title:
Resonance Contributions to $\eta$ Photoproduction on Protons Found Using
  Dispersion Relations and an Isobar Model

abstract:
  The contributions of the resonances $D_{13}(1520)$, $S_{11}(1535)$,
$S_{11}(1650)$, $D_{15}(1675)$, $F_{15}(1680)$, $D_{13}(1700)$, $P_{11}(1710)$,
$P_{13}(1720)$ to $\gamma p\to \eta p$ are found from the data on cross
sections, beam and target asymmetries using two approaches: fixed-t dispersion
relations and an isobar model. Utilization of the two approaches and comparison
of the results obtained with different parametrizations of the resonance
contributions allowed us to make conclusions about the model-dependence of
these contributions. We conclude that the results for the contributions of the
resonances $D_{13}(1520)$, $S_{11}(1535)$, $F_{15}(1680)$ to corresponding
multipole amplitudes are stable. With this the results for $D_{13}(1520)$ and
$F_{15}(1680)$, combined with their PDG photoexcitation helicity amplitudes,
allowed us to find the branching ratios $Br (D_{13}(1520)\to \eta N)=0.05\pm
0.02%$, $Br (F_{15}(1680)\to \eta N)=0.16\pm0.04%$ which have significantly
better accuracy than the PDG data. The total Breit-Wigner width of the
$S_{11}(1535)$ is model-dependent, we have obtained $\Gamma (S_{11}(1520))=142
MeV$ and $195 MeV$ using dispersion relations and the isobar model,
respectively. The results for the $S_{11}(1650)$, $D_{15}(1675)$,
$P_{11}(1710)$, $P_{13}(1720)$ are model dependent, only the signs and orders
of magnitude of their contributions to multipole amplitudes are determined. The
results for the $D_{13}(1700)$ are strongly model-dependent.


title: The Gamow-Teller States in Relativistic Nuclear Models

abstract:
  The Gamow-Teller(GT) states are investigated in relativistic models. The
Landau-Migdal(LM) parameter is introduced in the Lagrangian as a contact term
with the pseudo-vector coupling. In the relativistic model the total GT
strength in the nucleon space is quenched by about 12% in nuclear matter and by
about 6% in finite nuclei, compared with the one of the Ikeda-Fujii-Fujita sum
rule. The quenched amount is taken by nucleon-antinucleon excitations in the
time-like region. Because of the quenching, the relativistic model requires a
larger value of the LM parameter than non-relativistic models in describing the
excitation energy of the GT state. The Pauli blocking terms are not important
for the description of the GT states.


title: v4: A small, but sensitive observable for heavy ion collisions

abstract:
  Higher order Fourier coefficients of the azimuthally dependent single
particle spectra resulting from noncentral heavy ion collisions are
investigated. For intermediate to large transverse momenta, these anisotropies
are expected to become as large as 5 %, and should be clearly measurable. The
physics content of these observables is discussed from two different extreme
but complementary viewpoints, hydrodynamics and the geometric limit with
extreme energy loss.


title: Caloric curves of atomic nuclei and other small systems

abstract:
  Caloric curves have traditionally been derived within the microcanonical
ensemble via dS/dE=1/T or within the canonical ensemble via E=T^2*d(ln Z)/dT.
In the thermodynamical limit, i.e., for large systems, both caloric curves give
the same result. For small systems like nuclei, the two caloric curves are in
general different from each other and neither one is reasonable. Using
dS/dE=1/T, spurious structures like negative temperatures and negative heat
capacities can occur and have indeed been discussed in the literature. Using
E=T^2*d(ln Z)/dT a very featureless caloric curve is obtained which generally
smoothes too much over structural changes in the system. A new approach for
caloric curves based on the two-dimensional probability distribution P(E,T)
will be discussed.


title: Oblate-prolate transition in odd-mass light mercury isotopes

abstract:
  Anomalous isotope shifts in the chain of light Hg isotopes are investigated
by using the Hartree-Fock-Bogoliubov method with the Skyrme SIII, SkI3 and SLy4
forces. The sharp increase in the mean-square radius of the odd mass
$^{181-185}$Hg isotopes is well explained in terms of the transition from an
oblate to a prolate shape in the ground state of these isotopes. We discuss the
polarization energy of time-odd mean-field terms in relation to the blocked
level by the odd neutron.


title: Antiprotonic Potentials from Global Fits to the PS209 Data

abstract:
  The experimental results for strong interaction effects in antiprotonic atoms
by the PS209 collaboration consist of high quality data for several sequences
of isotopes along the periodic table. Global analysis of these data in terms of
a $\bar p$-nucleus optical potential achieves good description of the data
using a s-wave finite-range \bar p N interaction. Equally good fits are also
obtained with a poorly-defined zero-range potential containing a p-wave term.


title: Finite Temperature Study of Nuclear Matter in SU(2) Chiral Sigma Model

abstract:
  We study here the equation of state of symmetric nuclear matter at finite
temperatures using a modified SU(2) Chiral Sigma model. The effect of
temperature on effective mass, pressure, entropy and binding energy is
discussed. The liquid-gas phase transition is investigated and the critical
values of temperature, density and pressure are calculated.


title: Quantum Mechanical Three-Body Problem with Short-Range Interactions

abstract:
  We have investigated S-wave bound states composed of three identical bosons
interacting via regulated delta function potentials in non-relativistic quantum
mechanics. For low-energy systems, these short-range potentials serve as an
approximation to the underlying physics, leading to an effective field theory.
  A method for perturbatively expanding the three-body bound-state equation in
inverse powers of the cutoff is developed. This allows us to extract some
analytical results concerning the behavior of the system. Further results are
obtained by solving the leading order equations numerically to 11 or 12 digits
of accuracy. The limit-cycle behavior of the required three-body contact
interaction is computed, and the cutoff-independence of bound-state energies is
shown. By studying the relationship between the two- and three-body binding
energies, we obtain a high accuracy numerical calculation of Efimov's universal
function.
  Equations for the first order corrections, necessary for the study of cutoff
dependence, are derived. However, a numerical solution of these equations is
not attempted.


title:
Superdeformed bands in neutron-rich Sulfur isotopes suggested by cranked
  Skyrme-Hartree-Fock calculations

abstract:
  On the basis of the cranked Skyrme-Hartree-Fock calculations in the
three-dimensional coordinate-mesh representation, we suggest that, in addition
to the well-known candidate 32S, the neutron-rich nucleus 36S and the drip-line
nuclei,48S and 50S, are also good candidates for finding superdeformed
rotational bands in Sulfur isotopes. Calculated density distributions for the
superdeformed states in 48S and 50S exhibit superdeformed neutron skins


title: New method of studying slow strange meson properties in nuclear matter

abstract:
  We suggest the new experimental method to explore the properties of slow
strange mesons at normal nuclear matter density. We show that the $K^{+}$ and
$K^{-}$ mesons with extremely small momenta relative to the surrounding medium
rest frame can be produced in nucleus-nucleon collisions and their production
cross sections are experimentally measurable. The experiments on study of the
momentum dependence of meson-nuclear potentials are discussed.


title:
Correlation Between the Deuteron Characteristics and the Low-energy
  Triplet np Scattering Parameters

abstract:
  The correlation relationship between the deuteron asymptotic normalization
constant, $A_{S}$, and the triplet np scattering length, $a_{t}$, is
investigated. It is found that 99.7% of the asymptotic constant $A_{S}$ is
determined by the scattering length $a_{t}$. It is shown that the linear
correlation relationship between the quantities $A_{S}^{-2}$ and $1/a_{t}$
provides a good test of correctness of various models of nucleon-nucleon
interaction. It is revealed that, for the normalization constant $A_{S}$ and
for the root-mean-square deuteron radius $r_{d}$, the results obtained with the
experimental value recommended at present for the triplet scattering length
$a_{t}$ are exaggerated with respect to their experimental counterparts. By
using the latest experimental phase shifts of Arndt et al., we obtain, for the
low-energy scattering parameters ($a_{t}$, $r_{t}$, $P_{t}$) and for the
deuteron characteristics ($A_{S}$, $r_{d}$), results that comply well with
experimental data.


title: A quark model analysis of the charge symmetry breaking in nuclear force

abstract:
  In order to investigate the charge symmetry breaking (CSB) in the short range
part of the nuclear force, we calculate the difference of the masses of the
neutron and the proton, $\Delta {\rm M}$, the difference of the scattering
lengths of the p-p and n-n scatterings, $\Delta a$, and the difference of the
analyzing power of the proton and the neutron in the n-p scattering, $\Delta
A(\theta)$, by a quark model. In the present model the sources of CSB are the
mass difference of the up and down quarks and the electromagnetic interaction.
We investigate how much each of them contributes to $\Delta {\rm M}$, $\Delta
a$ and $\Delta A(\theta)$. It is found that the contribution of CSB of the
short range part in the nuclear force is large enough to explain the observed
$\Delta A(\theta)$, while $\Delta a$ is rather underestimated.


title: NN final-state interaction in two-nucleon knockout from $^{16}O$

abstract:
  The influence of the mutual interaction between the two outgoing nucleons
(NN-FSI) in electro- and photoinduced two-nucleon knockout from $^{16}O$ has
been investigated perturbatively. It turns out that the effect of NN-FSI
depends on the kinematics and on the type of reaction considered. The effect is
generally larger in pp- than in pn-knockout and in electron induced than in
photoinduced reactions.
  In superparallel kinematics NN-FSI leads in the $(e,e'pp)$ channel to a
strong increase of the cross section, that is mainly due to a strong
enhancement of the $\Delta$-current contribution. In pn-emission, however, this
effect is partially cancelled by a destructive interference with the seagull
current. For photoreactions NN-FSI is considerably reduced in superparallel
kinematics and can be practically negligible in specific kinematics.


title:
The neutron magnetic form factor G_M^n(Q^2) from Quasi-Elastic inclusive
  scattering data on D and 4He

abstract:
  We analyze cross sections for Quasi-Elastic inclusive scattering of electrons
on nuclei and show that the observed isolated peaks for relatively low $Q^2$
are unique for the lightest targets. Focusing in particular on D and $^4$He, we
investigate in two ways to what measure the above peaks can be allocated to
nucleon-elastic processes. We first compute approximate upper limits for the
nucleon-inelastic background in the Quasi-Elastic region due to inclusive
$\Delta$ excitation, and find those to be small. Far more precise is a
semi-phenomenological approach, where the dominance of nucleon-elastic
processes is translated into a set of stringent requirements. We show that
those are very well fulfilled for recent D data, and to a somewhat lesser
extent for older D and $^4$He data. With knowledge of $G_{E,M}^p$ and
information on $G_E^n$, we then extract $G_M^n$ and find agreement with values
obtained by alternative methods. We discuss the sensitivity of the extraction
method and mention future applications.


abstract:
  We discuss the mechanisms that lead to $\Lambda(1405)$ production in the
$\pi^-p\to K^0\pi\Sigma$ reaction. The problem has gained renewed interest
after different works converge to the conclusion that there are two resonances
around the region of 1400 MeV, rather than one, and that they couple
differently to the $\pi\Sigma$ and $\bar{K}N$ channels. We look at the dynamics
of that reaction and find two mechanisms which eventually filter each one of
the resonances, leading to very different shapes of the $\pi\Sigma$ invariant
mass distributions. The combination of the two mechanisms leads to a shape of
this distribution compatible with the experimental measurements.


title: Complex scaling of the hyper-spheric coordinates and Faddeev equations

abstract:
  We implement complex scaling of Faddeev equations using hyper-spheric
coordinates and adiabatic expansion. Complex scaling of coordinates allows
convenient calculations of three-body resonances. We derive the necessary
equations and investigate the adiabatic spectrum at large distances. We
illustrate the viability of the implementation by calculations of several
three-body resonances: a $0^+$ resonance in a model benchmark system of three
identical bosons; the $2^+$ resonance in the $^6$He nucleus within the
$\alpha+n+n$ model; and the two $0^+$ resonances in $^{12}$C within the
three-$\alpha$ model.


title: The Oklo Constraints on Alpha-Decay Half-Lives

abstract:
  The Oklo data constrain the depth of the nuclear potential well to a small
margin of error, determined by various unknowns, such as the reactor
temperature. However, we show that even these small variations could allow the
U-238 half-life to vary by more than one order of magnitude.


title: Mass Dependence of Disappearance of Transverse Flow

abstract:
  A complete theoretical study is presented for the disappearance of flow, for
the first time, by analyzing 15 reactions with masses between 47 and 476 units.
We demonstrate that the effect of nucleon-nucleon cross-section reduces to
insignificant level for heavier colliding nuclei in agreement with previous
studies. A stiff equation of state with nucleon-nucleon cross-sections of 35-40
mb is able to explain all the measured balance energies within few percent. A
power law is also given for the mass dependence of the disappearance of flow
which is in excellent agreement with experimental data.


title: Eta electroproduction on nuclei in the nucleon resonance region

abstract:
  We investigate eta electroproduction on nuclei for Q^2=2.4 and 3.6 GeV^2 in
the framework of a coupled-channel BUU transport model. We analyze the
importance of final state interactions and side feeding and compare with
findings drawn from eta photoproduction. It is shown that in contrast to
photoproduction the influence of etas stemming from secondary processes becomes
important at high Q^2.


title: The Deuteron as a Canonically Quantized Biskyrmion

abstract:
  The ground state configurations of the solution to Skyrme's topological
soliton model for systems with baryon number larger than 1 are well
approximated with rational map ans\"atze, without individual baryon
coordinates. Here canonical quantization of the baryon number 2 system, which
represents the deuteron, is carried out in the rational map approximation. The
solution, which is described by the 6 parameters of the chiral group
SU(2)$\times$SU(2), is stabilized by the quantum corrections. The matter
density of the variational quantized solution has the required exponential
large distance falloff and the quantum numbers of the deuteron. Similarly to
the axially symmetric semiclassical solution, the radius and the quadrupole
moment are, however, only about half as large as the corresponding empirical
values. The quantized deuteron solution is constructed for representations of
arbitrary dimension of the chiral group.


title: The Nd Break-Up Process in Leading Order in a Three-Dimensional Approach

abstract:
  A three-dimensional approach based on momentum vectors as variables for
solving the three nucleon Faddeev equation in first order is presented. The
nucleon-deuteron break-up amplitude is evaluated in leading order in the NN
T-matrix, which is also generated directly in three dimensions avoiding a
summation of partial wave contributions. A comparison of semi-exclusive
observables in the $d(p,n)pp$ reaction calculated in this scheme with those
generated by a traditional partial wave expansion shows perfect agreement at
lower energies. At about 200 MeV nucleon laboratory energies deviations in the
peak of the cross section appear, which may indicate that special care is
required in a partial wave approach for energies at and higher than 200 MeV.
The role of higher order rescattering processes beyond the leading order in the
NN T-matrix is investigated with the result, that at 200 MeV rescattering still
provides important contributions to the cross section and certain spin
observables. The influence of a relativistic treatment of the kinematics is
investigated. It is found that relativistic effects become important at
projectile energies higher than 200 MeV.


title: New Enhanced Tunneling in Nuclear Processes

abstract:
  The small sub-barrier tunneling probability of nuclear processes can be
dramatically enhanced by collision with incident charged particles.
Semiclassical methods of theory of complex trajectories have been applied to
nuclear tunneling, and conditions for the effects have been obtained. We
demonstrate the enhancement of alpha particle decay by incident proton with
energy of about 0.25 MeV. We show that the general features of this process are
common for other sub-barrier nuclear processes and can be applied to nuclear
fission.


title:
Effect of the bound nucleon form factors on charged-current
  neutrino-nucleus scattering

abstract:
  We study the effect of bound nucleon form factors on charged-current
neutrino-nucleus scattering. The bound nucleon form factors of the vector and
axial-vector currents are calculated in the quark-meson coupling model. We
compute the inclusive $^{12}$C($\nu_\mu,\mu^-$)$X$ cross sections using a
relativistic Fermi gas model with the calculated bound nucleon form factors.
The effect of the bound nucleon form factors for this reaction is a reduction
of $\sim$8% for the total cross section, relative to that calculated with the
free nucleon form factors.


title:
Proton-Induced Fission Cross Section Calculation with the LANL Codes
  CEM2K+GEM2 and LAQGSM+GEM2

abstract:
  The improved Cascade-Exciton Model code CEM2k and the Los Alamos version of
the Quark-Gluon String Model code LAQGSM, previously merged with the
Generalized Evaporation Model code of Furihata (GEM2) were further modified to
provide reliable proton-induced fission cross sections for applications. By
adjusting two parameters in GEM2 for each measured reaction, we were able to
describe very well with CEM2k+GEM2 and LAQGSM+GEM2 all available experimental
fission cross sections induced by protons with energies from 20 MeV to 10 GeV
both for subactinide and actinide targets. We also successfully tested our
approach on several reactions induced by neutrons, pions, and photons.


title:
Interplay between soft and hard hadronic components for identified
  hadrons in relativistic heavy ion collisions

abstract:
  We investigate the transverse dynamics in Au+Au collisions at \sqrt{s_NN}=200
GeV by emphasis upon the interplay between soft and hard components through p_T
dependences of particle spectra, ratios of yields, suppression factors, and
elliptic flow for identified hadrons. From hydrodynamics combined with
traversing minijets which go through jet quenching in the hot medium, we
calculate interactions of hard jets with the soft hydrodynamic components. It
is shown by the explicit dynamical calculations that the hydrodynamic radial
flow and the jet quenching of hard jets are the keys to understand the
differences among the hadron spectra for pions, kaons, and protons. This leads
to the natural interpretation for N_p/N_\pi ~ 1, R_{AA} >~ 1 for protons, and
v_2^p > v_2^\pi recently observed in the intermediate transverse momentum
region at Relativistic Heavy Ion Collider (RHIC).


title:
Effect of Resonant Continuum on Pairing Correlations in the Relativistic
  Approach

abstract:
  A proper treatment of the resonant continuum is to take account of not only
the energy of the resonant state, but also its width. The effect of the
resonant states on pairing correlations is presented based on the relativistic
mean field theory plus Bardeen-Cooper-Schrieffer(BCS) approximation with a
constant pairing strength. The study is performed in an effective Lagrangian
with the parameter set NL3 for neutron rich even-even Ni isotopes. The results
show that the contribution of the proper treatment of the resonant continuum to
pairing correlations for those nuclei close to neutron drip line is important.
The pairing gaps, Fermi energies, pairing correlation energies, and binding
energies are considerably affected with a proper consideration of the width of
resonant states. The problem of an unphysical particle gas, which may appear in
the calculation of the traditional mean field plus BCS method for nuclei in the
vicinity of drip line could be well overcome when the pairing correlation is
performed by using the resonant states instead of the discretized states in the
continuum.


title: Non-equilibrated post freeze out distributions

abstract:
  We discuss freeze out on the hypersurface with time-like normal vector,
trying to answer how realistic is to assume thermal post freeze out
distributions for measured hadrons. Using simple kinetic models for gradual
freeze out we are able to generate thermal post FO distribution, but only in
highly simplified situation. In a more advanced model, taking into account
rescattering and re-thermalization, the post FO distribution gets more
complicated. The resulting particle distributions are in qualitative agreement
with the experimentally measured pion spectra. Our study also shows that the
obtained post FO distribution functions, although analytically very different
from the Juttner distribution, do look pretty much like thermal distributions
in some range of parameters.


title: Genuine collective flow from Lee-Yang zeroes

abstract:
  We propose to use the theory of phase transitions of Lee and Yang as a
practical tool to analyze long-range correlations in a finite-size system. We
apply it to the analysis of anisotropic flow in nucleus-nucleus collisions, and
show that this method is more reliable than any other used so far.


title: Specific heat at constant volume in the thermodynamic model

abstract:
  A thermodynamic model for multifragmentation which is frequently used appears
to give very different values for specific heat at constant volume depending
upon whether canonical or grand canonical ensemble is used. The cause for this
discrepancy is analysed.


title: Probing the Nuclear Neutron Skin by Low-Energy Dipole Modes

abstract:
  Dipole excitations below the neutron threshold in neutron rich Sn isotopes
are studied theoretically in the Quasiparticle-Phonon Model with HFB single
particle input. Of special interest are the low-lying two-phonon 1- states and
the Pygmy Dipole Resonance (PDR). The evolution of low-energy dipole
excitations with neutron excess is investigated over the Sn isotopic chain
including the experimentally unknown regions close to 132Sn. A dependence of
the PDR strengths and centroid energies on the neutron skin thickness is found.
Despite significant multi-phonon contributions to mean energies and transition
strengths, the PDR states retain their one-phonon character. The fragmentation
pattern is reduced with increasing neutron excess towards the N=82 shell
closure which will be of advantage for future experimental work.


title:
How does breakup influence the total fusion of $^{6,7}$Li at the Coulomb
  barrier?

abstract:
  Total (complete + incomplete) fusion excitation functions of $^{6,7}$Li on
$^{59}$Co and $^{209}$Bi targets around the Coulomb barrier are obtained using
a new continuum discretized coupled channel (CDCC) method of calculating
fusion. The relative importance of breakup and bound-state structure effects on
total fusion is particularly investigated. The effect of breakup on fusion can
be observed in the total fusion excitation function. The breakup enhances the
total fusion at energies just around the barrier, whereas it hardly affects the
total fusion at energies well above the barrier. The difference between the
experimental total fusion cross sections for $^{6,7}$Li on $^{59}$Co is notably
caused by breakup, but this is not the case for the $^{209}$Bi target.


title: The Cronin Effect, Quantum Evolution and the Color Glass Condensate

abstract:
  We show that the numerical solution of the classical SU(3) Yang-Mills
equations of motion in the McLerran-Venugopalan model for gluon production in
central heavy ion collisions leads to a suppresion at low $p_t$ and an
enhancement at the intermediate $p_t$ region as compared to peripheral heavy
ion and pp collisions at the same energy. Our results are compared to previous,
Color Glass Condensate inspired calculations of gluon production in heavy ion
collisions. We revisit the predictions of the Color Glass Condensate model for
$pA$ ($dA$) collisions in Leading Order and show that quantum evolution--in
particular the phenomenon of geometric scaling and change of anomalous
dimensions--preserves the Cronin enhancement of $pA$ cross section (when
normalized to the leading twist term) in the Leading Order approximation even
though the $p_t$ spectrum can change. We comment on the case when gluon
radiation is included.


title: Is the nuclear force short range ?

abstract:
  Possible strong Van der Waals force is searched in the nuclear interaction,
whose existence is expected when the fundamental interaction between quarks is
strong or superstrong Coulombic type. The relation between the type of the
extra singularity at t=0 of the scattering amplitude and the power of the
asymptotic behavior of the long range potential is derived. The square root
cusp in the once subtracted S-wave amplitude, whose existence is expected when
the Van der Waals force of the London type is acting, is observed when we
analyze the high precision phase shift data of the low energy proton-proton
scattering.


title:
Determination of $S_{17}$ from systematic analyses on $^8$B Coulomb
  breakup with the Eikonal-CDCC method

abstract:
  A new version of the method of Continuum-Discretized Coupled-Channels method
(CDCC) is proposed, that is, the Eikonal-CDCC method (E-CDCC). The E-CDCC
equation, for Coulomb dissociation in particular, can easily and safely be
solved, since it is a first-order differential equation and contains no huge
angular momentum in contrast to the CDCC one. The scattering amplitude
calculated by E-CDCC has a similar form to that by CDCC. Then one can construct
hybrid amplitude in an intuitive way, i.e., CDCC amplitude is adopted for a
smaller angular momentum $L$ and E-CDCC one for a larger $L$ related to an
impact parameter $b$. The hybrid calculation is found to perfectly reproduce
the quantum mechanical result for $^{58}$Ni($^8$B,$^7$Be$+p$)$^{58}$Ni at 240
MeV, which shows its applicability to systematic analysis of $^8$B dissociation
to extract the astrophysical factor $S_{17}$ with high accuracy.


title:
Relativistic short-range correlation effects on the pion dynamics in
  nuclear matter

abstract:
  Replicated theoretical attempts of relativistic approaches to the pion
self-energy in nuclear matter yield unphysical pion spectra. We demonstrate the
crucial dependence of the calculated pion spectra on the correct relativistic
accounting for the short-range correlation effects on the pion self-energy in
the medium. To do this, we simulate the short-range interactions by
phenomenological contact terms in the relativistic Lagrangian density, and
derive the pion self-energy by carefully taking into account the relativistic
kinematics. The obtained spectrum for the pion-like excitations in cold nuclear
matter shows physically meaningful branches, in contrast to those obtained
before by different authors by the use of simplified relativistic approaches to
the short-range correlations.


title:
Transverse momentum dependence of Hanbury Brown-Twiss radii of pions
  from a perfectly opaque source with hydrodynamic flow

abstract:
  We investigate the transverse momentum dependence of pion HBT radii on the
basis of a hydrodynamical model. Recent experimental data show that
$R_{\text{out}}/R_{\text{side}} < 1$, which suggests a strong opaqueness of the
source. In addition to the opaqueness naturally caused by transverse flow, we
introduce an extrinsic opacity by imposing restrictions on the pion emission
angle. Comparing the HBT radii obtained from the normal Cooper-Frye
prescription and the opaque emission prescription, we find that
$R_{\text{out}}/R_{\text{side}}$ is less than unity only for small values of
the transverse momentum with an opaque source. However, HBT radii for large
values of the transverse momentum are dominated by the transverse flow effect
and are affected less by the source opaqueness.


title: Transverse momentum distribution of net baryon number at RHIC

abstract:
  We calculate the transverse momentum distribution of net quarks (quarks minus
antiquarks) in Au+Au collisions at the Relativistic Heavy Ion Collider in the
framework of the parton cascade model at two different rapidities. Parton
re-scattering and fragmentation is seen to lead to a substantial difference in
the slopes of these distributions between mid- and forward-rapidities, in
qualitative agreement with the corresponding data for the net baryon
distribution.


title:
Invariant correlational entropy as a signature of quantum phase
  transitions in nuclei

abstract:
  We study phase transformations in finite nuclei as a function of interaction
parameters. The signature of a transition is given by invariant correlational
entropy that reflects the sensitivity of an individual many-body state to
changes of external parameters; peaks in this quantity indicate the critical
regions. This approach is able to reveal the pairing phase transition, identify
the isovector and isoscalar pairing regions and determine the role of other
interactions. We show the examples of the phase diagram in the parameter space.


title:
$J/\psi$ production in Au+Au collisions at RHIC and the nuclear
  absorption

abstract:
  It is shown that a QCD based nuclear absorption model, with few parameters
fixed to reproduce experimental $J/\psi$ yield in 200 GeV pp/pA and 450 GeV pA
collisions can explain the preliminary PHENIX data on the centrality dependence
of $J/\psi$ suppression in Cu+Cu collisions at RHIC energy, $\sqrt{s_{NN}}$=200
GeV. However, the model does not give satisfactory description to the
preliminary PHENIX data on the centrality dependence of $J/\psi$ suppression in
Au+Au collisions. The analysis suggest that in Au+Au collisions, $J/\psi$ are
suppressed in a medium unlike the medium produced in SPS energy nuclear
collisions or in RHIC energy Cu+Cu collisions.


title: Role of virtual break-up of projectile in astrophysical fusion reactions

abstract:
  We study the effect of virtual Coulomb break-up, commonly known as the dipole
polarizability, of the deuteron projectile on the astrophysical fusion reaction
3He(d,p)4He. We use the adiabatic approximation to estimate the potential shift
due to the E1 transition to the continuum states in the deuteron, and compute
the barrier penetrability in the WKB approximation. We find that the
enhancement of the penetrability due to the deuteron break-up is too small to
resolve the longstanding puzzle observed in laboratory measurements that the
electron screening effect is surprisingly larger than theoretical prediction
based on an atomic physics model. The effect of the 3He break-up in the
3He(d,p)4He reaction, as well as the 7Li break-up in the 7Li(p,alpha)4He
reaction is also discussed.


title:
Multiphoton Exchange Processes in Ultraperipheral Relativistic Heavy Ion
  Collisions

abstract:
  The very strong electromagnetic fields present in ultraperipheral
relativistic heavy ion collisions lead to important higher order effects of the
electromagnetic interaction. These multiphoton exchange processes are studied
using perturbation theory and the sudden or Glauber approximation. In many
important cases, the multi-photon amplitudes factorize into independent
single-photon amplitudes. These amplitudes have a common impact parameter
vector, which induces correlations between the amplitudes. Impact-parameter
dependent equivalent-photon spectra for simultaneous excitation are calculated,
as well as, impact-parameter dependent gammagamma-luminosities. Excitations,
like the multiphonon giant dipole resonances, vector meson production and
multiple e+e- pair production can be treated analytically in a bosonic model,
analogous to the emission of soft photons in QED.


title:
Forward-backward angle asymmetry and polarization observables in
  high-energy deuteron photodisintegration

abstract:
  Deuteron two-body photodisintegration is analysed within the framework of the
Quark-Gluon Strings Model. It is found that the forward-backward angle
asymmetry predicted by the model is confirmed by the recent data at different
photon energies from Jlab. New calculations for polarization observables, the
cross section asymmetry $\Sigma$ and the polarization transfer
$C_{z^{\prime}}$, for photon energies $(1.2\div6)$ GeV are presented and
compared with the data available up to 2 GeV.


title: A full quantal theory of one-neutron halo breakup reactions

abstract:
  We present a theory of one-neutron halo breakup reactions within the
framework of post-form distorted wave Born approximation wherein pure Coulomb,
pure nuclear and their interference terms are treated consistently in a single
setup. This formalism is used to study the breakup of one-neutron halo nucleus
11Be on several targets of different masses. We investigate the role played by
the pure Coulomb, pure nuclear and the Coulomb-nuclear interference terms by
calculating several reaction observables. The Coulomb-nuclear interference
terms are found to be important for more exclusive observables.


title:
Chiral Dynamics of scalar mesons: radiative $\phi$ decay and $\sigma$ in
  the medium through $\pi^0 \pi^0$ nuclear photoproduction

abstract:
  In order to assess the relevance of chiral dynamics in the scalar sector we
address two recent problems: radiative decay of the $\phi$, for which there are
quite recent data from Frascati, and the modification of the $\sigma$
properties in the nuclear medium seen through the $\pi^0 \pi^0$ photoproduction
in nuclei.


title: The N N -> N Delta cross section in nuclear matter

abstract:
  We present calculations of the N N -> N Delta cross section in nuclear matter
within the one-pion exchange model taking into account pion collectivity,
vertex renormalization by the contact nuclear interactions and Dirac effective
masses of the baryons due to coupling with the scalar sigma field. Introducing
the Dirac effective masses leads to an in-medium reduction of the cross
section. The experimental data on pion multiplicities from the collisions of
Ca+Ca, Ru+Ru and Au+Au at 0.4-1.5 A GeV are well described by BUU calculations
with the in-medium cross section.


title: Why the observed jet quenching at RHIC is due to parton energy loss

abstract:
  Significant jet quenching in central $Au+Au$ collisions has been discovered
at RHIC. This paper provides theoretical arguments and lists experimental
evidence that the observed jet quenching at RHIC is due to parton energy loss
instead of hadron rescattering or absorption in a hadronic medium. These
include: (1) hadron formation time based on the uncertainty principle, (2)
$p_T$ dependence and (3) centrality dependence of the observed jet quenching,
(4) jet-like leading hadron correlations (5) high-$p_T$ azimuthal anisotropy
and (6) experimental data from $Pb+Pb$ collisions at SPS and $e+A$ collisions.
Direct measurements of the parton energy loss in the direction of a triggered
high-$p_T$ hadron and the medium modified fragmentation function on the
back-side are proposed to further verify the partonic nature of the observed
jet quenching. The importance of jet quenching studies at lower energies at
RHIC is also discussed.


title:
Effects of nuclear fragmentation on single particle and collective
  motions at low energy

abstract:
  The Faddeev technique is employed to study the influence of both
particle-particle and particle-hole phonons on the one-hole spectral function
of 16O. The formalism includes the effects of nuclear fragmentation and
accounts for collective excitations at a random phase approximation (RPA)
level. The latter are subsequently summed to all orders by the Faddeev
equations to obtain the nucleon self-energy. The results indicate that the
characteristics of hole fragmentation are related to the low-lying states of
16O and an improvement of the description of this spectrum is required to
understand the details of the experimental strength distribution. A first
calculation to improve on this includes the mixing of two-phonon configuration
with particle-hole ones. It is seen that this allows to understand the
formation of excited states which cannot be described by the RPA approach.


title: Valence Quark Distribution in A=3 Nuclei

abstract:
  We calculate the quark distribution function for 3He/3H in a relativistic
quark model of nuclear structure which adequately reproduces the nucleon
approximation, nuclear binding energies, and nuclear sizes for small nuclei.
The results show a clear distortion from the quark distribution function for
individual nucleons (EMC effect) arising dominantly from a combination of
recoil and quark tunneling effects. Antisymmetrization (Pauli) effects are
found to be small due to limited spatial overlaps. We compare our predictions
with a published parameterization of the nuclear valence quark distributions
and find significant agreement.


title: On meson resonances and chiral symmetry

abstract:
  We study meson resonances with quantum numbers J^P=1^+ in terms of the chiral
SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for
the scattering of Goldstone bosons off vector mesons with J^P=1^- once we
insist on approximate crossing symmetry of the unitarized scattering amplitude.
A resonance spectrum arises that is remarkably close to the empirical pattern.
In particular, we find that the strangeness-zero resonances h_1(1380), f_(1285)
and b_1(1235) are formed due to strong K \bar K_\mu and \bar K K_\mu channels.
This leads to large coupling constants of those resonances to the latter
states.


title: Octupole response and stability of spherical shape in heavy nuclei

abstract:
  The isoscalar octupole response of a heavy spherical nucleus is analyzed in a
semiclassical model based on the linearized Vlasov equation. The octupole
strength function is evaluated with different degrees of approximation. The
zero-order fixed-surface response displays a remarkable concentration of
strength in the $1\hbar\omega$ and $3\hbar\omega$ regions, in excellent
agreement with the quantum single-particle response. The collective
fixed-surface response reproduces both the high- and low-energy octupole
rsonances, but not the low-lying $3^{-}$ collective states, while the
moving-surface response function gives a good qualitative description of all
the main features of the octupole response in heavy nuclei. The role of
triangular nucleon orbits, that have been related to a possible instability of
the spherical shape with respect to octupole-type deformations, is discussed
within this model. It is found that, rather than creating instability, the
triangular trajectories are the only classical orbits contributing to the
damping of low-energy octupole excitations.


title: Radiative capture cross sections: challenges and solutions

abstract:
  Radiative capture reactions are one of the main inputs in stellar modelling.
In numerous situations, the low energies at which these reactions occur in
stars are not accessible with present experimental techniques. Electron
screening is one of the major causes of problems in separating the bare cross
sections from the screened ones. Indirect experimental techniques have been
proposed and are now one of the main tools to obtain these cross sections. I
discuss the electron screening problem and the latest progresses obtained with
indirect methods.


title: Production of the exotic Theta baryon in relativistic nuclear collisions

abstract:
  Recent experimental data appear to confirm the existence of the exotic Theta+
(uudd\bar{s}) baryon. Simple statistical considerations, which have generally
proven rather successful, suggest that this particle should be produced in
observable abundance in relativistic nuclear collisions at RHIC, where it may
be identifed through the p-K0_s invariant mass spectrum. The observation would
not only add new evidence for its existence, but would also provide an
additional means for probing the collision system, especially with regard to
strangeness.


title: Heavy Ions at LHC: Theoretical Issues

abstract:
  We give a brief overview of our current theoretical understanding of
ultra-relativistic heavy ion collision and the properties of super-hot nuclear
matter. We focus on several issues that have been discussed in connection with
experimental results from the CERN SPS and from the Relativistic Heavy Ion
Collider RHIC. We give an extrapolation of our current knowledge to LHC
energies and ask which physics questions can be addressed at the LHC.


title:
Non-locality and Medium Effects in the Exclusive Photoproduction of Eta
  Mesons on Nuclei

abstract:
  A relativistic model for the quasifree exclusive photoproduction of $\eta$
mesons on nuclei is extended to include both non-local and medium effects. The
reaction is assumed to proceed via the dominant contribution of the
S$_{11}$(1535) resonance. The complicated integrals resulting from the
non-locality are simplified using a modified version of a method given by
Cooper and Maxwell. The non-locality effects are found to affect the magnitude
of the cross section. Some possibilities reflecting the effects of the medium
on the propagation and properties of the intermediate S$_{11}$ resonance are
studied. The effects of allowing the S$_{11}$ to interact with the medium via
mean field scalar and vector potentials are considered. Both broadening of
width and reduction in mass of the resonance lead to a suppression of the
calculated cross sections.


title: Dressed vertices

abstract:
  The response of a correlated nuclear system to an external field is
discussed. The Bethe-Salpeter equation for the dressed vertex is solved. The
kernel of the integral equation for the vertex is chosen consistently with the
approximation for the self-energy. This guarantees the fulfillment of the f-sum
rule for the response function.


title:
An importance sampling algorithm for generating exact eigenstates of the
  nuclear Hamiltonian

abstract:
  We endow a recently devised algorithm for generating exact eigensolutions of
large matrices with an importance sampling, which is in control of the extent
and accuracy of the truncation of their dimensions. We made several tests on
typical nuclei using a correlated basis obtained from partitioning the shell
model space. The sampling so implemented allows not only for a substantial
reduction of the shell model space but also for an extrapolation to exact
eigenvalues and E2 strengths.


title: Modelling nuclear effects in neutrino interactions in 1 GeV region

abstract:
  We evaluate nuclear effects in neutrino reactions in a framework based on a
model proposed by Marteau with quasi-elastic and $\Delta$ production processes
treated together. Nuclear effects include RPA corrections and $\Delta$ width
modification in nuclear matter.


title: NN correlations and final-state interactions in (e,e'NN) reactions

abstract:
  After a brief overview of relevant studies on one-nucleon knockout showing
the importance of quantitatively understanding the origin of the quenched
spectroscopic factors extracted from data, attention is focussed on two-nucleon
emission as a suitable tool to investigate nucleon-nucleon correlations inside
complex nuclei. In particular, direct (e,e$'$pp) and (e,e$'$pn) reactions are
discussed, and the role of final-state interactions is studied. The influence
of the mutual interaction between the two outgoing nucleons is shown to depend
on the kinematics and on the type of the considered reaction.


title: Systematic study of deformed nuclei at the drip lines and beyond

abstract:
  An improved prescription for choosing a transformed harmonic oscillator (THO)
basis for use in configuration-space Hartree-Fock-Bogoliubov (HFB) calculations
is presented. The new HFB+THO framework that follows accurately reproduces the
results of coordinate-space HFB calculations for spherical nuclei, including
those that are weakly bound. Furthermore, it is fully automated, facilitating
its use in systematic investigations of large sets of nuclei throughout the
periodic table. As a first application, we have carried out calculations using
the Skyrme Force SLy4 and volume pairing, with exact particle number projection
following application of the Lipkin-Nogami prescription. Calculations were
performed for all even-even nuclei from the proton drip line to the neutron
drip line having proton numbers Z=2,4,...,108 and neutron numbers
N=2,4,...,188. We focus on nuclei near the neutron drip line and find that
there exist numerous particle-bound even-even nuclei (i.e., nuclei with
negative Fermi energies) that have at the same time negative two-neutron
separation energies. This phenomenon, which was earlier noted for light nuclei,
is attributed to bound shape isomers beyond the drip line.


title:
On the effectiveness of effective field theory in peripheral
  nucleon-nucleon scattering

abstract:
  Peripheral nucleon-nucleon scattering is analysed in the framework of an
effective field theory. Distorted-wave methods are used to remove the effects
of one-pion exchange. Two-pion exchange and recoil corrections to one-pion
exchange are then subtracted pertubatively. This removes all contributions up
to order Q^3 in the chiral expansion. We have applied this to the 1D2, 1F3 and
1G4 waves, using phase shifts from various partial-wave analyses by the
Nijmegen group. In regions where these analyses agree we find no evidence for a
breakdown of the chiral expansion. One of the terms in the effective
short-range potential, the leading one in the 1D2 channel, is larger might be
expected, but in general these terms have momentum scales of about 300-400 MeV.
We also see hints of isospin breaking in the pi-N couplings.


title: Pairing effects on the collectivity of quadrupole states around 32Mg

abstract:
  The first 2+ states in N=20 isotones including neutron-rich nuclei 32Mg and
30Ne are studied by the Hartree-Fock-Bogoliubov plus quasiparticle random phase
approximation method based on the Green's function approach. The residual
interaction between the quasiparticles is consistently derived from the
hamiltonian density of Skyrme interactions with explicit velocity dependence.
The B(E2) transition probabilities and the excitation energies of the first 2+
states are well described within a single framework. We conclude that pairing
effects account largely for the anomalously large B(E2) value and the very low
excitation energy in 32Mg.


title: Final state interaction effects in semi-inclusive DIS off the deuteron

abstract:
  The effects of the final state interaction (FSI) in semi-exclusive
deep-inelastic scattering of electrons off the deuteron are analyzed paying
particular attention to two extreme kinematical regions: i) the one where FSI
effects are minimized, so that the quark distribution of bound nucleons could
be investigated, and ii) the one where the re-interaction of the produced
hadrons with the spectator nucleon is maximized, which would allow one to study
the mechanism of hadronization of highly virtual quark. It is demonstrated that
when the recoiling spectator nucleon is detected in the backward hemisphere
with low momentum the effects from FSI are negligible, whereas at large
transverse momenta of the spectator the FSI effects are rather large. Numerical
estimates show that the FSI corrections are sensitive to the theoretical models
of the hadronization mechanism.


title: Scalar and vector form factors of the in-medium nucleon

abstract:
  Using the quark-meson coupling model, we calculate the form factors at sigma-
and omega-nucleon strong-interaction vertices in nuclear matter. The
Peierls-Yoccoz projection technique is used to take account of center of mass
and recoil corrections. We also apply the Lorentz contraction to the internal
quark wave function. The form factors are reduced by the nuclear medium
relative to those in vacuum. At normal nuclear matter density and Q^2 = 1
GeV^2, the reduction rate in the scalar form factor is about 15%, which is
almost identical to that in the vector one. We parameterize the ratios of the
form factors in symmetric nuclear matter to those in vacuum as a function of
nuclear density and momentum transfer.


title:
Structure of $^8B$ and astrophysical $S_{17}$ factor in Skyrme
  Hartree-Fock theory

abstract:
  We investigate the ground state structure of $^8$B within the Skyrme
Hartree-Fock framework where spin-orbit part of the effective interaction is
adjusted to reproduce the one-proton separation energy of this nucleus. Using
same set of force parameters, binding energies and root mean square radii of
other light p-shell unstable nuclei, $^8$Li, $^7$B,$^7$Be, and $^9$C, have been
calculated where a good agreement with corresponding experimental data is
obtained. The overlap integral of $^8$B and $^7$Be wave functions has been used
to determine the root mean square radius of the single proton in a particular
orbit and also the astrophysical S factor ($S_{17}$) for the $^{7}$Be($p,
\gamma)^{8}$B radiative capture reaction. It is found that the asymptotic
region (distances beyond 4 fm) of the p-shell single proton wave function
contributes more than half to the calculated value (4.93 fm) of the
corresponding single particle root mean square radius. We determine a $S_{17}$
21.1 eV.b which is in good agreement with the recommended value for near zero
energy $S_{17}$ of $19.0^{+4.0}_{-1.0}$ eV.b.


title: Oriented collisions for cold synthesis of superheavy nuclei

abstract:
  The conditions of optimum orientations (lowest barrier and largest
interaction radius) for deformed colliding nuclei are introduced in "cold"
fusion of superheavy nuclei. Also, the role of (octupole and) hexadecupole
deformations is studied. We have used the proximity potential and applied our
method to Ca-induced reactions.


title:
Simple models of the contribution of intermediate state gluons to J\psi
  suppression at the CERN SPS

abstract:
  We construct three simple scenarios of the evolution of intermediate stage
gluons in Pb-Pb collisions at the CERN SPS. Only the scenario close to the
model of Kharzeev, Lourenco, Nardi and Satz agrees qualitatively with the data
of NA50 Collaboration.


title: SU(2) Chiral Sigma Model Study of Phase Transition in Hybrid Stars

abstract:
  We use a modified SU(2) chiral sigma model to study nuclear matter component
and simple bag model for quark matter constituting a neutron star. We also
study the phase transition of nuclear matter to quark matter with the mixed
phase characterized by two conserved charges in the interior of highly dense
neutron stars. Stable solutions of Tolman-Oppenheimer-Volkoff equations
representing hybrid stars are obtained with a maximum mass of 1.67$M_{\odot}$
and radius around 8.9 km.


title:
Reevaluation of the density dependence of nucleon radius and mass in the
  global color symmetry model of QCD

abstract:
  With the global color symmetry model (GCM) at finite chemical potential, the
density dependence of the bag constant, the total energy and the radius of a
nucleon in nuclear matter is investigated. A relation between the nuclear
matter density and the chemical potential with the action of QCD being taken
into account is obtained. A maximal nuclear matter density for the existence of
the bag with three quarks confined within is given. The calculated results
indicate that, before the maximal density is reached, the bag constant and the
total energy of a nucleon decrease, and the radius of a nucleon increases
slowly, with the increasing of the nuclear matter density. As the maximal
nuclear matter density is reached, the mass of the nucleon vanishes and the
radius becomes infinite suddenly. It manifests that a phase transition from
nucleons to quarks takes place.


title: Characterization of Jets in Relativistic Heavy Ion Collisions

abstract:
  Jet quenching is considered to be one of the signatures of the formation of
quark gluon plasma. In order to investigate the jet quenching, it is necessary
to detect jets produced in relativistic heavy ion collisions, determine their
properties and compare those with the jets one obtains in hadron-hadron or
$e^+-e^-$ collisions. In this work, we propose that calculation of flow
parameters may be used to detect and characterize jets in relativistic heavy
ion collisions.


title: Antibound and Resonant States in Halo Nuclei

abstract:
  An unified shell model scheme to evaluate simultaneously the contribution of
antibound states and Gamow resonances to the nuclear halos is presented. The
calculations, performed in the complex energy plane, are applied to the case of
$^{11}$Li. It is found that $^{11}$Li may develop a resonant state excitation
near the breakup threshold.


title: Nuclear response beyond the Fermi gas model

abstract:
  The Fermi gas model, while providing a reasonable qualitative description of
the continuum nuclear response, does not include the effects of dynamical
nucleon-nucleon correlations in the initial and final states, that have long
been recognized to play a critical role in specific kinematical regions. We
review a many-body approach in which these effects are consistently taken into
account and discuss the results of a calculation of the quasielastic
neutrino-oxygen cross section as an illustrative example.


title: Nuclear Reaction Mechanisms and the Cronin Effect

abstract:
  The influence of nuclear multiscattering and shadowing on pion spectra is
investigated in $pA$ collisions from CERN SPS to RHIC energies. The
calculations are performed in a next-to-leading order (NLO) pQCD-improved
parton model, including intrinsic partonic transverse momentum distributions.
The nuclear modification of the pion spectra (Cronin effect) is considered at
different targets in a wide energy range. Theoretical predictions are displayed
for planned $pA$ experiments at CERN SPS and recent $dAu$ experimental results
are analysed at RHIC.


title:
Description of nuclear systems within the relativistic Hartree-Fock
  method with zero range self-interactions of the scalar field

abstract:
  An exact method is suggested to treat the nonlinear self-interactions (NLSI)
in the relativistic Hartree-Fock (RHF) approach for nuclear systems. We
consider here the NLSI constructed from the relativistic scalar nucleon
densities and including products of six and eight fermion fields. This type of
NLSI corresponds to the zero range limit of the standard cubic and quartic
self-interactions of the scalar field. The method to treat the NLSI uses the
Fierz transformation, which enables one to express the exchange (Fock)
components in terms of the direct (Hartree) ones. The method is applied to
nuclear matter and finite nuclei. It is shown that, in the RHF formalism, the
NLSI, which are explicitly isovector-independent, generate scalar, vector and
tensor nucleon self-energies strongly density-dependent. This strong isovector
structure of the self-energies is due to the exchange terms of the RHF method.
Calculations are carried out with a parametrization containing five free
parameters. The model allows a description of both types of systems compatible
with experimental data.


title:
Color Screening and the Suppression of the Charmonium State Yield in
  Nuclear Reactions

abstract:
  We discuss the new data for the production of the $\psi'$ meson in pA
collisions at 450 GeV at CERN-SPS (of the NA50-collaboration) [1]. We extract
from the CERN data $\sigma(\psi' N)\approx 8$ mb under the assumption that the
$\psi'$ is produced as a result of the space-time evolution of a point-like
$c\bar c$ pair which expands with time to the full size of the charmonium
state. In the analysis we assume the existence of a relationship between the
distribution of color in a hadron and the cross section of its interaction with
a nucleon. However, our result is rather sensitive to the pattern of the
expansion of the wave packet and significantly larger values of $\sigma(\psi'
N)$ are not ruled out by the data. We show that recent CERN data confirm the
suggestion of [2] that color fluctuations of the strengths in
charmonium-nucleon interaction are the major source of suppression of the
$J/\psi$ yield as observed at CERN in both pA and AA collisions.


title:
QCD-view on hadron form factors in space-like and time-like momentum
  transfer regions

abstract:
  QCD gives definite predictions for hadron electromagnetic form factors in
space-like and time-like momentum transfer regions, such as the quark counting
rules, the hypothesis of hadron helicity conservation, and the relations
between nucleon and deuteron form factors in the formalism of reduced nuclear
matrix elements. Recent precise data about these form factors, obtained in
polarization experiments at the Jefferson Laboratory, have essentially changed
our view on this subject. QCD-predictions do not apply to these data up to
$Q^2$=5-6 GeV$^2$ for deuteron and for the electric form factor of proton. An
analysis of these data suggests that the asymptotic region will more probably
start at $Q^2$=20-25 GeV$^2$. We show that the separation of magnetic and
electric proton form factors in the time-like region represents the most
stringent test of the asymptotic regime and QCD-predictions.


title:
Model independent properties of two-photon exchange in elastic electron
  proton scattering

abstract:
  We derive from first principles, as the C-invariance of the electromagnetic
interaction and the crossing symmetry, the general properties of two-photon
exchange in electron-proton elastic scattering. We show that the presence of
this mechanism destroys the linearity of the Rosenbluth separation.


title:
Low energy Kbar N interactions and Faddeev calculation of the K- d
  scattering length in isospin and particle bases

abstract:
  $\Kbar N$ interactions are investigated {\it via} an effective non-linear
chiral meson-baryon Lagrangian. The adjustable parameters are determined by a
fitting procedure on the $K^-p$ threshold branching ratios and total
cross-section data for $p^{lab}_K\le$ 250 MeV/c. We produce predictions for the
$\Sigma \pi$ mass spectrum, and scattering lenghts $a_{K^-p}$, $a_n(K^-n \to
K^-n)$, $a_n0(\Kbar0 n \to \Kbar0 n)$, and $a_{ex}(K^-p \to \Kbar0 n)$. The
$\Kbar N$ amplitudes thus obtained, as well as those for other two-body
channels ($\pi N$, $NN$, and $YN$) are used as input to predict the scattering
length $A_{K^-d}$, for which we have devised a relativistic version of the
three-body Faddeev equations. Results for all two- and three-body coupled
channels are reported both in isospin and particle bases. All available $\Kbar
N$ data are well reproduced and our best results for the $K^-p$ and $K^-d$
scattering lenghts are $a_{K^-p} = (-0.90 + i 0.87) fm$ and $A_{K^-d} = (-1.80
+ i 1.55) fm$.


title: Light-front gauge propagator

abstract:
  Gauge fields are special in the sense that they are invariant under gauge
transformations and they lead to problems when we try quantizing them
straightforwardly. To circumvent this problem we need to specify a gauge
condition to fix gauge.


title:
Relativistic nuclear model with point-couplings constrained by QCD and
  chiral symmetry

abstract:
  We derive a microscopic relativistic point-coupling model of nuclear
many-body dynamics constrained by in-medium QCD sum rules and chiral symmetry.
The effective Lagrangian is characterized by density dependent coupling
strengths, determined by chiral one- and two-pion exchange and by QCD sum rule
constraints for the large isoscalar nucleon self-energies that arise through
changes of the quark condensate and the quark density at finite baryon density.
This approach is tested in the analysis of the equations of state for symmetric
and asymmetric nuclear matter, and of bulk and single-nucleon properties of
finite nuclei. In comparison with purely phenomenological mean-field
approaches, 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 (two-pion exchange)
fluctuations play a prominent role for nuclear binding and saturation, whereas
strong scalar and vector fields of about equal magnitude and opposite sign,
induced by changes of the QCD vacuum in the presence of baryonic matter,
generate the large effective spin-orbit potential in finite nuclei.


title:
Signatures of Chiral Dynamics in Low Energy Compton Scattering off the
  Nucleon

abstract:
  We present a projector formalism which allows to define dynamical
polarizabilities of the nucleon from a multipole expansion of the nucleon
Compton amplitudes. We give predictions for the energy dependence of these
dynamical polarizabilities both from dispersion theory and from
leading-one-loop chiral effective field theory. Based on the good agreement
between the two theoretical frameworks, we conclude that the energy dependence
of the dynamical polarizabilities is dominated by chiral dynamics, except in
those multipole channels where the first nucleon resonance Delta(1232) can be
excited. Both the dispersion theory framework and a chiral effective field
theory with explicit Delta(1232) degrees of freedom lead to a very good
description of the available low energy proton Compton data. We discuss the
sensitivity of the proton Compton cross section to dynamical polarizabilities
of different multipole content and present a fit of the static electric and
magnetic dipole polarizabilities from low-energy Compton data up to omega=170
MeV, finding alpha_E=(11.04+-1.36)*10^(-4) fm^3, beta_M =(2.76-+1.36)*10^(-4)
fm^3.


title:
Comment on "Energies of the ground state and first excited $0^{+}$ in an
  exactly solvable pairing model"

abstract:
  We comment on a recent application of the RPA method and its extensions to
the case of the two-level pairing model by N. Dinh Dang [1].


title: Pion-nucleon scattering in a meson-exchange model

abstract:
  The pi-N interaction is studied within a meson-exchange model and in a
coupled-channels approach which includes the channels pi-N, eta-N, as well as
three effective pi-pi-N channels namely rho-N, pi-Delta, and sigma-N. Starting
out from an earlier model of the Julich group systematic improvements in the
dynamics and in some technical aspects are introduced. With the new model an
excellent quantitative reproduction of the pi-N phase shifts and inelasticity
parameters in the energy region up to 1.9 GeV and for total angular momenta J
leq 3/2 is achieved. Simultaneously, good agreement with data for the total and
differential pi-N -> eta-N transition cross sections is obtained. The
connection of the pi_N dynamics in the S_{11} partial wave with the reaction
pi-N -> eta-N is discussed.


title:
Microscopic calculation of neutrino mean free path inside hot neutron
  matter

abstract:
  We calculate the neutrino mean free path and the Equation of State of pure
neutron matter at finite temperature within a selfconsistent scheme based on
the Brueckner--Hartree--Fock approximation. We employ the nucleon-nucleon part
of the recent realistic baryon-baryon interaction (model NSC97e) constructed by
the Nijmegen group. The temperatures considered range from 10 to 80 MeV. We
report on the calculation of the mean field, the residual interaction and the
neutrino mean free path including short and long range correlations given by
the Brueckner--Hartree--Fock plus Random Phase Approximation (BHF+RPA)
framework. This is the first fully consistent calculation in hot neutron matter
dedicated to neutrino mean free path. We compare systematically our results to
those obtain with the D1P Gogny effective interaction, which is independent of
the temperature. The main differences between the present calculation and those
with nuclear effective interactions come from the RPA corrections to BHF (a
factor of about 8) while the temperature lack of consistency accounts for a
factor of about 2.


title: Interplay of static and dynamic effects in 6He+ 238U Fusion

abstract:
  We investigate the influence of the neutron halo and the breakup channel in
6He + 238U fusion at near-barrier energies. To include static effects of the
2n-halo in 6He nuclei, we use a single-folding potential obtained from an
appropriate nucleon-238U interaction and a realistic 6He density. Dynamical
effects arising from the breakup process are then included through
coupled-channel calculations. These calculations suggest that static effects
dominate the cross section at energies above the Coulomb barrier, while the
sub-barrier fusion cross section appears to be determined by coupling to the
breakup channel. This last conclusion is uncertain due to the procedure
employed to measure the fusion cross-section.


title:
Canonical-basis solution of the Hartree-Fock-Bogoliubov equation on
  three-dimensional Cartesian mesh

abstract:
  A method is presented to obtain the canonical-form solutions of the HFB
equation for atomic nuclei with zero-range interactions like the Skyrme force.
It is appropriate to describe pairing correlations in the continuum in
coordinate-space representations. An improved gradient method is used for
faster convergences under constraint of orthogonality between orbitals. To
prevent high-lying orbitals to shrink into a spatial point, a repulsive
momentum dependent force is introduced, which turns out to unveil the nature of
high-lying canonical-basis orbitals. The asymptotic properties at large radius
and the relation with quasiparticle states are discussed for the obtained
canonical basis.


title: Mass Formulae for Supernarrow Dibaryons and Exotic Baryons

abstract:
  The mass formulae for the supernarrow dibaryons and the exotic baryons with
small masses are consructed. With this aim their self energies are calculated
in one loop approximation using the dispersion relations with two subtractions.
The values of the masses obtained in this approach are in a good agreement with
the experimental data. The mass formula for the baryons is also used to
calculate the mass of the $\Delta(1232)$ resonance.


title: Reply by N. Dinh Dang to the Comment by A. Rabhi

abstract:
  It is pointed out that the ``exact'' solutions given in the recent Comment by
A. Rabhi on the paper [N. Dinh Dang ``Energies of the ground state and first
excited $0^{+}$ state in an exactly solvable pairing model'', Eur. Phys. Jour.
A 16 (2003) 18] do not correspond to the standard exact solution of the
well-known two-level pairing model. Other issues raised in the Comment
reiterate the discussions already published in the original paper by N. Dinh
Dang.


title: Continuum QRPA response for deformed neutron-rich nuclei

abstract:
  We discuss properties of the quadrupole collective excitation of the deformed
neutron-rich nucleus $^{38}$Mg within the framework of quasi-particle random
phase approximation (QRPA). We first solve the coupled-channels equations to
obtain the single-particle levels, and construct the ground state by treating
the pairing correlations in the BCS approximation. We then solve the QRPA
equation using the response function formalism, by including the continuum
spectra with the box dicscretization method. We show that the collectivity of
the gamma vibration (the lowest $K^\pi=2^+$ mode) is significantly enhanced if
protons and neutrons have different deformations. We also discuss an attempt
towards full continuum QRPA calculations for deformed nuclei.


title: Field gauge divergences in the light-front

abstract:
  The Bethe-Salpeter equation for ground state of two fermions exchanging a
gauge boson presents divergences. We used a prescription that allowed an
apropriate prescription of the singularity in the boson propagator.


title: Shell stabilizes nuclear instability: A new phenomenon

abstract:
  Infinite nuclear matter mass model and the relativistic mean field theory
show strong evidence of new neutron magic numbers 100, 150, 164; proton magic
number 78 and new islands of stability around N=100, Z $\simeq$ 62; N=150,
Z=78; and N= 164, Z $\simeq$ 90 in the drip-line regions of nuclear chart. It
is shown that shell effect stabilizes here the instability due to nuclear force
giving rise to a new phenomenon; in contrast to the phenomena of fission isomer
and super heavy elements where Coulomb instability is overcome by the same.


title:
Pygmy Dipol Resonances as a Manifestation of the Structure of the
  Neutron-Rich Nuclei

abstract:
  Dipole excitations in neutron-rich nuclei below the neutron threshold are
investigated. The method is based on Hartree-Fock-Bogoliubov (HFB) and
Quasiparticle-Phonon Model (QPM) theory. Of our special interest are the
properties of the low-lying 1- Pygmy Resonance and the two-phonon
quadrupole-octupole 1- states in Sn-isotopes including exploratory
investigations for the experimentally unknown mass regions. In particular we
investigate the evolution of the dipole strength function with the neutron
excess. The use of HFB mean-field potentials and s.p. energies is found to
provide a reliable extrapolation into the region off stability.


title: Variance of the decay intensity of superdeformed bands

abstract:
  We present analytic formulae for the energy average and variance of the
intraband decay intensity of a superdeformed band.


title: Resonances and the thermonuclear reaction rate

abstract:
  We present an approximate analytic expression for thermonuclear reaction rate
of charged particles when the cross section contains a single narrow or wide
resonance described by a Breit-Wigner shape. The resulting expression is
uniformly valid as the effective energy and resonance energy coalesce. We use
our expressions to calculate the reaction rate for
$^{12}$C(p,$\gamma$)$^{13}$N.


title: Studies of parton thermalization at RHIC

abstract:
  We consider the evolution of a parton system which is formed in the central
region just after a relativistic heavy ion collision. The parton consist of
mostly gluons, minijets, which are produced by elastic scattering between
constituent partons of the colliding nuclei. We assume the system can be
described by a semi-classical Boltzmann transport equation, which we solve by
means of the test particle Monte-Carlo method including retardation. The
partons proliferate via secondary radiative $gg \to ggg$ processes until the
thermalization is reached for some assumptions. The extended system is
thermalized at about $t=1.6$ fm/$c$ with $T = 570$ MeV and stays in equilibrium
for about 2 fm/$c$ with breaking temperature $T = 360$ MeV in the rapidity
central region.


title: Hartree-Fock+BCS approach to unstable nuclei with the Skyrme force

abstract:
  We reanalyze the results of our extensive Hartree-Fock + BCS calculation from
new points of view paying attention to the properties of unstable nuclei. The
calculation has been done with the Skyrme SIII force for the ground and shape
isomeric states of 1029 even-even nuclei ranging 2 <= Z <= 114. We also discuss
the advantages of the employed three-dimensional Cartesian-mesh representation,
especially on its remarkably high precision with apparently coarse meshes when
applied to atomic nuclei. In Appendices we give the coefficients of
finite-point numerical differentiation and integration formulae suitable for
Cartesian mesh representation and elucidate the features of each formula and
the differences from a method based on the Fourier transformation.


title: Transverse momentum spectra of hadrons in pp, pA and AA collisions

abstract:
  The transverse momentum spectra of the produced hadrons have been compared to
a model which is based on the assumption that a nucleus-nucleus collision is a
superposition of isotropically decaying thermal sources at a given freeze out
temperature. The freeze-out temperature in nucleus-nucleus collisions is fixed
from the inverse slope of the transverse momentum spectra of hadrons in
nucleon-nucleon collision. The successive collisions in the nuclear reaction
leads to gain in transverse momentum, as the nucleons propagate in the nucleus
following a random walk pattern. The average transverse rapidity shift per
collision is determined from the nucleon-nucleus collision data. Using these
information we obtain parameter free result for the transverse momentum
distribution of produced hadrons in nucleus-nucleus collisions. It is observed
that such a model is able to explain the transverse mass spectra of produced
pions at SPS energies. However it fails to satisfactorily explain the
transverse mass spectra of kaons and protons. This indicates the presence of
collective effect which cannot be accounted for by the initial state collision
broadening of transverse momentum of produced hadrons, the basis of random walk
model.


title:
Pseudorapidity dependence of parton energy loss in relativistic heavy
  ion collisions

abstract:
  We analyze the recent data from the BRAHMS Collaboration on the
pseudorapidity dependence of nuclear modification factors in Au+Au collisions
at $\sqrt{s_{NN}}$ = 200 GeV by using the full three dimensional hydrodynamic
simulations for the density effects on parton energy loss. We first compute the
transverse spectra at $\eta=0$ and 2.2, and next take a ratio
$R_{\eta}=R_{AA}(\eta=2.2)/R_{AA}(\eta=0)$, where $R_{AA}$ is a nuclear
modification factor. It is shown that hydrodynamic components account for
$R_{\eta}\simeq 1$ at low $p_\mathrm{T}$ and that quenched pQCD components lead
$R_{\eta} < 1$ at high $p_\mathrm{T}$ which are consistent with the data.
Strong suppression at $\eta=2.2$ is compatible with the parton energy loss in
the final state.


title: Light Baryon Resonances: Restrictions and Perspectives

abstract:
  The problem of nucleon resonances N' with masses below the Delta is
considered. We derive bounds for the properties of such states. Some of these
are new, while others improve upon existing limits. We discuss the nature of N'
states, and their unitary partners, assuming their existence can be verified.


title:
Polarization contributions to the spin-dependence of the effective
  interaction in neutron matter

abstract:
  We calculate the modification of the effective interaction of particles on
the Fermi surface due to polarization contributions, with particular attention
to spin-dependent forces. In addition to the standard spin-spin, tensor and
spin-orbit forces, spin non-conserving effective interactions are induced by
screening in the particle-hole channels. Furthermore, a novel long-wavelength
tensor force is generated. We compute the polarization contributions to second
order in the low-momentum interaction V_{low k} and find that the
medium-induced spin-orbit interaction leads to a reduction of the 3P2 pairing
gap for neutrons in the interior of neutron stars.


title:
P-matrix Description of Interaction of Two Charged Hadrons And
  Low-energy Nuclear-Coulomb Scattering Parameters

abstract:
  The scattering of two charged strongly interacting particles is described on
the basis of the P-matrix approach. In the P matrix, it is proposed to isolate
explicitly the background term corresponding to purely Coulomb interaction,
whereby it becomes possible to improve convergence of the expansions used and
to obtain a correct asymptotic behavior of observables at high energies. The
expressions for the purely Coulomb background P matrix, its poles and residues,
and purely Coulomb eigenfunctions of the P-matrix approach are obtained. The
nuclear-Coulomb low-energy scattering parameters of two charged hadrons are
investigated on the basis of this approach combined with the method of
isolating the background P matrix. Simple explicit expressions for the
nuclear-Coulomb scattering length and effective range in terms of the residual
P matrix are derived. These expressions give a general form of the
nuclear-Coulomb low-energy scattering parameters for models of finite-range
strong interaction. Specific applications of the general expressions derived in
this study are exemplified by considering some exactly solvable models of
strong interaction containing hard core repulsion, and, for these models, the
nuclear-Coulomb low-energy scattering parameters for arbitrary values of the
orbital angular momentum are found explicitly. In particular, the
nuclear-Coulomb scattering length and effective range are obtained explicitly
for the boundary-condition model, the model of a hard-core delta-shell
potential, the Margenau model, and the model of hard-core square-well
potential.


title: Unification of the physics of nucleons and nuclei

abstract:
  I outline an ambitious program which aims to achieve a unified description of
nucleon and nuclear properties based on one chiral effective field theory.


title:
Isospin fractionation in the nucleon emissions and fragment emissions in
  the intermediate energy heavy ion collisions

abstract:
  The degree of isospin fractionation is measured by $(N/Z)_{n}$ /
$(N/Z)_{N_{imf}}$, where $(N/Z)_{n}$ and $(N/Z)_{N_{imf}}$ are the saturated
neutron-proton ratio of nucleon emissions (gas phase) and that of fragment
emissions (liquid phase) in heavy ion collision at intermediate energy . The
calculated results by using the isospin-dependent quantum molecular dynamics
model show that the degree of isospin fractionation is sensitive to the
neutron-proton ratio of colliding system but insensitive to the difference
between the neutron-proton ratio of target and that of projectile. In
particular, the degree of isospin fractionation sensitively depends on the
symmetry potential. However its dependences on the isospin dependent in-medium
nucleon-nucleon cross section and momentum dependent interaction are rather
weak.
  The nucleon emission (gas phase) mainly determines the dynamical behavior of
the degree of isospin fractionation in the isospin fractionation process,
compared to the effect of fragment emission. In this case, we propose that
$(N/Z)_{n}$ / $(N/Z)_{N_{imf}}$ or $(N/Z)_{n}$ can be directly compared with
the experimental data so that the information about symmetry potential can be
obtained


title:
Influence of medium correction of nucleon nucleon cross section on the
  fragmentation and nucleon emission

abstract:
  The influence of medium correction from an isospin dependent nucleon nucleon
cross section on the fragmentation and nucleon emission in the intermediate
energy heavy ion collisions was studied by using an isospin dependent quantum
molecular dynamical model (IQMD). We found that the medium correction enhances
the dependence of multiplicity of intermediate mass fragment $N_{imf}$ and the
number of nucleon emission $N_{n}$ on the isospin effect of the nucleon nucleon
cross section,while the momentum dependent interaction (MDI) produces also an
important role for enhancing the influence of the medium correction on the
isospin dependence of two-body collision in the fragmentation and nucleon
emission processes. After considering the medium correction and the role of
momentum dependent interaction the increase for the dependence of $N_{imf}$ and
$N_{n}$ on the isospin effect of two-body collision is favorable to learn the
information about the isospin dependent nucleon nucleon cross section


title:
Probing the isospin dependent mean field and nucleon nucleon cross
  section in the medium by the nucleon emissions

abstract:
  We study the isospin effects of the mean field and two-body collision on the
nucleon emissions at the intermediate energy heavy ion collisions by using an
isospin dependent transport theory. The calculated results show that the
nucleon emission number $N_{n}$ depends sensitively the isospin effect of
nucleon nucleon cross section and weakly on the isospin dependent mean field
for neutron-poor system in higher beam energy region . In particular, the
correlation between the medium correction of two-body collision and the
momentum dependent interaction enhances the dependence of nucleon emission
number $N_{n}$ on the isospin effect of nucleon nucleon cross section.
  On the contrary, the ratio of the neutron proton ratio of the gas phase to
the neutron proton ratio of the liquid phase, i.e., the degree of isospin
fractionation $<(N/Z)_{gas}>_{b}/<(N/Z)_{liq}>_{b}$ depends sensitively on the
isospin dependent mean field and weakly on the isospin effect of two-body
collision for neutron-rich system in the lower beam energy region. In this
case, $N_{n}$ and $<(N/Z)_{gas}>_{b}/<(N/Z)_{liq}>_{b}$ are the probes for
extracting the information about the isospin dependent nucleon nucleon cross
section in the medium and the isospin dependent mean field,respectively.


title:
Medium influence of the nucleon nucleon cross section on the
  fragmentation

abstract:
  Based on an isospin dependent quantum molecular dynamics model we studied the
influence of a medium correction of an isospin dependent nucleon nucleon cross
section on the fragmentation at the intermediate energy heavy ion collisions.
We found that the medium correction from an isospin dependent nucleon nucleon
cross section increases the dependence of the fragmentation on the isospin
effect of in-medium nucleon nucleon cross section, at the same time, the
momentum dependent interaction (MDI) produces also an important role for
enhancing the influence of the medium correction on the isospin effect of
two-body collisions in the fragmentation process. In this case, the dependence
of the multiplicity of intermediate mass fragments $N_{imf}$ on the isospin
effect of two-body collision due to the medium correction and MDI, is a probe
for extracting the information on the isospin dependent nucleon cnucleon cross
section in the medium correction.


title: Lambda-Lambda bond energy from the Nijmegen potentials

abstract:
  The $\Lambda\Lambda$ bond energy $\Delta B_{\Lambda \Lambda}$ in
$\Lambda\Lambda$ hypernuclei is obtained from a $G$-matrix calculation which
includes the coupling between the $\Lambda\Lambda$, $\Xi N$ and $\Sigma\Sigma$
channels, as well as the effect of Pauli blocking to all orders. The Nijmegen
NSC97e model is used as bare baryon-baryon interaction in the strangeness
$S=-2$ sector. The $\Lambda\Lambda$-$\Xi N$ coupling increases substantially
the bond energy with respect to the uncoupled $\Lambda\Lambda$ case. However,
the additional incorporation of the $\Sigma \Sigma$ channel, which couples
simultaneously to $\Lambda\Lambda$ and $\Xi N$ states, has a surprisingly
drastic effect and reduces the bond energy down to a value closer to that
obtained in an uncoupled calculation. We find that a complete treatment of
Pauli blocking reduces the repulsive effect on the bond energy to about half of
what was claimed before.


title:
Comment on Mean First Passage Time for Nuclear Fission and the Emission
  of Light Particles

abstract:
  Theoretical methods, interpretations and conclusions on the fission dynamics
in a recent publication of H. Hofmann and F. A. Ivanyuk on the mean first
passage time are critically considered.


title:
Evidence for nonhadronic degrees of freedom in the transverse mass
  spectra of kaons from relativistic nucleus-nucleus collisions?

abstract:
  We investigate transverse hadron spectra from relativistic nucleus-nucleus
collisions which reflect important aspects of the dynamics - such as the
generation of pressure - in the hot and dense zone formed in the early phase of
the reaction. Our analysis is performed within two independent transport
approaches (HSD and UrQMD) that are based on quark, diquark, string and
hadronic degrees of freedom. Both transport models show their reliability for
elementary $pp$ as well as light-ion (C+C, Si+Si) reactions. However, for
central Au+Au (Pb+Pb) collisions at bombarding energies above $\sim$ 5
A$\cdot$GeV the measured $K^{\pm}$ transverse mass spectra have a larger
inverse slope parameter than expected from the calculation. Thus the pressure
generated by hadronic interactions in the transport models above $\sim$ 5
A$\cdot$GeV is lower than observed in the experimental data. This finding shows
that the additional pressure - as expected from lattice QCD calculations at
finite quark chemical potential and temperature - is generated by strong
partonic interactions in the early phase of central Au+Au (Pb+Pb) collisions.


title: Three-Body Interactions in Many-Body Effective Field Theory

abstract:
  This contribution is an advertisement for applying effective field theory
(EFT) to many-body problems, including nuclei and cold atomic gases. Examples
involving three-body interactions are used to illustrate how EFT's quantify and
systematically eliminate model dependence, and how they make many-body
calculations simpler and more powerful.


title:
A simple model for the quenching of pairing correlations effects in
  rigidly deformed rotational bands

abstract:
  Using Chandrasekhar's S-type coupling between rotational and intrinsic
vortical modes one may simply reproduce the HFB dynamical properties of
rotating nuclei within Routhian HF calculations free of pairing correlations
yet constrained on the relevant so-called Kelvin circulation operator. From the
analogy between magnetic and rotating systems, one derives a model for the
quenching of pairing correlations with rotation, introducing a critical angular
velocity -- analogous to the critical field in supraconductors -- above which
pairing vanishes. Taking stock of this usual model, it is then shown that the
characteristic behavior of the vortical mode angular velocity as a function of
the global rotation angular velocity can be modelised by a simple two parameter
formula, both parameters being completely determined from properties of the
band-head (zero-spin) HFB solution. From calculation in five nuclei, the
validity of this modelised Routhian approach is assessed. It is clearly shown
to be very good in cases where the evolution of rotational properties is only
governed by the coupling between the global rotation and the pairing-induced
intrinsic vortical currents. It therefore provides a sound ground base for
evaluating the importance of coupling of rotation with other modes (shape
distortions, quasiparticle degrees of freedom).


title: Neutrino mean free path in neutron stars

abstract:
  The neutrino propagation in neutron stars is studied in the framework of the
linear response method. The medium effects are treated in the non-relativistic
Brueckner-Hartree-Fock approach either in the mean-field approximation or in
the RPA. The residual interaction is expressed in terms of the Landau
parameters extracted from the equation of state of spin- and isospin-polarized
nuclear matter. The Brueckner theory including three-body forces is used for
determining the equation of state. Numerical predictions for the response
function of nuclear matter in $\beta$-equilibrium and the neutrino mean free
path are presented in a range of baryonic densities and temperatures. The main
results are a dominance of the charge-exchange component over the scattering
component and an enhancement of the neutrino mean free path induced by nuclear
correlations.


title:
The resistible effects of Coulomb interaction on nucleus-vapor phase
  coexistence

abstract:
  We explore the effects of Coulomb interaction upon the nuclear liquid vapor
phase transition. Because large nuclei (A>60) are metastable objects, phases,
phase coexistence, and phase transitions cannot be defined with any generality
and the analogy to liquid vapor is ill-posed for these heavy systems. However,
it is possible to account for the Coulomb interaction in the decay rates and
obtain the coexistence phase diagram for the corresponding uncharged system.


title:
Isospin Symmetry Breaking Effects on the Properties of Asymmetrical
  Nuclear Matter and $\beta$-Stable Matter

abstract:
  We have studied the influences of isospin symmetry breaking of
nucleon-nucleon interaction on the various properties of asymmetrical nuclear
matter and $\beta$-stable matter. For asymmetrical nuclear matter, it is found
that by including this isospin symmetry breaking, the changes of bulk
properties increase by increasing both density and asymmetry parameter.
However, these effects on the total energy and equation of state of
$\beta$-stable matter are ignorable. For asymmetrical nuclear matter, the
validity of the empirical parabolic law in the isospin symmetry breaking case
is shown. It is observed that the isospin symmetry breaking of nucleon-nucleon
interaction affects the $\beta$-equilibrium conditions in $\beta$-stable
matter.


title: Chaos and rotational damping in particle-rotor model

abstract:
  The onset of chaos and the mechanism of rotational damping are studied in an
exactly soluble particle-rotor model. It is shown that the degree of chaoticity
as inferred from the statistical measures is closely related to the onset of
rotational damping obtained using the model Hamiltonian.


title:
Determining the $\Theta^+$ quantum numbers through the $K^+p\to
  \pi^+K^+n$ reaction

abstract:
  We study the $K^+p\to \pi^+K^+n$ reaction with some kinematics suited to the
production of the $\Theta^+$ resonance recently observed. We show that,
independently of the quantum numbers of the $\Theta^+$, a resonance signal is
always observed in the $K^+$ forward direction. In addition, we also show how a
combined consideration of the strength at the peak, and the angular dependence
of polarization observables can help determine the $\Theta^+$ quantum numbers
using the present reaction.


title:
Brueckner Rearrangement Effects in $^5_\Lambda$He and
  $^6_{\Lambda\Lambda}$He

abstract:
  Rearrangement effects in light hypernuclei are investigated in the framework
of the Brueckner theory. We can estimate without detailed numerical
calculations that the energy of the $\alpha$-core is reduced by more than 2.5
MeV when the $\Lambda$ adheres to $^4$He to form $^5_\Lambda$He. Similar
assessment of rearrangement contributions is essential to deduce the strength
of $\Lambda\Lambda$ interaction from experimentally observed $\Delta
B_{\Lambda\Lambda}$. The recently observed experimental value of $\sim$ 1 MeV
for the $\Delta B_{\Lambda\Lambda}$ of \hll suggests that the matrix element of
$<\Lambda \Lambda |v|\Lambda \Lambda>$ in \hll is around -2 MeV.


title: What evidences the mass distribution in halo nucleus?

abstract:
  Detailed analysis of the distribution of nuclear matter in the halo nucleus
$^{11}$Be is performed within the microscopic approach based on the flexible
variational basis of the functions of the "polarized" orbitals model. It is
shown that the proposed approach reproduces, in agreement with the experiment,
the most distinguishing features of the mass distribution in this system.
Taking into account the results of specific calculations and the exceptionally
high reliability of the experimental data on the nuclear density distribution
in the "tail" of $^{11}$Be, we make a conclusion about the existence of new
structures with the sizes considerably exceeding the size of the nucleus (up to
tens of $fm$) and the density being thousands times less that the typical
nuclear one.


title:
Semiclassical Distorted Wave Model Analysis of Backward Proton Emission
  from $(p,p^{\prime}x)$ Reactions at Intermediate Energies

abstract:
  A semiclassical distorted wave (SCDW) model with Wigner transform of one-body
density matrix is presented for multistep direct $(p,p^{\prime}x)$ reactions to
the continuum. The model uses Wigner distribution functions obtained in methods
which include nucleon-nucleon correlations to a different extent, as well as
Woods-Saxon (WS) single-particle wave function. The higher momentum components
of target nucleons that play a crucial role in reproducing the high-energy part
of the backward proton spectra are properly taken into account. This SCDW model
is applied to analyses of multistep direct processes in
$^{12}$C$(p,p^{\prime}x)$, $^{40}$Ca$(p,p^{\prime}x)$ and
$^{90}$Zr$(p,p^{\prime}x)$ in the incident energy range of 150--392 MeV. The
double differential cross sections are calculated up to three-step processes.
The calculated angular distributions are in good agreement with the
experimental data, in particular at backward angles where the previous SCDW
calculations with the WS single-particle wave function showed large
underestimation. It is found that the result with the Wigner distribution
function based on the coherent density fluctuation model provides overall
better agreement with the experimental data over the whole emission energies.


title: Multiple giant resonances in nuclei: their excitation and decay

abstract:
  The excitation of multiphonon giant resonances with heavy ions is discussed.
The conventional theory, based on the use of the virtual photon number method
in conjunction with the harmonic model is presented and its shortcomings are
discussed. The recently developed model that invoke the Brink-Axel mechanism as
an important contribution to the cross-section is discussed and compared to the
conventional, harmonic model. The decay properties of these multiple giant
resonances are also discussed within the same coherent + fluctuation model in
conjunction with the hybrid decay model. It is demonstrated that the Brink-Axel
mechanism enhances the direct decay of the states, as data seem to require.
Comparison of our model with other recent theoretical works is presented.


title: Charmonium Production in gamma-A, p-A and A-A

abstract:
  The data for the production of the $\psi'$ meson in pA collisions at 450 GeV
at CERN-SPS (of the NA50-collaboration) yields $\sigma(\psi' N)\approx 8$ mb
under the assumption that the $\psi'$ is produced as a result of the space-time
evolution of a point-like $c\bar c$ pair which expands with time to the full
size of the charmonium state. However, much higher values of $\sigma(\psi' N)$
are not ruled out by the data. We show that recent CERN data confirm the
suggestion that color fluctuations are the major source of suppression of the
$J/\psi$ yield as observed at CERN in both pA and AA collisions.


title: Next Generation Relativistic Models

abstract:
  The current generation of covariant mean-field models has had many successes
in calculations of bulk observables for medium to heavy nuclei, but there
remain many open questions. New challenges are confronted when trying to
systematically extend these models to reliably address nuclear structure
physics away from the line of stability. In this lecture, we discuss a
framework for the next generation of relativistic models that can address these
questions and challenges. We interpret nuclear mean-field approaches as
approximate implementations of Kohn-Sham density functional theory (DFT), which
is widely used in condensed matter and quantum chemistry applications. We look
to effective field theory (EFT) for a systematic approach to low-energy nuclear
physics that can provide the framework for nuclear DFT.


title: Fractional Energy Loss and Centrality Scaling

abstract:
  The phenomenon of centrality scaling in the high-\pt spectra of $\pi^0$
produced in Au-Au collisions at $\sqrt s=200$ GeV is examined in the framework
of relating fractional energy loss to fractional centrality increase. A new
scaling behavior is found where the scaling variable is given a power-law
dependence on $N_{\rm part}$. The exponent $\gamma$ specifies the fractional
proportionality relationship between energy loss and centrality, and is a
phenomenologically determined number that characterizes the nuclear suppression
effect. The implication on the parton energy loss in the context of
recombination is discussed.


title: Spin polarized states in strongly asymmetric nuclear matter

abstract:
  In the framework of a Fermi liquid theory it is considered the possibility of
appearance of spin polarized states in strongly asymmetric nuclear matter with
Skyrme effective interaction. The zero temperature dependence of neutron and
proton spin polarization parameters as functions of density is found for SLy4,
SLy5 effective forces. It is shown that at some critical density it will be
formed the state with the oppositely directed spins of neutrons and protons,
while the state with the same direction of spins does not appear. In comparison
with neutron matter, even small admixture of protons strongly decreases the
threshold density of spin instability. It is clarified that protons become
totally polarized within very narrow density domain while in the density
profile of neutron spin polarization parameter their appear long tails near the
transition density.


title: Pion re-scattering in pi0 production near threshold

abstract:
  We compare the most used approximations to calculate the contribution from
pion re-scattering mechanisms to pion production from proton-proton scattering,
near threshold. Our calculation employs a pseudo-vector coupling for the pi NN
vertex and realistic amplitudes for the pi N re-scattering and the NN
transitions.


title:
Nuclear absorption and anomalous $J/\psi$ suppression in Pb+Pb
  collisions

abstract:
  We discuss $J/\psi$ suppression in a QCD based nuclear absorption model.
Centrality dependence of $J/\psi$ suppression in S+U and in Pb+Pb collisions
are explained in the model. However, the model fails to explain the centrality
dependence of $\psi\prime$ suppression. $\psi\prime$ suppression in S+U or in
Pb+Pb collisions require additional suppression. Additional suppression of
$\psi\prime$, due to hadronic comovers or due to QGP formation could not be
distinguished in Pb+Pb collisions. We then show that the centrality dependence
of the ratio, $\psi\prime$ over $J/\psi$, could possibly distinguish two
scenario (e.g. QGP or hadronic comover) at RHIC energy.


title: The heavy-quark hybrid meson spectrum in lattice QCD

abstract:
  Recent findings on the spectrum of heavy-quark mesons from computer
simulations of quarks and gluons in lattice QCD are summarized, with particular
attention to quark-antiquark states bound by an excited gluon field. The
validity of a Born-Oppenheimer treatment for such systems is discussed. Recent
results on glueball masses, the light-quark 1-+ hybrid meson mass, and the
static three-quark potential are summarized.