC. These include collective observables such as $dE_\perp/dyd^2p_\perp$,
meson interferometry, jet quenching, and $J/\psi$ suppression.


title:
Pertinent Dirac structure for QCD sum rules of meson-baryon coupling
  constants

abstract:
  Using general baryon interpolating fields $J_B$ for $B= N, \Xi, \Sigma, $
without derivative, we study QCD sum rules for meson-baryon couplings and their
dependence on Dirac structures for the two-point correlation function with a
meson $i\int d^4x e^{iqx} \bra 0|{\rm T}[J_B(x)\bar{J}_B(0)] |{\cal M}(p)\ket$.
Three distinct Dirac structures are compared: $i\gamma_5$,
$i\gamma_5\fslash{p}$, and $\gamma_5\sigma_{\mu\nu}q^\mu p^\nu$ structures.
  From the dependence of the OPE on general baryon interpolating fields, we
propose criteria for choosing an appropriate Dirac structure for the coupling
sum rules. The $\gamma_5\sigma_{\mu\nu}q^\mu p^\nu$ sum rules satisfy the
criteria while the $i\gamma_5$ sum rules beyond the chiral limit do not. For
the $i\gamma_5\fslash{p}$ sum rules, the large continuum contributions prohibit
reliable prediction for the couplings. Thus, the $\gamma_5\sigma_{\mu\nu}q^\mu
p^\nu$ structure seems pertinent for realistic predictions. In the SU(3) limit,
we identify the OPE terms responsible for the $F/D$ ratio. We then study the
dependence of the ratio on the baryon interpolating fields. We conclude the
ratio $F/D \sim 0.6-0.8$ for appropriate choice of the interpolating fields.


title:
Jets and produced particles in pp collisions from SPS to RHIC energies
  for nuclear applications

abstract:
  Higher-order pQCD corrections play an important role in the reproduction of
data at high transverse momenta in the energy range 20 GeV $ \leq \sqrt{s} \leq
200$ GeV. Recent calculations of photon and pion production in $pp$ collisions
yield detailed information on the next-to-leading order contributions. However,
the application of these results in proton-nucleus and nucleus-nucleus
collisions is not straightforward. The study of nuclear effects requires a
simplified understanding of the output of these computations. Here we summarize
our analysis of recent calculations, aimed at handling the NLO results by
introducing process and energy-dependent $K$ factors.


title:
The Half-Life and the Nuclear Matrix Element of the $2\nu\beta\beta$
  Decay in $^{76}Ge$

abstract:
  We apply the shell-model wave-functions of $^{76}Ge$ to calculate the nuclear
matrix elements and the half-life of the $2\nu\beta\beta$ decay in $^{76}Ge$.
Our result is comparable to the recent observed $2\nu\beta\beta$-decay
half-life of $^{76}Ge$. Furthemore it provides the upper limit of the effective
neutrino mass is about 0.4 eV from the recent experimental data of the
$0\nu\beta\beta$-decay half-life.


title: The Sigma Commutator from Lattice QCD

abstract:
  As a direct source of information on chiral symmetry breaking within QCD, the
sigma commutator is of considerable importance. Since hadron structure is a
non-perturbative problem, numerical calculations on a space-time lattice are
currently the only rigorous approach. With recent advances in the calculation
of hadron masses within full QCD, it is of interest to see whether the sigma
commutator can be calculated directly from the dependence of the nucleon mass
on the input quark mass. We show that, provided the correct chiral behaviour of
QCD is respected in the extrapolation to realistic quark masses, one can indeed
obtain a fairly reliable determination of the sigma commutator using present
lattice data. For two-flavour dynamical fermion QCD the sigma commutator lies
between 45 and 55 MeV based on recent data from CP-PACS and UKQCD.


title:
Azimuthal asymmetry in transverse energy flow in nuclear collisions at
  high energies

abstract:
  The azimuthal pattern of transverse energy flow in nuclear collisions at RHIC
and LHC energies is considered. We show that the probability distribution of
the event-by-event azimuthal disbalance in transverse energy flow is
essentially sensitive to the presence of the semihard minijet component.


title: Pion Cloud and Nucleon Mass in Finite Nuclei

abstract:
  We study the mass of a nucleon in a nucleus using a model recently introduced
for a nucleon current with a pion cloud component. The method of QCD sum rules
is used to determine the mass shifts for nucleons to first order in nuclear
density in oxygen-16 and calcium-40, with the pion propagator determined by an
optical potential for pion-nucleus scattering. Mass shifts due to the pionic
contributions range from negligible in oxygen to -100 MeV in calcium at central
nuclear density, with larger shifts in the nuclear surface. The consistency of
this model with chiral perturbation theory is demonstrated.


title: Electromagnetic moments of relativistic higher spin baryons

abstract:
  We point out a source of ambiguities in the measurements of the
electromagnetic moments of spin-3/2 baryons which rely on relativistic
Lagrangian models. An anambiguous relation between the parameters of the
spin-3/2 electromagnetic Lagrangian and the electromagnetic moments of the
spin-3/2 particle exits in general only for on-shell situation, while the
measurements are done on ``virtual'' baryons.


title: A Dynamical Model for the Resonant Multipoles and the $\Delta$ Structure

abstract:
  We show that recent experiment data for the ratios $E_{1^+}/M_{1^+}$ and
$S_{1^+}/M_{1^+}$ can be explained in a dynamical model for electromagnetic
production of pions, together with a simple scaling assumption for the bare
$\gamma^* N \Delta$ form factors. Within our model we find that the bare
$\Delta$ is almost spherical and the electric E2 and Coulomb C2 quadrupole
excitations of the physical $\Delta$ are nearly saturated by pion cloud
contribution in $Q^2 \le 4.0 GeV^2$.


title:
First order optical potentials and 25 to 40 MeV proton elastic
  scattering

abstract:
  The differential cross sections and analyzing powers from the elastic
scattering of 25 and 40 MeV protons from many nuclei have been studied.
Analyses have been made using a fully microscopic model of proton-nucleus
scattering seeking to establish a means appropriate for use in analyses of
radioactive beam scattering from hydrogen with ion energies 25A and 40A MeV.


title:
One-body density matrix and momentum distribution in s-p and s-d shell
  nuclei

abstract:
  Analytical expressions of the one- and two- body terms in the cluster
expansion of the one-body density matrix and momentum distribution of the s-p
and s-d shell nuclei with N=Z are derived. They depend on the harmonic
oscillator parameter b and the parameter $\beta$ which originates from the
Jastrow correlation function. These parameters have been determined by least
squares fit to the experimental charge form factors. The inclusion of
short-range correlations increases the high momentum component of the momentum
distribution, $n({\bf k})$ for all nuclei we have considered while there is an
A dependence of $n({\bf k})$ both at small values of k and the high momentum
component. The A dependence of the high momentum component of $n({\bf k})$
becomes quite small when the nuclei $^{24}$Mg, $^{28}$Si and $^{32}$S are
treated as 1d-2s shell nuclei having the occupation probability of the 2s-state
as an extra free parameter in the fit to the form factors.


title:
Non-extensive statistics effects in quark-gluon plasma and in
  relativistic heavy-ion collisions

abstract:
  The presence of memory effects and color long-range forces among the
many-parton system in the early stage of heavy-ion collisions can affect the
particle statistical behavior at the freeze-out temperature. In this context,
we calculate, in the framework of the equilibrium generalized non-extensive
thermostatistics, the shape of pion transverse mass spectrum and the value of
the transverse momentum correlation function of the pions emitted during the
central Pb+Pb collisions and we show that the experimental results is well
reproduced assuming very small deviations from the standard statistics.


title: Screened Coulomb potentials for astrophysical nuclear fusion reactions

abstract:
  The electron-screening acceleration of laboratory fusion reactions at
astrophysical energies is an unsolved problem of great importance to
astrophysics. That effect is modeled here by considering the fusion of
hydrogen-like atoms whose electron probability density is used in Poisson's
equation in order to derive the corresponding screened Coulomb potential
energy. That way atomic excitations and deformations of the fusing atoms can be
taken into account. Those potentials are then treated semiclassically in order
to obtain the screening (accelerating) factor of the reaction. By means of the
proposed model the effect of a superstrong magnetic field on laboratory
Hydrogen fusion reactions is investigated here for the first time showing that,
despite the considerable increase in the cross section of the $% dd$ reaction,
the $pp$ reaction is still too slow to justify experimentation. The proposed
model is finally applied on the $H^{2}(d,p) H^{3}$ fusion reaction describing
satisfactorily the experimental data although some ambiguity remains regarding
the molecular nature of the deuteron target. Notably, the present method gives
a sufficiently high screening energy for Hydrogen fusion reactions so that the
take-away energy of the spectator nucleus can also be taken into account.


title: Isospin Dependence of Nucleon-Nucleon Elastic Cross Section

abstract:
  The in-medium neutron-proton, proton-proton(neutron-neutron) scattering cross
sections($\sigma_{np}^{*}$, $\sigma_{pp(nn)}^{*}$) are studied based on QHD-II
type Lagrangian within the framework of the microscopic transport theory. The
results demonstrate that, for free nucleon-nucleon scattering cross sections,
the isospin dependence is dominantly caused by $\rho$ meson field. The medium
correction of nucleon-nucleon scattering cross sections is also isospin
dependent, $\sigma_{np}^{*}$ depends on the baryon density weakly and
$\sigma_{pp(nn)}^{*}$ depends on the baryon density significantly, which is due
to the different effects of the medium correction of nucleon mass and $\rho$
meson mass on $\sigma_{np}$ and $\sigma_{pp(nn)}$, respectively


title: Quadrupole shape invariants in the interacting boson model

abstract:
  In terms of the Interacting Boson Model, shape invariants for the ground
state, formed by quadrupole moments up to sixth order, are studied in the
dynamical symmetry limits and, for the first time, over the whole structural
range of the IBM-1. The results are related to the effective deformation
parameters and their fluctuations in the geometrical model. New signatures that
can distinguish vibrator and gamma-soft rotor structures, and one that is
related to shape coexistence, are identified.


title:
Geometric chaoticity leads to ordered spectra for randomly interacting
  fermions

abstract:
  A rotationally invariant random interaction ensemble was realized in a
single-j fermion model. The dominance of ground states with zero and maximum
spin was confirmed and explained with a statistical approach based on the
random coupling of individual angular momenta. The interpretation is supported
by the structure of the ground state wave functions.


title: The $\pi$, $K^+$, and $K^0$ electromagnetic form factors

abstract:
  The rainbow truncation of the quark Dyson-Schwinger equation is combined with
the ladder Bethe-Salpeter equation for the meson amplitudes and the dressed
quark-photon vertex in a self-consistent Poincar\'e-invariant study of the pion
and kaon electromagnetic form factors in impulse approximation. We demonstrate
explicitly that the current is conserved in this approach and that the obtained
results are independent of the momentum partitioning in the Bethe-Salpeter
amplitudes. With model gluon parameters previously fixed by the condensate, the
pion mass and decay constant, and the kaon mass, the charge radii and spacelike
form factors are found to be in good agreement with the experimental data.


title:
Pion photo- and electroproduction and the partially-conserved axial
  current

abstract:
  The relevance of the axial current for pion production processes off the
nucleon with real or virtual photons is revisited. Employing the hypothesis of
a partially conserved axial current (PCAC), it is shown that, when all of the
relevant contributions are taken into account, PCAC does not provide any
additional constraint for threshold production processes that goes beyond the
Goldberger-Treiman relation. In particular, it is shown that pion
electroproduction processes at threshold cannot be used to extract any
information regarding the weak axial form factor. The relationships found in
previous investigations are seen to be an accident of the approximations
usually made in this context.


title: Pion Production Model - Connection between Dynamics and Quark Models

abstract:
  We discuss the difficulties in testing the hadron models by using the N^*
parameters extracted from the empirical amplitude analyses of the pi-N and
gamma-N reaction data. As an alternative or perhaps a more advantageous
approach, we present a Hamiltonian formulation that can relate the pion
production dynamics and the constituent quark models of N^* structure. The
application of the approach in investigating the Delta and N^*(S_{11})
excitations is reviewed. It is found that while the Delta excitation can be
described satisfactory, the pi-N scattering in S_{11} channel can not be
described by the constituent quark models based on either the
one-gluon-exchange or one-meson-exchange mechanisms. A phenomenological
quark-quark potential has been constructed to reproduce the S_{11} amplitude.


title: Rotational Structure of T=0 and T=1 bands in the N=Z Nucleus 62Ga

abstract:
  The rotational behaviour of T=0 and T=1 bands in the odd-odd N=Z nucleus 62Ga
is studied theoretically using the spherical shell model (laboratory frame) and
the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good
description of available experimental data. The role of isoscalar and isovector
pairing in the T=0 and T=1 bands as functions of angular momentum is studied in
the shell model. The observed backbending in the T=0 band is interpreted as an
unpaired band-crossing between two configurations with different deformation.
The two configurations differ by 2p-2h and are found to terminate the
rotational properties at I\pi=9+ and I\pi=17+, respectively. E2-decay matrix
elements and spectroscopic quadrupole moments are calculated. From the CNS
calculation, supported by shell model results, it is suggested that the low
spin parts of the bands with T=0 and T=1 correspond to triaxially deformed
states with the rotation taking place around the shortest axis (positive
\gamma) and intermediate axis (negative \gamma), respectively. At lower spins
the configuration space pf_{5/2}g_{9/2}, used in the shell model calculation,
is found sufficient while also f_{7/2} becomes important above the backbending.


title: Band Crossing and Signature Splitting in Odd Mass fp Shell Nuclei

abstract:
  Structure of two sets of mirror nuclei: 47V - 47Cr and 49Cr - 49Mn, as well
as 49V and 51Mn, is studied using the projected shell model. Their yrast
spectra are described as an interplay between the angular momentum projected
states around the Fermi level which carry different intrinsic K-quantum
numbers. The deviations from a regular rotational sequence are attributed to
band crossing and signature splitting, which are usually discussed in heavy
nuclear systems. Our results agree reasonably with experimental data, and are
comparable with those from the full $pf$ shell model calculations.


title: Double Beta Decay: Theory, Experiment, and Implications

abstract:
  The theory, experimental status, and implications of double beta decay are
reviewed.


title:
Generator coordinate method calculations of one-nucleon removal
  reactions on $^{40}$Ca

abstract:
  An approach to the Generator Coordinate Method (GCM) using Skyrme-type
effective forces and Woods-Saxon construction potential is applied to calculate
the single-particle proton and neutron overlap functions in $^{40}$Ca. The
relationship between the bound-state overlap functions and the one-body density
matrix has been used. These overlap functions are applied to calculate the
cross sections of one-nucleon removal reactions such as ($e,e'p$), ($\gamma,p$)
and ($p,d$) on $^{40}$Ca on the same theoretical footing. A consistent
description of data for the different reactions is achieved. The shapes of the
experimental cross sections for transitions to the $3/2^{+}$ ground state and
the first $1/2^{+}$ excited state of the residual nuclei are well reproduced by
the overlap functions obtained within the GCM. An additional spectroscopic
factor accounting for correlations not included in the overlap function must be
applied to the calculated results to reproduce the size of the experimental
cross sections.


title:
Effects of the Neutron Spin-Orbit Density on Nuclear Charge Density in
  Relativistic Models

abstract:
  The neutron spin-orbit density contributes to the nuclear charge density as a
relativistic effect. The contribution is enhanced by the effective mass
stemming from the Lorentz-scalar potential in relativistic models. This
enhancement explains well the difference between the cross sections of elastic
electron scattering off $^{40}$Ca and $^{48}$Ca which was not reproduced in
non-relativistic models. The spin-orbit density will be examined in more detail
in electron scattering off unstable nuclei which would be available in the
future.


title: The Dynamical Dipole Mode in Dissipative Heavy Ion Collisions

abstract:
  We study the effect of a direct Giant Dipole Resonance ($GDR$) excitation in
intermediate dinuclear systems with exotic shape and charge distributions
formed in charge asymmetric fusion entrance channels. A related enhancement of
the $GDR$ gamma yield in the evaporation cascade of the fused nucleus is
expected. The dynamical origin of such $GDR$ extra strength will show up in a
characteristic anisotropy of the dipole gamma-emission. A fully microscopic
analysis of the fusion dynamics is performed with quantitative predictions of
the $GDR$ photon yield based on a dynamics- statistics coupling model. In
particular we focus our attention on the energy and mass dependence of the
effect.
  We suggest a series of new experiments, in particular some optimal entrance
channel conditions. We stress the importance of using the new available
radioactive beams.


title: Mapping the proton drip line from Z=31 to Z=49

abstract:
  The structure of proton drip line nuclei in the 60 < A < 100 mass range is
studied with the Relativistic Hartree Bogoliubov (RHB) model. For the elements
which determine the astrophysical rapid proton capture process path, the RHB
model predicts the location of the proton drip-line, the ground-state
quadrupole deformations and one-proton separation energies at and beyond the
drip-line. The results of the present theoretical investigation are compared
with available experimental data. For possible odd-Z ground state proton
emitters, the calculated deformed single-particle orbitals occupied by the odd
valence proton and the corresponding spectroscopic factors are compared with
predictions of the macroscopic-microscopic mass model.


title:
Description of Multi Quasi Particle Bands by the Tilted Axis Cranking
  Model

abstract:
  The selfconsistent cranking approach is extended to the case of rotation
about an axis which is tilted with respect to the principal axes of the
deformed potential (Tilted Axis Cranking). Expressions for the energies and the
intra bands electromagnetic transition probabilities are given.
  The mean field solutions are interpreted in terms of quantal rotational
states. The construction of the quasiparticle configurations and the
elimination of spurious states is discussed. The application of the theory to
high spin data is demonstrated by analyzing the multi quasiparticle bands in
the nuclide-s with $N=102,103$ and $Z=71,72,73$.


title: Cross sections for Coulomb and nuclear breakup of three-body halo nuclei

abstract:
  All possible dissociation cross sections for the loosely bound three-body
halo nuclei $^6$He (n+n+$\alpha$) and $^{11}$Li (n+n+$^{9}$Li) are computed as
functions of target and beam energy. Both Coulomb and nuclear interactions are
included in the same theoretical framework. The measurements agree with the
calculations for energies above 100 Mev/nucleon. The largest cross sections
correspond to final states with zero or three particles for heavy and with two
neutrons for light targets.


title:
On the effects of the final state interaction in the
  electro-disintegration of the deuteron at intermediate and high energies

abstract:
  The role of the final state interactions (FSI) in the inclusive quasi-elastic
disintegration of the deuteron is investigated treating the two-nucleon final
state within the exact continuum solutions of the non-relativistic Schroedinger
equation, as well as within the Glauber multiple scattering approach. It is
shown that for values of the Bjorken scaling variable $x_{Bj}\simeq 1$ both
approaches provide similar results, unless the case $x_{Bj}\gtrsim 1$, where
they appreciably disagree. It is demonstrated that present experimental data,
which are mostly limited to a region of four-momentum transfer ($Q^2 \lesssim 4
(GeV/c)^2$) where the Center-of-Mass energy of the final state is below the
pion threshold production, can be satisfactorily reproduced by the approach
based on the exact solution of the Schroedinger equation and not by the Glauber
approach. It is also pointed out that the latter, unlike the former, does not
satisfy the inelastic Coulomb sum rule, the violation being of the order of
about 20%.


title: Pairing gaps from nuclear mean-field models

abstract:
  We discuss the pairing gap, a measure for nuclear pairing correlations, in
chains of spherical, semi-magic nuclei in the framework of self-consistent
nuclear mean-field models. The equations for the conventional BCS model and the
approximate projection-before-variation Lipkin-Nogami method are formulated in
terms of local density functionals for the effective interaction. We calculate
the Lipkin-Nogami corrections of both the mean-field energy and the pairing
energy. Various definitions of the pairing gap are discussed as three-point,
four-point and five-point mass-difference formulae, averaged matrix elements of
the pairing potential, and single-quasiparticle energies. Experimental values
for the pairing gap are compared with calculations employing both a delta
pairing force and a density-dependent delta interaction in the BCS and
Lipkin-Nogami model. Odd-mass nuclei are calculated in the spherical blocking
approximation which neglects part of the the core polarization in the odd
nucleus. We find that the five-point mass difference formula gives a very
robust description of the odd-even staggering, other approximations for the gap
may differ from that up to 30% for certain nuclei.


title: Neutrino-pair emission in a strong magnetic field

abstract:
  We study the neutrino emissivity of strongly magnetized neutron stars due to
the charged and neutral current couplings of neutrinos to baryons in strong
magnetic fields. The leading order neutral current process is the one-body
neutrino-pair bremsstrahlung, which does not have an analogue in the zero field
limit. The leading order charged current reaction is the known generalization
of the direct Urca processes to strong magnetic fields. While for superstrong
magnetic fields in excess of $10^{18}$ G the direct Urca process dominates the
one-body bremsstrahlung, we find that for fields on the order $10^{16}-10^{17}$
G and temperatures a few times $10^9$ K the one-body bremsstrahlung is the
dominant process. Numerical computation of the resulting emissivity, based on a
simple parametrization of the equation of state of the $npe$-matter in a strong
magnetic field, shows that the emissivity of this reaction is of the same order
of magnitude as that of the modified Urca process in the zero field limit.


title: Nuclear isotope thermometry

abstract:
  We discuss different aspects which could influence temperatures deduced from
experimental isotopic yields in the multifragmentation process. It is shown
that fluctuations due to the finite size of the system and distortions due to
the decay of hot primary fragments conspire to blur the temperature
determination in multifragmentation reactions. These facts suggest that caloric
curves obtained through isotope thermometers, which were taken as evidence for
a first-order phase transition in nuclear matter, should be investigated very
carefully.


title: Formation of Few-Body Clusters in Nuclear Matter

abstract:
  Starting from a suitably modified three-body equation to include dominant
medium effects such as self energy corrections and Pauli blocking I present
results on several observables relevant for the formation of light clusters in
a heavy ion collision at moderate energies. Properly taking into account the
medium leads to the Mott effect, larger reaction rates, in turn, faster time
scales for the deuteron life time and chemical relaxation time. Within a
Boltzmann-Uehling-Uhlenbeck approach to simulate the heavy ion reactions, also
the total number of deuterons and the energy spectrum are significantly changed
due to medium effects in the elementary cross sections entering into the
collision integrals.


title: Non-Abelian Energy Loss at Finite Opacity

abstract:
  A systematic expansion in opacity, $L/\lambda$, is used to clarify the
non-linear behavior of induced gluon radiation in quark-gluon plasmas. The
inclusive differential gluon distribution is calculated up to second order in
opacity and compared to the zeroth order (factorization) limit. The opacity
expansion makes it possible to take finite kinematic constraints into account
that suppress jet quenching in nuclear collisions below RHIC ($\sqrt{s}=200$
AGeV) energies.


title: Probing the Structure of Nucleons in the Resonance Region

abstract:
  Status, open questions, and future prospects of the physics of excited
nucleons are discussed. Emphasis is on the study of the structure of nucleons
via measurements of their electromagnetic transition form factors, the search
for "missing" resonances, the spin structure of the nucleon in the resonance
region, and connections between the resonance and the deep-inelastic regimes.


title: Statistical Behavior of Finite-Size Partially Equilibrated Systems

abstract:
  We examine deviations from Boltzmann-Gibbs statistics for partially
equilibrated systems of finite size. We find that such systems are
characterized by the Levy distribution whose non-extensivity parameter is
related to the number of internally equilibrated subsystems and to correlations
among them. This concept is applied to Quark-Gluon Plasma formation.


title: A New Coupling Potential for the Scattering of Deformed Light Heavy-Ions

abstract:
  This letter introduces a new coupling potential to explain the experimental
data over wide energy ranges for a number of systems. Within the
coupled-channels formalism, this letter first shows the limitations of the
standard coupled-channels theory in the case where one of the nuclei in the
reaction is strongly deformed and then, demonstrates that a global solution to
the problems of light heavy-ion reactions such as $^{12}$C+$^{12}$C,
$^{16}$O+$^{28}$Si and $^{12}$C+$^{24}$Mg can be found using a new
second-derivative coupling potential in the coupled-channels formalism. This
new approach consistently improves the agreement with the experimental data for
the elastic and inelastic scattering data as well as for their excitation
functions using constant or slightly energy-dependent parameters.


title: Exactly Soluble Model for Nuclear Liquid-Gas Phase Transition

abstract:
  Thermodynamical properties of nuclear matter undergoing multifragmentation
are studied within a simplified version of the statistical model. An exact
analytical solution has been found for the grand canonical ensemble. Excluded
volume effects are taken into account in the thermodynamically self-consistent
way. In thermodynamic limit the model exhibits a first order liquid-gas phase
transition with specific mixed phase properties. An extension of the model
including the Fisher's term is also studied. The possibility of the second
order phase transition at or above the critical point is demonstrated. The
fragment mass distributions in the different regions of the phase diagram are
discussed.


title:
ISI/FSI in Threshold Meson Production - Onshell Approach and Coulomb
  Problem

abstract:
  The onshell description of Initial- and Final-State-Interactions (ISI and
FSI) of threshold meson production reactions is reviewed. Existing onshell
models and their offshell extension are discussed. Unitarity constraints on
enhancement factors are formulated. A strategy for the treatment of essential
singularities connected to Coulomb-like FSI is given.


title: Nucleon structure effect on the longitudinal response function

abstract:
  Using the quark-meson coupling model, we study the longitudinal response
function for quasielastic electron scattering from nuclear matter within
relativistic RPA. In QMC the coupling constant between the scalar meson and the
nucleon is expected to decrease with increasing nuclear density. Furthermore,
since the electromagnetic form factors of the in-medium nucleon are modified at
the same time, the longitudinal response function and the Coulomb sum are
reduced by a total of about 20% in comparison with the Hartree contribution.


title: Isospin Symmetry Breaking in Nuclei - ONS Anomaly

abstract:
  We study the binding energy differences of the valence proton and neutron of
the mirror nuclei, $^{15}$O - $^{15}$N, $^{17}$F - $^{17}$O, $^{39}$Ca -
$^{39}$K and $^{41}$Sc - $^{41}$Ca, using the quark-meson coupling model. The
calculation involves nuclear structure and shell effects explicitly. It is
shown that binding energy differences of a few hundred keV arise from the
strong interaction, even after subtracting all electromagnetic corrections. The
origin of these differences may be ascribed to the charge symmetry breaking
effects set in the strong interaction through the u and d current quark mass
difference. In this report, we first review the quark-meson coupling model. In
particular, we discuss about the nucleon mass in nuclear medium. Then, we
present details of the charge symmetry breaking in finite nuclei, especially
the Okamoto-Nolen-Schiffer anomaly.


title:
Rotational properties of $^{252, 253, 254}$No. Influence of pairing
  correlations

abstract:
  Rotational bands of $^{252, 253, 254}$No and the fission barriers of
$^{254}$No at spin 0$\hbar$ and 20$\hbar$ are calculated with the
Hartree-Fock-Bogolyubov theory and the Lipkin-Nogami approximate particle
number projection. The SLy4 Skyrme force is used in the particle-hole channel.
A zero-range force with and without density-dependence is used in the
particle-particle channel. The experimental ground state deformation
(${\cal{Q}}_{20}$ = 32.8 b) is reproduced as well as the increase of the
dynamical moment of inertia with frequency both for $^{252}$No and $^{254}$No.
  The rotational band of $^{253}$No is also calculated. Fission barriers of
$^{254}$No at spin 0$\hbar$ and 20$\hbar$ show the robustness of
shell-corrections against rotation in these heavy nuclei.


title: Charmonium absorption by nucleons

abstract:
  $J/\Psi$ dissociation in collisions with nucleons is studied within a boson
exchange model and the energy dependence of the dissociation cross section is
calculated from the threshold for $\Lambda_c{\bar D}$ production to high
energies. We illustrate the agreement of our results with calculations based on
short distance QCD and Regge theory. The compatibility between our calculations
and the data on $J/\Psi$ photoproduction on a nucleon is discussed. We evaluate
the elastic $J/\Psi{+}N$ cross section using a forward dispersion relation and
demonstrate the overall agreement with the predictions from QCD sum rules. Our
results are compatible with the phenomenological dissociation cross section
evaluated from the experimental data on $J/\Psi$ production from $\gamma{+}A$,
$p{+}A$ and $A{+}A$ collisions.


title: Anharmonic properties of double giant dipole resonance

abstract:
  A systematic microscopic study of the anharmonic properties of the double
giant dipole resonance (DGDR) has been carried out, for the first time, for
nuclei with mass number $A$ spanning the whole mass table. It is concluded that
the corrections of the energy centroid of the $J^{\pi} = 0^+$ and $2^+$
components of the DGDR from its harmonic limit are negative, have a value of
the order of few hundred keV and follow an $A^{-1}$ dependence.


title: Isovector and isoscalar superfluid phases in rotating nuclei

abstract:
  The subtle interplay between the two nuclear superfluids, isovector T=1 and
isoscalar T=0 phases, are investigated in an exactly soluble model. It is shown
that T=1 and T=0 pair-modes decouple in the exact calculations with the T=1
pair-energy being independent of the T=0 pair-strength and vice-versa. In the
rotating-field, the isoscalar correlations remain constant in contrast to the
well known quenching of isovector pairing. An increase of the isoscalar (J=1,
T=0) pair-field results in a delay of the bandcrossing frequency. This
behaviour is shown to be present only near the N=Z line and its experimental
confirmation would imply a strong signature for isoscalar pairing collectivity.
The solutions of the exact model are also discussed in the
Hartree-Fock-Bogoliubov approximation.


title:
Clocking hadronization in relativistic heavy ion collisions with balance
  functions

abstract:
  A novel state of matter has been hypothesized to exist during the early stage
of relativistic heavy ion collisions, with normal hadrons not appearing until
several fm/c after the start of the reaction. To test this hypothesis,
correlations between charges and their associated anticharges are evaluated
with the use of balance functions. It is shown that late-stage hadronization is
characterized by tightly correlated charge/anticharge pairs when measured as a
function of relative rapidity.


title:
Algebraic Model for scattering in three-s-cluster systems. I.
  Theoretical Background

abstract:
  A framework to calculate two-particle matrix elements for fully
antisymmetrized three-cluster configurations is presented. The theory is
developed for a scattering situation described in terms of the Algebraic Model.
This means that the nuclear many-particle state and its asymptotic behaviour
are expanded in terms of oscillator states of the intra-cluster coordinates.
The Generating Function technique is used to optimize the calculation of matrix
elements. In order to derive the dynamical equations, a multichannel version of
the Algebraic Model is presented.


title: Phi decay in nuclei

abstract:
  We have studied the decay of the \phi meson in nuclear matter by taking into
account the renormalization of the K and \bar{K} mesons in the medium. We
separate the contribution of the total width into different reaction channels,
K\bar{K} and KYh, the latter ones associated with the \phi N \to K^+ Y
reactions. We find a total width at normal nuclear matter density of about 22
MeV, considerably larger than the free one.


title:
Algebraic Model for scattering of three-s-cluster systems. II.
  Resonances in the three-cluster continuum of 6He and 6Be

abstract:
  The resonance states embedded in the three-cluster continuum of 6He and 6Be
are obtained in the Algebraic Version of the Resonating Group Method. The model
accounts for a correct treatment of the Pauli principle. It also provides the
correct three-cluster continuum boundary conditions by using a Hyperspherical
Harmonics basis. The model reproduces the observed resonances well and achieves
good agreement with other models. A better understanding for the process of
formation and decay of the resonance states in six-nucleon systems is obtained.


title:
Algebraic Model for Quantum Scattering. Reformulation, Analysis and
  Numerical Strategies

abstract:
  The convergence problem for scattering states is studied in detail within the
framework of the Algebraic Model, a representation of the Schrodinger equation
in an L^2 basis. The dynamical equations of this model are reformulated
featuring new "Dynamical Coefficients", which explicitly reveal the potential
effects. A general analysis of the Dynamical Coefficients leads to an optimal
basis yielding well converging, precise and stable results. A set of strategies
for solving the equations for non-optimal bases is formulated based on the
asymptotic behaviour of the Dynamical Coefficients. These strategies are shown
to provide a dramatically improved convergence of the solutions.


title: Nucleon Resonance Transition Couplings to Vector Mesons

abstract:
  Recent heavy ion experiments indicate modifications of the $\rho-$meson mass
in medium. In the CERES experiments $\rho-$mesons are produced at $\sim$ normal
nuclear matter density, where hadrons are more appropriate constituents than
quarks. A collective "nuclear $\rho$", in which every nucleon is excited to the
N(1520) state, with equal amplitude, enters in this description. At the higher
densities reached by future experiments constituent quarks become the
appropriate variables. Here the $\rho$ and $\omega$ transition couplings to the
nucleon resonances up to 1700 MeV, including the N(1520), are derived by means
of the chiral quark model. The relevant coupling constants are expressed in
terms of the corresponding vector coupling constants to nucleons. The quality
of the model relations is tested by a calculation of the corresponding
pion-resonance coupling constants, which are known from the empirical pion
decay widths.


title: Point-Form Analysis of Elastic Deuteron Form Factors

abstract:
  Point-form relativistic quantum mechanics is applied to elastic
electron-deuteron scattering. The deuteron is modeled using relativistic
interactions that are scattering-equivalent to the nonrelativistic Argonne
$v_{18}$ and Reid '93 interactions. A point-form spectator approximation (PFSA)
is introduced to define a conserved covariant current in terms of
single-nucleon form factors. The PFSA is shown to provide an accurate
description of data up to momentum transfers of 0.5 ${\rm GeV}^2$, but falls
below the data at higher momentum transfers. Results are sensitive to the
nucleon form factor parameterization chosen, particularly to the neutron
electric form factor.


title: New Solutions to Covariant Non-equilibrium Dynamics

abstract:
  New solutions of 3+1D covariant kinetic theory are presented for nuclear
collisions in the energy domain Ecm ~ 200 AGeV. They are obtained using MPC, a
new Monte-Carlo parton transport technique that employs very high parton
subdivision that is necessary to preserve covariance. The transport results are
compared with ideal hydrodynamics solutions. We show that the transport
evolution differs significantly from hydrodynamics. In addition, we compare the
transport freeze-out distributions to those obtained from ideal hydrodynamics
with the Cooper-Frye isotherm freeze-out prescription. The transport freeze-out
four-volume is shown to be sensitive to the reaction rates and deviates from
both time-like and space-like freeze-out 3D hypersurfaces commonly assumed. In
particular, we find that there does not exist a universal freeze-out
temperature. Finally, the transverse momentum distributions are found to
deviate by up to an order of magnitude from (Cooper-Frye frozen) hydrodynamics
for a wide range of possible initial conditions and reaction rates at RHIC
energies.


title: How to Renormalize the Gap Equation in High Density QCD

abstract:
  We discuss two technical issues related to the gap equation in high-density
QCD: i) how to obtain the asymptotic solution with well controlled
approximations, and ii) the renormalization of four-quark operators in the
high-density effective field theory.


title: Generalized Faddeev Equations for N-Particle Scattering

abstract:
  A proposal is made for reducing the solution of the N-particle
Lippmann-Schwinger equation to that of smaller sets of particles. This consists
of first writing the N-particle equation in terms of all possible
$N/2$-particle Lippmann-Schwinger equations. (If N is odd this needs a minor
modification.) The second step requires a decoupling of the resolvents for the
fewer particle systems so that each can be solved separately. This
generalization of the Faddeev approach deals only with connected kernels and
the homogeneous solution reproduces the N-particle Schr\"odinger equation. For
four particles the proposed method involves only a $3\times3$ matrix whereas
other approaches typically require the solution of at least a $7\times7$ matrix
equation.


title: Parity Nonconservation in the Deuteron Photodisintegration

abstract: The paper has been withdrawn.


title: Bosonization of the pairing Hamiltonian

abstract:
  The problem of the pairing interaction is dealt with even Grassmann variables
in the hamiltonian framework. Eigenfunctions of given energy, seniority and
zero third component of angular momentum are given in terms of single particle
and collective bosonic fields.


title:
Systematic analysis of \Delta I = 4 bifurcation in A~150 superdeformed
  nuclei: Active orbitals

abstract:
  A simple criterion for the \Delta I = 4 bifurcation is applied to thirty
superdeformed bands in the A~150 mass region. The analysis allows to
differentiate between active and inactive for staggering single-particle
states. The consideration is based on additivity of nonaxial hexadecapole
moment, which plays a key role in the phenomenon.


title: Bose-Einstein correlations in heavy-ion and electron-positron collisions

abstract:
  We shortly review recent successes in applying Bose-Einstein interferometry
in heavy ion collisions and the proceed to some model calculations for
3-dimensional Bose-Einstein correlation functions in electron-positron
collisions at the Z0 pole.


title: Relativistic eikonal approximation in high-energy A(e,e'p) reactions

abstract:
  A fully relativistic model for the description of exclusive (e,e'p) reactions
off nuclear targets at high energies and momentum transfers is outlined. It is
based on the eikonal approximation for the ejectile scattering wave function
and a relativistic mean-field approximation to the Walecka model. Results for
^{12}C(e,e'p) and ^{16}O(e,e'p) differential cross sections and separated
structure functions are presented for four-momenta in the range 0.8 \leq Q^{2}
\leq 20 (GeV/c)^{2}. The regions of applicability of the eikonal approximation
are studied and observed to be confined to proton knockout in a relatively
small cone about the momentum transfer. A simple criterium defining the
boundaries of this cone is determined. The Q^2 dependence of the effect of
off-shell ambiguities on the different (e,e'p) structure functions is
addressed. At sufficiently high values of Q^2 their impact on the cross
sections is illustrated to become practically negligible. It is pointed out
that for the whole range of Q^2 values studied here, the bulk of the
relativistic effects arising from the coupling between the lower components in
the wave functions, is manifesting itself in the longitudinal-transverse
interference term.


title: Many-body theory interpretation of deep inelastic scattering

abstract:
  We analyze data on deep inelastic scattering of electrons from the proton
using ideas from standard many-body theory involving {\em bound} constituents
subject to {\em interactions}. This leads us to expect, at large three-momentum
transfer ${\bf{q}}$, scaling in terms of the variable $\tilde{y}=\nu-{\bf
|q|}$. The response at constant ${\bf |q|}$ scales well in this variable.
Interaction effects are manifestly displayed in this approach. They are
illustrated in two examples.


title: Properties of Strange Hadronic Matter in Bulk and in Finite Systems

abstract:
  The hyperon-hyperon potentials due to a recent SU(3) Nijmegen soft-core
potential model are incorporated within a relativistic mean field calculation
of strange hadronic matter. We find considerably higher binding energy in bulk
matter compared to several recent calculations which constrain the composition
of matter. For small strangeness fractions, matter is dominated by a
composition of nucleons, Lambdas, and Xis, and the calculated binding energy
closely follows that calculated by using the hyperon potentials of our previous
calculations. For larger strangeness fractions, the calculated binding energy
increases substantially beyond any previous calculation due to a phase
transition into Sigma and Xi dominated matter. We also compare bulk matter
calculations with finite system calculations, again highlighting the
consequences of reducing the Coulomb destabilizing effects in finite strange
systems.


title: Pion electroproduction on the nucleon and the generalized GDH sum rule

abstract:
  Results of the recently developed unitary isobar model (MAID) are presented
for the spin asymmetries, structure functions and relevant sum rules in the
resonance region. The model describes the presently available data for
single-pion photo- and electroproduction in the resonance region below Wcm = 2
GeV very well. It is based on Born terms and resonance contributions, and the
respective multipoles are constructed in a gauge-invariant and unitary way for
each partial wave. The eta production is included in a similar way, while the
contribution of more-pion and higher channels is modeled by comparison with the
total cross sections and simple phenomenological assumptions. Our evaluation of
the energy-weighted integrals is in good agreement for the proton but shows big
discrepancies for the neutron.


title: Comparison of Relativistic Nucleon-Nucleon Interactions

abstract:
  We investigate the difference between those relativistic models based on
interpreting a realistic nucleon-nucleon interaction as a perturbation of the
square of a relativistic mass operator and those models that use the method of
Kamada and Gl\"ockle to construct an equivalent interaction to add to the
relativistic mass operator. Although both models reproduce the phase shifts and
binding energy of the corresponding non-relativistic model, they are not
scattering equivalent. The example of elastic electron-deuteron scattering in
the one-photon-exchange approximation is used to study the sensitivity of
three-body observables to these choices. Our conclusion is that the differences
in the predictions of the two models can be understood in terms of the
different ways in which the relativistic and non-relativistic $S$-matrices are
related. We argue that the mass squared method is consistent with conventional
procedures used to fit the Lorentz-invariant cross section as a function of the
laboratory energy.


title:
The role of three-body collisions in phi-meson production processes near
  threshold

abstract:
  The amplitude of subthreshold phi-meson production is calculated using
dominant tree-level diagrams for three-body collisions. It is shown that the
production can overwhelmingly be described by two-step processes. The effect of
the genuine three-body contribution (i.e. the contribution which cannot be
factorized) is discussed. The production rate of phi-mesons is presented for
proton induced reactions on carbon.


title: Dyson-Schwinger Equations: Density, Temperature and Continuum Strong QCD

abstract:
  Continuum strong QCD is the application of models and continuum quantum field
theory to the study of phenomena in hadronic physics, which includes; e.g., the
spectrum of QCD bound states and their interactions; and the transition to, and
properties of, a quark gluon plasma. We provide a contemporary perspective,
couched primarily in terms of the Dyson-Schwinger equations but also making
comparisons with other approaches and models. Our discourse provides a
practitioners' guide to features of the Dyson-Schwinger equations [such as
confinement and dynamical chiral symmetry breaking] and canvasses
phenomenological applications to light meson and baryon properties in cold,
sparse QCD. These provide the foundation for an extension to hot, dense QCD,
which is probed via the introduction of the intensive thermodynamic variables:
chemical potential and temperature. We describe order parameters whose
evolution signals deconfinement and chiral symmetry restoration, and chronicle
their use in demarcating the quark gluon plasma phase boundary and
characterising the plasma's properties. Hadron traits change in an equilibrated
plasma. We exemplify this and discuss putative signals of the effects. Finally,
since plasma formation is not an equilibrium process, we discuss recent
developments in kinetic theory and its application to describing the evolution
from a relativistic heavy ion collision to an equilibrated quark gluon plasma.


title:
Effect of changes in meson properties in a nuclear medium - $J/\Psi$
  dissociation in nuclear matter, and meson-nucleus bound states

abstract:
  We discuss the effect of changes in meson properties in a nuclear medium on
physical observables, notably, $J/\Psi$ dissociation on pion and $\rho$ meson
comovers in relativistic heavy ion collisions, and the prediction of the
$\omega$-, $\eta$- and $\eta'$-nuclear bound states.


title: Transition Strength Sums and Quantum Chaos in Shell Model States

abstract:
  For the embedded Gaussian orthogonal ensemble (EGOE) of random matrices, the
strength sums generated by a transition operator acting on an eigenstate vary
with the excitation energy as the ratio of two Gaussians. This general result
is compared to exact shell model calculations, with realistic interactions, of
spherical orbit occupancies and Gamow-Teller strength sums in some $(ds)$ and
$(fp)$ shell examples. In order to confirm that EGOE operates in the chaotic
domain of the shell model spectrum, calculations are carried out using two
different interpolating hamiltonians generating order-chaos transitions. Good
agreement is obtained in the chaotic domain of the spectrum, and strong
deviations are observed as nuclear motion approaches a regular regime
(transition strength sums appear to follow the Dyson's $\Delta_3$ statistic).
More importantly, they shed new light on the newly emerging understanding that
in the chaotic domain of isolated finite interacting many particle systems
smoothed densities (they include strength functions) define the statistical
description of these systems and these densities follow from embedded random
matrix ensembles; some EGOE calculations to this end are presented.


title: DSE Hadron Phenomenology

abstract:
  A perspective on the contemporary use of Dyson-Schwinger equations, focusing
on some recent phenomenological applications: a description and unification of
light-meson observables using a one-parameter model of the effective
quark-quark interaction, and studies of leptonic and nonleptonic nucleon form
factors.


title: Photoproduction of Pseudoscalar Mesons from Nuclei

abstract:
  The subject of this doctoral study is the pseudoscalar meson photoproduction
from nuclei. Two types of processes are investigated in this regard: coherent
and quasifree processes. In the case of the coherent process, we study it for
the photoproduction of pion and eta mesons. We place special emphasis on the
various sources that put into question earlier
nonrelativistic-impulse-approximation calculations. These include: final-state
interactions, relativistic effects, off-shell ambiguities, and violations to
the impulse approximation. By far the largest uncertainty emerges from the
ambiguity in extending the many on-shell-equivalent representations of the
elementary amplitude off the mass shell. In the case of the quasifree process,
we study it for the photoproduction of the kaon meson. We compute the recoil
polarization of the lambda-hyperon and the photon asymmetry as well as the
differential cross section. By introducing the notion of a ``bound-nucleon
propagator'' we exploit Feynman's trace techniques to develop closed-form,
analytic expressions for all photoproduction observables. Our results indicate
that polarization observables are sensitive only to the fundamental physics,
making them ideal tools for the study of modifications to the elementary
process in the nuclear medium.


title:
Effective Field Theory For Nuclei: Confronting Fundamental Questions in
  Astrophysics

abstract:
  Fundamental issues involving nuclei in the celebrated solar neutrino problem
are discussed in terms of an effective field theory adapted to nuclear few-body
systems, with a focus on the proton fusion process and the hep process. Our
strategy in addressing these questions is to combine chiral perturbation theory
-- an effective field theory of QCD -- with an accurate nuclear physics
approach to arrive at a more effective effective field theory that reveals and
exploits a subtle role of the chiral-symmetry scale in short-distance effects
encoded in short-range nuclear correlations. Our key argument is drawn from the
close analogy of the principal weak matrix element figuring in the hep process
to the suppressed matrix elements in the polarized neutron-proton capture at
threshold currently being measured in the laboratories.


title:
Dynamic and Quasistatic Trajectories in Quasifission Reactions and
  Particle Emission

abstract:
  We show that the quasifission paths predicted by the one-body dissipation
dynamics, in the slowest phase of a binary reaction, follow a quasistatic path,
which represents a sequence of states of thermal equilibrium at a fixed value
of the deformation coordinate. This establishes the use of the statistical
particle-evaporation model in the case of dynamical time-evolving systems. Pre-
and post-scission multiplicities of neutrons and total multiplicities of
protons and alpha particles in fission reactions of 63Cu+92Mo, 60Ni+100Mo,
63Cu+100Mo at 10 MeV/u and 20Ne+144,148,154Sm at 20 MeV/u are reproduced
reasonably well with statistical model calculations performed along dynamic
trajectories whose slow stage (from the most compact configuration up to the
point where the neck starts to develop) lasts some 35x10^{-21} s.


title: Quantum Monte Carlo Calculations of Pion Scattering from Li

abstract:
  We show that the neutron and proton transition densities predicted by recent
quantum Monte Carlo calculations for A=6,7 nuclei are consistent with pion
scattering from 6Li and 7Li at energies near the Delta resonance. This has
provided a microscopic understanding of the enhancement factors for quadrople
excitations, which were needed to describe pion inelastic scattering within the
nuclear shell model of Cohen and Kurath.


title: Quantum Hadrodynamics: Evolution and Revolution

abstract:
  The underlying philosophy and motivation for quantum hadrodynamics (QHD),
namely, relativistic field theories of nuclear phenomena featuring manifest
covariance, have evolved over the last quarter century in response to
successes, failures, and sharp criticisms. A recent revolution in QHD, based on
modern effective field theory and density functional theory perspectives,
explains the successes, provides antidotes to the failures, rebuts the
criticisms, and focuses the arguments in favor of a covariant representation.


title: The halo of the exotic nucleus 11Li: a single Cooper pair

abstract:
  If neutrons are progressively added to a normal nucleus, the Pauli principle
forces them into states of higher momentum. When the core becomes
neutron-saturated, the nucleus expels most of the wavefunction of the last
neutrons outside to form a halo, which because of its large size can have lower
momentum. It is an open question how nature stabilizes such a fragile system
and provides the glue needed to bind the halo neutrons to the core. Here we
show that this problem is similar to that of the instability of the normal
state of an electron system at zero temperature solved by Cooper, solution
which is at the basis of BCS theory of superconductivity. By mimicking this
approach using, aside from the bare nucleon-nucleon interaction, the long
wavelength vibrations of the nucleus $^{11}$Li, the paradigm of halo nuclei, as
tailored glues of the least bound neutrons, we are able to obtain a unified and
quantitative picture of the observed properties of $^{11}$Li.


title: Kinetic energy and spin-orbit splitting in nuclei near neutron drip line

abstract:
  Two important ingredients of nuclear shell-structure, kinetic energy and
spin-orbit splitting, are studied as a function of orbital angular momenta \ell
and binding energies, when binding energies of neutrons decrease towards zero.
If we use the standard parameters of the Woods-Saxon potential in \beta stable
nuclei and approach the limit of zero binding energy from 10 MeV, the
spin-orbit splitting for n=1 orbitals decreases considerably for \ell=1, while
for \ell > 2 little decreasing is observed in the limit. In contrast, the
kinetic energy decreases considerably for \ell \simleq 3. The smaller the \ell
values of orbitals, the larger the decreasing rate of both kinetic energy and
spin-orbit splitting. The dependence of the above bservation on the diffuseness
of potentials is studied.


title: Soft Modes, Resonances and Quantum Transport

abstract:
  Effects of the propagation of particles, which have a finite life-time and an
according width in their mass spectrum, are discussed in the context of
transport description. First, the importance of coherence effects
(Landau-Pomeranchuk-Migdal effect) on production and absorption of field quanta
in non-equilibrium dense matter is considered. It is shown that classical
diffusion and Langevin results correspond to re-summation of certain
field-theory diagrams formulated in terms of full non-equilibrium Green's
functions. Then the general properties of broad resonances in dense and hot
systems are discussed in the framework of a self-consistent and conserving
Phi-derivable method of Baym at the examples of the rho-meson in hadronic
matter and the pion in dilute nuclear matter. Further we address the problem of
a transport description that properly accounts for the damping width of the
particles. The Phi-derivable method generalized to the real-time contour
provides a self-consistent and conserving kinetic scheme. We derive a
generalized expression for the non-equilibrium kinetic entropy flow, which
includes corrections from fluctuations and mass-width effects. In special cases
an H-theorem is proved. Memory effects in collision terms give contributions to
the kinetic entropy flow that in the Fermi-liquid case recover the famous
bosonic type T^3 ln T correction to the specific heat of liquid Helium-3. At
the example of the pion-condensate phase transition in dense nuclear matter we
demonstrate important part played by the width effects within the quantum
transport.


title: Three-Nucleon Forces for the New Millennium

abstract:
  Most nuclear physics ranges from insensitive to relatively insensitive to
many-nucleon forces. The dominant ingredient in calculations of nuclear
properties is the nucleon-nucleon potential. Three-nucleon forces nevertheless
play an important role in nuclear physics because of the great precision of
modern calculational methods for systems of relatively few nucleons. We explore
the reasons why many-body forces are weak in nuclei by using a classification
scheme for such forces that is based on dimensional power counting, which is
used to organize chiral perturbation theory. An assessment will be made of how
close we are to a ``standard'' three-nucleon force. Recent advances in
determining the significance of three-nucleon forces will also be discussed.


title: A netron halo in 8He

abstract:
  The structure of $^8$He is investigated within a three-cluster microscopic
model. The three-cluster configuration $\alpha+^2n+^2n$ was used to describe
the properties of the ground state of the nucleus. The obtained results
evidently indicate the existence of a neutron halo in $^8$He.


title: Chiral Unitary Approach to the Kaon Nucleus Interaction and Kaonic Atoms

abstract:
  We review recent work on various topics related to the modification of kaon
properties in nuclei. After a brief exposition of the kaon-nucleon and
kaon-nucleus interaction, results from the application to kaonic atoms,
renormalization of the f0 and a0 scalar resonances in nuclei and phi decay in
the nucleus are shown.


title: Neutron Structure Function and A=3 Mirror Nuclei

abstract:
  We investigate deep inelastic scattering from He-3 and H-3 within a
conventional convolution treatment of binding and Fermi motion effects. Using
realistic Faddeev wave functions together with a nucleon spectral function, we
demonstrate that the free neutron structure function can be extracted in
deep-inelastic scattering from A=3 mirror nuclei, with nuclear effects
canceling to within 2% for x < 0.85.


title:
Applicability of the orientation average formula in heavy-ion fusion
  reactions of deformed nuclei

abstract:
  In heavy-ion fusion reactions involving a well deformed nucleus, one often
assumes that the orientation of the target nucleus does not change during the
reaction. We discuss the accuracy of this procedure by analyzing the excitation
function of the fusion cross section and the fusion barrier distribution in the
reactions of $^{154}$Sm target with various projectiles ranging from $^{12}$C
to $^{40}$Ar. It is shown that the approximation gradually looses its accuracy
with increasing charge product of the projectile and target nuclei because of
the effects of finite excitation energy of the target nucleus. The relevance of
such inaccuracy in analyzing the experimental data is also discussed.


title: Weak proton capture on 3He

abstract:
  The astrophysical S-factor for the proton weak capture on 3He is calculated
with correlated-hyperspherical-harmonics bound and continuum wave functions
corresponding to realistic Hamiltonians consisting of the Argonne v14 or
Argonne v18 two-nucleon and Urbana-VIII or Urbana-IX three-nucleon
interactions. The nuclear weak charge and current operators have vector and
axial-vector components, that include one- and many-body terms. All possible
multipole transitions connecting any of the p 3He S- and P-wave channels to the
4He bound state are considered. The S-factor at a p 3He center-of-mass energy
of 10 keV, close to the Gamow-peak energy, is predicted to be 10.1 10^{-20} keV
b with the AV18/UIX Hamiltonian, a factor of about 4.5 larger than the value
adopted in the standard solar model. The P-wave transitions are found to be
important, contributing about 40 % of the calculated S-factor. The energy
dependence is rather weak: the AV18/UIX zero-energy S-factor is 9.64 10^{-20}
keV b, only 5 % smaller than the 10 keV result quoted above. The model
dependence is also found to be weak: the zero-energy S-factor is calculated to
be 10.2 10^{-20} keV b with the older AV14/UVIII model, only 6 % larger than
the AV18/UIX result. Our best estimate for the S-factor at 10 keV is therefore
(10.1 \pm 0.6) 10^{-20} keV b, when the theoretical uncertainty due to the
model dependence is included. This value for the calculated S-factor is not as
large as determined in fits to the Super-Kamiokande data in which the hep flux
normalization is free. However, the precise calculation of the S-factor and the
consequent absolute prediction for the hep neutrino flux will allow much
greater discrimination among proposed solar neutrino oscillation solutions.


title: A Dirac-Hartree-Bogoliubov approximation for finite nuclei

abstract:
  We develop a complete Dirac-Hartree-Fock-Bogoliubov approximation to the
ground state wave function and energy of finite nuclei. We apply it to
spin-zero proton-proton and neutron-neutron pairing within the
Dirac-Hartree-Bogoliubov approximation (we neglect the Fock term), using a
zero-range approximation to the relativistic pairing tensor. We study the
effects of the pairing on the properties of the even-even nuclei of the
isotopic chains of Ca, Ni and Sn (spherical) and Kr and Sr (deformed), as well
as the $N$=28 isotonic chain, and compare our results with experimental data
and with other recent calculations.


title:
Muon capture on nuclei with N > Z, random phase approximation, and
  in-medium renormalization of the axial-vector coupling constant

abstract:
  We use the random phase approximation to describe the muon capture rate on
${}^{44}$Ca,${}^{48}$Ca, ${}^{56}$Fe, ${}^{90}$Zr, and ${}^{208}$Pb. With
${}^{40}$Ca as a test case, we show that the Continuum Random Phase
Approximation (CRPA) and the standard RPA give essentially equivalent
descriptions of the muon capture process. Using the standard RPA with the free
nucleon weak form factors we reproduce the experimental total capture rates on
these nuclei quite well. Confirming our previous CRPA result for the $N = Z$
nuclei, we find that the calculated rates would be significantly lower than the
data if the in-medium quenching of the axial-vector coupling constant were
employed.


title:
Seniority isomerism in proton-rich N=82 isotones and its indication to
  stiffness of the Z=64 core

abstract:
  The $10^+$ and $27/2^-$ isomers of the $Z>64$, $N=82$ nuclei are investigated
in the shell model framework. We derive an extended seniority reduction formula
for the relevant $E2$ transition strengths. Based on the extended formula, as
well as on the approximate degeneracy among the $0h_{11/2}$, $2s_{1/2}$ and
$1d_{3/2}$ orbits, we argue that the $B(E2)$ data require the $^{146}$Gd core
excitation. The energy levels of both parities and the $B(E2)$ values are
simultaneously reproduced by a multi-$j$ shell model calculation with the MSDI,
if the excitations from $(0g_{7/2}1d_{5/2})$ to $(0h_{11/2}2s_{1/2}1d_{3/2})$
are taken into account.


title:
Squeeze-out of nuclear matter in peripheral heavy-ion collisions and
  momentum-dependent effective interactions

abstract:
  We perform a systematic study of in-plane and out-of-plane proton and neutron
flow from nucleus-nucleus collisions within the BUU transport approach
employing different parameter sets for the mean-field potentials that can be
characterized by the nuclear incompressibility and the stiffness of the
momentum-dependent potential. We find that a simultaneous description of the
experimental data from the BEVALAC and the SIS on both the nucleon squeeze-out
$v_2$ and the in-plane flow $F$ at beam energies $E_{lab} = 0.15 \div 2$ AGeV
requires a mean field with strong momentum dependence, i.e. an effective Landau
mass $m^* \simeq 0.68 m_0$ at normal nuclear matter density $\rho_0=0.17$
fm$^{-3}$, where $m_0=0.938$ GeV is the bare nucleon mass. Some experimental
data on the squeeze-out require an even stiffer momentum dependence ($m^*
\approx 0.62 m_0$). All systems investigated are found to be compatible with
$m^*/m_0 = 0.65 \pm 0.03$.


title: Reaction Operator Approach to Non-Abelian Energy Loss

abstract:
  A systematic expansion of the induced inclusive gluon radiation associated
with jet production in a dense QCD plasma is derived using a reaction operator
formalism. Analytic expressions for the transverse momentum and light-cone
momentum distributions are derived to all orders in powers of the gluon opacity
of the medium, $N\sigma_g/A=L/\lambda_g$. The reaction operator approach also
leads to a simple algebraic proof of the ``color triviality'' of single
inclusive distributions and to a solvable set of recursion relations. The
analytic solution generalizes previous continuum solutions (BDMPS) for
applications to mesoscopic QCD plasmas. The solution is furthermore not
restricted to uncorrelated geometries and allows for evolving screening scales
as well as the inclusion of finite kinematic constraints. The later is
particularly important because below LHC energies the kinematic constraints
significantly decrease the non-abelian energy loss. Our solution for the
inclusive distribution also generalizes the finite order exclusive (tagged)
distribution case studied previously (GLV1). The form of the analytic solution
is well suited for numerical implementation in Monte Carlo event generators to
enable more accurate calculations of jet quenching in ultra-relativistic
nuclear collisions. Numerical results illustrating the constributions of the
first three orders in opacity are compared to the ``self-quenching'' hard
radiation intensity. A surprising result is that the induced gluon radiation
intensity is dominated by the (quadratic in $L$) first order opacity
contribution for realistic geometries and jet energies in nuclear collisions.


title:
The Reaction $pp\to pp\eta$ and the eta-Nucleon and Nucleon-Nucleon
  Interactions

abstract:
  The $\pi$, $\eta$ and $\rho$ exchange contributions to the cross-section for
the reaction $pp\to pp\eta$ near threshold are calculated with a
phenomenological description of the intermediate S11 (N(1535)) resonance for
all exchange mechanisms. The final state interaction in the $pp$ system is
described by realistic nucleon-nucleon interaction models. The sensitivity of
the results to the phenomenological models for the $\eta$-nucleon transition
amplitude and the nucleon-nucleon interaction is explored. The $\eta$ exchange
mechanism is found to play a dominant role. The off-shell behavior of the $\eta
N \to \eta N$ amplitude within the $\eta-$exchange amplitude leads to a result
significantly different from that obtained with the constant scattering length
approximation. The two-nucleon amplitudes that are associated with the short
range components of the nucleon-nucleon interaction contribute significantly to
the cross section.


title: Charmonium + Light Hadron Cross Sections

abstract:
  In this contribution we summarize experimental information and theoretical
results for the dissociation cross sections of charmonium by light hadrons.
Theoretical predictions for these RHIC-related processes differ by orders of
magnitude over the physically relevant energy range. The results found by the
author and collaborators using a constituent interchange model, which predicts
cross sections in the mb region near threshold, are discussed in more detail.


title: Properties of the predicted super-deformed band in ^{32}S

abstract:
  Properties like the excitation energy with respect to the ground state,
moments of inertia, B(E2) transition probabilities and stability against
quadrupole fluctuations at low spin of the predicted superdeformed band of
^{32}S are studied with the Gogny force D1S using the angular momentum
projected generator coordinate method for the axially symmetric quadrupole
moment. The Self Consistent Cranking method is also used to describe the
superdeformed rotational band. In addition, properties of some collective
normal deformed states are discussed.


title:
The high-precision, charge-dependent Bonn nucleon-nucleon potential
  (CD-Bonn)

abstract:
  We present a charge-dependent nucleon-nucleon (NN) potential that fits the
world proton-proton data below 350 MeV available in the year of 2000 with a
chi^2 per datum of 1.01 for 2932 data and the corresponding neutron-proton data
with chi^2/datum = 1.02 for 3058 data. This reproduction of the NN data is more
accurate than by any phase-shift analysis and any other NN potential. The
charge-dependence of the present potential (that has been dubbed `CD-Bonn') is
based upon the predictions by the Bonn Full Model for charge-symmetry and
charge-independence breaking in all partial waves with J <= 4. The potential is
represented in terms of the covariant Feynman amplitudes for one-boson exchange
which are nonlocal. Therefore, the off-shell behavior of the CD-Bonn potential
differs in a characteristic and well-founded way from commonly used local
potentials and leads to larger binding energies in nuclear few- and many-body
systems, where underbinding is a persistent problem.


title:
Relativistic Contributions to Deuteron Photodisintegration in the
  Bethe-Salpeter Formalism

abstract:
  In plane wave one-body approximation the reaction of deuteron
photodisintegration is considered in the framework of the Bethe-Salpeter
formalism for two-nucleon system. Results are obtained for deuteron vertex
function, which is the solution of the homogeneous Bethe-Salpeter equation with
a multi-rank separable interaction kernel, with a given analytical form. A
comparison is presented with predictions of non-relativistic, quasipotential
approaches and the equal time approximation. It is shown that important
contributions come from the boost in the arguments of the initial state vertex
function and the boost on the relative energy in the one-particle propagator
due to recoil.


title: On the mechanisms of superfluidity in atomic nuclei

abstract:
  A system of equations is obtained for the Cooper gap in nuclei. The system
takes two mechanisms of superfluidity into account in an approximation
quadratic in the phonon- production amplitude : a Bardeen- Cooper- Schrieffer
(BCS) type mechanism and a quasiparticle- phonon mechanism. These equations are
solved for 120 Sn in a realistic approximation. If the simple procedures
proposed are used to determine the new particle- particle interaction and to
estimate the average effect, then the contribution of the quasiparticle- phonon
mechanism to the observed width of the pairing gap is 26% and the BCS-type
contribution is 74%. This means that at least in semimagic nuclei pairing is of
a mixed nature - it is due to the two indicated mechanisms, the first being
mainly a surface mechanism and the second mainly a volume mechanism.


title: Mixing of the $f_0$ and $a_0$ scalar mesons in threshold photoproduction

abstract:
  We examine the photoproduction of the light scalar mesons $f_0$-$a_0 (980)$
with emphasis on isospin-violating $f_0$ and $a_0$ mixing due to the mass
difference between neutral and charged kaons. General forms for the invariant
amplitude for scalar meson photoproduction are derived, which yield expressions
for the invariant mass distribution of the final meson pairs. A final state
interaction form factor is obtained which incorporates $f_0$ and $a_0$ mesons,
$K\bar K$ threshold effects, and $f_0-a_0$ mixing. This form factor is applied
to predict the effective mass distribution of the $\pi\pi$ and $K\bar K$ pairs
in the vicinity of the $K\bar K$ threshold. An estimate of the role of isospin
mixing near threshold is provided. The potential role of polarized photons and
protons is also discussed.


title:
Radiation of single photons from $Pb+Pb$ collisions at the CERN SPS and
  quark hadron phase transition

abstract:
  The production of single photons in $Pb+Pb$ collisions at the CERN SPS as
measured by the WA98 experiment is analysed. A quark gluon plasma is assumed to
be formed initially, which expands, cools, hadronizes, and undergoes
freeze-out. A rich hadronic equation of state is used and the transverse
expansion of the interacting system is taken into account. The recent estimates
of photon production in quark-matter (at two loop level) along with the
dominant reactions in the hadronic matter leading to photons are used. About
50% of the single photons are seen to have a thermal origin. An addition of the
thermal and prompt photons is seen to provide a very good description of the
data. Most of the thermal photons having large transverse momenta arise from
the quark-matter, which contributes dominantly through the mechanism of
annihilation of quarks with scattering, and which in turn is possible only in a
hot and dense plasma of quarks and gluons. The results thus confirm the
formation of quark gluon plasma and the existence of this mechanism of the
production of single photons.


title: Microcanonical Lattice Gas Model for Nuclear Disassembly

abstract:
  Microcanonical calculations are no more difficult to implement than canonical
calculations in the Lattice Gas Model. We report calculations for a few
observables where we compare microcanonical model results with canonical model
results.


title: Lattice Gauge Theory - QCD from Quarks to Hadrons

abstract:
  Lattice Gauge Theory enables an ab initio study of the low-energy properties
of Quantum Chromodynamics, the theory of the strong interaction. I begin these
lectures by presenting the lattice formulation of QCD, and then outline the
benchmark calculation of lattice QCD, the light-hadron spectrum. I then proceed
to explore the predictive power of lattice QCD, in particular as it pertains to
hadronic physics. I will discuss the spectrum of glueballs, exotics and excited
states, before investigating the study of form factors and structure functions.
I will conclude by showing how lattice QCD can be used to study multi-hadron
systems, and in particular provide insight into the nucleon-nucleon
interaction.


title:
Anomalous Multiplicity Fluctuations from Phase Transitions in Heavy Ion
  Collisions

abstract:
  Event-by-event fluctuations and correlations between particles produced in
relativistic nuclear collisions are studied. The fluctuations in positive,
negative, total and net charge are closely related through correlations. In the
event of a phase transitions to a quark-gluon plasma, fluctuations in total and
net charge can be enhanced and reduced respectively which, however, is very
sensitive to the acceptance and centrality. If the colliding system experiences
strong density fluctuations due, e.g., to droplet formation in a first-order
phase transition, all fluctuations can be enhanced substantially. The
importance of fluctuations and correlations is exemplified by event-by-event
measurement of the multiplicities of $J/\Psi$'s and charged particles since
these observables should anti-correlate in the presence of co-mover or
anomalous absorption.


title:
Description of Excitations in Odd Non-magic Nuclei by the Green's
  Function Method

abstract:
  General equations for one- particle Green function in non- magic nuclei have
been derived where a pairing mechanism, which is analogous to the Bardeen-
Cooper- Schrieffer one, has been singled out explicitely. A "refining"
procedure for the phenomenological single- particle energies and pairing gaps
is formulated to avoid double counting of the phonon mixing if the initial data
of the problem are these phenomenological quantities. The general equations
obtained have been written in the squared phonon creation amplitude
approximation. This corresponds to taking quasiparticle$\otimes$phonon
configurations into account and, as shown in the work, is a good approximation
for semi- magic nuclei. Using this approximation the secular equation to
calculate excitations of odd non- magic nuclei has been obtained. The equation
takes ground state correlations into account completely and contains only the
squared energy variable. Distributions of single- particle strength in 119Sn
and 121}Sn have been calculated and reasonable agreement with the available
experiment has been obtained.