title: Compatibility of QCD sum-rules and Hadron field theory in a dense medium

abstract:
  The compatibility of the QCD sum rules and effective hadronic models
predictions are examined. For this purpose we have considered the results for
the nucleon self-energy in a dense hadronic environment provided by two
independent QCD sum-rules calculations. They are immersed in a theory of
hadronic fields giving rise to non-linear interactions, whose vertices are
parameterized in different ways. Although all of them reproduce the self-energy
used as input, very different descriptions of nuclear observables are obtained.
Only under very definite circumstances we have found an acceptable agreement
with the nuclear matter properties. To achieve this, phenomenological
parameters are not required at all.


title: Magnetic moments of the 2${^+_1}$ states around $^{132}$Sn

abstract:
  Development of neutron-rich radioactive beams at the HRIBF facility has
stimulated experimental and theoretical activity in heavy Sn and Te isotopes.
Recently, the g-factor of the first 2$^+$ state in $^{132}$Te has been
measured. We report here new shell-model calculation of magnetic moments for
selected Sn and Te isotopes. The residual interaction is based on the CD-Bonn
renormalized $ G $-matrix. Single-particle spin and orbital effective g-factors
are evaluated microscopically including core polarization and meson exchange
currents effects.


title:
Superscaling, Scaling Functions and Nucleon Momentum Distributions in
  Nuclei

abstract:
  The scaling functions $f(\psi')$ and $F(y)$ from the $\psi'$- and $y$-scaling
analyses of inclusive electron scattering from nuclei are explored within the
coherent density fluctuation model (CDFM). In addition to the CDFM formulation
in which the local density distribution is used, we introduce a new equivalent
formulation of the CDFM based on the one-body nucleon momentum distribution
(NMD). Special attention is paid to the different ways in which the excitation
energy of the residual system is taken into account in $y$- and
$\psi'$-scaling. Both functions, $f(\psi')$ and $F(y)$, are calculated using
different NMD's and are compared with the experimental data for a wide range of
nuclei. The good description of the data for $y < 0$ and $\psi' < 0$ (including
$\psi'< -1$) makes it possible to show the sensitivity of the calculated
scaling functions to the peculiarities of the NMD's in different regions of
momenta. It is concluded that the existing data on the $\psi'$- and $y$-scaling
are informative for the NMD's at momenta not larger than $2.0 \div 2.5$
fm$^{-1}$. The CDFM allows us to study simultaneously on the same footing the
role of both basic quantities, the momentum and density distributions, for the
description of scaling and superscaling phenomena in nuclei.


title: Spin Alignment of Vector Mesons in Non-central A+A Collisions

abstract:
  We discuss the consequence of global polarization of the produced quarks in
non-central heavy-ion collisions on the spin alignment of vector mesons. We
show that the alignment is quite different for different hadronization
scenarios. These results can be tested directly by measuring the vector mesons'
alignment through angular distributions of the decay products with respect to
the reaction plane. Such angular distributions will give rise to azimuthal
anisotropy $v_2$ of the decay products in the collision frame. Constraints
provided by the data on the azimuthal anisotropy of hadron spectra at RHIC
points to a quark recombination scenario of hadronization.


title: Parity nonconserving observables in thermal neutron capture on a proton

abstract:
  We calculate parity nonconserving observables in the processes where a
neutron is captured on a proton at the threshold energy radiating a photon.
Various potential models such as Paris, Bonn and Argonne $v18$ are used for the
strong interactions, and the meson-exchange description is employed for the
weak interactions between hadrons. The photon polarization $P_\gamma$ in the
unpolarized neutron capture process and photon asymmetry $A_\gamma$ in the
polarized neutron capture process are obtained in terms of the weak
meson-nucleon coupling constants. $A_\gamma$ turns out to be basically
insensitive to the employed strong interaction models and thus can be uniquely
determined in terms of the weak coupling constants, but $P_\gamma$ depends
significantly on the strong interaction models.


title:
A quark meson coupling model with density- and temperature- dependent
  quark masses

abstract:
  Based on the quark mass density- and temperature- dependent model we suggest
a model for nuclear matter where the meson field is introduced to be directly
coupled to the quarks. The dynamic formation of the nucleon bag, the saturation
properties of nuclear matter as well as equation of state for this model are
studies.


title:
Sigma Exchange in the Nonmesonic Decays of Light Hypernuclei and
  Violation of the Delta I=1/2 Rule

abstract:
  Nonmesonic weak decays of s-shell hypernuclei are analyzed in microscopic
models for the Lambda N to NN weak interaction. A scalar-isoscalar meson,
sigma, is introduced and its importance in accounting the decay rates, n/p
ratios and proton asymmetry is demonstrated. Possible violation of the Delta
I=1/2 rule in the nonmesonic weak decay of Lambda is discussed in a
phenomenological analysis and several useful constraints are presented. The
microscopic calculation shows that the current experimental data indicate a
large violation of the Delta I=1/2 rule, although no definite conclusion can be
derived due to large ambiguity of the decay rate of {^4_Lambda H}.


title:
Inclusion of non-spherical components of the Pauli blocking operator in
  (p,p') reactions

abstract:
  We present the first calculations of proton elastic and inelastic scattering
in which the Pauli blocking operator contains the leading non-spherical
components as well as the usual spherical (angle-averaged) part. We develop a
formalism for including the contributions to the effective nucleon-nucleon
interaction from the resulting new G-matrix elements that extend the usual
two-nucleon spin structure and may not conserve angular momentum. We explore
the consequences of parity conservation, time reversal invariance, and
nucleon-nucleon antisymmetrization for the new effective interaction. Changes
to the calculated cross section and spin observables are small in the energy
range from 100 to 200 MeV.


title:
Spin observables for pion photoproduction on the deuteron in the
  $\Delta$(1232)-resonance region

abstract:
  Spin observables for the three charge states of the pion for the pion
photoproduction reaction on the deuteron, $\gamma d\to\pi NN$, with polarized
photon beam and/or oriented deuteron target are predicted. For the beam-target
double-spin asymmetries, it is found that only the longitudinal asymmetries
$T_{20}^{\ell}$ and $T_{2\pm 2}^{\ell}$ do not vanish, whereas all the circular
and the other longitudinal asymmetries do vanish. The sensitivity of spin
observables to the model deuteron wave function is investigated. It has been
found that only $T_{21}$ and $T_{22}$ are sensitive to the model deuteron wave
function, in particular in the case of $\pi^0$-production above the
$\Delta$-region, and that other asymmetries are not.


title:
Hyperons in a relativistic mean-field approach to asymmetric nuclear
  matter

abstract:
  Relativistic mean-field theory with $\delta$ meson, nonlinear isoscalar
self-interactions and isoscalar-isovector cross interaction terms with
parametrizations obtained to reproduce Dirac-Brueckner-Hartree-Fock
calculations for nuclear matter is used to study asymmetric nuclear matter
properties in $\beta$-equilibrium, including hyperon degrees of freedom and
(hidden) strange mesons. Influence of cross interaction on composition of
hyperon matter and electron chemical potential is examined. Softening of
nuclear equation of state by the cross interactions results in lowering of
hyperonization, although simultaneously enhancing a hyperon-induced decrease of
the electron chemical potential, thus indicating further shift of a kaon
condensate occurence to higher densities.


title:
Consideration of Nuclear Forces from the Viewpoint of the
  Renormalization Group - Relation of Nuclear Forces between Phenomenological
  Approach and Nuclear Effective Field Theory -

abstract:
  A relation between nuclear forces derived using a phenomenological approach
and nuclear effective field theory (NEFT) is proposed from a renormalization
group point of view. A phenomenological nuclear force (V_ph) and an NEFT-based
NN-potential (V_EFT) are satisfactorily related to each other through the
Wilsonian renormalization group (WRG) method. It is clearly shown that use of
the simple contact interactions in NEFT is adequate to simulate small scale
phenomena, and that an NEFT-based NN-potential (V_EFT) is free from dependence
on the model used to describe small scale phenomena. We study the
characteristics of V_EFT from a WRG point of view, emphasizing points that have
not previously been fully recognized. We also use the V_{low k} method and a
unitary transformation method to relate V_ph to V_EFT. It is found that they
are not appropriate for this purpose.


title: Explanation of more effective effective field theory

abstract:
  We show that the so-called more effective effective field theory (MEEFT) is
essentially equivalent to the proper nuclear effective field theory (NEFT) in
describing low-energy electroweak processes in nuclei. A key to understanding
their equivalence is the relation between a NEFT-based NN-potential and a
phenomenological potential through the Wilsonian renormalization group
equation.We also discuss an important advantage of MEEFT.


title: A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions

abstract:
  We describe in detail how the different components of a multi-phase transport
(AMPT) model, that uses the Heavy Ion Jet Interaction Generator (HIJING) for
generating the initial conditions, Zhang's Parton Cascade (ZPC) for modeling
partonic scatterings, the Lund string fragmentation model or a quark
coalescence model for hadronization, and A Relativistic Transport (ART) model
for treating hadronic scatterings, are improved and combined to give a coherent
description of the dynamics of relativistic heavy ion collisions. We also
explain the way parameters in the model are determined, and discuss the
sensitivity of predicted results to physical input in the model. Comparisons of
these results to experimental data, mainly from heavy ion collisions at the
Relativistic Heavy Ion Collider (RHIC), are then made in order to extract
information on the properties of the hot dense matter formed in these
collisions.


title: Photon and nucleon induced production of Theta^+

abstract:
  We investigate Theta^+ production via photon and nucleon induced reactions.
We observe that the positive parity Theta^+ production provides about ten times
larger total cross sections than those of the negative parity one in both
photon and nucleon induced reactions due to P-wave enhancement of the K-N-Theta
vertex. We also consider the model independent method in the nucleon induced
reaction to determine the parity of Theta^+ and show clearly distinguishable
signals for the two parities.


title: $\Delta$-scaling and heat capacity in relativistic ion collisions

abstract:
  The $\Delta$-scaling method has been applied to the total multiplicity
distribution of the relativistic ion collisions of p+p, C+C and Pb+Pb which
were simulated by a Monte Carlo package, LUCIAE 3.0. It is found that the
$\Delta$-scaling parameter decreases with the increasing of the system size.
Moreover, the heat capacities of different mesons and baryons have been
extracted from the event-by-event temperature fluctuation in the region of low
transverse mass and they show the dropping trend with the increasing of impact
parameter.


title:
Parity and spin of the $\Theta^+$ pentaquark in the $NN\to Y\Theta^+$
  reaction at the threshold

abstract:
  Spin observables of a binary reaction $1+2\to 3+4$ are discussed at the
threshold in general form using P-parity and angular momentum conservation.
General formulae for polarization transfer, spin-spin correlation parameters in
the initial and final states and induced tensor polarization are derived for
arbitrary spins of participating particles. This formalism is worked out in
detail for the $NN\to Y\Theta^+$ reaction. Assuming that the spin of the
pentaquark $\Theta^+$ takes the values 1/2, 3/2 and 5/2, whereas the spin of
the hyperon $Y$ equals 1/2, explicite formulae are obtained for the observables
in terms of few non-vanishing at the threshold spin amplitudes separately for
the spin-singlet and spin-triplet initial NN states. In case of all particles
in the $NN\to Y\Theta^+$ reaction have the spin-1/2 a full spin-structure for
totally polarized cross sections is derived. Some of the obtained spin
observables strongly depend on the intrinsic P-parity of the $\Theta^+$ and the
total isospin of the reaction. Therefore, a measurement of these observables
allows one to determine the P-parity of the pentaquark $\Theta^+$ in a model
independent way for any spin of the $\Theta^+$.


title: $Nd\to{^3H}\gamma$ with Effective Field Theory

abstract:
  The cross section of neutron-deuteron radiative capture $n d\to {^3H}\gamma$
is calculated at energies relevant to Big-Bang nucleosynthesis ($ 20 \leq E
\leq 200 $ Kev) with pionless Effective Field Theory. At these energies,
magnetic transition M1 gives the dominant contribution. The M1 amplitude is
calculated up to next-to-next-to leading order(N$^2$LO) with insertion of
three-body force. Results are in good agreement within few percent theoretical
uncertainty in comparison with available calculated data below E=200 Kev.


title: Nuclear symmetry energy: from nuclear extremes to neutron-star matter

abstract:
  Extrapolations from nuclei to neutron stars hinge on the symmetry term in
nuclear binding formulas. The term describes reduction in the binding
associated with neutron-proton (np) imbalance. Regrettably, binding formulas in
the literature commonly lack an intrinsic consistency with regard to the
symmetry term. Our elementary considerations determine the universal
macroscopic limit for the term and predict its weakening in light nuclei due to
emergence of the nuclear asymmetry-skin. Experimental systematic of
isobaric-analogue states allows for a determination of the volume and surface
coefficients within the macroscopic limit of the symmetry term, disregarding
any reminder of a binding formula. The results are next exploited to constrain
the dependence of symmetry energy on nuclear density, essential for the
neutron-star predictions.


title:
Particle Number Fluctuations in Statistical Model with Exact Charge
  Conservation Laws

abstract:
  Even though the first momenta i.e. the ensemble average quantities in
canonical ensemble (CE) give the grand canonical (GC) results in large
multiplicity limit, the fluctuations involving second moments do not respect
this asymptotic behaviour. Instead, the asymptotics are strikingly different,
giving a new handle in study of statistical particle number fluctuations in
relativistic nuclear reactions. Here we study the analytical large volume
asymptotics to general case of multispecies hadron gas carrying fixed baryon
number, strangeness and electric charge. By means of Monte Carlo simulations we
have also studied the general multiplicity probability distributions taking
into account the decay chains of resonance states.


title:
Anisotropic flow of charged and identified hadrons in the quark-gluon
  string model for Au+Au collisions at sqrt(s) = 200 GeV

abstract:
  The pseudorapidity behaviour of the azimuthal anisotropy parameters v_1 and
v_2 of inclusive charged hadrons and their dependence on the centrality has
been studied in Au+Au collisions at full RHIC energy of sqrt(s) = 200 GeV
within the microscopic quark-gluon string model. The QGSM simulation results
for the directed flow v_1 show antiflow alignment within the pseudorapidity
range |eta| < 2 in a fair agreement with the experimental v_1(eta) data, but
cannot reproduce the further development of the antiflow up to |eta| around
3.5. The eta dependence of the elliptic flow v_2 extracted from the simulations
agrees well with the experimental data in the whole pseudorapidity range for
different centrality classes. The centrality dependence of the integrated
elliptic flow of charged hadrons in the QGSM almost coincides with the PHOBOS
experimental distribution. The transverse momentum dependence of the elliptic
flow of identified and inclusive charged hadrons is studied also. The model
reproduces quantitatively the low p_T part of the distributions rather good,
but underestimates the measured elliptic flow for transverse momenta p_T > 1
GeV/c. Qualitatively, however, the model is able to reproduce the saturation of
the v_2(p_T) spectra with rising p_T as well as the crossing of the elliptic
flow for mesons and baryons.


title: Microcanonical studies on isoscaling

abstract:
  The exponential scaling of isotopic yields is investigated for sources of
different sizes over a broad range of excitation energies and freeze-out
volumes, in both primary and asymptotic stages of the decay in the framework of
a microcanonical multifragmentation model. It was found that the scaling
parameters have a strong dependence on the considered pair of equilibrated
sources and excitation energy and are affected by the secondary particle
emission of the break-up fragments. No significant influence of the freeze-out
volume on the considered isotopic ratios has been observed. Deviations of
microcanonical results from grandcanonical expectations are discussed.


title: Theta^+ baryon production from gamma N and NN scattering

abstract:
  We investigate Theta^+ production via gamma N and NN reactions in order to
obtain information on the structure of Theta^+, especially its parity. We
observe that the positive parity. Theta^+production provides about ten times
total cross sections than those of the negative parity one in both photon and
nucleon induced reactions due to P-wave enhancement of the KNTheta vertex. We
also consider the model independent method in the nucleon induced reaction to
determine the parity of Theta^+ and show clearly distinguishable signals for
the two parities.


title: Tensor coupling and pseudospin symmetry in nuclei

abstract:
  In this work we study the contribution of the isoscalar tensor coupling to
the realization of pseudospin symmetry in nuclei. Using realistic values for
the tensor coupling strength, we show that this coupling reduces noticeably the
pseudospin splittings, especially for single-particle levels near the Fermi
surface. By using an energy decomposition of the pseudospin energy splittings,
we show that the changes in these splittings come by mainly through the changes
induced in the lower radial wave function for the low-lying pseudospin
partners, and by changes in the expectation value of the pseudospin-orbit
coupling term for surface partners. This allows us to confirm the conclusion
already reached in previous studies, namely that the pseudospin symmetry in
nuclei is of a dynamical nature.


title: Recent results in CBF theory for medium-heavy nuclei

abstract:
  We extend the correlated basis functions theory (CBF) for nuclei with
different number of protons and neutrons and in j-j coupling scheme. By means
of the Fermi hypernetted chain integral equations, in conjunction with the
single operator chain approximation (FHNC/SOC), we evaluate the ground state
and the one-body densities for 40Ca, 48Ca and 208Pb nuclei. The realistic
Argonne V8' two-nucleon potentials has been used. We compare the ground-state
properties of these nuclei calculated by using correlation functions with and
without tensor components.


title: Nuclear density functional constrained by low-energy QCD

abstract:
  We have developed a relativistic point-coupling model of nuclear many-body
dynamics constrained by the low-energy sector of QCD. The effective Lagrangian
is characterized by density-dependent coupling strengths determined by chiral
one- and two-pion exchange (with single and double delta isobar excitations)
and by large isoscalar background fields that arise through changes of the
quark condensate and the quark density at finite baryon density. The model has
been tested in the analysis of nuclear ground-state properties along different
isotope chains of medium and heavy nuclei. The agreement with experimental data
is comparable with purely phenomenological predictions. The built-in QCD
constraints and the explicit treatment of pion exchange restrict the freedom in
adjusting parameters and functional forms of density-dependent couplings. It is
shown that chiral pionic fluctuations play an important role for nuclear
binding and saturation mechanism, whereas background fields of about equal
magnitude and opposite sign generate the effective spin-orbit potential in
nuclei.


title: Chemical equilibrium study at SPS 158A GeV

abstract:
  A detailed study of chemical freeze-out in nucleus-nucleus collisions at beam
energy 158A GeV is presented. By analyzing hadronic multiplicities within the
statistical hadronization approach, the chemical equilibration of p-p, C-C,
Si-Si and Pb-Pb systems is studied as a function of the number of participating
nucleons in the system. Additionally, Two Component statistical hadronization
model is applied to the data and is found to be able to explain the observed
strangeness hadronic phase space under-saturation.


title: Nuclear Physics with electroweak probes

abstract:
  The last few years activity of the Italian community concerning nuclear
physics with electroweak probes is reviewed.Inclusive quasi-elastic
electron-scattering, photon end electron induced one- and two-nucleon emission
are considered. The scattering of neutrinos off nuclei in the quasi-elastic
region is also discussed.


title: Canonical Strangeness and Distillation Effects in Hadron Production

abstract:
  Strangeness canonical ensemble for Maxwell-Boltzmann statistics is
reconsidered for excited nuclear systems with non-vanishing net strangeness. A
new recurrence relation method is applied to find the partition function. The
method is first generalized to the case of quantum strangeness canonical
ensemble. Uncertainties in calculation of the K+/pi+ excitation function are
discussed. A new scenario based on the strangeness distillation effect is put
forward for a possible explanation of anomalous strangeness production observed
at the bombarding energy near 30 AGeV. The peaked maximum in the K+/pi+ ratio
is considered as a sign of the critical end-point reached in evolution of the
system rather than a latent heat jump emerging from the onset of the first
order deconfinement phase transition.


title: Different formulations of 3He and 3H photodisintegration

abstract:
  Different momentum space Faddeev-like equations and their solutions for the
radiative pd-capture and the three-nucleon photodisintegration of 3He are
presented. Applications are based on the AV18 nucleon-nucleon and the Urbana IX
three nucleon forces. Meson exchange currents are included using the Siegert
theorem. A very good agreement has been found in all cases indicating the
reliability of the used numerical methods. Predictions for cross sections and
polarization observables in the pd-capture and the complete three nucleon
breakup of 3He at different incoming deuteron/photon energies are presented.


title: Neutron matter on the lattice with pionless effective field theory

abstract:
  We study neutron matter by combining pionless effective field theory with
non-perturbative lattice methods. The neutron contact interaction is determined
by zero temperature scattering data. We simulate neutron matter on the lattice
at temperatures 4 and 8 MeV and densities below one-fifth normal nuclear matter
density. Our results at different lattice spacings agree with one another and
match bubble chain calculations at low densities. The equation of state of pure
neutron matter obtained from our simulations agrees quantitatively with
variational calculations based on realistic potentials.


title: Effective Field Theory and Isospin Violation in Few-Nucleon Systems

abstract:
  I discuss the leading and subleading isospin--breaking three--nucleon forces
in the chiral effective field theory framework.


title: Effective operators within the ab initio no-core shell model

abstract:
  We implement an effective operator formalism for general one- and two-body
operators, obtaining results consistent with the no-core shell model (NCSM)
wave functions. The Argonne V8' nucleon-nucleon potential was used in order to
obtain realistic wave functions for 4He, 6Li and 12C. In the NCSM formalism, we
compute electromagnetic properties using the two-body cluster approximation for
the effective operators and obtain results which are sensitive to the range of
the bare operator. To illuminate the dependence on the range, we employ a
Gaussian two-body operator of variable range, finding weak renormalization of
long range operators (e.g., quadrupole) in a fixed model space. This is
understood in terms of the two-body cluster approximation which accounts mainly
for short-range correlations. Consequently, short range operators, such as the
relative kinetic energy, will be well renormalized in the two-body cluster
approximation.


title: Early Thermalization at RHIC

abstract:
  Triple-gluon elastic scatterings are briefly reviewed since the scatterings
explain the early thermalization puzzle in Au-Au collisions at RHIC energies. A
numerical solution of the transport equation with the triple-gluon elastic
scatterings demonstrates gluon momentum isotropy achieved at a time of the
order of 0.65 fm/c. Triple-gluon scatterings lead to a short thermalization
time of gluon matter.


title:
Combined nonrelativistic constituent quark model and heavy quark
  effective theory study of semileptonic decays of \Lambda_b and \Xi_b baryons

abstract:
  We present the results of a nonrelativistic constituent quark model study of
the semileptonic decays $\Lambda_b^0 \to \Lambda_c^+ l^- {\bar \nu}_l$ and
$\Xi_b^0 \to \Xi_c^+ l^- {\bar \nu}_l$. We work on coordinate space, with
baryon wave functions recently obtained from a variational approach based on
heavy quark symmetry . We develop a novel expansion of the electroweak current
operator, which supplemented with heavy quark effective theory constraints,
allows us to predict the baryon form factors and the decay distributions for
all $q^2$ (or equivalently $w$) values accessible in the physical decays. Our
results for the partially integrated longitudinal and transverse decay widths,
in the vicinity of the $w=1$ point, are in excellent agreement with lattice
calculations. Comparison of our integrated $\Lambda_b-$decay width to
experiment allows us to extract the $V_{cb}$ Cabbibo-Kobayashi-Maskawa matrix
element for which we obtain a value of $|V_{cb}| = 0.040\pm 0.005 ({\rm stat})
^{+0.001}_{-0.002} ({\rm theory})$ also in excellent agreement with a recent
determination by the DELPHI Collaboration from the exclusive ${\bar {\rm
B}^0_{\rm d}} \to {\rm D}^{*+}l^-{\bar \nu}_l$ decay. Besides for the
$\Lambda_b (\Xi_b)-$decay, the longitudinal and transverse asymmetries, and the
longitudinal to transverse decay ratio are $<a_L >=-0.954\pm 0.001 (-0.945\pm
0.002)$, $<a_T >=-0.665\pm 0.002 (-0.628\pm 0.004)$ and $R_{L/T}=1.63\pm 0.02
(1.53\pm 0.04)$, respectively.


title: Net Charge and Isospin Fluctuations in the World of Elementary Particles

abstract:
  Charge and isospin event-by-event fluctuations in high-energy pp-collisions
are predicted within the Unitary Eikonal Model ({\bf UEM}), in particular the
fluctuation patterns of the ratios of charged-to-charged and neutral-to-charged
pions. These fluctuations are found to be sensitive to the presence of unstable
resonances, such as $\rho $ and $\omega $ mesons.We predict that the
charge-fluctuation observable $D_{UEM}$ should be restricted to the interval
$8/3\le D_{UEM}\le 4$ depending on the $\rho /\pi $ production ratio.This
result is shown to be compatible with the formation of a hadron gas at RHIC and
SPS energies.


title:
Some electromagnetic properties of the nucleon from Relativistic Chiral
  Effective Field Theory

abstract:
  Considering the magnetic moment and polarizabilities of the nucleon we
emphasize the need for relativistic chiral EFT calculations. Our relativistic
calculations are done via the forward-Compton-scattering sum rules, thus
ensuring the correct analytic properties. The results obtained in this way are
equivalent to the usual loop calculations, provided no heavy-baryon expansion
or any other manipulations which lead to a different analytic structure (e.g.,
infrared regularization) are made. The Baldin sum rule can directly be applied
to calculate the sum of nucleon polarizabilities. In contrast, the GDH sum rule
is practically unsuitable for calculating the magnetic moments. The
breakthrough is achieved by taking the derivatives of the sum rule with respect
to the anomalous magnetic moment. As an example, we apply the derivative of the
GDH sum rule to the calculation of the magnetic moment in QED and reproduce the
famous Schwinger's correction from a tree-level cross-section calcualation. As
far as the nucleon properties are concerned, we focus on two issues: 1) chiral
behavior of the nucleon magnetic moment and 2) reconciliation of the chiral
loop and $\Delta$-resonance contributions to the nucleon magnetic
polarizability.


title:
Magnetic Properties of Precession Modes Built on High-K
  Multi-quasiparticle States in ^{178}W

abstract:
  We present an example that shows that the random phase approximation
performed on high-K multi-quasiparticle configurations leads to a rotor picture
by calculating excitation energies and magnetic properties of ^{178}W. Then we
deduce the effective g_R of the high-K rotors and compare it with that of the
low-K one.


title:
Relativistic continuum-continuum coupling in the dissociation of halo
  nuclei

abstract:
  A relativistic coupled-channels theory for the calculation of dissociation
cross sections of halo nuclei is developed. A comparison with non-relativistic
models is done for the dissociation of $^{8}$B projectiles. It is shown that
neglecting relativistic effects leads to seizable inaccuracies in the
extraction of the astrophysical S-factor for the proton+beryllium radiative
capture reaction.


title:
^{1}S_{0} proton superfluidity in neutron star matter: Impact of bulk
  properties

abstract:
  We study the ^{1}S_{0} proton pairing gap in neutron star matter putting
emphasis on influence of the Dirac effective mass and the proton fraction on
the gap within the relativistic Hartree-Bogoliubov model. The gap equation is
solved using the Bonn-B potential as a particle-particle channel interaction.
It is found that the maximal pairing gap \Delta_{max} is 1-2 MeV, which has a
strong correlation with the Dirac effective mass. Hence we suggest that it
serves as a guide to narrow down parameter sets of the relativistic effective
field theory. Furthermore, the more slowly protons increase with density in the
core region of neutron stars, the wider the superfluid range and the slightly
lower the peak of the gap become.


title:
Quantum tunneling of a complex systems: effects of finite size and
  intrinsic structure

abstract:
  A simple model is considered to study the effects of finite size and internal
structure in the tunneling of bound two-body systems through a potential
barrier. It is demonstrated that these effects are able to increase the
tunneling probability. Applications may include nuclear fusion,hydrogen atom
and Cooper pair tunneling.


title:
Rapidity Spectra of the Secondaries Produced in Heavy Ion Collisions and
  the Constituent Picture of the Particles

abstract:
  The present study is both a reanalysis and an extension of the approach
initiated by Eremin and Voloshin(referenced in the text). We attempt to
interpret here the rapidity-spectra of the various particles produced in both
$Pb+Pb$ and $Au+Au$ collisions at CERN-SPS and RHIC-BNL. The study made here is
wider in scope and is more species-specific than the earlier ones for which the
results obtained here have been compared with those suggested by some previous
works based on HIJING, VENUS etc, at various centralities. The study reconfirms
that the constituent parton picture of the particles provides a better and more
unified description of the rapidity-density yields for the various secondaries,
including some light cluster particles like deuteron even in heavy ion
collisions.


title: Lattice gas models derived from effective field theory

abstract:
  We start from a low-energy effective field theory for interacting fermions on
the lattice and expand in the hopping parameter to derive the nearest-neighbor
interactions for a lattice gas model. In this model the renormalization of
couplings for different lattice spacings is inherited from the effective field
theory, systematic errors can be estimated a priori, and the breakdown of the
lattice gas model description at low temperatures can be understood
quantitatively. We apply the lattice gas method to neutron matter and compare
with results from a recent quantum simulation.


title: Thermalization of Heavy Quarks in the Quark-Gluon Plasma

abstract:
  Charm- and bottom-quark rescattering in a Quark-Gluon Plasma (QGP) is
investigated with the objective of assessing the approach towards
thermalization. Employing a Fokker-Planck equation to approximate the collision
integral of the Boltzmann equation we augment earlier studies based on
perturbative parton cross sections by introducing resonant heavy-light quark
interactions. The latter are motivated by recent QCD lattice calculations which
indicate the presence of "hadronic" states in the QGP. We model these states by
colorless (pseudo-) scalar and (axial-) vector D- and B-mesons within a
heavy-quark effective theory framework. We find that the presence of these
states at moderate QGP temperatures substantially accelerates the kinetic
equilibration of c-quarks as compared to using perturbative interactions. We
also comment on consequences for $D$-meson observables in ultra-relativistic
heavy-ion collisions.


title:
Approach to the Rotation Driven Vibrational to Axially Rotational Shape
  Phase Transition Along the Yrast Line of a Nucleus

abstract:
  By analyzing the potential energy surface, the shape phase diagram and the
energy spectrum of the nucleus in U(5) symmetry in the IBM, we propose that the
U(5) symmetry with parameters $(A+B) < 0$ may be a model to describe the
rotation driven vibrational to axially rotational phase transition along the
yrast line. With such a model, we have described successfully the observed
rotation driven shape phase transition along the yrast line of individual
nucleus and proposed some other empirical evidences.


title: Axial-vector mesons in a relativistic point-form approach

abstract:
  The Poincare invariant coupled-channel formalism for two-particle systems
interacting via one-particle exchange, which has been developed and applied to
vector mesons in Ref. [1] is applied to axial vector mesons. We thereby extend
the previous study of a dynamical treatment of the Goldstone-boson exchange by
comparison with the commonly used instantaneous approximation to the case of
orbital angular momentum l=1. Effects in the mass shifts show more variations
than for the vector-meson case. Results for the decay widths are sizable, but
comparison with sparse experimental data is inconclusive.


title: Density Matrix Functional Theory with account of pairing correlations

abstract:
  The extension of the density functional theory (DFT) to include pairing
correlations without formal violation of the particle-number conservation
condition is described. This version of the theory can be considered as a
foundation of the application of existing DFT plus pairing approaches to atoms,
molecules, ultracooled and magnetically trapped atomic Fermi gases, and atomic
nuclei where the number of particles is exactly conserved. The connection with
the Hartree-Fock-Bogoliubov theory is discussed. The method of the quasilocal
reduction of the nonlocal theory is described. This quasilocal reduction allows
to obtain equations of motion which are much more simple for the numerical
solution than the equations corresponding to the nonlocal case.


title:
Relativistic Generalization of the Gamow Factor for Fermion Pair
  Production or Annihilation

abstract:
  In the production or annihilation of a pair of fermions, the initial-state or
final-state interactions often lead to significant effects on the reaction
cross sections. For Coulomb-type interactions, the Gamow factor has been
traditionally used to take into account these effects. However the Gamow factor
needs to be modified when the magnitude of the coupling constant or the
relative velocity of two particles increases. We obtain the relativistic
generalization of the Gamow factor in terms of the overlap of the Feynman
amplitude with the relativistic wave function of two fermions with an
attractive Coulomb-type interaction. An explicit form of the corrective factor
is presented for the spin-singlet S-wave state. While the corrective factor
approaches the Gamow factor in the non-relativistic limit, we found that the
Gamow factor significantly over-estimates the effects when the coupling
constant or the velocity is large.


title:
Polarization transfer in $^4$He$(\vec{e},e^\prime\vec{p})$$^3$H: is the
  ratio $G_{Ep}/G_{Mp}$ modified in medium ?

abstract:
  Polarization observables in the $^4$He$(\vec{e},e^\prime\vec{p})$$^3$H
reaction are calculated using accurate three- and four-nucleon bound-state wave
functions, a realistic model for the nuclear electromagnetic current operator,
and a treatment of final-state-interactions with an optical potential. In
contrast to earlier studies, no significant discrepancies are found between
theory and experiment both for the ratio of transverse to longitudinal
polarization transfers and for the induced polarization, when free-nucleon
electromagnetic form factors are used in the current operator. The present
results challenge the current interpretation of the experimental data in terms
of medium-modified form factors.


title:
Polynomial Solutions of Shcrodinger Equation with the Generalized Woods
  Saxon Potential

abstract:
  The bound state energy eigenvalues and the corresponding eigenfunctions of
the generalized Woods Saxon potential are obtained in terms of the Jacobi
polynomials. Nikiforov Uvarov method is used in the calculations. It is shown
that the results are in a good agreement with the ones obtained before.


title: Nonequilibrium Models of Relativistic Heavy-Ion Collisions

abstract:
  We review the results from the various hydrodynamical and transport models on
the collective flow observables from AGS to RHIC energies. A critical
discussion of the present status of the CERN experiments on hadron collective
flow is given. We emphasize the importance of the flow excitation function from
1 to 50 A$\cdot$GeV: here the hydrodynamic model has predicted the collapse of
the $v_1$-flow and of the $v_2$-flow at $\sim 10$ A$\cdot$GeV; at 40
A$\cdot$GeV it has been recently observed by the NA49 collaboration. Since
hadronic rescattering models predict much larger flow than observed at this
energy we interpret this observation as evidence for a first order phase
transition at high baryon density $\rho_B$. Moreover, the connection of the
elliptic flow $v_2$ to jet suppression is examined. It is proven experimentally
that the collective flow is not faked by minijet fragmentation. Additionally,
detailed transport studies show that the away-side jet suppression can only
partially ($<$ 50%) be due to hadronic rescattering. Furthermore, the change in
sign of $v_1, v_2$ closer to beam rapidity is related to the occurence of a
high density first order phase transition in the RHIC data at 62.5, 130 and 200
A$\cdot$GeV.


title: Suppression of modes in the random phase approximation

abstract:
  A general but simple method is proposed to eliminate the quantum fluctuations
generated by selected one-body operators in the excitation spectrum of a
discrete RPA Hamiltonian. This method provides an outstanding tool for the
removal of the contaminating spurious effects originated from symmetry
violations. It can be also applied as a mode filter for analysising RPA
response functions.


title: Meson-Meson Scattering in Relativistic Constraint Dynamics

abstract:
  Dirac's relativistic constraint dynamics have been successfully applied to
obtain a covariant nonperturbative description of QED and QCD bound states. We
use this formalism to describe a microscopic theory of meson-meson scattering
as a relativistic generalization of the nonrelativistic quark-interchange model
developed by Barnes and Swanson.


title: DVCS-Dissociation of the Deuteron and the EMC Effect

abstract:
  The break-up of the deuteron during deeply-virtual Compton scattering, gamma*
d --> gamma(*) n p, is explored. In the effective field theory describing
nucleon dynamics at momenta below the pion mass, the EMC effect results from
four-nucleon interactions with the twist-2 operators, appropriate for
describing forward, and near-forward, matrix elements in the two-nucleon
system. We point out that the break-up of the deuteron to low-energy final
states during deeply-virtual Compton scattering is a process with which to
explore strong-interaction physics closely related to that responsible for the
EMC effect. The single-nucleon contribution to the break-up depends on the
moments of the spin-dependent structure functions and contributions from local
four-nucleon operators. Experimental deviations from the single-nucleon
prediction would provide a probe of strong interactions complimentary to the
EMC effect.


title: Model for Restoration of Heavy-Ion Potentials at Intermediate Energies

abstract:
  Three types of microscopic nucleus-nucleus optical potentials are constructed
using three patterns for their real and imaginary parts. Two of these patterns
are the real $V^H$ and imaginary $W^H$ parts of the potential which reproduces
the high-energy amplitude of scattering in the microscopic Glauber-Sitenko
theory. Another template $V^{DF}$ is calculated within the standard
double-folding model with the exchange term included. For either of the three
tested potentials, the contribution of real and imaginary patterns is adjusted
by introducing two fitted factors. An acceptable agreement with the
experimental data on elastic differential cross-sections was obtained for
scattering the $^{16, 17}$O heavy-ions at about hundred Mev/nucleon on
different target-nuclei. The relativization effect is also studied and found
that, to somewhat, it improves the agreement with experimental data.


title:
Study of the $\Sigma$(1385) and $\Lambda$(1405) resonances in K$^+$
  photoproduction processes

abstract:
  The $\gamma p \to K^+ \pi^0 \Lambda$ and $\gamma p \to K^+ \pi \Sigma $
reactions are studied in the kinematic region where the $\pi^0 \Lambda$(1116)
and $\pi\Sigma$(1192) pairs originate dominantly from the decay of the
$\Sigma$(1385) and $\Lambda$(1405) resonances. We consider laboratory photon
energies around 2 GeV, i.e. total center of mass energies above the known
resonance region. We compute the t-channel kaon-exchange contribution to these
reactions using $K^- p \to \pi^0 \Lambda$ and $K^- p \to \pi \Sigma$ amplitudes
calculated in the framework of a chiral coupled-channel effective field theory
of meson-baryon scattering. We extract from the calculated cross section the
gauge-invariant double kaon pole term. We find this term to be large and likely
to drive significantly the $\gamma p \to K^+ \pi^0 \Lambda$ and $\gamma p \to
K^+ \pi \Sigma $ reactions in the kinematics under investigation. Accurate
measurements of t-distributions for these processes, in progress or planned at
ELSA and at SPring-8, are needed to confirm this expectation and assess the
possibility of studying antikaon-nucleon dynamics just below threshold through
these reactions.


title:
Beta-decay rates of r-process nuclei in the relativistic quasiparticle
  random phase approximation

abstract:
  The fully consistent relativistic proton-neutron quasiparticle random phase
approximation (PN-RQRPA) is employed in the calculation of beta-decay
half-lives of neutron-rich nuclei in the N$\approx$50 and N$\approx$82 regions.
A new density-dependent effective interaction, with an enhanced value of the
nucleon effective mass, is used in relativistic Hartree-Bogoliubov calculation
of nuclear ground states and in the particle-hole channel of the PN-RQRPA. The
finite range Gogny D1S interaction is employed in the T=1 pairing channel, and
the model also includes a proton-neutron particle-particle interaction. The
theoretical half-lives reproduce the experimental data for the Fe, Zn, Cd, and
Te isotopic chains, but overestimate the lifetimes of Ni isotopes and predict a
stable 132Sn.


title:
Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and
  $\gamma N$ reactions for c.m. energies up to 2 GeV

abstract:
  The pion- and photon induced reactions for the final states $\gamma N$, $\pi
N$, $2\pi N$, $\eta N$, and $\omega N$ are studied within a coupled-channel
effective Lagrangian approach in the energy region from the pion threshold up
to 2 GeV. To investigate the role of the nucleon resonances in the different
reactions we include all known states with spin-$\foh$,-$\fth$, and -$\ffh$ and
masses below 2 GeV. We find a strong contribution from the $D_{15}(1675)$
resonance to the $\pi N \to \omega N$ reaction. While the $F_{15}(1680)$ state
only slightly influences the $\omega $ meson production in the $\pi N$
scattering its role is enhanced in the $\omega$ photoproduction due to the
large electromagnetic coupling of this resonance. We predict the beam asymmetry
$\Sigma_X$ to be a negative in the $\gamma p \to \omega p$ reaction near to the
threshold. Above the 1.85 GeV the asymmetry is found to change its sign and
becomes positive at forward directions. The presented findings can be
experimentally tested at GRAAL, CLAS, and CB-ELSA facilities.


title:
Isospin dependence of nucleon effective mass in Dirac
  Brueckner-Hartree-Fock approach

abstract:
  The isospin dependence of the nucleon effective mass is investigated in the
framework of the Dirac Brueckner-Hartree-Fock (DBHF) approach. The definition
of nucleon scalar and vector effective masses in the relativistic approach is
clarified. Only the vector effective mass is the quantity related to the
empirical value extracted from the analysis in the nonrelatiistic shell and
optical potentials. In the relativistic mean field theory, where the nucleon
scalar and vector potentials are both energy independent, the neutron vector
potential is stronger than that of proton in the neutron rich nuclear matter,
which produces a smaller neutron vector effective mass than that of proton. It
is pointed out that the energy dependence of nucleon potentials has to be
considered in the analysis of the isospin dependence of the nucleon effective
mass. In the DBHF the neutron vector effective mass is larger than that of
proton once the energy dependence of nucleon potentials is considered. The
results are consistent with the analysis of phenomenological isospin dependent
optical potentials.


title: Large Momenta Fluctuations Of Charm Quarks In The Quark-Gluon Plasma

abstract:
  We show that large fluctuations of D mesons kinetic energy (or momentum)
distributions might be a signature of a phase transition to the quark gluon
plasma (QGP). In particular, a jump in the variance of the momenta or kinetic
energy, as a function of a control parameter (temperature or Fermi energy at
finite baryon densities) might be a signature for a first order phase
transition to the QGP. This behaviour is completely consistent with the order
parameter defined for a system of interacting quarks at zero temperature and
finite baryon densities which shows a jump in correspondance to a first order
phase transition to the QGP. The $J/\Psi$ shows exactly the same behavior of
the order parameter and of the variance of the D mesons. We discuss
implications for relativistic heavy ion collisions within the framework of a
transport model and possible hints for experimental data.


title: Chiral Symmetry and N*(1440) -> N pi pi Decay

abstract:
  The N*(1440) -> N pi pi decay is studied by making use of the chiral
reduction formula. This formula suggests a scalar-isoscalar pion-baryon contact
interaction which is absent in the recent study of Hern{\'a}ndez et al. The
contact interaction is introduced into their model, and is found to be
necessary for the simultaneous description of g_{RN pi pi} and the pi-pi and
pi-N invariant mass distributions.


title: The ground state in a spin-one color superconductor

abstract:
  Color superconductors in which quarks of the same flavor form Cooper pairs
are investigated. These Cooper pairs carry total spin one. A systematic
group-theoretical classification of possible phases in a spin-one color
superconductor is presented, revealing parallels and differences to the theory
of superfluid $^3$He. General expressions for the gap parameter, the critical
temperature, and the pressure are derived and evaluated for several spin-one
phases, with special emphasis on the angular structure of the gap equation. It
is shown that the (transverse) color-spin-locked phase is expected to be the
ground state.


title: Isoscaling behavior in the Fission Dynamics

abstract:
  The fission processes of $^{112}$Sn + $^{112}$Sn and $^{116}$Sn + $^{116}$Sn
are simulated with the combination of the Langevin equation and the statistical
decay model. The masses of two fission fragments are given by assuming the
process of symmetric fission or asymmetric fission by the Monte Carlo sampling
with the
  Gaussian probability distribution. From the analysis to the isotopic/isotonic
ratios of the fission fragments from both reactions, the isoscaling behavior
has been observed and investigated in details. Isoscaling parameters $\alpha$
and $\beta$ are extracted as a function of the charge number and neutron
number, respectively, in different width of the sampling Gaussian probability
distribution. It seems that $\alpha$ is sensitive to the width of fission
probability distribution of the mass asymmetrical parameter but $\beta$ is not.
Both $\alpha$ and $\beta$ drop with the increasing of beam energy and the
reduced friction parameter.


title: Kaon photo-production on the nucleon and deuteron

abstract:
  Isobaric models for the photo-production of K$^+$ are discussed and their
predictions are shown in the K$^0$ photo-production. The models are further
used in spectator model calculations of the K$^0$ photo-production on deuteron.
Considerable dependence of the inclusive cross section on the elementary
amplitude was found.


title: Electron Screening and Alpha-Decay

abstract:
  The interplay between nuclear and electromagnetic forces in astrophysical
relevant reactions at very low energies is nowadays one of the major subjects
of investigation in nuclear astrophysics. Puzzling results concerning the role
of Electron Screening (ES) on cross sections of reactions involving light
nuclei at low energy open a Pandora pot and many new questions rise on the
limits and reliability of the present interpretation of the screening
enhancement factor. In the present paper we discuss the simplest physical case
where the ES plays an important role in order to have unambiguous determination
of ES energy in a clear theoretical scenario. This is the case of alpha-decay
of heavy mass nuclei. We deduce the correct sudden and adiabatic limit for such
a system including the important relativistic corrections. Then we demonstrate
rigorously how in this case the calculation of the sudden and the adiabatic
limits leads to the same result. In order to get this result we use the
Hellmann-Feynman theorem. After computing the electron screening energy for
some systems we discuss the strong modifications of alpha-decay systematic due
to electron screening. We conclude proposing a measurement of alpha-decay
lifetime of bare nuclei in order to directly deduce ES Energy for heavy nuclei
laying in the mass region around 210-240 u.


title: Transport Theories for Heavy Ion Collisions in the 1 AGeV Regime

abstract:
  We compare multiplicities as well as rapidity and transverse momentum
distributions of protons, pions and kaons calculated within presently available
transport approaches for heavy ion collisions around 1 AGeV. For this purpose,
three reactions have been selected: Au+Au at 1 and 1.48 AGeV and Ni+Ni at 1.93
AGeV.


title: The Fubini-Furlan-Rossetti Sum Rule Revisited

abstract:
  The Fubini-Furlan-Rossetti sum rule for pion photoproduction on the nucleon
is evaluated by dispersion relations at constant t, and the corrections to the
sum rule due to the finite pion mass are calculated. Near threshold these
corrections turn out to be large due to pion-loop effects, whereas the sum rule
value is closely approached if the dispersion integrals are evaluated for
sub-threshold kinematics. This extension to the unphysical region provides a
unique framework to determine the low-energy constants of chiral perturbation
theory by global properties of the excitation spectrum.


title: The importance of few-nucleon physics at low energy

abstract:
  This manuscript originated from the discussion at the workshop on the "Future
of Few-body Low Energy Experimental Physics" (FFLEEP), which was held at the
University of Trento on December 4-7, 2002 and has been written in its present
form on March 19, 2003. It illustrates a selection of theoretical advancements
in the nuclear few-body problem, including two- and many-nucleon interactions,
the three-nucleon bound and scattering system, the four-body problem, the
A-body (A$>$4) problem, and fields of related interest, such as reactions of
astrophysical interest and few-neutron systems. Particular attention is called
to the contradictory situation one experiences in this field: while theory is
currently advancing and has the potential to inspire new experiments, the
experimental activity is nevertheless rapidly phasing out. If such a trend will
continue, advancements in this area will become critically difficult.


title:
The NN final-state interaction in the helicity structure of $\vec
  d(\vec\gamma,\pi^-)pp$ reaction

abstract:
  The influence of final-state $NN$-rescattering on the helicity structure of
the $\vec\gamma\vec d\to\pi^-pp$ reaction in the energy range from
$\pi$-threshold up to 550 MeV has been investigated. The differential polarized
cross-section difference for the parallel and antiparallel helicity states is
predicted and compared with recent experimental data. It is shown that the
effect of $NN$-rescattering is much less important in the polarized
differential cross-section difference than in the previously studied
unpolarized differential cross section. Furthermore, the contribution of
$\vec\gamma\vec d\to\pi^-pp$ to the spin asymmetry of the deuteron is
explicitly evaluated over the region of the $\Delta$(1232)-resonance with
inclusion of $NN$-rescattering. The effect of $NN$ final-state interaction is
found to be much larger in the asymmetry than in the total cross section and
leads to an appreciable reduction of the spin asymmetry in the $\Delta$-region.


title: Polarization Observables in $\gamma N\to K\bar{K}N$

abstract:
  We explore some of the rich structure of the polarization observables
recently developed for processes like $\gamma N\to\pi\pi N$ and $\gamma N\to K
\bar{K} N$ in the framework of a specific model for the latter process.
Emphasis is placed on observables that may be accesible at existing facilities
in the near future. The sensitivity of the observables to the details of the
model indicate that they will be a very useful tool in differentiating between
different models for reactions like these. In the framework of a model for
$\gamma N\to K \bar{K} N$, we examine the sensitivity of the observables to
coupling constants of the $\phi$, to the properties of the $\Lambda(1405)$, and
to the existence of the $\Theta^+$.


title: Bosonization and IBM

abstract:
  We derive a boson Hamiltonian from a Nuclear Hamiltonian whose potential is
expanded in pairing multipoles and determine the fermion-boson mapping of
operators. We use a new method of bosonization based on the evaluation of the
partition function restricted to the bosonic composites of interest. By
rewriting the partition function so obtained in functional form we get the
euclidean action of the composite bosons from which we can derive the
Hamiltonian. Such a procedure respects all the fermion symmetries.


title:
Hadron production from quark coalescence and jet fragmentation in
  intermediate energy collisions at RHIC

abstract:
  Transverse momentum spectra of pions, protons and antiprotons in Au+Au
collisions at intermediate RHIC energy of $\sqrt{s_{NN}}=62$ GeV are studied in
a model that includes both quark coalescence from the dense partonic matter and
fragmentation of the quenched perturbative minijet partons. The resulting
baryon to meson ratio at intermediate transverse momenta is predicted to be
larger than that seen in experiments at higher center of mass energies.


title:
Surface diffuseness anomaly in heavy-ion potentials for large-angle
  quasielastic scattering

abstract:
  Recent high precision experimental data for heavy-ion fusion reactions at
subbarrier energies systematically show that a surprisingly large surface
diffuseness parameter for a Woods-Saxon potential is required in order to fit
the data. We point out that experimental data for quasi-elastic scattering at
backward angles also favor a similar large value of surface diffuseness
parameter. Consequently, a double folding approach fails to reproduce the
experimental excitation function of quasielastic scattering for the $^{16}$O +
$^{154}$Sm system at energies around the Coulomb barrier. We also show that the
deviation of the ratio of the quasielastic to the Rutherford cross sections
from unity at deep subbarrier energies offers an unambiguous way to determine
the value of the surface diffuseness parameter in the nucleus-nucleus
potential.


title:
Nucleon correlations and Higher Twist effects in nuclear structure
  functions

abstract:
  The overlap of the nucleons in nuclei plays an important role in
understanding the nuclear dependence of deep inelastic scattering data. It is
shown that the nuclear modification of the higher twist scale can be
essentially determined by the overlapping volume per nucleon and this effect
gives a large contribution to nuclear shadowing for small $x$ and low $Q^2$. In
this kinematical region there is also a moderate enhancement of the
longitudinal structure function in nuclei.


title: On Nucleon Electromagnetic Form Factors

abstract:
  A Poincare' covariant Faddeev equation, which describes baryons as composites
of confined-quarks and -nonpointlike-diquarks, is solved to obtain masses and
Faddeev amplitudes for the nucleon and Delta. The amplitudes are a component of
a nucleon-photon vertex that automatically fulfills the Ward-Takahashi identity
for on-shell nucleons. These elements are sufficient for the calculation of a
quark core contribution to the nucleons' electromagnetic form factors. An
accurate description of the static properties is not possible with the core
alone but the error is uniformly reduced by the incorporation of meson-loop
contributions. Such contributions to form factors are noticeable for Q^2 < ~2
GeV^2 but vanish with increasing momentum transfer. Hence, larger Q^2
experiments probe the quark core. The calculated behaviour of
G_E^p(Q^2)/G_M^p(Q^2) on Q^2 \in [2,6] GeV^2 agrees with that inferred from
polarisation transfer data. Moreover, \sqrt{Q^2} F_2(Q^2)/F_1(Q^2) is
approximately constant on this domain. These outcomes result from correlations
in the proton's amplitude.


title:
Non-perturbative finite $T$ broadening of the $\rho$ meson and dilepton
  emission in heavy ion-collisions

abstract:
  We study self-consistently the finite $T$ broadening of the $\rho$-meson and
its implications for dilepton emission in heavy ion-collisions. For this
purpose finite width effects at finite temperature due to the $\rho$-$\pi$
interaction are investigated in a self-consistent $\Phi$-functional approach.
The temperature dependence of the $\rho$-meson and pion spectral functions and
self-energies is discussed. The spectral functions show considerable broadening
in comparison with a perturbative calculation on the one-loop level. Using
these spectral functions, we make a comparison to dilepton emission data from
the CERES NA49 collaboration employing a parametrized fireball evolution model
of collision. We demonstrate that these non-perturbative finite width effects
are in-medium modifications relevant to the understanding of the enhancement of
the low invariant mass spectrum of dileptons emitted in A-A collisions.


title: Suspicion on Engrafting HBT From Astronomy to Heavy Ion Collision

abstract:
  HBT method in astronomy and heavy ion collision is contrasted in present
article.Some differences are found and validity of using HBT in heavy ion
collision is suspected.


title: Large basis ab initio shell model investigation of 9-Be and 11-Be

abstract:
  We are presenting the first ab initio structure investigation of the loosely
bound 11-Be nucleus, together with a study of the lighter isotope 9-Be. The
nuclear structure of these isotopes is particularly interesting due to the
appearance of a parity-inverted ground state in 11-Be. Our study is performed
in the framework of the ab initio no-core shell model. Results obtained using
four different, high-precision two-nucleon interactions, in model spaces up to
9\hbar\Omega, are shown. For both nuclei, and all potentials, we reach
convergence in the level ordering of positive- and negative-parity spectra
separately. Concerning their relative position, the positive-parity states are
always too high in excitation energy, but a fast drop with respect to the
negative-parity spectrum is observed when the model space is increased. This
behavior is most dramatic for 11-Be. In the largest model space we were able to
reach, the 1/2+ level has dropped down to become either the first or the second
excited state, depending on which interaction we use. We also observe a
contrasting behavior in the convergence patterns for different two-nucleon
potentials, and argue that a three-nucleon interaction is needed to explain the
parity inversion. Furthermore, large-basis calculations of 13-C and 11-B are
performed. This allows us to study the systematics of the position of the first
unnatural-parity state in the N=7 isotone and the A=11 isobar. The 11-B run in
the 9\hbar\Omega model space involves a matrix with dimension exceeding 1.1 x
10^9, and is our largest calculation so far. We present results on binding
energies, excitation spectra, level configurations, radii, electromagnetic
observables, and 10-Be+n overlap functions.


title:
New limit on fundamental weak-interaction parameters from superallowed
  beta decay

abstract:
  A new critical survey of all world data on superallowed beta decays provides
demanding tests of, and tight constraints on, the weak interaction. In
confirmation of the conserved vector current (CVC) hypothesis, the vector
coupling coupling constant is demonstrated to be constant to better than 3
parts in 10^4, and any induced scalar current is limited to fs \leq 0.0013 in
electron rest-mass units. The possible existence of a fundamental scalar
current is similarly limited to |Cs/Cv| \leq 0.0013. The superallowed data also
determine the CKM matrix element to be Vud = 0.9738(4). With PDG values for Vus
and Vub, the top-row test of CKM unitarity yields Vud^2 + Vus^2 + Vub^2 =
0.9966(14); although, if a recent result on Ke3 decay is used exclusively to
obtain Vus, this sum becomes 0.9999(16). Limits on possible right-hand currents
are given.


title: Jet Tomography of Quark Gluon Plasma

abstract:
  Recent experimental measurements of high $p_T$ hadron spectra and jet
correlation at RHIC are analyzed within a parton model which incoporates
initial jet production and final propagation in heavy-ion collisions. The
suppresion of single hadron spectra, back-to-back correlation, their centrality
dependence and azimuthal anisotropy point to a dense matter with an initial
parton density about 30 times of that in a cold heavy nucleus.


title: Low-momentum interactions for nuclei

abstract:
  We show how the renormalization group is used to construct a low-momentum
nucleon-nucleon interaction V_{low k}, which unifies all potential models used
in nuclear structure calculations. V_{low k} can be directly applied to the
nuclear shell model or to nucleonic matter without a G matrix resummation. It
is argued that V_{low k} parameterizes a high-order chiral effective field
theory two-nucleon force. We use cutoff dependence as a tool to assess the
error in the truncation of nuclear forces to two-nucleon interactions and
introduce a low-momentum three-nucleon force, which regulates A=3,4 binding
energies. The adjusted three-nucleon interaction is perturbative for small
cutoffs. In contrast to other precision interactions, the error due to missing
many-body forces can be estimated, when V_{low k} and the corresponding
three-nucleon force are used in nuclear structure calculations and the cutoff
is varied.


title:
A simple qualitative description of EMC ratios \mu^A for 0.2 <~ x <~ 1.5
  and some sample calculations

abstract:
  We study EMC ratios on the basis of a relation between Structure Functions
(SF) for a nucleus and for a nucleon, which is governed by a SF f^{PN,A}(x,Q^2)
of an unphysical nucleus, composed of point-nucleons. We demonstrate that the
characteristic features of EMC ratios \mu^A are determined by the above
f^{PN,A} and the SF of free nucleons. We account for the positions of the
points x_{1,2} in the interval 0.2 <~ x <~ 0.9, where \mu^A(x,Q^2)=1 and also
for the minimum x_m in that interval. We similarly describe the oscillations in
\mu^A for Q^2 <~ (3.5-4.0) GeV^2 in the Quasi-Elastic peak region 0.95 <~ x <~
1.05 and for its subsequent continuous increase up to x\approx 1.4. Finally we
compute \mu^A over the entire range above for A=^4He, C, Fe and Au and several
Q^2 values. The results are in reasonable agreement with both directly measured
and indirectly extracted data.


title:
Power-law behavior observed in $p_{T}$-distributions and its
  implications in relativistic heavy-ion collisions

abstract:
  Preconception-free analyses of the inclusive invariant transverse-momentum
distribution data taken from the measurements of Au+Au collisions at
$\sqrt{s_{NN}}=130$ GeV and $\sqrt{s_{NN}}=200$ GeV have been performed. It is
observed that the distributions exhibit for $p_{T}\geq 2$ GeV/c remarkably good
power-law behavior ($p_{T}$-scaling) with general regularities. This power-law
behavior leads us in particular to recognize that the concept of centrality,
albeit its simple appearance, is rather complex; its underlying geometrical
structure has to be understood in terms of fractal dimensions. Experimental
evidences and theoretical arguments are given which show that the observed
striking features are mainly due to geometry and self-organized criticality. A
simple model is proposed which approximately reproduces the above-mentioned
data for the ``suppression'' without any adjustable parameter. Further
heavy-ion collision experiments are suggested.


title:
Nuclear stopping and flow in heavy ion collisions and the in-medium NN
  cross section

abstract:
  We present transport calculations for heavy ion reactions in which the mean
field and the in-medium nucleon-nucleon cross section are consistently based on
the same effective interaction, i.e. the in-medium T-matrix from microscopic
Dirac-Brueckner calculations. Doing so, the stopping in central reactions in
terms of the recently proposed $var_{\rm tl}$ observable and the correlation to
the behavior of the directed flow is investigated. The relation to the nuclear
shear viscosity is discussed.


title:
Superallowed nuclear beta decays: A critical survey with tests of CVC
  and the standard model

abstract:
  A complete and critical survey is presented of all half-life, decay-energy
and branching-ratio measurements related to 20 superallowed decays; no
measurements are ignored, though some are rejected for cause and others
updated. A new calculation of the statistical rate function is described and
experimental ft values determined. The associated theoretical corrections
needed to convert these results into Ft values are discussed, and careful
attention is paid to the origin and magnitude of their uncertainties. As an
exacting confirmation of the conserved vector current hypothesis, the Ft values
are seen to be constant to 3 parts in 10^4. These data are also used to set new
limits on any possible scalar interactions or right-hand currents. The average
Ft value obtained from the survey, when combined with the muon lifetime, yields
the CKM matrix element Vud = 0.9738(4); and the unitarity test on the top row
of the matrix becomes |Vud|^2 + |Vus|^2 + |Vub|^2 = 0.9966(14) using the PDG's
currently recommended values for Vus and Vub. We discuss the priorities for
future theoretical and experimental work with the goal of making the CKM
unitarity test more definitive.


title: Mononuclear caloric curve in a mean field model

abstract:
  A mean field model is used to investigate if a plateau in caloric curve can
be reached in mononuclear configuration. In the model the configuration will
break up into many pieces as the plateau is approached.


title: Pseudoscalar and vector mesons as q\bar{q} bound states

abstract:
  Two-body bound states such as mesons are described by solutions of the
Bethe-Salpeter equation. We discuss recent results for the pseudoscalar and
vector meson masses and leptonic decay constants, ranging from pions up to
c\bar{c} bound states. Our results are in good agreement with data. Essential
in these calculation is a momentum-dependent quark mass function, which evolves
from a constituent-quark mass in the infrared region to a current-quark mass in
the perturbative region. In addition to the mass spectrum, we review the
electromagnetic form factors of the light mesons. Electromagnetic current
conservation is manifest and the influence of intermediate vector mesons is
incorporated self-consistently. The results for the pion form factor are in
excellent agreement with experiment.


title: Diquark properties and their role in hadrons

abstract:
  Diquark correlations are important in baryons, which can be modeled as
quark-diquark bound states. In addition, diquarks could play a role in
non-standard hadrons such as tetraquarks and pentaquarks. Here, we obtain
properties of these diquarks from the corresponding bound state equation, using
a model for the effective quark-quark interaction that has proved successful in
the light meson sector. Subsequently, we use the same model to estimate the
masses of the lightest diquark-diquark and diquark-antidiquark states.


title: Reaction Dynamics with Exotic Beams

abstract:
  We review the new possibilities offered by the reaction dynamics of
asymmetric heavy ion collisions, using stable and unstable beams. We show that
it represents a rather unique tool to probe regions of highly Asymmetric
Nuclear Matter ($ANM$) in compressed as well as dilute phases, and to test the
in-medium isovector interaction for high momentum nucleons. The focus is on a
detailed study of the symmetry term of the nuclear Equation of State ($EOS$) in
regions far away from saturation conditions but always under laboratory
controlled conditions.
  Thermodynamic properties of $ANM$ are surveyed starting from nonrelativistic
and relativistic effective interactions. In the relativistic case the role of
the isovector scalar $\delta$-meson is stressed. The qualitative new features
of the liquid-gas phase transition, "diffusive" instability and isospin
distillation, are discussed. The results of ab-initio simulations of n-rich,
n-poor, heavy ion collisions, using stochastic isospin dependent transport
equations, are analysed as a function of beam energy and centrality. The
isospin dynamics plays an important role in all steps of the reaction, from
prompt nucleon emissions to the final fragments. The isospin diffusion is also
of large interest, due to the interplay of asymmetry and density gradients. In
relativistic collisions, the possibility of a direct study of the covariant
structure of the effective nucleon interaction is shown. Results are discussed
for particle production, collective flows and iso-transparency.
  Perspectives of further developments of the field, in theory as well as in
experiment, are presented.


title: Modified Dihadron Fragmentation Functions in Hot and Nuclear Matter

abstract:
  Medium modification of dihadron fragmentation functions due to gluon
bremsstrahlung induced by multiple partonic scattering is studied in both
deep-inelastic scattering (DIS) off large nuclei and high-energy heavy-ion
collisions within the same framework of twist expansion. The modified
fragmentation functions for dihadrons are found to follow closely that of
single hadrons leading to a weak nuclear suppression of their ratios as
measured by HERMES in DIS experiments. Meanwhile, a moderate medium enhancement
of the near-side correlation of two high transverse momentum hadrons with
increasing centrality is found in heavy-ion collisions because of the trigger
bias and the increase in parton energy loss with centrality. Successful
comparisons between theory and experiment for multi-hadron observables in both
confining and deconfined environments offers comprehensive evidence for
partonic energy loss as the mechanism of jet modification in dense matter.


title:
Collective Paths Connecting the Oblate and Prolate Shapes in 68Se and
  72Kr Suggested by the Adiabatic Self-Consistent Collective Coordinate Method

abstract:
  By means of the adiabatic self-consistent collective coordinate method and
the pairing-plus-quadrupole interaction, we have obtained the self-consistent
collective path connecting the oblate and prolate local minima in 68Se and 72Kr
for the first time. The self-consistent collective path is found to run
approximately along the valley connecting the oblate and prolate local minima
in the collective potential energy landscape. This result of calculation
clearly indicates the importance of triaxial deformation dynamics in
oblate-prolate shape coexistence phenomena.


title: Relativistic effects in neutron-deuteron elastic scattering

abstract:
  We solved the three-nucleon Faddeev equation including relativistic features
such as relativistic kinematics, boost effects and Wigner spin rotations. As
dynamical input a relativistic nucleon-nucleon interaction exactly on-shell
equivalent to the AV18 potential has been used. The effects of Wigner rotations
for elastic scattering observables were found to be small. The boost effects
are significant at higher energies.They diminish the transition matrix elements
at higher energies and lead in spite of the increased relativistic phase-space
factor as compared to the nonrelativistic one to rather small effects in the
cross section, which are mostly restricted to the backward angles.


title: Nuclear matrix elements of double beta decay from beta decay

abstract:
  The evaluation of the nuclear matrix elements (NME) of the two-neutrino
double beta ($2\nu\beta\beta$) decay and neutrinoless double beta
($0\nu\beta\beta$) decay using the proton-neutron quasiparticle random-phase
approximation (pnQRPA) is addressed. In particular, the extraction of a proper
value of the proton-neutron particle-particle interaction parameter, $g_{\rm
pp}$, of this theory is analyzed in detail. Evidence is shown, that it can be
misleading to use the experimental half-life of the $2\nu\beta\beta$ decay to
extract a value for $g_{\rm pp}$. Rather, arguments are given in favour of
using the available data on single beta decay for this purpose.


title:
On radiative np -> 1s + gamma transitions, induced by strong low-energy
  interactions,in kaonic atoms

abstract:
  We calculate the rates of the radiative transitions np -> 1s + gamma in
kaonic hydrogen and kaonic deuterium, induced by strong low-energy interactions
and enhanced by Coulomb interactions. The obtained results should be taken into
account for the theoretical analysis of the experimental data on the X-ray
spectra and yields in kaonic atoms.


title:
Measuring the $\phi$ meson width in the medium from $p$ induced $\phi$
  production in nuclei

abstract:
  We study the $A$ dependence of the $\phi$ meson production cross section in
proton nucleus reactios at energies just above threshold, which are accessible
in an experimental facility like COSY. This $A$ dependence has two sources: the
distortion of the incident proton and the absorption of the $\phi$ in its way
out of the nucleus. This second process reduces the cross section in about a
factor two in heavy nuclei. Thus we show that the $A$ dependence of the cross
section contains valuable information on the $\phi$ width in the nuclear
medium.


title: Dynamics and thermodynamics of fragment emission from excited sources

abstract:
  In this paper we study the process of fragmentation of highly excited
Lennard-Jones drops by introducing the concept of emitted fragments (clusters
recognizable in configuration space which live more than a minimum lifetime).
We focus on the dynamics and thermodynamics of the emitted sources, and show,
among other things, that this kind of process can not be cast into a sequential
or simultaneous one, and how a local equilibrium scenario comes up, allowing us
to define and explore a local temperature, which turns out to be a strongly
time-dependent quantity.


title: Coulomb effects in four nucleon continuum states

abstract:
  The Faddeev-Yakubovski equations are solved in configuration space for low
energy four-nucleon continuum states. Coulomb interaction was included into the
formalism permitting an exact description of the scattering states in
p+$^{3}$He and p+$^{3}$H systems.


title: Shape-phase transitions in nuclei and random interactions

abstract:
  In these lecture notes I present a short review of nuclear shapes, shape
coexistence and shape-phase transitions in the interacting boson model. In a
study with random interactions it is shown that the appearance of regular
spectral features is a far more common phenomenon than was previously thought.
The origin of these features are explained by studying the relation with the
underlying geometric shapes.


title:
The complement: a solution to liquid drop finite size effects in phase
  transitions

abstract:
  The effects of the finite size of a liquid drop undergoing a phase transition
are described in terms of the complement, the largest (but still mesoscopic)
drop representing the liquid in equilibrium with the vapor. Vapor cluster
concentrations, pressure and density from fixed mean density lattice gas
(Ising) model calculations are explained in terms of the complement. Accounting
for this finite size effect is key to determining the infinite nuclear matter
phase diagram from experimental data.


title: Microscopic Calculations of Nuclear EDM

abstract:
  We carry out the microscopic calculations of the atomic EDM in deuterium, Xe
and Hg atomic systems. Due to Schiff's theorem, we obtain the atomic EDM only
from the finite nuclear size effects, but it is found that the atomic EDM is
appreciably larger than expected. This is essentially due to the new mechanism
in which the nuclear excitations are taken into account while atomic states
stay in the ground state. The EDM of deuterium is found to be $d_D \simeq 0.017
d_n$ while the EDM of Xe and Hg become $d_{\rm Xe} \simeq 1.6 d_n$ and $d_{{\rm
Hg}} \simeq -2.8 d_n$, respectively. It turns out that the new constraint on
the neutron EDM becomes $d_n \simeq (0.37\pm 0.17 \pm 0.14)\times 10^{-28} {\rm
e}\cdot {\rm cm}$.


title: Centrality Dependence of Bulk Fireball Properties at RHIC

abstract:
  We explore the centrality dependence of properties of the dense hadronic
matter created in \sqrt{s_{NN}}=200 GeV Au--Au collisions at RHIC. Using the
statistical hadronization model we fit particle yields known for 11 centrality
bins. We present the resulting model parameters, rapidity yields of physical
quantities and the physical properties of bulk matter at hadronization as
function of centrality. We discuss the production of strangeness and entropy.


title: Nuclear Clustering and Interactions Between Nucleons

abstract:
  Nuclear mass data provide EMPIRICAL evidence of: 1. Clustering of nucleons;
2. Attractive n-p interactions; and 3. Repulsive but symmetric n-n and p-p
interactions after correcting for the repulsive Coulomb interactions between
positive nuclear charges. These findings suggest a possible source of energy in
neutron stars, in stars which formed on them, and demonstrate the need for a
Theoretical understanding of 1. Interactions between nucleons; 2. Clustering of
nucleons; and 3. Neutron-emission by penetration of the gravitational barrier
surrounding a neutron star.


title: High-K Precession modes: Axially symmetric limit of wobbling motion

abstract:
  The rotational band built on the high-K multi-quasiparticle state can be
interpreted as a multi-phonon band of the precession mode, which represents the
precessional rotation about the axis perpendicular to the direction of the
intrinsic angular momentum. By using the axially symmetric limit of the
random-phase-approximation (RPA) formalism developed for the nuclear wobbling
motion, we study the properties of the precession modes in $^{178}$W; the
excitation energies, B(E2) and B(M1) values. We show that the excitations of
such a specific type of rotation can be well described by the RPA formalism,
which gives a new insight to understand the wobbling motion in the triaxial
superdeformed nuclei from a microscopic view point.


title: Nucleons and nuclei in the context of low-energy QCD

abstract:
  This presentation reports on recent developments concerning basic aspects of
low-energy QCD as they relate to the understanding of the nucleon mass and the
nuclear many-body problem.


title:
The balance functions in azimuthal angle is a measure of the transverse
  flow

abstract:
  The charge or barion number balance function in the relative azimuthal angle
of a pair of particles emitted in ultrarelativistic heavy ion collisions is
studied. The pi+pi- and ppbar balance functions are computed using thermal
models with two different set of parameters, corresponding to a large
freeze-out temperature and a moderate transverse flow or a small temperature
and a large transverse flow. The single particle spectra including pions from
resonance decays are similar for the two scenarios, on the other hand the
azimuthal balance function is very different and could serve as an independent
measure of the transverse flow at the freeze-out.


title: Strange particle production in a single-freeze-out model

abstract:
  The transverse-momentum spectra and elliptic flow of strange particles are
calculated in the framework of the single-freeze-out model and compared with
the recent RHIC data. An overall very good agreement between the model
predictions and the data is obtained.


title:
Theoretical analysis of resonance states in $^{4}H$, $^{4}He$ and
  $^{4}Li$ above three-cluster threshold

abstract:
  The resonance states of $^{4}H$, $^{4}He$ and $^{4}Li$, embedded in the
three-cluster $d+N+N$ continuum, are investigated within a three-cluster model.
The model treats the Pauli principle exactly and incorporates the Faddeev
components for proper description of the boundary conditions for the two- and
three-body continua. The hyperspherical harmonics are used to distinguish and
numerate channels of the three-cluster continuum. It is shown that the
effective barrier, created by three-cluster configuration $d+N+N$, is strong
enough to accommodate two resonance states.


title:
A microscopic investigation of the transition form factor in the region
  of collective multipole excitations of stable and unstable nuclei

abstract:
  We have used a self-consistent Skyrme-Hartree-Fock plus Continuum-RPA model
to study the low-multipole response of stable and neutron/proton-rich Ni and Sn
isotopes. We focus on the momentum-transfer dependence of the strength
distribution, as it provides information on the structure of excited nuclear
states and in particular on the variations of the transition form factor (TFF)
with the energy. Our results show, among other things, that the TFF may show
significant energy dependence in the region of the isoscalar giant monopole
resonance and that the TFF corresponding to the threshold strength in the case
of neutron-rich nuclei is different compared to the one corresponding to the
respective giant resonance. Perspectives are given for more detailed future
investigations.


title: The Modified J-Matrix Approach for Cluster Descriptions of Light Nuclei

abstract:
  We present a fully microscopic three-cluster nuclear model for light nuclei
on the basis of a J-Matrix approach. We apply the Modified J-Matrix method on
$^{6}He$ and $^{6}Be$ for both scattering and reaction problems, analyse the
Modified J-Matrix calculation, and compare the results to experimental data.


title:
Isospin dependence of nucleon emission and radial flow in heavy-ion
  collisions induced by high energy radioactive beams

abstract:
  Using an isospin- and momentum-dependent transport model we study the
emission of free nucleons and the nuclear radial flow in central heavy-ion
collisions induced by high energy radioactive beams. The midrapidity
neutron/proton ratio and its transverse momentum dependence are found very
sensitive to the high density behavior of nuclear symmetry energy. The nuclear
radial flow, however, depends only weakly on the symmetry energy.


title: Particle emission in hydrodynamics: a problem needing a solution

abstract:
  A survey of various mechanisms for particle emission in hydrodynamics is
presented. First, in the case of sudden freeze out, the problem of negative
contributions in the Cooper-Frye formula and ways out are presented. Then the
separate chemical and thermal freeze out scenario is described and the
necessity of its inclusion in a hydrodynamical code is discussed. Finally, we
show how to formulate continuous particle emission in hydrodynamics and discuss
extensively its consistency with data. We point out in various cases that the
interpretation of data is quite influenced by the choice of the particle
emission mechanism.


title: Energy Centroids of Spin $I$ States by Random Two-body Interactions

abstract:
  In this paper we study the behavior of energy centroids (denoted as
$\bar{E_I}$) of spin $I$ states in the presence of random two-body
interactions, for systems ranging from very simple systems (e.g. single-$j$
shell for very small $j$) to very complicated systems (e.g., many-$j$ shells
with different parities and with isospin degree of freedom). Regularities of
$\bar{E_I}$'s discussed in terms of the so-called geometric chaoticity (or
quasi-randomness of two-body coefficients of fractional parentage) in earlier
works are found to hold even for very simple systems in which one cannot assume
the geometric chaoticity. It is shown that the inclusion of isospin and parity
does not "break" the regularities of $\bar{E_I}$'s.


title: In-Medium Properties of Hadrons - Observables II

abstract:
  In this review we discuss the observable consequences of in-medium changes of
hadronic properties in reactions with elementary probes, and in particular
photons, on nuclei. After an outline of the theoretical method used we focus on
a discussion of actual observables in photonuclear reactions; we discuss in
detail $2\pi$- and vector-meson production. We show that the $2\pi^0$
photoproduction data can be well described by final state interactions of the
pions produced whereas the semi-charged $\pi^0\pi^\pm$ channel exhibits a major
discrepancy with theory. For $\omega$ production on nuclei in the TAPS/CB@ELSA
experiment we analyse the $\pi^0\gamma$ decay channel, and illustrate the
strength of the method by simulating experimental acceptance problems.
Completely free of final state interactions is dilepton production in the few
GeV range. We show that the sensitivity of this decay channel to changes of
hadronic properties in medium in photonuclear reactions on nuclei is as large
as in ultrarelativistic heavy ion collisions and make predictions for the
on-going G7 experiment at JLAB. Finally we discuss that hadron production in
nuclei at 10 -- 20 GeV photon energies can give important information on the
hadronization process, and in particular on the time-scales involved. We show
here detailed calculations for the low-energy (12 GeV) run at HERMES and
predictions for planned experiments at JLAB.


title: On the Regularisation in J-matrix Methods

abstract:
  We investigate the effects of the regularization procedure used in the
J-Matrix method. We show that it influences the convergence, and propose an
alternative regularization approach. We explicitly perform some model
calculations to demonstrate the improvement.


title:
Monopole and quadrupole polarization effects on the alpha-particle
  description of $^{8}$Be

abstract:
  We investigate the effect of monopole and quadrupole modes on the elastic
alpha-alpha resonance structure of $^{8}$Be. To this end we make a fully
microscopic coupled channels calculation with three coupled channels, using the
Algebraic Model. The continuum spectrum and wave functions are analyzed in
terms of the individual channels to understand the nature of the resonances. It
is shown that both monopole and quadrupole modes have a non-negligible effect
on the resonances in the alpha-alpha continuum.


title:
Cold quantum gases: coherent quantum phenomena from Bose-Einstein
  condensation to BCS pairing of fermions

abstract:
  Studies of trapped quantum gases of bosons and of fermions have opened up a
new range of many-body problems, having a strong overlap with nuclear and
neutron star physics. Topics discussed here include: the Bose yrast problem --
how many-particle Bose systems carry extreme amounts of angular momentum; the
infrared divergent structure of the transition to Bose condensation in a weakly
interacting system; and the physics of extremely strongly interacting Bose and
Fermi systems, in the scale-free regime where the two body s-wave scattering
lengths are large compared with the interparticle spacing. Such a regime is
realized experimentally through use of atomic Feshbach resonances. Finally we
discuss creation of BCS-paired states in trapped Fermi gases.


title:
Nuclear matter symmetry energy from generalized polarizabilities:
  dependences on momentum, isospin, density and temperature

abstract:
  Symmetry energy terms from macroscopic mass formulae are investigated as
generalized polarizabilities of nuclear matter. Besides the neutron-proton
(n-p) symmetry energy the spin dependent symmetry energies and a scalar one are
also defined. They depend on the nuclear densities ($\rho$), neutron-proton
asymmetry ($b$), temperature ($T$) and exchanged energy and momentum ($q$).
Based on a standard expression for the generalized polarizabilities, a
differential equation is proposed to constrain the dependence of the symmetry
energy on the n-p asymmetry and on the density. Some solutions are discussed.
The q-dependence (zero frequence) of the symmetry energy coefficients with
Skyrme-type forces is investigated in the four channels of the particle-hole
interaction. Spin dependent symmetry energies are also investigated indicating
much stronger differences in behavior with $q$ for each Skyrme force than the
results for the neutron-proton one.


title:
Low energy $n-\nuc{3}{H}$ scattering : a novel testground for nuclear
  interaction

abstract:
  The low energy $n-\nuc{3}{H}$ elastic cross sections near the resonance peak
are calculated by solving the 4-nucleon problem with realistic NN interactions.
Three different methods -- Alt, Grassberger and Shandas (AGS), Hyperspherical
Harmonics and Faddeev-Yakubovsky -- have been used and their respective results
are compared. We conclude on a failure of the existing NN forces to reproduce
the $n-\nuc{3}{H}$ total cross section.


title: Two-nucleon transfer reactions uphold supersymmetry in atomic nuclei

abstract:
  The spectroscopic strengths of two-nucleon transfer reactions constitute a
stringent test for two-nucleon correlations in the nuclear wave functions. A
comparison between the recently measured 198Hg(d,alpha)196Au reaction and the
predictions from the nuclear quartet supersymmetry lends further support to the
validity of supersymmetry in nuclear physics.


title: Fitting theories of nuclear binding energies

abstract:
  In developing theories of nuclear binding energy such as density-functional
theory, the effort required to make a fit can be daunting due to the large
number of parameters that may be in the theory and the large number of nuclei
in the mass table. For theories based on the Skyrme interaction, the effort can
be reduced considerably by using the singular value decomposition to reduce the
size of the parameter space. We find that the sensitive parameters define a
space of dimension four or so, and within this space a linear refit is adequate
for a number of Skyrme parameters sets from the literature. We do not find
marked differences in the quality of the fit between the SLy4, the Bky4 and SkP
parameter sets. The r.m.s. residual error in even-even nuclei is about 1.5 MeV,
half the value of the liquid drop model. We also discuss an alternative norm
for evaluating mass fits, the Chebyshev norm. It focuses attention on the cases
with the largest discrepancies between theory and experiment. We show how it
works with the liquid drop model and make some applications to models based on
Skyrme energy functionals. The Chebyshev norm seems to be more sensitive to new
experimental data than the root-mean-square norm. The method also has the
advantage that candidate improvements to the theories can be assessed with
computations on smaller sets of nuclei.


title:
Electromagnetic excitation rates for nuclear isomers in a hot dense
  plasma

abstract:
  In high neutron flux environments where isomers can be strongly populated by
nucleonic reactions, isotope abundances from reaction network chains can be
affected by the population of nuclear isomers. At high temperatures and
densities there is the additional possibility of populating these isomers
electromagnetically. Here we examine the rates for electromagnetic excitation
of the isotopes of several isomers of interest both in astrophysics and applied
physics (e.g. 235U, 193Ir, and 87Y,88Y). We consider six possible
electromagnetic processes, namely, photo-absorption, inverse internal
conversion, inelastic electron scattering, Coulomb excitation, (gamma,gamma)
and (e,e'gamma) reactions. We find that for plasma temperatures kT~ 1-10 keV
the electromagnetic reactions rates are negligible. Thus, we conclude that
reaction network calculations do not need to include for the possibility of
electromagnetically exciting nuclear isomers. This is true in both stellar and
terrestrial thermonuclear explosions, as well as in plasma conditions expected
at the National Ignition Facility.


title: Density Functional Theory: Methods and Problems

abstract:
  The application of density functional theory to nuclear structure is
discussed, highlighting the current status of the effective action approach
using effective field theory, and outlining future challenges.


title:
Hydrodynamics at RHIC -- how well does it work, where and how does it
  break down?

abstract:
  I review the successes and limitations of the ideal fluid dynamic model in
describing hadron emission spectra from Au+Au collisions at the Relativistic
Heavy Ion Collider (RHIC).


title: Photoproduction of Theta+ on the nucleon and deuteron

abstract:
  Photoproduction of the pentaquark particle Theta^+ on the nucleon has been
studied by using an isobar and a Regge model. Using the isobar model, total
cross sections around 100 nb for the gamma n --> K- Theta+ channel and 400 nb
for the gamma p --> {\bar K}0 Theta+ process are obtained. The inclusion of the
K* intermediate state yields a substantially large effect, especially in the
gamma p --> {\bar K}0 Theta+ process. The Regge approach predicts smaller cross
sections, i.e., less than 100 nb (20 nb) for the process on the neutron
(proton). By using an elementary operator from the isobar model, cross sections
for the process on a deuteron are predicted.


title: Photoproduction of Pentaquark in Feynman and Regge Theories

abstract:
  Photoproduction of the Theta+ pentaquark on the proton is analyzed by using
an isobar and a Regge models. The difference in the calculated total cross
section is found to be more than two orders of magnitude for a hadronic form
factor cut-off Lambda > 1 GeV. Comparable results would be obtained for 0.6 <
Lambda < 0.8 GeV. We also calculate contribution of the Theta+ photoproduction
to the GDH integral. By comparing with the current phenomenological
calculation, it is found that the GDH sum rule favors the result obtained from
Regge approach and isobar model with small Lambda.


title: Kaon Photoproduction in the Feynman and Regge Theories

abstract:
  Kaon photoproduction on the nucleon has been investigated in the isobar
(Feynman) and Regge frameworks. Two possible combinations of the theories are
discussed. Results are compared with present experimental data.


title:
Cronin momentum behavior in saturation model for $p+A$, $d+A$, $A+A$
  collisions

abstract:
  In this paper we consider Cronin momentum behaviour for $p+A$, $d+A$ and
$A+A$ collisions in saturation model. Our analysis shows that Cronin momentum
behavior at different rapidities and energies, can be related with scaling law
using simple dimensional consideration. Using exact numerical solution of
Balitsky-Kovchegov equation we show that although this dependence is slightly
different for McLerran-Venugopalan and Balitsky-Kovchegov definition of gluon
distribution function in simple model in this case dependencies is almost the
same (i.e ratio of Cronin momentum calculated using these gluon distribution
functions is big constant). This can be used to experimentally distinguish this
two variant of gluon distribution function definition in saturation model and
choose the right one.