title: The quark star in the Quark Mean Field approach

abstract:
  The quark star in the quark mean field (QMF) extended to include the strange
mesons interaction is examined. The quark star properties in this model are
studied.


title: Contrasting N Delta and N N parity-violating asymmetries in nuclei

abstract:
  Several perspectives that can be opened by studying the electroexcitation of
the delta via parity-violating electron scattering from nuclei are examined,
working within the context of the relativistic Fermi gas model. A strong
enhancement of the left-right asymmetry in the delta sector compared with that
in the quasi-elastic regime is found and the potential to find clear signatures
for the axial-vector contributions of the nucleon-to-delta transition to the
asymmetry identified at specific low momentum transfer kinematics.
Possibilities of probing the deformation of the delta are also explored, and
using both the proton and nuclei as targets, the abilitiy to study the
asymmetry on neutrons is studied.


title: Physics of Dense and Superdense Matter

abstract:
  I discuss a few aspects of dense hadronic matter and superdense QCD matter
that are considered to be relevant to the physics of compact astrophysical
systems. The connection between a "bottom-up approach" and a "top-down
approach" is made with the help of an effective field theory strategy. Topics
treated are meson condensation going up from low density and color
superconductivity going down from asymptotic density with the approach to the
chiral phase transition made in terms of Brown-Rho scaling.


title:
Production of $a_0$-mesons in the reactions $\pi N \to a_0 N$ and $p p
  \to d a_0^+$ at GeV energies

abstract:
  We investigate the reactions $\pi N \to a_0 N$ and $p p \to d a_0^+$ near
threshold and at medium energies. An effective Lagragian approach and the Regge
pole model are applied to analyze different contributions to the cross section
of the reaction $\pi N \to a_0 N$. These results are used to calculate the
differential and total cross sections of the reaction $p p \to d a_0^+$ within
the framework of the two-step model in which two nucleons produce an
$a_0$-meson via $\pi$ -meson exchange and fuse to a deuteron. The necessity of
new measurements on $a_0$ production and branching fractions (of its decay to
the $K\bar K$ and $\pi\eta$ channels) is emphasized for clarifying the $a_0$
structure. Detailed predictions for the reaction $pp \to d a_0^+$ are presented
for the energy regime of the proton synchrotron COSY-J\"ulich.


title: Kaon photoproduction on the nucleon: overview of some applications

abstract:
  Some applications of the elementary kaon photoproduction process are
discussed: the investigation of missing resonances in the p(gamma,K+)Lambda
channel, the role of the P_{13}(1720) state in the p(gamma,K0)Sigma+ channel,
and the calculation of the Gerasimov-Drell-Hearn sum rule. For the latter, we
present an extension of our previous study to higher energies.


title: Nuclear Transparency in Heavy Ion Collisions at 14.6 GeV/nucleon

abstract:
  The probability of a projectile nucleon to traverse a target nucleus without
interaction is calculated for central Si-Pb collisions and compared to the data
of E814. The calculations are performed in two independent ways, via Glauber
theory and using the transport code UrQMD. For central collisions Glauber
predictions are about 30 to 50% higher than experiment, while the output of
UrQMD does not show the experimental peak of beam rapidity particles.


title:
Capture rate and neutron helicity asymmetry for ordinary muon capture on
  hydrogen

abstract:
  Applying heavy-baryon chiral perturbation theory to ordinary muon capture
(OMC) on a proton, we calculate the capture rate and neutron helicity asymmetry
up to next-to-next-to-leading order. For the singlet hyperfine state, we obtain
the capture rate Gamma_0 = 695 sec^{-1} while, for the triplet hyperfine state,
we obtain the capture rate Gamma_1 = 11.9 sec^{-1} and the neutron asymmetry
alpha_1 = 0.93. If the existing formalism is used to relate these atomic
capture rates to Gamma_{liq}, the OMC rate in liquid hydrogen, then Gamma_{liq}
corresponding to our improved values of Gamma_0 and Gamma_1 is found to be
significantly larger than the experimental value, primarily due to the updated
larger value of g_A. We argue that this apparent difficulity may be correlated
to the specious anomaly recently reported for mu^- + p to n + nu_mu + gamma,
and we suggest a possibility to remove these two "problems" simply and
simultaneously by reexamining the molecular physics input that underlies the
conventional analysis of Gamma_{liq}.


title:
Many-body perturbation calculation of spherical nuclei with a separable
  monopole interaction: I. Finite nuclei

abstract:
  We present calculations of ground state properties of spherical, doubly
closed-shell nuclei from $^{16}$O to $^{208}$Pb employing the techniques of
many-body perturbation theory using a separable density dependent monopole
interaction. The model gives results in Hartree-Fock order which are of similar
quality to other effective density-dependent interactions. In addition, second
and third order perturbation corrections to the binding energy are calculated
and are found to contribute small, but non-negligible corrections beyond the
mean-field result. The perturbation series converges quickly, suggesting that
this method may be used to calculate fully correlated wavefunctions with only
second or third order perturbation theory. We discuss the quality of the
results and suggest possible methods of improvement.


title:
Diabatic Mean-Field Description of Rotational Bands in Terms of the
  Selfconsistent Collective Coordinate Method

abstract:
  Diabatic description of rotational bands provides a clear-cut picture for
understanding the back-bending phenomena, where the internal structure of the
yrast band changes dramatically as a function of angular momentum. A
microscopic framework to obtain the diabatic bands within the mean-field
approximation is presented by making use of the selfconsistent collective
coordinate method. Applying the framework, both the ground state rotational
bands and the Stockholm bands are studied systematically for the rare-earth
deformed nuclei. An overall agreement has been achieved between the calculated
and observed rotational spectra. It is also shown that the inclusion of the
double-stretched quadrupole-pairing interaction is crucial to obtain an overall
agreement for the even-odd mass differences and the rotational spectra
simultaneously.


title: The effects of meson mixing on dilepton spectra

abstract:
  The effect of scalar and vector meson mixing on the dilepton radiation from
hot and dense hadronic matter is estimated in different isospin channels. In
particular, we study the effect of $\sigma$-$\omega$ and $\rho-a_0$ mixing and
calculate the corresponding rates. Effects are found to be significant compared
to standard $\pi$-$\pi$ and $K$-${\bar K}$ annihilations. While the mixing in
the isoscalar channel mostly gives a contribution in the invariant mass range
between the two-pion threshold and the $\omega$ peak, the isovector channel
mixing induces an additional peak just below that of the $\phi$.
Experimentally, the dilepton signals from $\rho$-$a_0$ mixing seem to be more
tractable than those from $\sigma$-$\omega$ mixing.


title:
Improvement of the extended P+QQ interaction by modifying the monopole
  field

abstract:
  The extended pairing plus $QQ$ interaction with the $J$-independent isoscalar
proton-neutron force as an average monopole field, which has succeeded in
describing collective yrast states of $N \approx Z$ even-$A$ nuclei, is
improved.
  The improvement is accomplished by adding small monopole terms
  (relevant to spectroscopy) to the average monopole field
  (indispensable to the binding energy). This modification extends the
applicability of the interaction to nuclei with $N \approx 28$ such as
$^{48}$Ca, and moreover improves energy levels of noncollective states.
  The modified interaction successfully describes not only even-$A$ but also
odd-$A$ nuclei in the $f_{7/2}$ shell region.
  Results of exact shell model calculations in the model space
  ($f_{7/2}$, $p_{3/2}$, $p_{1/2}$) (its usefulness has been demonstrated
previously) are shown for $A$=47, 48, 49, 50 and 51 nuclei.


title:
Extraction of electromagnetic neutron form factors through inclusive and
  exclusive polarized electron scattering on polarized 3He target

abstract:
  Inclusive 3He(e,e') and exclusive 3He(e,e'n) processes with polarized
electrons and 3He have been theoretically analyzed and values for the magnetic
and electric neutron form factors have been extracted. In both cases the form
factor values agree well with the ones extracted from processes on the
deuteron. Our results are based on Faddeev solutions, modern NN forces and
partially on the incorporation of mesonic exchange currents.


title:
On the Solution of the Number-Projected Hartree-Fock-Bogoliubov
  Equations

abstract:
  The numerical solution of the recently formulated number-projected
Hartree-Fock-Bogoliubov equations is studied in an exactly soluble
cranked-deformed shell model Hamiltonian. It is found that the solution of
these number-projected equations involve similar numerical effort as that of
bare HFB. We consider that this is a significant progress in the mean-field
studies of the quantum many-body systems. The results of the projected
calculations are shown to be in almost complete agreement with the exact
solutions of the model Hamiltonian. The phase transition obtained in the HFB
theory as a function of the rotational frequency is shown to be smeared out
with the projection.


title: Tilted Rotation and Wobbling Motion in Nuclei

abstract:
  The self-consistent harmonic oscillator model including the three-dimensional
cranking term is extended to describe collective excitations in the random
phase approximation. It is found that quadrupole collective excitations
associated with wobbling motion in rotating nuclei lead to the appearance of
two- or three-dimensional rotation.


title:
The role of $\sigma$-meson in $\omega\to \pi\pi\gamma$ decays and the
  coupling constant $g_{\omega\sigma\gamma}$

abstract:
  We study the $\omega\to\pi\pi\gamma$ decays by adding to the amplitude
calculated within the framework of chiral perturbation theory and vector meson
dominance the amplitude of $\sigma$-meson intermediate state. We estimate the
coupling constant $g_{\omega\sigma\gamma}$ utilizing the experimental value of
the $\omega\to\pi^{0}\pi^{0}\gamma$ decay rate.


title:
Distorted wave impulse approximation analysis for spin observables in
  nucleon quasi-elastic scattering and enhancement of the spin-longitudinal
  response

abstract:
  We present a formalism of distorted wave impulse approximation (DWIA) for
analyzing spin observables in nucleon inelastic and charge exchange reactions
leading to the continuum. It utilizes response functions calculated by the
continuum random phase approximation (RPA), which include the effective mass,
the spreading widths and the \Delta degrees of freedom. The Fermi motion is
treated by the optimal factorization, and the non-locality of the
nucleon-nucleon t-matrix by an averaged reaction plane approximation. By using
the formalism we calculated the spin-longitudinal and the spin-transverse cross
sections, ID_q and ID_p, of 12C, 40Ca (\vec{p},\vec{n}) at 494 and 346 MeV. The
calculation reasonably reproduced the observed ID_q, which is consistent with
the predicted enhancement of the spin-longitudinal response function R_L.
However, the observed ID_p is much larger than the calculated one, which was
consistent with neither the predicted quenching nor the spin-transverse
response function R_T obtained by the (e,e') scattering. The Landau-Migdal
parameter g'_N\Delta for the N\Delta transition interaction and the effective
mass at the nuclear center m^*(r=0) are treated as adjustable parameters. The
present analysis indicates that the smaller g'_{N\Delta}(\approx 0.3) and
m^*(0) \approx 0.7 m are preferable. We also investigate the validity of the
plane wave impulse approximation (PWIA) with the effective nucleon number
approximation for the absorption, by means of which R_L and R_T have
conventionally been extracted.


title:
Time-Evolution of the Coherent and the Squeezed States of Many-Body
  Systems Based on the Basic Idea of the Boson Mapping and the TDHF Method

abstract:
  Various works performed by the present authors in the 1990s are reviewed. The
topics discussed in this paper are mainly related to the time-evolution of the
coherent and the squeezed states of the systems obeying the su(2)- and the
su(1,1)-algebra. The formulations are based on the basic idea of the boson
mapping and the TDHF theory in canonical form. Under the time-dependent
variational procedure for trial states appropriately chosen, the time-evolution
of the systems under investigation is described. Further, it is shown that this
method enables us to obtain the classical counterparts of the original quantal
systems.


title: Energy and Centrality Dependence of Rapidity Densities at RHIC

abstract:
  The energy and centrality dependence of the charged multiplicity per
participant nucleon is shown to be able to differentiate between final-state
saturation and fixed scale pQCD models of initial entropy production in
high-energy heavy-ion collisions. The energy dependence is shown to test the
nuclear enhancement of the mini-jet component of the initial conditions, while
the centrality dependence provides a key test of whether gluon saturation is
reached at RHIC energies. HIJING model predicts that the rapidity density per
participant increases with centrality, while the saturation model prediction is
essentially independent of centrality.


title:
Pair production with electron capture in peripheral collisions of
  relativistic heavy ions

abstract:
  The production of electron-positron pairs with the capture of the electron in
an atomic orbital is investigated for the conditions of the Relativistic Heavy
Ion Collider (RHIC) and the Large Hadron Collider LHC). Dirac wave functions
for the leptons are used, taking corrections to orders of Z.alpha into account.
The dependence on the transverse momentum transfer is studied and the accuracy
of the equivalent photon approximation is discussed as a function of the
nuclear charge.


title: Dirac-Brueckner Approach to Hyperon Interactions and Hypernuclei

abstract:
  The density dependent relativistic hadron (DDRH) theory is introduced as an
effective field theory for nuclei and hypernuclei. A Dirac-Brueckner approach
to in-medium nucleon-hyperon interactions is presented. Density dependent
meson-baryon vertices are determined from DBHF self-energies in infinite
matter. Scaling laws for hyperon vertices are derived from a diagrammatic
analysis of self-energies. In a local density approximation the DB vertices are
applied in relativistic DDRH Hartree calculations to finite hypernuclei. Lambda
single particle spectra and spin-orbit splittings are described reasonably well
over the whole mass region.


title: Deep inelastic scattering on asymmetric nuclei

abstract:
  We study deep inelastic scattering on isospin asymmetric nuclei. In
particular, the difference of the nuclear structure functions and the Gottfried
sum rule for the lightest mirror nuclei, 3He and 3H, are investigated. It is
found that such systems can provide significant information on charge symmetry
breaking and flavor asymmetry in the nuclear medium. Furthermore, we propose a
new method to extract the neutron structure function from radioactive isotopes
far from the line of stability. We also discuss the flavor asymmetry in the
Drell-Yan process with isospin asymmetric nuclei.


title:
A relation among the effective nucleon mass, the incompressibility and
  the effective $\sigma$-meson mass in nuclear matter

abstract:
  A relation among the effective nucleon mass $M^*$, the incompressibility $K$
and the effective $\sigma$-meson mass $m_{\rm s}^*$ in nuclear matter is
studied by using the relativistic nuclear model. We found that there is a
strong correlation between $M^*$ and $m_{\rm s}^*$, while there is only a weak
correlation between $K$ and $m_{\rm s}^*$. At the normal density, $m_{\rm s}^*$
is smaller than the one at zero density, if $M^*$ is smaller than 0.8 times of
the nucleon mass at zero density. It is also found that the off-shell effective
mass $\mu_{\rm s}^*$ is related directly to $K$ and $M^*$ at the normal
density.


title:
Semiempirical Shell Model Masses with Magic Number Z=126 for Translead
  Elements with N smaller or equal to 126

abstract:
  A semiempirical shell model mass equation based on magic number Z=126 and
applicable to translead elements with N smaller or equal to 126 is presented.
For alpha decay energies the equation is shown to have a high predictive power
and an rms deviation from the data of about 100 keV. The rms deviations for
masses and other mass differences are between about 200 and 300 keV.


title:
Bound-Free Electron-Positron Pair Production in Relativistic Heavy Ion
  Collisions

abstract:
  We study the bound-free electron-positron pair production in relativistic
heavy ion collisions to different bound states in a full Plane Wave Born
Approximation (PWBA) calculation. Exact Dirac wave functions are used for both
the bound electron and the free positron in the final states. Results for the
Relativistic Heavy Ion Collider RHIC as well as the forthcoming Large Hadron
Collider (LHC) are given. This process is one of the dominant beam loss
processes and can become critical for the operation with heavy ions. A simple
parameterization is given as well. We compare our results with calculations of
other groups.


title: Final State Interaction in Exclusive $(e,e'NN)$ Reactions

abstract:
  Contributions of nucleon-nucleon (NN) correlations, meson exchange currents
and the residual final state interactions (FSI) on exclusive two-nucleon
knock-out reactions induced by electron scattering are investigated. All
contributions are derived from the same realistic meson exchange model for the
NN interaction. Effects of correlations and FSI are determined in a consistent
way by solving the NN scattering equation, the Bethe-Goldstone equation, for
two nucleons in nuclear matter. One finds that the FSI re-scattering terms are
non-negligible even if the two nucleons are emitted back to back.


title: Multifragmentation - what the data tell us about the different models

abstract:
  We discuss what the presently collected data tell us about the mechanism of
multifragmentation by comparing the results of two different models, which
assume or show an opposite reaction scenario, with the recent high statistics
$4\pi$ experiments performed by the INDRA collaboration. We find that the
statistical multifragmentation model and the dynamical Quantum Molecular
Dynamics approach produce almost the same results and agree both quite well
with experiment. We discuss which observables may serve to overcome this
deadlock on the quest for the reaction mechanism. Finally we proof that even if
the system is in equilibrium, the fluctuation of the temperature due to the
smallness of the system renders the caloric curve useless for the proof of a
first order phase transition.


title:
Nucleon Resonances in Meson Nucleon Scattering with Strangeness
  Production

abstract:
  An effective Lagrangian model in a coupled channels framework is applied to
extract nucleon resonance parameters. In the K-matrix approximation, we
simultaneously analyze all the available data for the transitions from pi N to
five possible meson-baryon final states, pi N, pipi N, eta N, K Lambda, and
KSigma, in the energy range from pi N threshold up to W = 2 GeV. In this work,
we focus our efforts on the K Sigma channel. In particular, we include a set of
Delta resonances around 1900 MeV: the S31(1900), P31(1910), and P33(1920)
states. In most cases the parameters of nucleon resonances determined by the
fits are consistent with the commonly accepted values in the literature. We
find that in the low-energy region, the S11(1650), P11(1710), and P13(1720)
states are important for the p(pi-,K0)Sigma0 and p(pi-,K+)Sigma- processes
while the P33(1600) and D33(1700) states are significant for the pure I=3/2
reaction p(pi+,K+)Sigma+. In the high energy region, we find a D13 state at
1945 MeV which is important for the p(pi-,K0)Sigma0 reaction while the Delta
resonances around 1900 MeV show up significantly in the p(pi-,K+)Sigma- and
p(pi+,K+)Sigma+ processes.


title: Missing Nucleon Resonances in Kaon Production with Pions and Photons

abstract:
  Resonances with strong couplings to strangeness channels are investigated in
a coupled-channels framework of kaon production with pions and photons. We find
evidence for an additional D13 resonance around 1900 MeV that has a significant
decay width into the K Lambda final state. Such a state has been predicted in a
relativistic quark model at 1960 MeV with significant gamma N and K Lambda
branching ratios.


title: $E1-E2$ interference in the Coulomb dissociation of $^8$B

abstract:
  We investigate the effects arising out of the $E1 - E2$ interference in the
Coulomb dissociation of $^8$B at beam energies below and around 50 MeV/nucleon.
The theory has been formulated within a first order semiclassical scheme of
Coulomb excitation, in which both the ground state and the continuum state wave
functions of $^8$B enter as inputs. We find that the magnitude of the
interference could be large in some cases. However, there are some specific
observables which are free from the effects of the $E1 - E2$ interference,
which is independent of the models used to describe the structure of $^8$B.
This will be useful for the analysis of the breakup data in relation to the
extraction of the astrophysical factor $S_{17}(0)$.


title: Masses of the Sub-Nuclear Particles

abstract:
  The masses of the quarks and leptons are for the most part a mystery to
particle physicists. Currently there seems to be no correlation between the
masses of the elementary particles. This paper is an attempt to formulate a
theory that would begin to explain the relationship between the sub-nuclear
particle masses.


title: The $\rho$ Spectral Function in a Relativistic Resonance Model

abstract:
  We calculate the spectral function $A_\rho$ of the $\rho$ meson in nuclear
matter. The calculation is performed in the {\it low density} approximation,
where the in-medium self energy $\Sigma_{med}$ is completely determined by the
vacuum $\rho N$ forward scattering amplitude. This amplitude is derived from a
relativistic resonance model. In comparison to previous non-relativistic
calculations we find a much weaker momentum dependence of $\Sigma_{med}$,
especially in the transverse channel. Special attention is paid to
uncertainties in the model. Thus, we compare the impact of different coupling
schemes for the $RN\rho$ interaction on the results and discuss various
resonance parameter sets.


title: Quark Models of Baryon Masses and Decays

abstract:
  The application of quark models to the spectra and strong and electromagnetic
couplings of baryons is reviewed. This review focuses on calculations which
attempt a global description of the masses and decay properties of baryons,
although recent developments in applying large N_c QCD and lattice QCD to the
baryon spectrum are described. After outlining the conventional
one-gluon-exchange picture, models which consider extensions to this approach
are contrasted with dynamical quark models based on Goldstone-boson exchange
and an algebraic collective-excitation approach. The spectra and
electromagnetic and strong couplings that result from these models are compared
with the quantities extracted from the data and each other, and the impact of
various model assumptions on these properties is emphasized. Prospects for the
resolution of the important issues raised by these comparisons are discussed.


title: Delta-Hole Interaction in Nuclei and the Gamow-Teller Strength in ^90Nb

abstract:
  The recently obtained experimental result for the quenching of the GT sum
rule in the reaction ^90Zr(p,n)^90Nb is used to extract the value of the
Landau-Migdal parameter g_{N\Delta}', taking into account also the effect of
the finite range meson exchange interactions. The extracted value is compared
to the one obtained in the \pi+\rho exchange model by explicitly taking into
account the effects of antisymmetrization and short range correlations.
Although the \pi+\rho exchange model tends to give a somewhat stronger
quenching than observed experimentally, the results are consistent within the
experimental error bars if the quark model value for the parameter
f_\Delta/f_\pi is used.


title: Anti-Kaon Induced Reactions on the Nucleon

abstract:
  Using a previously established effective Lagrangian model we describe
anti-kaon induced reactions on the nucleon. The dominantly contributing
channels in the cm-energy region from threshold up to 1.72 GeV are included (K
N, \pi \Sigma, \pi \Lambda). We solve the Bethe-Salpeter equation in an unitary
$K$-matrix approximation.


title:
Three-body analysis of incoherent $\eta$-photoproduction on the deuteron
  in the near threshold region

abstract:
  A three-body calculation of the reaction $\gamma d\to\eta np$ in the energy
region from threshold up to 30 MeV above has been performed. The primary goal
of this study is to assess the importance of the three-body aspects in the
hadronic sector of this reaction. Results are presented for the $\eta$-meson
spectrum as well as for the total cross section. The three-body results differ
significantly from those predicted by a simple rescattering model in which only
first-order $\eta N$- and $NN$-interactions in the final state are considered.
The major features of the experimental data are well reproduced although right
at threshold the rather large total cross section could not be explained.


title:
Neutrino-Deuteron Scattering in Effective Field Theory at
  Next-to-Next-to Leading Order

abstract:
  We study the four channels associated with neutrino-deuteron breakup
reactions at next-to-next to leading order in effective field theory. We find
that the total cross-section is indeed converging for neutrino energies up to
20 MeV, and thus our calculations can provide constraints on theoretical
uncertainties for the Sudbury Neutrino Observatory. We stress the importance of
a direct experimental measurement to high precision in at least one channel, in
order to fix an axial two-body counterterm.


title: The Past and Future of Coulomb Dissociation in Hadron- and Astrophysics

abstract:
  Breakup reactions are generally quite complicated, they involve nuclear and
electromagnetic forces including interference effects. Coulomb dissociation is
an especially simple and important mechanism since the perturbation due to the
electric field of the nucleus is exactly known. Therefore firm conclusions can
be drawn from such measurements. Electromagnetic matrixelements, radiative
capture cross-sections and astrophysical S-factors can be extracted from
experiments. We describe the basic theory, give analytical results for higher
order effects in the dissociation of neutron halo nuclei and briefly review the
experimental results obtained up to now. Some new applications of Coulomb
dissociation for nuclear astrophysics and nuclear structure physics are
discussed.


title:
The Role of Meson Retardation in Deuteron Photodisintegration above Pion
  Threshold

abstract:
  Photodisintegration of the deuteron above $\pi$ threshold is studied in a
coupled channel approach including $N \Delta$ and $\pi d$ channels with
consideration of pion retardation in potentials and exchange currents. A much
improved description of total and differential cross sections in the energy
region between $\pi$ threshold and 400-450 MeV is achieved. With respect to
polarization observables, the description of the linear photon asymmetry and
the proton polarization remains problematic.


title: Compact and Loosely Bound Structures in Light Nuclei

abstract:
  A role of different components in the wave function of the weakly bound light
nuclei states was studied within the framework of the cluster model, taking
into account of orbitals "polarization". It was shown that a limited number of
structures associated with the different modes of nucleon motion can be of
great importance for such systems. Examples of simple and quite flexible trial
wave functions are given for the nuclei $^8$Be, $^6$He. Expressions for the
microscopic wave functions of these nuclei were found and used for the
calculation of basic nuclear characteristics, using well known central-exchange
nucleon-nucleon potentials.


title: Life time of resonances in transport simulations

abstract:
  We calculate the life time of a resonance in our recently developed framework
for a test-particle description of transport processes for states with
continuous mass spectra. The result differs from the expression commonly used
in transport simulations but agrees with the one derived by Danielewicz and
Pratt relating the life time to the scattering phase shift.


title:
Perspectives of $e^+e^-$ production in pp, pd and p Be reactions at SIS
  energies

abstract:
  We study dilepton production from pp, pd and p Be collisions from 1 - 5 GeV
including the $\pi^0$, $\eta$, $\omega$ and $\Delta$ Dalitz decays, direct
decays of vector mesons ($\rho$, $\omega$) as well as subthreshold $\rho$
production via baryonic resonances (e.g. $D_{13}(1520), P_{11}(1710)$). Our
calculations compare rather well with the pp and pd data from the DLS
Collaboration, however, overestimate slightly the 'old' p Be data from that
group. Futhermore, detailed predictions for differential dilepton spectra at
SIS energies are made with a high mass resolution that can be controlled
experimentally by the HADES Collaboration in near future.


title:
Application of the density dependent hadron field theory to neutron star
  matter

abstract:
  The density dependent hadron field (DDRH) theory, previously applied to
isospin nuclei and hypernuclei is used to describe $\beta$-stable matter and
neutron stars under consideration of the complete baryon octet. The
meson-hyperon vertices are derived from Dirac-Brueckner calculations of nuclear
matter and extended to hyperons. We examine properties of density dependent
interactions derived from the Bonn A and from the Groningen NN potential as
well as phenomenological interactions. The consistent treatment of the density
dependence introduces rearrangement terms in the expression for the baryon
chemical potential. This leads to a more complex condition for the
$\beta$-equilibrium compared to standard relativistic mean field (RMF)
approaches. We find a strong dependence of the equation of state and the
particle distribution on the choice of the vertex density dependence. Results
for neutron star masses and radii are presented. We find a good agreement with
other models for the maximum mass. Radii are smaller compared to RMF models and
indicate a closer agreement with results of non-relativistic Brueckner
calculations.


title: Kaon properties and cross sections in nuclear medium

abstract:
  Results for the $\pi + N \to \Lambda, \Sigma + K$ reactions in nuclear matter
of Ref. nucl-th/0004011 are presented. To evaluate the in-medium modification
of the reaction amplitude as a function of the baryonic density we introduce
relativistic, mean-field potentials for the initial, final and intermediate
mesonic and baryonic states in the resonance model. These vector and scalar
potentials were calculated using the quark meson coupling model. Contrary to
earlier work which has not allowed for the change of the cross section in
medium, we find that the data for kaon production at SIS energies are
consistent with a repulsive $K^+$-nucleus potential.


title: Coupling of Baryon Resonances to the $N \omega$ channel

abstract:
  We estimate the resonance coupling strength $f_{RN\omega}$ and $f_{RN\rho}$
from a Vector Meson Dominance (VMD) analysis. The isoscalar and isovector part
of the photon coupling are obtained separately from helicity amplitudes. The
reliability of this approach is tested by comparing VMD predictions for
$f_{RN\rho}$ with values obtained from fitting the hadronic decay widths into
$N \rho$. A reasonable agreement is found, but VMD tends to underestimate the
coupling constants. In order to confirm consistency with experimental data, we
calculate the cross-sections for photon-and pion induced reactions within a
{\it Breit-Wigner} model. Finally, we study how the properties of $\omega$
mesons in nuclear matter are affected from the excitation of resonance-hole
loops. For an $\omega$ at rest, we find a broadening of about 40 MeV, while at
higher momenta the effect of resonance excitations is reduced.


title: Sigma Decay at Finite Temperature and Density

abstract:
  Sigma decay and its relation with chiral phase transition are discussed at
finite temperature and density in the framework of the Nambu-Jona-Lasinio
model. The decay rate for the process sigma -> 2 pions to first order in a
1/N_c expansion is calculated as a function of temperature T and baryon density
n_b. In particular, only when the chiral phase transition happens around the
tricritical point, the sigma decay results in a non-thermal enhancement of
pions in the final state distributions in relativistic heavy ion collisions.


title:
An Analytic Solution of Hydrodynamic Equations with Source Terms in
  Heavy Ion Collisions

abstract:
  The energy and baryon densities in heavy ion collisions are estimated by
analytically solving a 1+1 dimensional hydrodynamical model with source terms.
Particularly, a competition between the energy and baryon sources and the
expansion of the system is discussed in detail.


title: Density Effect on Hadronization of a Quark Plasma

abstract:
  The hadronization cross section in a quark plasma at finite temperature and
density is calculated in the framework of Nambu--Jona-lasinio model with
explicit chiral symmetry breaking. In apposition to the familiar temperature
effect, the quark plasma at high density begins to hadronize suddenly. It leads
to a sudden and strong increase of final state pions in relativistic heavy ion
collisions which may be considered as a clear signature of chiral symmetry
restoration.


title:
Thermal and Nonthermal Pion Enhancements with Chiral Symmetry
  Restoration

abstract:
  The pion production by sigma decay and its relation with chiral symmetry
restoration in a hot and dense matter are investigated in the framework of the
Nambu-Jona-Lasinio model. The decay rate for the process sigma -> 2pion to the
lowest order in a 1/N_c expansion is calculated as a function of temperature T
and chemical potential mu. The thermal and nonthermal enhancements of pions
generated by the decay before and after the freeze-out present only in the
crossover region of the chiral symmetry transition. The strongest nonthermal
enhancement is located in the vicinity of the endpoint of the first-order
transition.


title:
Two-step contribution to the spin-longitudinal and spin-transverse cross
  sections of the quasielastic (p,n) reactions

abstract:
  The two-step contribution to the spin-longitudinal and the spin-transverse
cross sections of ^{12}C,^{40}Ca(p,n) reactions at 494 MeV and 346 MeV is
calculated. We use a plane-wave approximation and evaluate the relative
contributions from the one-step and the two-step processes. We found that the
ratios of the two-step to the one-step processes are larger in the
spin-transverse cross sections than in the spin-longitudinal ones. Combining
these results with the distorted-wave impulse approximation (DWIA) results we
obtained considerable two-step contributions to the spin-longitudinal and the
spin-transverse cross sections. The two-step processes are important in
accounting for the underestimation of the DWIA results for the
spin-longitudinal and the spin-transverse cross sections.


title:
Generalized polarizabilities of the proton in a constituent quark model
  revisited

abstract:
  We study low-energy virtual Compton scattering off the proton within the
framework of a nonrelativistic constituent quark model.
  The Compton tensor is divided into two separately gauge-invariant
contributions.
  The first consists of the groundstate propagation in the direct and crossed
channels together with an appropriately chosen term to satisfy gauge
invariance.
  The residual part contains the relevant structure information characterized
by the so-called generalized polarizabilities.
  We discuss two different schemes to obtain the generalized polarizabilities
from the residual term.
  Explicit predictions for the generalized polarizabilities are presented for
the Isgur-Karl model.
  Our results are compared with previous predictions in that model as well as
other approaches.


title: The reactions p + n --> d + omega and p + n --> d + phi near threshold

abstract:
  The reactions p+n-->d+omega and p+n-->d+phi are studied within a relativistic
meson-exchange model of hadronic interactions. Predictions for the total cross
sections and for the angular distributions of the vector mesons are presented.
The resulting cross sections near threshold are around 10 - 30 microb for
p+n-->d+omega$ and 200 - 250 nb for p+n-->d+phi. A moderate deviation of the
cross section ratio sigma_{p+n-->d+phi} / sigma_{p+n-->d+omega} from that of
the Okubo-Zweig-Iizuka rule is predicted.


title: Dyson-Schwinger calculations of meson form factors

abstract:
  The ladder-rainbow truncation of the set of Dyson-Schwinger equations is used
to study the pion and kaon electromagnetic form factors and the $\gamma^\star
\pi^0 \gamma$ transition form factor in impulse approximation. With model
parameters previously fixed by the pseudoscalar meson masses and decay
constants, the obtained form factors are in good agreement with the data.


title: Valence-quark distributions in the pion

abstract:
  We calculate the pion's valence-quark momentum-fraction probability
distribution using a Dyson-Schwinger equation model. Valence-quarks with an
active mass of 0.30 GeV carry 71% of the pion's momentum at a resolving scale
q_0=0.54 GeV = 1/(0.37 fm). The shape of the calculated distribution is
characteristic of a strongly bound system and, evolved from q_0 to q=2 GeV, it
yields first, second and third moments in agreement with lattice and
phenomenological estimates, and valence-quarks carrying 49% of the pion's
momentum. However, pointwise there is a discrepancy between our calculated
distribution and that hitherto inferred from parametrisations of extant
pion-nucleon Drell-Yan data.


title: Effective hadronic Lagrangian for charm mesons

abstract:
  An effective hadronic Lagrangian including the charm mesons is introduced to
study their interactions in hadronic matter. Using coupling constants that are
determined either empirically or by the SU(4) symmetry, we have evaluated the
absorption cross sections of $J/\psi$ and the scattering cross sections of $D$
and $D^*$ by $\pi$ and $\rho$ mesons.


title: Pairing anti-halo effect

abstract:
  We discuss pairing correlations in weakly bound neutron rich nuclei, by using
the coordinate-space Hartree-Fock-Bogolyubov approach which allows to take
properly into account the coupling to particle continuum. We show that the
additional pairing binding energy acts against a development of an infinite rms
radius, even in situations when an l=0 single-particle orbital becomes unbound.


title: Spatially inhomogeneous condensate in asymmetric nuclear matter

abstract:
  We study the isospin singlet pairing in asymmetric nuclear matter with
nonzero total momentum of the condensate Cooper pairs. The quasiparticle
excitation spectrum is fourfold split compared to the usual BCS spectrum of the
symmetric, homogeneous matter. A twofold splitting of the spectrum into
separate branches is due to the finite momentum of the condensate, the isospin
asymmetry, or the finite quasiparticle lifetime. The coupling of the isospin
singlet and triplet paired states leads to further twofold splitting of each of
these branches. We solve the gap equation numerically in the isospin singlet
channel in the case where the pairing in the isospin triplet channel is
neglected and find nontrivial solutions with finite total momentum of the
pairs. The corresponding phase assumes a periodic spatial structure which
carries a isospin density wave at constant total number of particles. The phase
transition from the BCS to the inhomogeneous superconducting phase is found to
be first order and occurs when the density asymmetry is increased above 0.25.
The transition from the inhomogeneous superconducting to the unpaired normal
state is second order. The maximal values of the critical total momentum (in
units of the Fermi momentum) and the critical density asymmetry at which
condensate disappears are $P_c/p_F = 0.3$ and $\alpha_c = 0.41$. The possible
spatial forms of the ground state of the inhomogeneous superconducting phase
are briefly discussed.


title: The Effect of Deformation on the Twist Mode

abstract:
  Using $^{12}$C as an example of a strongly deformed nucleus we calculate the
strengths and energies in the asymptotic (oblate) deformed limit for the
isovector twist mode operator $[rY^{1}\vec{l}]^{\lambda=2}t_{+}$ where l is the
orbital angular momentum. We also consider the $\lambda =1$ case. For
$\lambda=0$, the operator vanishes. Whereas in a $\Delta N=0$ Nilsson model the
summed strength is independent of the relative P$_{3/2}$ and P$_{1/2}$
occupancy when we allow for different frequencies $\omega_{i}$ in the x, y, and
z directions there is a weak dependency on deformation.


title: Supersymmetric Transformations in Coupled-Channel Systems

abstract:
  A transformation of supersymmetric quantum mechanics for N coupled channels
is presented, which allows the introduction of up to N degenerate bound states
without altering the remaining spectrum of the Hamiltonian. Phase equivalence
of the Hamiltonian can be restored by two successive supersymmetric
transformations at the same energy. The method is successfully applied to the
3S1-3D1 coupled channels of the nucleon-nucleon system and a set of Moscow-type
potentials is thus generated.


title:
Coulomb exchange and pairing contributions in nuclear
  Hartree-Fock-Bogoliubov calculations with the Gogny force

abstract:
  We present exact Hartree-Fock-Bogoliubov calculations with the finite range
density dependent Gogny force using a triaxial basis. For the first time, all
contributions to the Pairing and Fock Fields arising from the Gogny and Coulomb
interactions as well as the two-body correction of the kinetic energy have been
calculated in this basis. We analyze the relevance of these terms in different
regions of the periodic table at zero and high angular momentum. The validity
of commonly used approximations that neglect different terms in the variational
equations is also checked. We find a decrease of the proton pairing energies
mainly due to a Coulomb antipairing effect.


title: Meson Mixing and Dilepton Production in Heavy Ion Collisions

abstract:
  We study the possibility of $\rho-a_0$ mixing via N-N excitations in dense
nuclear matter. This mixing is found to induce a peak in the dilepton spectra
at an invariant mass equal to that of the $a_0$. We calculate the cross section
for dilepton production through mixing and we compare its size with that of
$\pi-\pi$ annihilation. In-medium masses and mixing angles are also calculated.
Some preliminary results of the mixing effect on the dilepton production rates
at finite temperature are also presented.


title:
Isospin dependence of liquid-gas phase transition in hot asymmetric
  nuclear matter

abstract:
  By using the Furnstahl, Serot and Tang's model, the effect of density
dependence of the effective nucleon-nucleon-rho-meson (NN-rho) coupling on the
liquid-gas phase transition in hot asymmetric nuclear matter is investigated. A
limit pressure p_lim has been found. We found that the liquid-gas phase
transition cannot take place if p>p_lim. The binodal surface for density
dependent NN-rho coupling situation is addressed.


title:
Strange quark matter: mapping QCD lattice results to finite baryon
  density by a quasi-particle model

abstract:
  A quasi-particle model is presented which describes QCD lattice results for
the 0, 2 and 4 quark-flavor equation of state. The results are mapped to finite
baryo-chemical potentials. As an application of the model we make a prediction
of deconfined matter with appropriate inclusion of strange quarks and consider
pure quark stars.


title: The effective \omega-meson mass with a vector field self-interaction

abstract:
  We calculate the effective mass m_\omega^* of the \omega-meson in nuclear
medium by the \sigma-\omega model with a vector field self-interaction (VFSI).
We found that the direct and the indirect effects of the VFSI almost cancel
each other and the result is changed only slightly at the normal density. The
VFSI makes m^*_\omega smaller at lower density and makes m_\omega^* larger at
higher density. However, both effects are not large.


title:
Theoretical study of the decay-out spin of superdeformed bands in the Dy
  and Hg regions

abstract:
  Decay of the superdeformed bands have been studied mainly concentrating upon
the decay-out spin, which is sensitive to the tunneling probability between the
super- and normal-deformed wells. Although the basic features are well
understood by the calculations, it is difficult to precisely reproduce the
decay-out spins in some cases. Comparison of the systematic calculations with
experimental data reveals that values of the calculated decay-out spins scatter
more broadly around the average value in both the $A \approx$ 150 and 190
regions, which reflects the variety of calculated tunneling probability in each
band.


title: E1 transitions between spin-dipole and Gamow-Teller giant resonances

abstract:
  The branching ratios for E1 transitions between the spin-dipole (SD) and
Gamow-Teller (GT) giant resonances in $^{90}$Nb and $^{208}$Pb are evaluated.
Assuming the main GT-state has the wave function close to that for the "ideal"
GT-state, we reduced the problem to calculate the SD and GT strength functions.
These strength functions are evaluated within an extended continuum-RPA
approach.


title: Direct-decay properties of charge-exchange spin giant resonances

abstract:
  An extended continuum-RPA approach is applied to describe direct-decay
properties of spin giant resonances in $^{208}$Bi and $^{90}$Nb. Partial
branching ratios for direct proton decay from these resonances are evaluated.
The branching ratio for $\gamma$-decay from the spin-dipole resonance to the
Gamow-Teller resonance (main peak) is estimated. The saturation-like behaviour
of the mean doorway-state spreading width in $^{208}$Pb is discussed in
connection with the branching ratio for direct proton decay from the
spin-monopole resonance and the Gamow-Teller strength distribution.


title: $\pi-N$ from an Extended Effective Field Theory

abstract:
  Third order chiral perturbation theory accounts for the $\pi-N$ scattering
phase shift data out to energies slightly below the position of the $\Delta$
resonance. The low energy constants are not accurately determined. Explicit
inclusion of the $\Delta$ field is favored.


title: From Hadrons to Nuclei: Crossing the Border

abstract:
  The study of nuclei predates by many years the theory of quantum
chromodynamics. More recently, effective field theories have been used in
nuclear physics to ``cross the border'' from QCD to a nuclear theory. We are
now entering the second decade of efforts to develop a perturbative theory of
nuclear interactions using effective field theory. This work describes the
current status of these efforts.


title: Nuclear Aspects of Nucleosynthesis in Massive Stars

abstract:
  Preliminary results of a new set of stellar evolution and nucleosynthesis
calculations for massive stars are presented. These results were obtained with
an extended reaction network up to Bi. The discussion focuses on the importance
of nuclear rates in pre- and post-explosive nucleosynthesis. The need for
further experiments to study specific reactions and nuclear properties (optical
alpha+nucleus potentials) is emphasized.


title: Algebraic model of baryon structure

abstract:
  We discuss properties of baryon resonances belonging to the Nucleon, Delta,
Sigma, Lambda, Xi and Omega families in a collective string-like model for the
nucleon, in which the radial excitations are interpreted as rotations and
vibrations of the string configuration. We find good overall agreement with the
available data. The main discrepancies are found for low lying S-wave states,
in particular N(1535), N(1650), Sigma(1750), Lambda*(1405), Lambda(1670) and
Lambda(1800).


title: Collective nature of $0^{+}$- states in deformed rare-earth nuclei

abstract:
  The description of the energiy spectra of $0^{+}$ states for rare-earth
nuclei has been done involving the degree of the collectivity of corresponding
$0^{+}$-state as a systematics parameter. Holshtein-Primakoff representation
leads to very good agreement with experiment. Within the framework of this
approach the parameter of the collectivity is mainly determined by pairs of
particles constructed on single ''effective'' level. The results may be helpful
both for nuclear structure experimentalists and theorists in their
investigations of low-lying states structure and transition probabilities.


title:
External Coulomb and angular momentum influence on isotope composition
  of nuclear fragments

abstract:
  The Markov chain statistical multifragmentation model predicts inhomogeneous
distributions of fragments and their isospin in the freeze-out volume caused by
an angular momentum and external long-range Coulomb field. These effects can
take place in peripheral nucleus-nucleus collisions at intermediate energies
and lead to neutron-rich isotopes produced in the midrapidity kinematical
region of the reactions.


title: Partial Dynamical Symmetry in a Fermionic Many-Body System

abstract:
  The concept of partial symmetry is introduced for an interacting fermion
system. The associated Hamiltonians are shown to be closely related to a
realistic nuclear quadrupole-quadrupole interaction. An application to $^{12}$C
is presented.


title: Central Nucleon-Nucleon Potential and Chiral Scalar Form Factor

abstract:
  The central two-pion exchange NN potential at large distances is studied in
the framework of relativistic chiral symmetry and related directly to the
nucleon scalar form factor, which describes the mass density of its pion cloud.
This relationship is well supported by phenomenology and allows the dependence
of the asymptotic potential on the nucleon mass to be assessed. Results in the
heavy baryon limit are about 25% larger than those corresponding to the
empirical nucleon mass in the region of physical interest. This indicates that
it is very important to keep this mass finite in precise descriptions of the NN
system and supports the efficacy of the relativistic chiral framework. One also
estimates the contribution of subleading effects and presents a simple
discussions of the role of the quark condensate in this problem.


title:
Cooper-Mesons in the Color-Flavor-Locked Superconducting Phase of Dense
  QCD

abstract:
  QCD superconductors in the color-flavor-locked (CFL) phase sustain
excitations (``Cooper'' mesons) that can be described as pairs of particles or
holes around a gapped Fermi surface. In weak coupling and to leading logarithm
accuracy the masses, decay constants and form factors of the scalar,
pseudoscalar, vector and axial-vector excitations, which explicitly are of
finite size, can be calculated exactly. Furthermore, the constraints of this
microscopic calculation on the effective-lagrangian description and the
computation of the generalized triangle anomaly are discussed.


title: Quantum corrections for pion correlations involving resonance decays

abstract:
  A method is presented to include quantum corrections into the calculation of
two-pion correlations for the case where particles originate from resonance
decays. The technique uses classical information regarding the space-time
points at which resonances are created. By evaluating a simple thermal model,
the method is compared to semiclassical techniques that assume exponential
decaying resonances moving along classical trajectories. Significant
improvements are noted when the resonance widths are broad as compared to the
temperature.


title: Relativistic Heavy--Ion Collisions in the Dynamical String--Parton Model

abstract:
  We develop and extend the dynamical string parton model. This model, which is
based on the salient features of QCD, uses classical Nambu-Got\=o strings with
the endpoints identified as partons, an invariant string breaking model of the
hadronization process, and interactions described as quark-quark interactions.
In this work, the original model is extended to include a phenomenological
quantization of the mass of the strings, an analytical technique for treating
the incident nucleons as a distribution of string configurations determined by
the experimentally measured structure function, the inclusion of the gluonic
content of the nucleon through the introduction of purely gluonic strings, and
the use of a hard parton-parton interaction taken from perturbative QCD
combined with a phenomenological soft interaction. The limited number of
parameters in the model are adjusted to $e^+e^-$ and $p $--$p$ data. Utilizing
these parameters, the first calculations of the model for $p $--$A$ and
$A$--$A$ collisions are presented and found to be in reasonable agreement with
a broad set of data.


title: Quantum Monte Carlo Methods for Nuclei at Finite Temperature

abstract:
  We discuss finite temperature quantum Monte Carlo methods in the framework of
the interacting nuclear shell model. The methods are based on a representation
of the imaginary-time many-body propagator as a superposition of one-body
propagators describing non-interacting fermions moving in fluctuating auxiliary
fields. Fermionic Monte Carlo calculations have been limited by a ``sign''
problem. A practical solution in the nuclear case enables realistic
calculations in much larger configuration spaces than can be solved by
conventional methods. Good-sign interactions can be constructed for realistic
estimates of certain nuclear properties. We present various applications of the
methods for calculating collective properties and level densities.


title: Signature of a Pairing Transition in the Heat Capacity of Finite Nuclei

abstract:
  The heat capacity of iron isotopes is calculated within the interacting shell
model using the complete $(pf+0g_{9/2})$-shell. We identify a signature of the
pairing transition in the heat capacity that is correlated with the suppression
of the number of spin-zero neutron pairs as the temperature increases. Our
results are obtained by a novel method that significantly reduces the
statistical errors in the heat capacity calculated by the shell model Monte
Carlo approach. The Monte Carlo results are compared with finite-temperature
Fermi gas and BCS calculations.


title:
Three-body system in leading order Effective Field Theory without
  three-body forces

abstract:
  The use of leading order effective field theory (EFT) to describe
neutron-deuteron scattering leads to integral equations that have unusual
behaviour: when only two-body interactions are included, the scattering
amplitude does not approach a limit when the cutoff used to solve the equations
is removed. It has recently been shown that this cutoff dependence can be
eliminated by the careful inclusion of a three-body force. In this paper we
show that the cutoff dependence is just a reflection of the fact that the
aforementioned integral equations admit an infinite number of solutions amongst
which only one corresponds to the physical scattering amplitude. We show how to
numerically extract the physical scattering amplitude from the general solution
and in this way explicitly demonstrate that the amplitude for a particle
scattering off a two-body bound state, in leading order EFT, is in fact
determined entirely by two-body forces.


title:
Suppression of Quarkonium Production in Heavy Ion Collisions at RHIC and
  LHC

abstract:
  A model for the production of quarkonium states in the midrapidity region at
RHIC and LHC energy range is presented which explores well understood
properties of QCD only. An increase of the quarkonium hadronisation time with
the initial energy leads to a gradual change of the most important phenomena
from fixed target- to collider-energies. We evaluate nuclear effects in the
quarkonium production due to medium modification of the momentum distribution
of the heavy quarks produced in the hard interactions, i.e. due to the
broadening of the transverse momentum distribution. Other nuclear effects, i.e.
nuclear shadowing and parton energy loss, are also evaluated.


title: Thermodynamics of explosions

abstract:
  We present our first attempts to formulate a thermodynamics-like description
of explosions. The motivation is partly a fundamental interest in
non-equilibrium statistical physics, partly the resemblance of an explosion to
the late stages of a heavy-ion collision. We perform numerical simulations on a
microscopic model of interacting billiard-ball like particles, and we analyse
the results of such simulations trying to identify collective variables
describing the degree of equilibrium during the explosion.


title: Nucleon-nucleon scattering in a chiral constituent quark model

abstract:
  We study the nucleon-nucleon interaction in a chiral constituent quark model
by using the resonating group method, convenient for treating the interaction
between composite particles. The calculated phase shifts for the 3S1 and 1S0
channels show the presence of a strong repulsive core due to the combined
effect of the quark interchange and the spin-flavour structure of the effective
quark-quark interaction. Such a symmetry structure stems from the pseudoscalar
meson exchange between the quarks and is a consequence of the spontaneous
breaking of the chiral symmetry. We perform single and coupled channel
calculations and show the role of coupling of the $\Delta\Delta$ and hidden
color CC channels on the behaviour of the phase shifts.


title: Hybrid Baryons, a brief review

abstract:
  This contribution is a brief review of the status of hybrid baryons, which
are hypothetical baryons that incorporate a gluonic excitation. We first
summarize the status of hybrid mesons, since this closely related topic has
seen considerable recent activity with the identification of two exotic
candidates. Next we review theoretical expectations for the masses and quantum
numbers of hybrid baryons, which have come from studies of the bag model, QCD
sum rules and the flux tube model. Finally hybrid baryon experiment is
discussed, including suggestions for experimenters at COSY.


title: Neutrino Reactions on Deuteron

abstract:
  The cross sections for the \nu-d and \bar{\nu}-d reactions are calculated for
the incident energy up to E_\nu = 170 MeV, with the use of a phenomenological
Lagrangian approach. We assess and improve the reliability of the employed
calculational method by examining the dependence of the results on various
input and approximations that go into the calculation. The main points of
improvements over the existing work are: (1) use of the "modern" NN potentials;
(2) use of the more accurate nucleon weak-interaction form factors; (3)
monitoring the strength of a vertex that governs the exchange-current
contribution, with the use of data on the related process, n+p\to d+\gamma. In
addition to the total cross sections, we present various differential cross
sections that are expected to be useful for the SNO and other experiments. In
the low energy regime relevant to the solar neutrinos, the newly calculated
total cross sections agree with the existing literature values. The origins of
slight differences found for higher energies are discussed. The ratio between
the neutral-current and charged-current reaction cross sections is found to be
extremely stable against any variations in the input of our calculation.


title: Sub-barrier fusion of drip-line nuclei

abstract:
  We discuss the role of break-up process of a loosely-bound projectile in
subbarrier fusion reactions. Coupled-channels calculations are carried out for
$^{11}$Be + $^{208}$Pb and $^{4,6}$He + $^{238}$U reactions by discretizing in
energy the particle continuum states. Our calculations show that the coupling
to the break-up channel has two effects, namely the loss of flux and the
dynamical modulation of fusion potential. Their net effects differ depending on
the energy region. At energies above the Coulomb barrier, the former effect
dominates over the latter and cross sections for complete fusion are hindered
compared with the no coupling case. On the other hand, at below the barrier,
the latter effect is much larger than the former and complete fusion cross
sections are enhanced consequently.


title: SU(3) symmetry breaking in lower fp-shell nuclei

abstract:
  Results of shell-model calculations for lower fp-shell nuclei show that SU(3)
symmetry breaking in this region is driven by the single-particle spin-orbit
splitting. However, even though states of the yrast band exhibit SU(3) symmetry
breaking, the results also show that the yrast band B(E2) values are
insensitive to this fragmentation of the SU(3) symmetry; specifically, the
quadrupole collectivity as measured by B(E2) transition strengths between low
lying members of the yrast band remain high even though SU(3) appears to be
broken. Results for $^{44,46,48}Ti$ and $^{48}Cr$ using the Kuo-Brown-3
two-body interaction are given to illustrate these observations.


title:
Pairing-induced localization of the particle continuum in weakly bound
  nuclei

abstract:
  The Hartree-Fock-Bogolyubov (HFB) problem for the cutoff local energy-density
functional is solved numerically by using the Gor'kov formalism with an exact
treatment of the particle continuum. The contributions from the resonant and
"gas" continuum to the spectral density of the HFB eigenstates as well as the
shifting and broadening of the discrete HF hole orbitals are clearly
demonstrated with the illustrative example of the drip-line nucleus ^{70}Ca.
The structure of the neutron density distribution in the localized ground state
is analyzed, and the formation of its extended tail ("halo") is shown to be a
collective pairing effect.


title: Symmetry Violation in Heavy Nuclei

abstract:
  The advantage of searching for violation of Time Reversal Invariance in
neutron induced reactions using relative measurements of Time and Parity
violating effects is discussed. This approach gives the enhancement of
$T$-violating effects by many orders of magnitude and, at the same time,
decrees theoretical uncertainties and experimental errors.


title:
To the nature of intermediate- and short-range nucleon-nucleon
  interaction

abstract:
  Instead of the Yukawa mechanism for intermediate- and short-range interaction
some new approach based on formation of the symmetric six-quark bag in the
state $|(0s)^6[6]_X,L=0>$ dressed due to strong coupling to $\pi$, $\sigma$ and
$\rho$ fields are suggested. This new mechanism offers both a strong
intermediate-range attraction which replaces the effective $\sigma$-exchange
(or excitation of two isobars in the intermediate state) in traditional force
models and also short-range repulsion. Simple illustrative model is developed
which demonstrates clearly how well the suggested new mechanism can reproduce
$NN$ data.


title: Antiflow of kaons in relativistic heavy ion collisions

abstract:
  We compare relativistic transport model calculations to recent data on the
sideward flow of neutral strange K^0_s mesons for Au+Au collisions at 6 AGeV. A
soft nuclear equation of state is found to describe very well the positive
proton flow data measured in the same experiment. In the absence of kaon
potential, the K^0 flow pattern is similar to that of protons. The kaon flow
becomes negative if a repulsive kaon potential determined from the impulse
approximation is introduced. However, this potential underestimates the data
which exhibits larger antiflow. An excellent agreement with the data is
obtained when a relativistic scalar-vector kaon potential, that has stronger
density dependence, is used. We further find that the transverse momentum
dependence of directed and elliptic flow is quite sensitive to the kaon
potential in dense matter.


title:
Jet Quenching and Azimuthal Anisotropy of Large $p_T$ Spectra in
  Non-central High-energy Heavy-ion Collisions

abstract:
  Parton energy loss inside a dense medium leads to the suppression of large
$p_T$ hadrons and can also cause azimuthal anisotropy of hadron spectra at
large transverse momentum in non-central high-energy heavy-ion collisions. Such
azimuthal anisotropy is studied qualitatively in a parton model for heavy-ion
collisions at the RHIC energies. The coefficient $v_2(p_T)$ of the elliptic
anisotropy at large $p_T$ is found to be very sensitive to parton energy loss.
It decreases slowly with $p_T$ contrary to its low $p_T$ behavior where $v_2$
increases very rapidly with $p_T$. The turning point signals the onset of
contributions of hard processes and the magnitude of parton energy loss. The
centrality dependence of $v_2(p_T)$ is shown to be sensitive to both size and
density dependence of the parton energy loss and the later can also be studied
via variation of the colliding energy. The anisotropy coefficient
$v_2/\epsilon$ normalized by the spatial ellipticity $\epsilon$ is found to
decrease significantly toward semi-peripheral collisions, differing from the
hydrodynamic results for low $p_T$ hadrons. Constrained by the existing WA98
experimental data at the SPS energy on parton energy loss, both hadron spectra
suppression and azimuthal anisotropy at high $p_T$ are predicted to vanish for
$b>$7-8 fm in $Au+Au$ collisions at $\sqrt{s}=$130-200 GeV when the hadron
rapidity density per unit area of the initial overlapped region is less than
what is achieved in the central $Pb+Pb$ collisions at the SPS energy.


title: Classification of the Nuclear Multifragmentation Phase Transition

abstract:
  Using a recently proposed classification scheme for phase transitions in
finite systems [Phys.Rev.Lett.{\bf 84},3511 (2000)] we show that within the
statistical standard model of nuclear multifragmentation the predicted phase
transition is of first order.


title: Complex Langevin Equation and the Many-Fermion Problem

abstract:
  We study the utility of a complex Langevin (CL) equation as an alternative
for the Monte Carlo (MC) procedure in the evaluation of expectation values
occurring in fermionic many-body problems. We find that a CL approach is
natural in cases where non-positive definite probability measures occur, and
remains accurate even when the corresponding MC calculation develops a severe
``sign problem''. While the convergence of CL averages cannot be guaranteed in
principle, we show how convergent results can be obtained in three examples
ranging from simple one-dimensional integrals over quantum mechanical models to
a schematic shell model path integral.


title: Equal-time hierarchies for transport descriptions of fermionic fields

abstract:
  A transport theory which is not restricted to the gradient and quasi-particle
approximations is presented which is formulated in terms of the energy moments,
or equivalently the equal-time derivatives of the one-particle Green functions.
A set of infinite hierarchies of kinetic and constraint equations for
equal-time quantities for the spectral and the kinetic part of the one-particle
Green function are derived. The hierarchies for the spectral function truncate
automatically as in the mean field approximation. The possibility of a
systematic truncation of the hierarchies for the kinetic part is discussed. The
effects the quantum corrections are illustrated in a simple one-dimensional
model.


title:
Microscopic model approaches to fragmentation of nuclei and phase
  transitions in nuclear matter

abstract:
  The properties of excited nuclear matter and the quest for a phase transition
which is expected to exist in this system are the subject of intensive
investigations. High energy nuclear collisions between finite nuclei which lead
to matter fragmentation are used to investigate these properties. The present
report covers effective work done on the subject over the two last decades. The
analysis of experimental data is confronted with two major problems, the
setting up of thermodynamic equilibrium in a time-dependent fragmentation
process and the finite size of nuclei. The present status concerning the first
point is presented. Simple classical models of disordered systems are derived
starting with the generic bond percolation approach. These lattice and cellular
equilibrium models, like percolation approaches, describe successfully
experimental fragment multiplicity distributions. They also show the properties
of systems which undergo a thermodynamic phase transition. Physical observables
which are devised to show the existence and to fix the order of critical
behaviour are presented. Applications to the models are shown. Thermodynamic
properties of finite systems undergoing critical behaviour are advantageously
described in the framework of the microcanonical ensemble. Applications to the
designed models and to experimental data are presented and analysed.
Perspectives of further developments of the field are suggested.


title: Eta Production in Hadronic Interactions

abstract:
  A short, and definitely not a complete representation of \eta production
processes on hadrons is given. First of all, the different ways of obtaining
the \pi N \to \eta N and \pi N \to \eta N amplitudes are presented. After that,
an overview of results obtained using these amplitudes as input for calculating
processes like: NN \to \eta NN, pd \to \eta ^{3}He, \pi d \to \eta NN and \eta
d, \eta ^{3}He and \eta ^{4}He as well as \eta-light nuclei bond states, will
be given. The experimental and theoretical results will be reviewed. The opened
problems and the way how to solve them will be presented.


title: Coulomb Excitation of Double Giant Dipole Resonances

abstract:
  We implement the Brink-Axel hypothesis for the excitation of the double giant
dipole resonance (DGDR): The background states which couple to the one-phonon
giant dipole resonance are themselves capable of dipole absorption. These
states (and the ones which couple to the two-phonon resonance) are described in
terms of the Gaussian Orthogonal Ensemble of random matrices. We use
second-order time-dependent perturbation theory and calculate analytically the
ensemble-averaged cross section for excitation of the DGDR. Numerical
calculations illuminate the mechanism and the dependence of the cross section
on the various parameters of the theory, and are specifically performed for the
reaction $^{208}$Pb + $^{208}$Pb at a projectile energy of 640 MeV/nucleon. We
show that the contribution of the background states to the excitation of the
DGDR is significant. We find that the width of the DGDR, the energy-integrated
cross section and the ratio of this quantity over the energy-integrated cross
section for the single giant dipole resonance, all agree with experiment within
experimental errors. We compare our approach with that of Carlson {\it et al.}
who have used a similar physical picture.


title: Bubble Nuclei, Neutron Stars and Quantum Billiards

abstract:
  We briefly review the significance of quantum corrections in the total energy
of systems with voids: bubble nuclei, atomic clusters and the inhomogeneous
phase of neutron stars.


title: Pion loop fluctuations of constituent quarks and baryons

abstract:
  The implications of the pion (meson) degrees of freedom for baryon
properties, taken at the constituent quark and baryon levels are compared. It
is shown that there is a dramatic qualitative difference between two
approaches.


title:
Neutron unpolarized structure function F_2^n(x) from deep inelastic
  scattering off ^{3}He and ^{3}H

abstract:
  The possibility to safely extract the neutron deep inelastic structure
function $F_2^n(x)$ in the range $0 \le x \le 0.9$ from joint measurements of
deep inelastic structure functions of $^{3}He$ and $^{3}H$ is demonstrated.
While the nuclear structure effects are relevant, the model dependence in this
extraction linked to the $N-N$ interaction is shown to be weak.


title:
Can we determine the nuclear equation of state from heavy ion
  collisions?

abstract:
  We discuss the problems involved in extracting the nuclear equation-of-state
from heavy-ion collisions. We demonstrate that the equation of state becomes
effectively softer in non-equilibrium and this effect is observable in terms of
collective flow effects. Thus, non-equilibrium effects must be included in
transport descriptions on the level of the effective mean fields. A comparison
with transverse momentum, rapidity, and centrality selected flow data show the
reliability and limitations of the underlying interaction which was derived
from microscopic Dirac-Brueckner (DB) results.


title: Thermodynamical description of heavy ion collisions

abstract:
  We analyze the thermodynamical state of nuclear matter in transport
descriptions of heavy ion reactions. We determine thermodynamical variables
from an analysis of local momentum space distributions and compare to blast
model parameters from an analysis of fragment energy spectra. These
descriptions are applied to spectator and fireball matter in semi-central and
central Au+Au collisions at SIS-energies, respectively.


title: Parity Violation in Polarized-Gamma Proton Compton Scattering

abstract:
  Polarized beam gamma p Compton scattering provides a theoretically clean way
to extract the isovector parity violating pion-nucleon coupling constant
$h_{\pi NN}^{(1)}$. This channel is more tractable experimentally than the
recently proposed extraction of $h_{\pi NN}^{(1)}$ from the Bedaque-Savage
process --- polarized target gamma p compton scattering. The leading parity
violating effect is calculated using Heavy Baryon Chiral Perturbation Theory.
The size of the asymmetry is estimated to be ~ 4 10^{-8} for 120 MeV photon
energy.


title:
Interpretation of the First Data on Central Au+Au Collisions at
  Square-Root of s = 56 and 130 A GeV

abstract:
  We compare three semi-microscopic theories to the first data on particle
production in central Au+Au collisions taken at RHIC by the PHOBOS
collaboration as well as to existing data on central Pb+Pb collisions taken at
the SPS by the NA49 collaboration. LEXUS represents the SPS data quite well but
not the RHIC data, whereas the wounded nucleon model does the opposite. The
collective tube model fails to describe any of the data. This suggests a
transition in the dynamics of particle production between \sqrt{s} = 17 and 56
A GeV as one goes from the SPS to RHIC.


title: Liquid-gas phase transition in nuclear multifragmentation

abstract:
  The equation of state of nuclear matter suggests that at suitable beam
energies the disassembling hot system formed in heavy ion collisions will pass
through a liquid-gas coexistence region. Searching for the signatures of the
phase transition has been a very important focal point of experimental
endeavours in heavy ion collisions, in the last fifteen years. Simultaneously
theoretical models have been developed to provide information about the
equation of state and reaction mechanisms consistent with the experimental
observables. This article is a review of this endeavour.


title:
Local energy-density functional approach to many-body nuclear systems
  with s-wave pairing

abstract:
  The ground-state properties of superfluid nuclear systems with ^1S_0 pairing
are studied within a local energy-density functional (LEDF) approach. A new
form of the LEDF is proposed with a volume part which fits the Friedman-
Pandharipande and Wiringa-Fiks-Fabrocini equation of state at low and moderate
densities and allows an extrapolation to higher densities preserving causality.
For inhomogeneous systems, a surface term with two free parameters is added. In
addition to the Coulomb direct and exchange interaction energy, an effective
density-dependent Coulomb-nuclear correlation term is included with one more
free parameter, giving a contribution of the same order of magnitude as the
Nolen-Schiffer anomaly in Coulomb displacement energy. The root-mean-square
deviations from experimental masses and radii with the proposed LEDF come out
about a factor of two smaller than those obtained with the conventional
functionals based on the Skyrme or finite-range Gogny force, or on the
relativistic mean-field theory. The generalized variational principle is
formulated leading to the self-consistent Gor'kov equations which are solved
exactly, with physical boundary conditions both for the bound and scattering
states. With a zero-range density-dependent cutoff pairing interaction
incorporating a density-gradient term, the evolution of differential
observables such as odd-even mass differences and staggering in charge radii,
is reproduced reasonably well, including kinks at magic neutron numbers. An
extrapolation to infinite nuclear matter is discussed. We study also the dilute
limit in both the weak and strong coupling regime.


title:
Discontinuities in Relativistic Hydrodynamics Across Space-like and
  Time-like Hypersurfaces

abstract:
  Discontinuities in relativistic hydrodynamics - shock waves and freeze-out
shocks - are considered across both space-like and time-like hypersurfaces. We
analyze the peculiar features of the freeze-out discontinuities and their
connection to the shock-wave phenomena.


title: Antihyperon-Production in Relativistic Heavy Ion Collision

abstract:
  Recently it has been shown that the observed antiproton yield in heavy-ion
collisions at CERN-SpS energies can be understood by multi-pionic interactions
which enforce local chemical equilibrium of the antiprotons with the nucleons
and pions. Here we show that antihyperons are driven towards local chemical
equilibrium with pions, nucleons and kaons on a timescale of less than 3 fm/c
when applying a similar argument for the antihyperons by considering the
inverse channel of annihilation reactions anti-Y + p to pions + kaons. These
multi-mesonic reactions easily explain the antihyperon yields at CERN-SpS
energies as advertised in pure thermal, hadronic models without the need of a
quark gluon plasma phase. In addition, the argument also applies for AGS
energies.


title:
Medium corrections in the formation of light charged particles in heavy
  ion reactions

abstract:
  Within a microscopic statistical description of heavy ion collisions, we
investigate the effect of the medium on the formation of light clusters. The
dominant medium effects are self-energy corrections and Pauli blocking that
produce the Mott effect for composite particles and enhanced reaction rates in
the collision integrals. Microscopic description of composites in the medium
follows the Dyson equation approach combined with the cluster mean-field
expansion. The resulting effective few-body problem is solved within a properly
modified Alt-Grassberger-Sandhas formalism. The results are incorporated in a
Boltzmann-Uehling-Uhlenbeck simulation for heavy ion collisions. The number and
spectra of light charged particles emerging from a heavy ion collision changes
in a significant manner in effect of the medium modification of production and
absorption processes.


title: Dibaryon Systems In SU(3) Chira Quark Model

abstract:
  The possible candidates of $S-$wave dibaryons with various strange numbers
are studied under the chiral SU(3) quark model. It is shown that there are
three types of baryon-baryon bound states. The states of the first type are
called deuteron-like states. If chiral fields can provide enough attraction
between interacting baryons, these systems, such as $[\Xi\Omega -
\Xi^{*}\Omega]_{(1,1/2)}$, $[\Xi\Xi]_{(0,1)}$, $[N \Omega]_{(2,1/2)}$ would be
weakly bound. The states of the second type such as $[\Sigma^{*}
\Delta]_{(0,5/2)}$, $[\Sigma^{*} \Delta]_{(3,1/2)}$, $[\Delta\Delta]_{(0,3)}$
and $[\Delta\Delta]_{(3,0)}$ are named as $\Delta\Delta$-like states. Due to
the highly symmetric character in orbital space, these systems could be
relatively deeply bound, but the strong decay modes of composed baryons cause
the widths of the states much broader. The states of the third type are
entitled as $\Omega\Omega$-like states. Due to the same symmetry character
shown in the systems of the second type and the only weak decay mode of
composed baryons, for instance in $[\Omega\Omega]_{(0,0)}$, or at most one
strong decay mode of composed baryons, for example in
$[\Xi^{*}\Omega]_{(0,1/2)}$, these states are deeply bound states with narrow
widths. The states of latter two types are most interesting new dibaryon states
and should be carefully investigated both theoretically and experimentally.


title: Possible S-wave Dibaryons in SU(3) Chiral Quark Model

abstract:
  In the framework of the SU(3) chiral quark model, the $S-$wave baryon-baryon
bound states are investigated. It is found that according to the symmetry
character of the system and the contributions from chiral fields, there are
three types of bound states. The states of the first type, such as
$[\Omega\Omega]_{(0,0)}$ and $[\Xi^{*}\Omega]_{(0,1/2)}$ are deeply bound
dibaryon with narrow widths. The second type states, $[\Sigma^{*}
\Delta]_{(0,5/2)}$,$[\Sigma^{*} \Delta]_{(3,1/2)}$, $[\Delta\Delta]_{(0,3)}$
and $[\Delta\Delta]_{(3,0)}$ are also bound states, but with broad widths.
$[\Xi\Omega - \Xi^{*}\Omega]_{(1,1/2)}$, $[\Xi\Xi]_{(0,1)}$, and $[N
\Omega]_{(2,1/2)}$ are third type states. They, like {\em d}, are weakly bound
only if the chiral fields can provide attraction between baryons.


title: Medium effects on the flow of strange particles in heavy ion collisions

abstract:
  Strange particles such as the kaon and lambda are useful in probing the
properties of dense matter formed in heavy ion collisions. We review in this
talk the theoretical understandings of their properties in nuclear medium based
on both the effective chiral Lagrangian and the phenomenological hadronic
model. We further review the effects due to changes in their in-medium
properties on their collective flow in heavy ion collisions.


title: Critical Phenomena in Finite Systems

abstract:
  We discuss the dynamics of finite systems within molecular dynamics models.
Signatures of a critical behavior are analyzed and compared to experimental
data both in nucleus-nucleus and metallic cluster collisions. We suggest the
possibility to explore the instability region via tunneling. In this way we can
obtain fragments at very low temperatures and densities. We call these
fragments quantum drops.


title:
Semiempirical Shell Model Masses with Magic Proton Number Z=126 for
  Translead Elements

abstract:
  A highly extrapolatable semiempirical shell model mass equation applicable to
translead elements up to Z=126 is presented. The equation is applied to the
recently discovered superheavy nuclei with Z=118 and A=293 and with Z=114 and
A=289 and their decay products.


title: Low-Spin Spectroscopy of 50Mn

abstract:
  The data on low spin states in the odd-odd nucleus 50Mn investigated with the
50Cr(p,ngamma)50Mn fusion evaporation reaction at the FN-TANDEM accelerator in
Cologne are reported. Shell model and collective rotational model
interpretations of the data are given.


title: Fishing for Narrow Dibaryons in pd->pX Reaction

abstract:
  An analysis of experimental data, obtained at the Linear Accelerator of INR,
is carried out with the aim of searching for supernarrow dibaryons in the
reactions pd->p+X and pd->p+pX_1. Dibaryons with masses 1904\pm 2, 1926\pm 2,
and 1942\pm 2 MeV have been observed in M_{X} missing mass spectra. In M_{X_1}
missing mass spectra, the peaks have been found at M_{X_1}=966\pm 2, 986\pm 2,
and 1003\pm 2 MeV. These values of M_{X_1} coincide with the ones obtained by a
simulation of a decay of the dibaryons into \gamma+pn. The analysis of the data
obtained leads to the conclusion that the observed dibaryons are supernarrow
dibaryons, the decay of which into two nucleons is forbidden by the Pauli
exclusion principle. A possible interpretation of exited nucleon states with
small masses is suggested.


title: Structure of the exotic nucleus $^{14}$B in the ground state

abstract:
  We investigate the structure of the neutron rich nucleus $^{14}$B through
studies of its breakup in the Coulomb field of a heavy target. The breakup
amplitude is calculated within an adiabatic as well as finite range DWBA
theories of breakup reactions. Both these formalisms allow the use of realistic
wave functions for the relative motion between the fragments in the ground
state of the projectile. The longitudinal momentum distributions of $^{13}$B
(ground state) following the breakup of $^{14}$B on a heavy target at beam
energy of 60 MeV/nucleon, calculated using two possible ground state
configurations of $^{14}$B, have been compared with the recent data. The data
seem to favour $^{13}$B(${3\over 2}^-)\otimes2s_{1/2}$ as the possible ground
state configuration of $^{14}$B with a spectroscopic factor close to unity. We
give our predictions for the neutron angular distributions and the relative
energy spectra in the one-neutron removal reaction of $^{14}$B.


title: Bridging the mass gaps at A=5 and A=8 in nucleosynthesis

abstract:
  In nucleosynthesis three possible paths are known to bridge the mass gaps at
A=5 and A=8. The primary path producing the bulk of the carbon in our Universe
proceeds via the triple-alpha process He4(2alpha,gamma)C12. This process takes
place in helium-burning of red giant stars. We show that outside a narrow
window of about 0.5% of the strength or range of the strong force, the stellar
production of carbon or oxygen through the triple-alpha process is reduced by
factors of 30 to 1000. Outside this small window the creation of carbon or
oxygen and therefore also carbon-based life in the universe is strongly
disfavored. The anthropically allowed strengths of the strong force also give
severe constraints for the sum of the light quark masses as well as the Higgs
vacuum expectation value and mass parameter at the 1% level.


title:
Relativistic Hartree-Bogoliubov description of sizes and shapes of A=20
  isobars

abstract:
  Ground-state properties of A = 20 nuclei ($^{20}$N, $^{20}$O, $^{20}$F,
$^{20}$Ne, $^{20}$Na, $^{20}$Mg) are described in the framework of Relativistic
Hartree-Bogoliubov (RHB) theory. The model uses the NL3 effective interaction
in the mean-field Lagrangian, and describes pairing correlations by the pairing
part of the finite range Gogny interaction D1S. Binding energies, quadrupole
deformations, nuclear matter radii, and differences in radii of proton and
neutron distributions are compared with recent experimental data.


title: Quantum Group SU_{q}(2) and Pairing in Nuclei

abstract:
  A scheme for treating the pairing of nucleons in terms of generators of
Quantum Group SU_{q}(2) is presented. The possible applications to nucleon
pairs in a single orbit, multishell case, pairing vibrations and
superconducting nuclei are discussed. The formalism for performing BCS
calculations with q-deformed nucleon pairs is constructed and the role played
by deformation parameter q analyzed in the context of nucleons in a single
orbit and for Sn Isotopes.


title:
The source of elliptic flow and initial conditions for hydrodynamical
  calculations

abstract:
  A model for energy, pressure and flow velocity distributions at the beginning
of relativistic heavy ion collisions is presented, which can be used as initial
condition for hydrodynamical calculations. The results show that QGP forms a
tilted disk, such that the direction of the largest pressure gradient stays in
the reaction plane, but deviates from both the beam and the usual transverse
flow directions. Such initial condition may lead to the creation of "antiflow"
or "third flow component".


title: Quasi-SU(3) truncation scheme for even-even sd-shell nuclei

abstract:
  The Quasi-SU(3) symmetry was uncovered in full pf and sdg shell-model
calculations for both even-even and odd-even nuclei. It manifests itself
through a dominance of single-particle and quadrupole-quadrupole terms in the
Hamiltonian used to describe well-deformed nuclei. A practical consequence of
the quasi-SU(3) symmetry is an efficient basis truncation scheme. In a recent
work was shown that when this type of Hamiltonian is diagonalized in an SU(3)
basis, only a few irreducible represntations (irreps) of SU(3) are needed to
describe the Yrast band, the leading S = 0 irrep augmented with the leading S =
1 irreps in the proton and neutron subspaces. In the present article the
quasi-SU(3) truncation scheme is used, in conjunction with a "realistic but
schematic" Hamiltonian that includes the most important multipole terms, to
describe the energy spectra and B(E2) transition strengths of 20-Ne, 22-Ne,
24-Mg and 28-Si. The effect of the size of the Hilbert space on both sets of
observables is discussed, as well as the structure of the Yrast band and the
importance of the various terms in the Hamiltonian.


title: Pseudo SU(3) shell model: Normal parity bands in odd-mass nuclei

abstract:
  A pseudo shell SU(3) model description of normal parity bands in 159-Tb is
presented. The Hamiltonian includes spherical Nilsson single-particle energies,
the quadrupole-quadrupole and pairing interactions, as well as three rotor
terms. A systematic parametrization is introduced, accompained by a detailed
discussion of the effect each term in the Hamiltonian has on the energy
spectrum. Yrast and excited band wavefunctions are analyzed together with their
B(E2) values.


title: Strong and electromagnetic interaction views on deuteron structure

abstract:
  The purpose of this contribution is to give an outlook of recent results
connected with deuteron physics, with electromagnetic and strong interacting
probes at intermediate energy. Special attention will be devoted to
polarization observables.


title: Uncertainties in the eta-Nucleon Scattering Length and Effective Range

abstract:
  The coupled eta-N, pi-N, gamma-N system is described by a K-matrix method.
The parameters in this model are adjusted to get an optimal fit to pi-N --->pi-
N$, pi-N --->eta-N$, gamma-N--->pi-N and gamma-N --->eta-N data in an energy
range of about 100MeV or so each side of the eta threshold. The outcome is the
appearance of two solutions one which has an eta-nucleon scattering length (a)
of about 1.0 fm and a second with a~0.2fm. However, the second solution has an
unconventional non-Lorentian form for the T-matrix in the region of the
1535(20)MeV and 1650(30)MeV S-wave pi-N resonances.


title: Neutral weak currents in pion electroproduction on the nucleon

abstract:
  Parity violating asymmetry in inclusive scattering of longitudinally
polarized electrons by unpolarized protons with $\pi^0$ or $\pi^+$ meson
production, is calculated as a function of the momentum transfer squared $Q^2$
and the total energy $W$ of the $\pi N$-system. This asymmetry, which is
induced by the interference of the one-photon exchange amplitude with the
parity-odd part of the $Z^0$-exchange amplitude, is calculated for the
$\gamma^*(Z^*)+p\to N+\pi$ processes ($\gamma^*$ is a virtual photon and $Z^*$
a virtual Z-boson) considering the $\Delta$-contribution in the $s-$channel,
the standard Born contributions and vector meson ($\rho$ and $\omega$)
exchanges in the $t-$channel. Taking into account the known isotopic properties
of the hadron electromagnetic and neutral currents, we show that the P-odd term
is the sum of two contributions. The main term is model independent and it can
be calculated exactly in terms of fundamental constants. It is found to be
linear in $Q^2$. The second term is a relatively small correction which is
determined by the isoscalar component of the electromagnetic current. Near
threshold and in the $\Delta$-region, this isoscalar part is much smaller (in
absolute value) than the isovector one: its contribution to the asymmetry
depend on the polarization state (longitudinal or transverse) of the virtual
photon.


title: The nuclear force in the third millennium

abstract:
  I will review recent progress in our understanding of the nuclear force. In
the course of the 1990's, so-called high-precision, charge-dependent
nucleon-nucleon potentials have been constructed which are, essentially,
phenomenological models. These potentials are now commonly used as input for
exact few-body calculations and microscopic nuclear many-body theory. I will
critically analyses those models and point out their strenghts and weaknesses.
Particular emphasis will be on charge dependence. Other recent research was
conducted on a more basic level: understanding the nuclear force in terms of
the fundamental theory of strong interactions, QCD. Predictions from this
sector are typically qualitative in nature. Thus, the main problem of the
current status in the field is that quantitative models for the nuclear force
have a poor theoretical background, while theory based models yield poor
results. The chief challenge for the new millenium is to overcome this
discrepancy. Chiral effective field theory may be a suitable tool to solve the
problem.


title: Quasideuteron configurations in 46V and 58Cu

abstract:
  The data on low spin states in the odd-odd nuclei 46V and 58Cu investigated
with the 46Ti(p,ngamma)46V, 32S(16O,pn)46V and 58Ni(p,ngamma)58Cu reactions at
the FN-TANDEM accelerator in Cologne are reported. The states containing large
quasideuteron components are identified from the strong isovector M1
transitions, from shell model calculations and from experimental data for
low-lying states.


title: Pygmy dipole resonances in relativistic random phase approximation

abstract:
  The isovector dipole response in $^{208}$Pb is described in the framework of
a fully self-consistent relativistic random phase approximation. The NL3
parameter set for the effective mean-field Lagrangian with nonlinear meson
self-interaction terms, used in the present calculations, reproduces ground
state properties as well as the excitation energies of giant resonances in
nuclei. In addition to the isovector dipole resonance in $^{208}$Pb, the
present analysis predicts the occurrence of low-lying E1 peaks in the energy
region between 7 and 11 MeV. In particular, a collective state has been
identified whose dynamics correspond to that of a dipole pygmy resonance: the
vibration of the excess neutrons against the inert core composed of equal
number of protons and neutrons.


title: Effective Field Theory with Two and Three Nucleons

abstract:
  Progress in the Effective Field Theory of two and three nucleon systems is
sketched, concentrating on the low energy version in which pions are integrated
out as explicit degrees of freedom. Examples given are calculations of deuteron
Compton scattering, three body forces and the triton, and nd partial waves.


title: A Tale of Two and Three Bodies

abstract:
  This presentation is a concise teaser for the Effective Field Theory (EFT) of
two and three nucleon systems as it emerged in the last three years, using a
lot of words and figures, and a few cheats.


title: Perturbative Pions in Deuteron Compton Scattering and Three Body Physics

abstract:
  Elastic deuteron Compton scattering and the quartet S wave of nd scattering
are investigated in the effective field theory of nuclear physics with
perturbative pions. Convergence and aggreement with experiment are good.


title: On the Strength of Spin-Isospin Transitions in A=28 Nuclei

abstract:
  The relations between the strengths of spin-isospin transition operators
extracted from direct nuclear reactions, magnetic scattering of electrons and
processes of semi-leptonic weak interactions are discussed.


title: $\pi \Delta\Delta$ coupling constant

abstract:
  We calculate the $\pi \Delta\Delta$ coupling
$g_{\pi^0\Delta^{++}\Delta^{++}}$ using light cone QCD sum rule. Our result is
$g_{\pi^0\Delta^{++}\Delta^{++}}=(11.8\pm 2.0)$.


title: Will Strangeness Win the Prize?

abstract:
  Five groups have made predictions involving the production of strange hadrons
and entered them in a competition set up by Barbara Jacak, Xin-Nian Wang and
myself in the spring of 1998 for the purpose of comparing to first year physics
results from RHIC. These predictions are summarized and evaluated.


title: Continuum QCD and light mesons

abstract:
  The ladder-rainbow truncation of the set of Dyson-Schwinger equations is used
to study light mesons. The parameters in the effective interaction are
constrained by the chiral condensate and f_\pi; the current quark masses are
fitted to m_\pi and m_K. The dressed quark propagators are in qualitative
agreement with recent lattice-QCD results at low q^2 while having the correct
perturbative behavior at large q^2. The resulting vector meson masses are
within 5% of the experimental values. The obtained electromagnetic form factors
and strong and electroweak coupling constants are also in good agreement with
the data. At finite temperature, this truncation leads to a mean-field chiral
phase transition. The spatial pion mass is almost constant below this
transition, but rises with T close to and above T_c. The mass of its chiral
partner, an idealized sigma meson, decreases with T until T_c, where it becomes
degenerate with the pion.


title: Rare isotope production in statistical multifragmentation

abstract:
  Producing rare isotopes through statistical multifragmentation is
investigated using the Mekjian method for exact solutions of the canonical
ensemble. Both the initial fragmentation and the the sequential decay are
modeled in such a way as to avoid Monte Carlo and thus provide yields for
arbitrarily scarce fragments. The importance of sequential decay, exact
particle-number conservation and the sensitivities to parameters such as
density and temperature are explored. Recent measurements of isotope ratios
from the fragmentation of different Sn isotopes are interpreted within this
picture.


title: The hep reaction and the solar neutrino problem

abstract:
  The results of a new calculation of the astrophysical S-factor for the proton
weak capture on 3He are here reviewed. The methods used to obtain very accurate
initial and final state wave functions and to construct the nuclear weak
current operator are described. Finally the implications of these results for
the Super-Kamiokande solar neutrino data are discussed.