title: Excitation of soft dipole modes in electron scattering

abstract:
  The excitation of soft dipole modes in light nuclei via inelastic electron
scattering is investigated. I show that, under the proposed conditions of the
forthcoming electron-ion colliders, the scattering cross sections have a direct
relation to the scattering by real photons. The advantages of electron
scattering over other electromagnetic probes is explored. The response
functions for direct breakup are studied with few-body models. The dependence
upon final state interactions is discussed. A comparison between direct breakup
and collective models is performed. The results of this investigation are
important for the planned electron-ion colliders at the GSI and RIKEN
facilities.


title:
Four-Body Bound State Formulation in Three-Dimensional Approach (Without
  Angular Momentum Decomposition)

abstract:
  The four-body bound state with two-body forces is formulated by the
Three-Dimensional approach, which greatly simplifies the numerical calculations
of few-body systems without performing the Partial Wave components. We have
obtained the Yakubovsky equations directly as three dimensional integral
equations.


title: Level statistics of deformed even-even nuclei

abstract:
  The nearest neighbor spacing distribution of levels of deformed even-even
nuclei classified according to their quadrupole deformation parameter is
investigated. The results suggest that the oblate deformed nuclei have more
regular spectra than prolate ones.


title: Lattice QCD Constraints on the Nuclear Equation of State

abstract:
  Based on the quasi-particle description of the QCD medium at finite
temperature and density we formulate the phenomenological model for the
equation of state that exhibits crossover or the first order deconfinement
phase transition. The models are constructed in such a way to be
thermodynamically consistent and to satisfy the properties of the ground state
nuclear matter comply with constraints from intermediate heavy--ion collision
data. Our equations of states show quite reasonable agreement with the recent
lattice findings on temperature and baryon chemical potential dependence of
relevant thermodynamical quantities in the parameter range covering both the
hadronic and quark--gluon sectors. The model predictions on the isentropic
trajectories in the phase diagram are shown to be consistent with the recent
lattice results. Our nuclear equations of states are to be considered as an
input to the dynamical models describing the production and the time evolution
of a thermalized medium created in heavy ion collisions in a broad energy range
from SIS up to LHC.


title: A New Family of Simple Solutions of Perfect Fluid Hydrodynamics

abstract:
  A new class of accelerating, exact and explicit solutions of relativistic
hydrodynamics is found - more than 50 years after the previous similar result,
the Landau-Khalatnikov solution. Surprisingly, the new solutions have a simple
form, that generalizes the renowned, but accelerationless, Hwa-Bjorken
solution. These new solutions take into account the work done by the fluid
elements on each other, and work not only in one temporal and one spatial
dimensions, but also in arbitrary number of spatial dimensions. They are
applied here for an advanced estimation of initial energy density and life-time
of the reaction in ultra-relativistic heavy ion collisions.

categories: nucl-th astro-ph hep-ph nucl-ex physics.flu-dyn


title:
Cold asymmetrical fermion superfluids in nonperturbative renormalisation
  group

abstract:
  The application of the nonperturbative renormalisation group approach to a
system with two fermion species is studied. Assuming a simple ansatz for the
effective action with effective bosons, describing pairing effects we derive a
set of approximate flow equations for the effective coupling including boson
and fermionic fluctuations. The case of two fermions with different masses but
coinciding Fermi surfaces is considered.
  The phase transition to a phase with broken symmetry is found at a critical
value of the running scale. The large mass difference is found to disfavour the
formation of pairs.
  The mean-field results are recovered if the effects of boson loops are
omitted. While the boson fluctuation effects were found to be negligible for
large values of $p_{F} a$ they become increasingly important with decreasing
$p_{F} a$ thus making the mean field description less accurate.


title:
Indications for Cluster Melting from Forward-Backward Charge
  Fluctuations at RHIC Energies

abstract:
  We study forward-backward charge fluctuations to probe the correlations among
produced particles in ultra relativistic heavy ion collisions. We develop a
model that describes the forward-backward dynamical fluctuations and apply it
to interpret the recent PHOBOS data. Within the present model, the dynamical
fluctuations are related to the particle production mechanism via cluster decay
and to long range correlations between the forward and backward rapidity
hemispheres. We argue that with a tight centrality cut, PHOBOS may see a strong
decrease of the dynamical fluctuations. Within the present model, this
deterioration of the correlation among the produced hadrons can be interpreted
as a sign for the production of a hot, dense and interacting medium.


title:
Pairing and continuum effects on low-frequency quadrupole vibrations in
  deformed Mg isotopes close to the neutron drip line

abstract:
  Low-frequency quadrupole vibrational modes in deformed $^{36,38,40}$Mg close
to the neutron drip line are studied by means of the quasiparticle-random-phase
approximation based on the coordinate-space Hartree-Fock-Bogoliubov formalism.
Strongly collective $K^{\pi}=0^{+}$ and $2^{+}$ excitation modes carrying 10-20
Weisskopf units in the intrinsic isoscalar quadrupole transition strengths are
obtained at about 3 MeV. There are two reasons for the enhancement of the
transition strengths. First, the quasiparticle wave functions generating these
modes possess spatially very extended structure. The asymptotic selection rules
characterizing the $\beta$ and $\gamma$ vibrations in stable deformed nuclei
are thus strongly violated. Second, the dynamic pairing effects act strongly to
enhance the collectivity of these modes. It is suggested that the lowest
$K^{\pi}=0^{+}$ collective mode is a particularly sensitive indicator of the
nature of pairing correlations in deformed nuclei close to the neutron drip
line.


title: Dimer scattering in the epsilon expansion

abstract:
  The atom-dimer and dimer-dimer scattering lengths are analytically calculated
in an expansion around four spatial dimensions for fermions with a large 2-body
scattering length 'a'. We find the atom-dimer scattering length a_ad/a =
4/3-2/9 epsilon and the dimer-dimer scattering length a_dd/a = epsilon -0.344
epsilon^2, where epsilon = 4-d and d is the number of spatial dimensions. These
ratios a_ad/a = 1.11 and a_dd/a = 0.656 at epsilon = 1 are to be compared with
the non-perturbatively calculated numerical results 1.18 and 0.6 respectively.
The neutron-deuteron scattering length in the quartet channel a_nD = 4.78 fm is
in reasonable agreement with the experimental value 6.35 fm, considering 2-body
effective range corrections r_0/a = 0.4 were excluded. The deuteron-deuteron
scattering length a_DD = 3.15 fm in the spin-2 channel.


title: Pasta structures in compact stars

abstract:
  We review our recent works about ``pasta'' structures following the
first-order phase transition in dense matter, which correspond to the
structured mixed phases with geometrical symmetries. Three kinds of phase
transitions at different density ranges are examined as the stages of pasta
structures: liquid-gas phase transition at subnuclear density, kaon
condensation and hadron-quark phase transition at high density. Charge density
as well as particle density is non-uniform there. A consistent treatment of the
Coulomb potential and the particle densities is presented and a peculiar role
of the Coulomb potential is elucidated: the physical picture of the Maxwell
construction will be effectively recovered. It largely influences the density
regime of pasta structures by the charge screening effect.


title: The role of $q\bar q$ components in the N(1440) resonance

abstract:
  The role of 5-quark components in the pion and electromagnetic decays and
transition form factors of the N(1440) is explored. The $qqqq\bar q$
components, where the 4-quark subsystem has the flavor-spin symmetries
$[4]_{FS}[22]_F[22]_S$ and $[4]_{FS}[31]_F[31]_S$, which are expected to have
the lowest energy of all $qqqq\bar q$ configurations, are considered in detail
with a nonrelativistic quark model. The matrix elements between the 5-quark
components of the N(1440) and the nucleon, $qqqq\bar q\to qqqq\bar q$, play a
minor role in these decays, while the transition matrix elements $qqqq\bar q\to
qqq$ and $qqq\to qqqq\bar q$ that involve quark antiquark annihilation are very
significant. Both for the electromagnetic and strong decay the change from the
valence quark model value is dominated by the confinement triggered $q\bar q$
annihilation transitions. In the case of pion decay the calculated decay width
is enhanced substantially both by the direct $q\bar q \to \pi$ and also by the
confinement triggered $q\bar q\to \pi$ transitions. Agreement with the
empirical value for the pion decay width may be reached with a $\sim$ 30%
$qqqq\bar q$ component in the N(1440).


title: A note on the Woods-Saxon potential

abstract:
  The wave Schrodinger and, to clarify one interesting point encountered in the
calculations, Klein-Gordon equations are solved exactly for a single neutron
moving in a central Woods-Saxon plus an additional potential that provides a
flexibility to construct the surface structure of the related nucleus. The
physics behind the solutions and the reliability of the results obtained are
discussed carefully with the consideration of other related works in the
literature. In addition, the exhaustive analysis of the results reveals the
fact that the usual Woods-Saxon potential cannot be solved analytically within
the framework of non-relativistic physics, unlike its exactly solvable
relativistic consideration.


title: Pion Deuteron Scattering and Chiral Expansions

abstract:
  We discuss convergence issues as well as short distance constraints on the
deuteron wave functions based on chiral perturbation theory relevant to pion
deuteron scattering. Non-analytical terms arise in the multiple scattering
series for the pion-deuteron scattering length limiting the accuracy of the
calculations. This result resembles similar findings in the structure of the NN
interaction. The effects are found not to be numerically large. The iso-scalar
$\pi N $ scattering length from the iso-vector one and the $\pi d$ scattering
length yields values compatible with the experimental number and with much
smaller errors.


title: Baryonic Strangeness and Related Susceptibilities in QCD

abstract:
  The ratios of off-diagonal to diagonal conserved charge susceptibilities
e.g., chi_{BS}/chi_{S}, chi_{QS}/chi_{S}, related to the quark flavor
susceptibilities, have proven to be discerning probes of the flavor carrying
degrees of freedom in hot strongly interacting matter. Various constraining
relations between the different susceptibilities are derived based on the
Gell-Mann-Nishijima formula and the assumption of isospin symmetry. Using
generic models of deconfined matter and results form lattice QCD, it is
demonstrated that the flavor carrying degrees of freedom at a temperature above
1.5T_c are quark-like quasiparticles. A new observable related by isospin
symmetry to C_{BS} = -3chi_{BS}/chi_{S} and equal to it in the baryon free
regime is identified. This new observable, which is blind to neutral and
non-strange particles, carries the potential of being measured in relativistic
heavy-ion collisions.


title: The entropy of a correlated system of nucleons

abstract:
  Realistic nucleon-nucleon interaction induce correlations to the nuclear
many-body system which lead to a fragmentation of the single-particle strength
over a wide range of energies and momenta. We address the question of how this
fragmentation affects the thermodynamical properties of nuclear matter. In
particular, we show that the entropy can be computed with the help of a
spectral function which can be evaluated in terms of the self-energy obtained
in the Self-Consistent Green's Function approach. Results for the density and
temperature dependences of the entropy per particle for symmetric nuclear
matter are presented and compared to the results of lowest order finite
temperature Brueckner--Hartree--Fock calculations. The effects of correlations
on the calculated entropy are small, if the appropriate quasi-particle
approximation is used. The results demonstrate the thermodynamical consistency
of the self-consistent T-matrix approximation for the evaluation of the Green's
functions.


title: Peripherality of breakup reactions

abstract:
  The sensitivity of elastic breakup to the interior of the projectile wave
function is analyzed. Breakup calculations of loosely bound nuclei (8B and
11Be) are performed with two different descriptions of the projectile. The
descriptions differ strongly in the interior of the wave function, but exhibit
identical asymptotic properties, namely the same asymptotic normalization
coefficient, and phase shifts. Breakup calculations are performed at
intermediate energies (40-70 MeV/nucleon) on lead and carbon targets as well as
at low energy (26 MeV) on a nickel target. No dependence on the projectile
description is observed. This result confirms that breakup reactions are
peripheral in the sense that they probe only the external part of the wave
function. These measurements are thus not directly sensitive to the total
normalization of the wave function, i.e. spectroscopic factor.


title: Extended Partial-Wave Analysis of piN Scattering Data

abstract:
  We present results from a comprehensive partial-wave analysis of pi+-p
elastic scattering and charge-exchange data, covering the region from threshold
to 2.6 GeV in the lab pion kinetic energy, employing a coupled-channel
formalism to simultaneously fit pi-p-->eta n data to 0.8 GeV. Our main result,
solution SP06, utilizes a complete set of forward and fixed-t dispersion
relation constraints applied to the piN elastic amplitude. The results of these
analyses are compared with previous solutions in terms of their resonance
spectra and preferred values for couplings and low-energy parameters.


title:
Parity non-conservation in nuclear excitation by circularly polarized
  photon beam

abstract:
  We show that the asymmetries in the nuclear resonance fluorescence processes
with a circular polarized photon beam may be used as a tool for studying the
parity non-conservation (PNC) in nuclei. The PNC asymmetry measurements both in
exciting the parity doublet states and in exciting the discrete states near the
ground states with parity mixing are discussed. We derived the formulae needed
for measuring the PNC asymmetries.


title:
Heavy-ion interaction potential deduced from density-constrained TDHF
  calculation

abstract:
  We present a new method for calculating the heavy-ion interaction potential
from a density-constrained time-dependent Hartree-Fock calculation.


title:
Quantum effects in the diffusion process to form a heavy nucleus in
  heavy-ion fusion reactions

abstract:
  We discuss quantum effects in the diffusion process which is used to describe
the shape evolution from the touching configuration of fusing two nuclei to a
compound nucleus. Applying the theory with quantum effects to the case where
the potential field, the mass and friction parameters are adapted to realistic
values of heavy-ion collisions, we show that the quantum effects play
significant roles at low temperatures which are relevant to the synthesis of
superheavy elements.


title:
Muon capture on nuclei: random phase approximation evaluation versus
  data for 6 $\le$ Z $\le$ 94 nuclei

abstract:
  We use the random phase approximation to systematically describe the total
muon capture rates on all nuclei where they have been measured. We reproduce
the experimental values on these nuclei to better than 15% accuracy using the
free nucleon weak form factors and residual interactions with a mild $A$
dependency. The isospin dependence and the effects associated with shell
closures are fairly well reproduced as well. However, the calculated rates for
the same residual interactions would be significantly lower than the data if
the in-medium quenching of the axial-vector coupling constant is employed to
other than the true Gamow-Teller amplitudes. Our calculation thus suggests that
no quenching is needed in the description of semileptonic weak processes
involving higher multipole transitions and momentum transfer $\sim m_{\mu}$,
with obvious importance to analogous weak processes.


title:
Double neutron-proton differential transverse flow as a probe for the
  high-density behavior of the nuclear symmetry energy

abstract:
  The double neutron-proton differential transverse flowtaken from two reaction
systems using different isotopes of the same element is studied at incident
beam energies of 400 and 800 MeV/nucleon within the framework of an isospin-
and momentum-dependent hadronic transport model IBUU04. The double differential
flow is found to retain about the same sensitivity to the density dependence of
the nuclear symmetry energy as the single differential flow in the more
neutron-rich reaction. Because the double differential flow reduces
significantly both the systematic errors and the influence of the Coulomb
force, it is thus more effective probe for the high-density behavior of the
nuclear symmetry energy.


title:
Elliptic flow and system size dependence of transition energies at
  intermediate energies

abstract:
  The elliptic flow for $Z\le2$ particles in heavy ion collisions at energies
from several tens to several hundreds MeV per nucleon is investigated by means
of transport model,i.e. a new version of the Improved Quantum Molecular
Dynamics model (ImQMD05). In this model, a complete Skyrme potential energy
density functional is employed. The influence of different effective
interactions and medium corrections of nucleon-nucleon cross sections on the
elliptic flow are studied. Our results show that a soft nuclear equation of
state and incident energy dependent in-medium nucleon-nucleon cross sections
are required for describing the excitation function of the elliptic flow at
intermediate energies. The size dependence of transition energies for the
elliptic flow at intermediate energies is also studied. The system size
dependence of transition energies fits a power of system size with a exponent
of 0.223.


title:
Quasiclassical description of bremsstrahlung accompanying alpha decay
  including quadrupole radiation

abstract:
  We present a quasiclassical theory of alpha decay accompanied by
bremsstrahlung with a special emphasis on the case of 210Po, with the aim of
finding a unified description that incorporates both the radiation during the
tunneling through the Coulomb wall and the finite energy E_gamma of the
radiated photon up to E_gamma on the order of Q_alpha/sqrt(eta), where Q_alpha
is the alpha-decay Q-value and eta is the Sommerfeld parameter. The corrections
with respect to previous quasiclassical investigations are found to be
substantial, and excellent agreement with a full quantum mechanical treatment
is achieved. Furthermore, we find that a dipole-quadrupole interference
significantly changes the alpha-gamma angular correlation. We obtain good
agreement between our theoretical predictions and experimental results.


title: The Three-Nucleon System at Next-To-Next-To-Leading Order

abstract:
  We calculate higher order corrections for the three-nucleon system up to
next-to-next-to-leading within an effective field theory with contact
interactions alone. We employ a subtraction formalism previously developed and
for which it has been shown that no new three-body force counterterm is needed
for complete renormalization up to this order. We give results for the
neutron-deuteron phaseshifts and the triton binding energy. Our results are in
very good agreement with experimental results and calculations using realistic
nucleon-nucleon potentials.


title: Collective Flow in Heavy-Ion Collisions from AGS to SPS

abstract:
  Collective transverse flow in heavy-ion collisions at incident energies
E_{lab} = (1 -160)A GeV is analyzed within the model of 3-fluid dynamics (3FD).
Simulations are performed with purely hadronic equation of state (EoS). At the
AGS energies the flow turns out to be sensitive to the stopping power of
nuclear matter rather than only to the stiffness of the EoS. When the stopping
power is fixed to reproduce other observables, the flow data favor more and
more soft EoS with the incident energy rise, which can be associated with ``a
transition from hadronic to string matter'' reported in the
Hadron-String-Dynamics (HSD) model. Problems, which are met in simultaneous
reproduction of directed and elliptic flows within the 3FD, suggest that the
transverse flow is very sensitive to the character of the transverse-momentum
nonequilibrium at the initial stage of collision. Arguments in favor of
"early-stage" nature of the flow observable are put forward. This suggests that
the flow (especially the directed one) is determined by early-stage evolution
of the collision rather than freeze-out stage.


title:
On details of implementation of Orthogonality Condition Model with
  dynamic exclusion of forbidden two-body states for description of 12C as
  system of three clusters

abstract:
  3-alpha cluster model with dynamic exclusion of forbidden by Pauli principle
two-body states is studied. We implement this model by step-by-step inclusion
of components of prescribed by the model Hamiltonian, carefully studying
intermediate results, and behavior of obtained solutions. A few qualified
modifications are introduced in order to significantly simplify necessary
computational schema.


title:
Resonances and fluctuations of strange particle in 200 GeV Au-Au
  collisions

abstract:
  We perform an analysis of preliminary data on strange particles yields and
fluctuations within the Statistical hadronization model. We begin by describing
the theoretical disagreements between different statistical models currently on
the market. We then show how the simultaneous analysis of yields and
fluctuations can be used to differentiate between the different models, and
determine if one of them can be connected to underlying physics. We perform a
study on a RHIC 200 GeV data sample that includes stable particles, resonances,
and the event-by-event fluctuation of the $K/\pi$ ratio. We show that the
equilibrium statistical model can not describe the fluctuation, unless an
unrealistically small volume is assumed. Such small volume then makes it
impossible to describe the total particle multiplicity. The non-equilibrium
model,on the other hand, describes both the $K/\pi$ fluctuation and yields
acceptably due to the extra boost to the $\pi$ fluctuation provided by the high
pion chemical potential. $\Lambda(1520)$ and $K^*$ abundance is described
within error bars, but the $\Sigma^*$ is under-predicted to $\sim$ 1.5 standard
deviations. We suggest further measurements that have the potential to test the
non-equilibrium model, as well as gauge the effect of re-interactions between
hadronization and freeze-out.


title: Collisional Energy Loss of Non Asymptotic Jets in a QGP

abstract:
  We calculate the collisional energy loss suffered by a heavy (charm) quark
created at a finite time within a Quark Gluon Plasma (QGP) in the classical
linear response formalism as in Peigne {\it et al.} \cite{peigne}. We pay close
attention to the problem of formulating a suitable current and the isolation of
binding and radiative energy loss effects. We find that unrealistic large
binding effects arising in previous formulations must be subtracted. The finite
time correction is shown to be important only for very short length scales on
the order of a Debye length. The overall energy loss is similar in magnitude to
the energy loss suffered by a charge created in the asymptotic past. This
result has significant implications for the relative contribution to energy
loss from collisional and radiative sources and has important ramifications for
the ``single electron puzzle'' at RHIC.


title: Sub-barrier Fusion Cross Sections with Energy Density Formalism

abstract:
  We discuss the applicability of the energy density formalism (EDF) for
heavy-ion fusion reactions at sub-barrier energies. For this purpose, we
calculate the fusion excitation function and the fusion barrier distribution
for the reactions of $^{16}$O with $^{154,}$$^{144}$Sm,$^{186}$W and $^{208}$Pb
with the coupled-channels method. We also discuss the effect of saturation
property on the fusion cross section for the reaction between two $^{64}$Ni
nuclei, in connection to the so called steep fall-off phenomenon of fusion
cross sections at deep sub-barrier energies.


title: Simultaneous description of four positive and four negative parity bands

abstract:
  The extended coherent state model is further extended in order to describe
two dipole bands of different parities. The formalism provides a consistent
description of eight rotational bands. A unified description for spherical,
transitional and deformed nuclei is possible. Projecting out the angular
momentum and parity from a sole state, the $K^{\pi}=1^+$ band acquires a
magnetic character, while the electric properties prevail for the other band.
Signatures for a static octupole deformation in some states of the dipole bands
are pointed out. Some properties which distinguish between the dipole band
states and states of the same parity but belonging to other bands are
mentioned. Interesting features concerning the decay properties of the two
bands are found. Numerical applications are made for $^{158}$Gd, $^{172}$Yb,
$^{228,232}$Th, $^{226}$Ra, $^{238}$U and $^{238}$Pu, and the results are
compared with the available data.


title: Progress in lattice QCD at finite temperature

abstract:
  I review current status of lattice QCD calculations of the deconfining
transition at finite temperature and quarkonia spectral functions.


title:
Deuteron photodisintegration with polarized photons at astrophysical
  energies

abstract:
  Following precise experimental studies at the Duke Free-Electron Laser
Laboratory, we discuss photodisintegration of deuterons with 100% linearly
polarized photons using a model independent theoretical approach taking
together $M1$ and $E1$ amplitudes simultaneously. The isoscalar $M1_s$
contribution is also taken exactly into account. From the existing experimental
measurement on doubly polarized thermal neutron capture, it is seen that the
isoscalar $M1_s$ contribution could be of the same order of magnitude as the
experimentally measured cross sections at energies relevant to Big Bang
Nucleosynthesis (BBN). Therefore appropriate measurements on deuteron
photodisintegration are suggested to empirically determine the $M1_s$
contribution at astrophysical energies.


title: The imaginary part of the gap function in color superconductivity

abstract:
  We clarify general properties of the energy gap regarding its functional
dependence on the energy-momentum dictated by the invariance under a space
inversion or a time reversal. Then we derive perturbatively the equation of the
imaginary part of the gap function for dense QCD in weak coupling and
generalize our results from 2SC case to CFL case. We confirm that the imaginary
part is down by $g$ relative to the real part in weak coupling. The numerical
results show that, up to the leading order, the imaginary part is no larger
than one MeV at extremely large densities and can be as large as several MeV
the densities are of physical interest.


title: Twice-iterated boson-exchange scattering amplitudes

abstract:
  We calculate at two-loop order the complex-valued scattering amplitude
related to the twice-iterated scalar-isovector boson-exchange between nucleons.
In comparison to the once-iterated boson-exchange amplitude it shows less
dependence on the scattering angle. We calculate also the iteration of the
(static) irreducible one-loop potential with the one-boson exchange and find
similar features. Together with the irreducible three-boson exchange potentials
and the two-boson exchange potentials with vertex corrections, which are also
evaluated analytically, our results comprise all nonrelativistic contributions
from scalar-isovector boson-exchange at one- and two-loop order. The applied
methods can be straightforwardly adopted to the pseudoscalar pion with its
spin- and momentum-dependent couplings to the nucleon.


title: A first estimation of chiral four-nucleon force effects in 4He

abstract:
  We estimate four-nucleon force effects between different 4He wave functions
by calculating the expectation values of four-nucleon potentials which were
recently derived within the framework of chiral effective field theory. We find
that the four-nucleon force is attractive for the wave functions with a totally
symmetric momentum part. The additional binding energy provided by the
long-ranged part of the four-nucleon force is of the order of a few hundred
keV.


title:
Effects of the $\gamma-$rays Scattered Backward by Metals on the Nuclear
  Energy Level Width

abstract:
  By placing a ${}^{133}Cs$ $\gamma$-ray source embedded in a solid at the
center of a platinum (gold) cylinder, we try to change the width of the 81-keV
level. Our results show a narrowed energy level and, equivalently, a prolonged
lifetime. With a 0.5-mm-thick, 5-cm-long, 2-mm-diameter platinum cylinder, we
obtain a width narrower by $6.1 % $ at $4.2 \: K$.


title: From Trapped Atoms to Liberated Quarks

abstract:
  We discuss some aspects of cold atomic gases in the unitarity limit that are
of interest in connection with the physics of dense hadronic matter. We
consider, in particular, the equation of state at zero temperature, the
magnitude of the pairing gap, and the phase diagram at non-zero polarization.


title: A Calculation of the Sigma Meson Mass in Nuclear Matter

abstract:
  We calculate the mass and width of the sigma meson in nuclear medium by
considering that it couples to two virtual pions and to a pair of
nucleon-antinucleon states and to particle-hole states. The mass is calculated
by using the spectral function in the Walecka model, finding that it is about
380MeV. In addition, we obtain the value of 340MeV for the width of its
spectral function. We find that there is a reduction in the mass value compared
with that in vacuum. This result is consistent with those reported by other
authors who have used different models predicting a decreasing of the mass as a
function of the density.


title: Nucleon-deuteron capture with chiral potentials

abstract:
  Present day chiral nucleon-nucleon potentials up to N3LO and three nucleon
forces at N2LO are used to analyze nucleon-deuteron radiative capture at
deuteron lab energies below E_d= 100 MeV. The differential cross section and
the deuteron analyzing powers A_y(d) and A_{yy} are presented and compared to
data. The theoretical predictions are obtained in the momentum-space Faddeev
approach using the nuclear electromagnetic current operator with exchange
currents introduced via the Siegert theorem. The chiral forces provide the same
quality of data description as a combination of the two-nucleon AV18 and the
three-nucleon Urbana IX interactions. However, the different parametrizations
of the chiral potentials lead to broad bands of predictions.


title:
Toward the energy and the system size dependece of elliptic flow:
  working on flow fluctuations

abstract:
  In this talk I concentrate on two topics closely related to the understanding
of the energy and the system size dependence of the elliptic flow:
determination of the elliptic flow ($v_2$) ``free'' from the effects of
non-flow and flow fluctuations, and the role of fluctuations in the initial
eccentricity of the overlap region. I introduce a new approach for the analysis
of the distribution in flow vector, $dP/dq_n$, namely, I propose to use the
Bessel Transform of this ditribution. I show that the Bessel Transform method
is similar to the Lee-Yang Zeroes method, and is very transparent in its
meaning and applications.


title:
Shell model study of $^{40}$Ca muon capture and the $(0^+,
  0)$$\to$$(0^-, 2626)$ axial charge transition

abstract:
  We report results from shell model studies of muon capture on $^{40}$Ca to
low-lying levels of $^{40}$K. We discuss the comparison between calculated
capture rates, measured capture rates and analogous transitions in
($e$,$e^{\prime}$) scattering in terms of the particle-hole structure of the
$^{40}$Ca-$^{40}$K nuclei. We highlight the $^{40}$Ca$(0^+,
0)$$\to$$^{40}$K$(0^-, 2626)$ axial charge transition and its sensitivity to
the induced pseudoscalar coupling $g_p$ of the proton's weak interaction. In
addition, we address the hindrance of unique first-forbidden transitions due to
particle-hole interactions and the emergence of allowed Gamow-Teller
transitions due to ground state correlations. Lastly, we examine the
longitudinal alignment of $^{40}$K recoils following muon capture, and discuss
this possibility for independently determining the induced coupling $g_p$.


title: Structure properties of even-even actinides

abstract:
  Structure properties of fifty five even-even actinides have been calculated
using the Gogny D1S force and the Hartree-Fock-Bogoliubov approach as well as
the configuration mixing method. Theoretical results are compared with
experimental data.


title: Theoretical study of one-proton removal from 15O

abstract:
  One-proton removal from 15O at intermediate energies (56 A MeV) is studied in
the eikonal approximation of the Glauber model. The production of the 14N core
fragment in the ground and excited states is regarded. The calculated proton
removal cross section, the 15O interaction cross section, and the longitudinal
momentum distribution of the 14N fragments are compared to recent experimental
data [1].
  [1] H. Jeppesen, R. Kanungo, B. Abu-Ibrahim it et al, Nucl. Phys. A 739, 57
(2004).


title: Renormalization group analysis of nuclear current operators

abstract:
  A Wilsonian renormalization group (WRG) equation for nuclear current
operators in two-nucleon systems is derived. Nuclear current operators relevant
to low-energy Gamow-Teller transitions are analyzed using the WRG equation. We
employ the axial two-body current operators from phenomenological models and
heavy-baryon chiral perturbation theory, which are quite different from one
another in describing small scale physics. After reducing the model space of
the operators using the WRG equation, we find that there still remains a
significant model dependence at \Lambda = 200 MeV, where \Lambda is the sharp
cutoff specifying the size of the model space. A model independent effective
current operator is found at a rather small cutoff value, \Lambda = 70 MeV. By
simulating the effective current operator at \Lambda=70 MeV, we obtain a
current operator based on a pionless theory, thereby arguing an equivalence
relation between nuclear current operators of phenomenological models and those
of effective field theories.


title:
On the possibility of a discontinuous quark-mass dependence of baryon
  octet and decuplet masses

abstract:
  We compute the quark-mass dependence of the baryon octet and decuplet masses
within the $\chi$-MS scheme at the one-loop level. The results are confronted
with recent lattice QCD simulations of the MILC collaboration. A fair
reproduction of the quark-mass dependence as suggested by the lattice
simulations is obtained up to pion masses of about 700 MeV. Based on the chiral
one-loop results we predict that the dependence of the baryon octet and
decuplet masses on the quark-masses is discontinuous. Typically the pion-mass
dependence is smooth up to about 300 MeV only. This is a consequence of self
consistency imposed on the partial summation, i.e. the masses used in the loop
functions are identical to those obtained from the baryon self energies. The
'mysterious' quark-mass dependence of the Xi mass predicted by the MILC
collaboration is recovered in terms of a discontinuous chiral extrapolation.


title: Small eta-N scattering lengths favour eta-d and eta-alpha states

abstract:
  Unstable states of the eta meson and the 3He nucleus predicted using the time
delay method were found to be in agreement with a recent claim of eta-mesic 3He
states made by the TAPS collaboration. Here, we extend this method to a
speculative study of the unstable states occurring in the eta-d and eta-4He
elastic scattering. The T-matrix for eta-4He scattering is evaluated within the
Finite Rank Approximation (FRA) of few body equations. For the evaluation of
time delay in the eta-d case, we use a parameterization of an existing Faddeev
calculation and compare the results with those obtained from FRA. With an eta-N
scattering length, $a_{\eta N} = (0.42, 0.34)$ fm, we find an eta-d unstable
bound state around -16 MeV, within the Faddeev calculation. A similar state
within the FRA is found for a low value of $a_{\eta N}$, namely, $a_{\eta N} =
(0.28, 0.19)$ fm. The existence of an eta-4He unstable bound state close to
threshold is hinted by $a_{\eta N} = (0.28, 0.19)$ fm, but is ruled out by
large scattering lengths.


title: A pure S-wave covariant model for the nucleon

abstract:
  Using the manifestly covariant spectator theory, and modeling the nucleon as
a system of three constituent quarks with their own electromagnetic structure,
we show that all four nucleon electromagnetic form factors can be very well
described by a manifestly covariant nucleon wave function with zero orbital
angular momentum. Since the concept of wave function depends on the formalism,
the conclusions of light-cone theory requiring nonzero angular momentum
components are not inconsistent with our results. We also show that our model
gives a qualitatively correct description of deep inelastic scattering,
unifying the phenomenology at high and low momentum transfer. Finally we review
two different definitions of nuclear shape and show that the nucleon is
spherical in this model, regardless of how shape is defined.


title: Box diagram in the elastic electron-proton scattering

abstract:
  We present an evaluation of box diagram for the elastic $ep$ scattering with
proton in the intermediate state. Using analytic properties of the proton form
factors we express the amplitude via twofold integral, which involves the form
factors in the space-like region only. Therefore experimentally measured form
factors can be used in the calculations directly. The numerical calculation is
done with the form factors extracted by Rosenbluth, as well as by polarization
transfer methods. The dependence of the results on the form factor choice is
small for $Q^2 < 6 GeV^2$, but becomes sizable at higher $Q^2$.


title: Parameterization of the phase shift D33 for Pi-N Scattering

abstract:
  From the partial wave analysis, the phase shift D33 of pion nucleon
scattering containing the D(1232) resonance, corresponding to isospin I=3/2 and
angular momentum J=3/2, has been parameterized over the energy range 1100 < W <
1375 MeV, using p-Pi+ data. The result of our parameterization shows good
agreement in comparison with the available experimental data.


title:
Incoherent single pion electroproduction on the deuteron with
  polarization effects

abstract:
  Incoherent pion electroproduction on the deuteron is studied from threshold
up to the second resonance region with special emphasis on the influence of
final state interaction, in particular on polarization observables. The
elementary $\gamma N\to\pi N$ amplitude is taken from the MAID-2003 model.
Final state interaction is included by considering complete rescattering in the
final $NN$ and $\pi N$ subsystems. Their influence on the structure functions
governing the semi-exclusive differential cross section, where besides the
scattered electron only the produced pion is detected, is investigated in
detail. For charged pion-production the effect of $NN$-rescattering is moderate
whereas $\pi N$-rescattering is almost negligible, except very close to
threshold. $NN$-rescattering appears much stronger in neutral pion production
for which the primary mechanism is the elimination of a significant spurious
coherent contribution in the impulse approximation. Sizeable effects are also
found in some of the polarization structure functions for beam and/or target
polarizations.


title: A study of elliptic flows in a quark combination model

abstract:
  We carry out a detail study of elliptic flows in Au-Au collisions at 200 AGeV
in a quark combination model. We find that elliptic flow data for a variety of
hadrons can be well reproduced except pions if constituent quarks with equal
parallel transverse momenta combine into initially produced hadrons. In a
combination mechanism where initial hadrons are formed by quarks with unequal
parallel transverse momenta, theoretical predictions agree with data for all
available hadrons including pions. The mass hierarchy at low transverse momenta
in elliptic flows can be understood in the same quark combination mechanism as
in the mediate range of transverse momenta.


title: Isospin fractionation : equilibrium versus spinodal decomposition

abstract:
  This paper focuses on the isospin properties of the asymmetric nuclear-matter
liquid-gas phase transition analyzed in a mean-field approach, using Skyrme
effective interactions. We compare two different mechanisms of phase separation
for low-density matter: equilibrium and spinodal decomposition. The isospin
properties of the phases are deduced from the free-energy curvature, which
contains information both on the average isospin content and on the system
fluctuations. Some implications on experimentally accessible isospin
observables are presented.


title: The nuclear AC-Stark shift in super-intense laser fields

abstract:
  The direct interaction of super-intense laser fields in the optical frequency
domain with nuclei is studied. As main observable, we consider the nuclear
AC-Stark shift of low-lying nuclear states due to the off-resonant excitation
by the laser field. We include the case of accelerated nuclei to be able to
control the frequency and the intensity of the laser field in the nuclear rest
frame over a wide range of parameters. We find that AC-Stark shifts of the same
order as in typical quantum optical systems relative to the respective
transition frequencies are feasible with state-of-the-art or near-future laser
field intensities and moderate acceleration of the target nuclei. Along with
this shift, we find laser-induced modifications to the proton root-mean-square
radii and to the proton density distribution. We thus expect direct
laser-nucleus interaction to become of relevance together with other
super-intense light-matter interaction processes such as pair creation.


title: Multiplicity Fluctuations in Hadron-Resonance Gas

abstract:
  The charged hadron multiplicity fluctuations are considered in the canonical
ensemble. The microscopic correlator method is extended to include three
conserved charges: baryon number, electric charge and strangeness. The
analytical formulae are presented that allow to include resonance decay
contributions to correlations and fluctuations. We make the predictions for the
scaled variances of negative, positive and all charged hadrons in the most
central Pb+Pb (Au+Au) collisions for different collision energies from SIS and
AGS to SPS and RHIC.


title: Some challenges for Nuclear Density Functional Theory

abstract:
  We discuss some of the challenges that the DFT community faces in its quest
for the truly universal energy density functional applicable over the entire
nuclear chart.


title: A new variable in flow analysis

abstract:
  We have used a simple spectrum distribution which was derived from a
hydrodynamical equation\cite{Csorgo} to fit the data of the STAR group. It is
found that it can fit the $v_2$ of STAR group very well. We have found that
$v_2$ is sensitive to both the effective temperature of particles and the
expanding velocity. We have suggested a new variable ${\bf z}$ to be used in
the flow analysis. This new variable will measure the correlation of particles
momentum components. We have also shown that one of the $x$ or $y$ direction in
the reaction plane is the direction which has the largest variance.


title:
J/psi production from charm coalescence in relativistic heavy ion
  collisions

abstract:
  J/psi production and collective flow is studied with a coalescence model
based on phase space distribution of charm quarks from a multi-phase transport
model simulation of relativistic heavy ion collisions. Both the yield and the
flow of J/psi particles are sensitive to charm quark final state interactions.
As the charm quark rescattering cross section increases from 3 mb to 10 mb,
J/psi elliptic flow increases faster than corresponding light hadron elliptic
flows. The v_2(p_t) of J/psi crosses that of D mesons to reach a value that is
about the peak value of the D meson flow but at a higher p_t. As J/psi elliptic
flow has only contributions from charm quarks, it complements D meson elliptic
flow in reflecting charm properties in the Quark-Gluon Plasma.


title:
Time-odd triaxial relativistic mean field approach for nuclear magnetic
  moments

abstract:
  The time-odd triaxial relativistic mean field approach is developed and
applied to the investigation of the ground-state properties of light odd-mass
nuclei near the double-closed shells. The nuclear magnetic moments including
the isoscalar and isovector ones are calculated and good agreement with Schmidt
values is obtained. Taking $^{17}$F as an example, the splitting of the single
particle levels (around $~0.7$ MeV near the Fermi level), the nuclear current,
the core polarizations, and the nuclear magnetic potential, i.e., the spatial
part of the vector potential, due to the violation of the time reversal
invariance are investigated in detail.


title: Toy model of the Nucleon - Nucleon potential

abstract:
  We start from a system of six interacting constituent quarks and examine how
the picture of two nucleons can change when substructure of the nucleons are
taken into account.


title:
Nuclear effects on lepton polarization in charged-current quasielastic
  neutrino scattering

abstract:
  We use a correlated local Fermi gas (LFG) model, which accounts also for long
distance corrections of the RPA type and final-state interactions, to compute
the polarization of the final lepton in charged-current quasielastic neutrino
scattering. The present model has been successfully used in recent studies of
inclusive neutrino nucleus processes and muon capture. We investigate the
relevance of nuclear effects in the particular case of $\tau$ polarization in
tau-neutrino induced reactions for several kinematics of relevance for neutrino
oscillation experiments.


title: Diquark Bose-Einstein Condensation and Nuclear Matter

abstract:
  We study a possible transition between symmetric nuclear matter and the
diquark Bose-Einstein condensate (BEC) matter at zero temperature. We find that
chiral restoration transition is first order and coincides with deconfinement.
We investigate various possible coexistence patterns which may emerge from the
first order deconfinement phase transition by assuming different values for the
critical deconfinement chemical potential. If deconfinement takes place at
higher chemical potential, there exists a mixed phase of nuclear and chirally
restored diquark BEC matter. This coexistence region extends over a large
density region for a bigger diquark BEC or a weaker diquark-diquark
interaction. For model parameters with heavy diquark in vaccum, phase
transition to diquark matter becomes of second-order. We also show that in the
case of precocious deconfinement, droplets of nucleons and droplets of chirally
restored Bose-Einstein condensed diquarks coexist surrounded by non-trivial
vacuum. We show that a early deconfinement and a weak repulsive diquark-diquark
interaction soften the equation of state. We propose a scenario in which
nuclear matter saturates due to the formation of the diquark BEC and
deconfinement phenomena. In this picture, instead of repulsive vector-meson
exchange the compressibility of the equation of state is related to a repulsive
diquark-diquark interaction. In general, we emphasize the importance of a
diquark BEC phase at rather low density before quark BCS-pairing transition.


title: Phi-meson photoproduction from nuclei

abstract:
  We study coherent and incoherent phi-meson photoproduction from nuclei. The
available data are analyzed in terms of single and coupled channel
photoproduction. It is found that the data on coherent photoproduction can be
well reproduced within a single channel optical model and show only little room
for omega-phi mixing. These data indicate a normal distortion of the phi-meson
in nuclei, which is compatible with the results obtained through the vector
meson dominance model. The data on incoherent phi-meson photoproduction show an
anomalous A-dependence resulting in a very strong phi-meson distortion. These
data can be explained by a coupled channel effect through the dominant
contribution from the omega -> phi or pi -> phi transition or, more
speculative, through the excitation of a cryptoexotic B_phi-baryon.


title: Two-Pion Exchange in Proton-Proton Scattering

abstract:
  The contribution of the box and crossed two-pion-exchange diagrams to
proton-proton scattering at 90$^{\circ}_{c.m.}$ is calculated in the laboratory
momentum range up to 12 GeV/c. Relativistic form factors related to the nucleon
and pion size and representing the pion source distribution based on the quark
structure of the hadronic core are included at each vertex of the pion-nucleon
interaction. These form factors depend on the four-momenta of the exchanged
pions and scattering nucleons. Feynman-diagram amplitudes calculated without
form factors are checked against those derived from dispersion relations. In
this comparison, one notices that a very short-range part of the crossed
diagram, neglected in dispersion-relation calculations of the two-pion-exchange
nucleon-nucleon potential, gives a sizable contribution. In the Feynman-diagram
calculation with form factors the agreement with measured spin-separated cross
sections, as well as amplitudes in the lower part of the energy range
considered, is much better for pion-nucleon pseudo-vector vis \`a vis
pseudo-scalar coupling. While strengths of the box and crossed diagrams are
comparable for laboratory momenta below 2 GeV/c, the crossed diagram dominates
for larger momenta, largely due to the kinematics of the crossed diagram
allowing a smaller momentum transfer in the nucleon center of mass. An
important contribution arises from the principal-value part of the integrals
which is non-zero when form factors are included. It seems that the importance
of the exchange of color singlets may extend higher in energy than expected.


title:
Locating strongly coupled color superconductivity using universality and
  experiments with trapped ultracold atoms

abstract:
  Cold fermionic atoms are known to enter the universal strongly coupled regime
as their scattering length $a$ gets large compared to the inter-particle
distances. Recent experimental data provide important critical parameters of
such system. We argue that quarks may enter the same regime due to marginal
binding of diquarks, and if so one can use its universality in order to deduce
such properties as the slope of the critical line of color superconductivity,
  $dT_c/d\mu$. We further discuss limitations on the critical temperature
itself and conclude that it is limited by $T_c<70\, MeV$.


title:
Baryon Number and Electric Charge Fluctuations in Pb+Pb Collisions at
  SPS energies

abstract:
  Event-by-event fluctuations of the net baryon number and electric charge in
nucleus-nucleus collisions are studied in Pb+Pb at SPS energies within the HSD
transport model. We reveal an important role of the fluctuations in the number
of target nucleon participants. They strongly influence all measured
fluctuations even in the samples of events with rather rigid centrality
trigger. This fact can be used to check different scenarios of nucleus-nucleus
collisions by measuring the multiplicity fluctuations as a function of
collision centrality in fixed kinematical regions of the projectile and target
hemispheres. The HSD results for the event-by-event fluctuations of electric
charge in central Pb+Pb collisions at 20, 30, 40, 80 and 158 A GeV are in a
good agreement with the NA49 experimental data and considerably larger than
expected in a quark-gluon plasma. This demonstrate that the distortions of the
initial fluctuations by the hadronization phase and, in particular, by the
final resonance decays dominate the observable fluctuations.


title: Effects of deformation in the three-body structure of 11Li

abstract:
  11Li is studied within a three-body model 9Li+n+n where the core is allowed
to be deformed and/or excite. In particular, we include reorientation couplings
and couplings between the two bound states of 9Li. Contrary to the other
examples studied within this model, we find that core excitation does not
affect the structure of 11Li significantly. Reorientation couplings of the
deformed 9Li can change the ground state of 11Li from a predominantly two
neutron s1/2^2 configuration into a p1/2^2. In addition, we see no evidence for
the existence of significant d-wave strength in its ground state, as opposed to
the prediction by shell model. A comparison with shell model is presented.


title: Projector operators for the no-core shell model

abstract:
  Projection operators for the use within ab initio no-core shell model, are
suggested.


title:
Positivity Constraints on Spin Observables in Exclusive Pseudoscalar
  Meson Photoproduction

abstract:
  Positivity constraints have proved to be important for spin observables of
exclusive reactions involving polarized initial and final particles. Attention
is focused in this note on the photoproduction of pseudoscalar mesons from spin
1/2 baryons, more specifically gamma+ N -> K+ Lambda, gamma+ N -> K Sigma, for
which new experimental data are becoming available.


title:
Effect of equilibrium phase transition on multiphase transport in
  relativistic heavy ion collisions

abstract:
  The hadronization scheme for parton transport in relativistic heavy ion
collisions is considered in detail. It is pointed out that the traditional
scheme for particles being freezed out one by one leads to serious problem on
unreasonable long lifetime for partons. A super-cooling of the parton system
followed by a collective phase transition is implemented in a simple way. It
turns out that the modified model with a global phase transition is able to
reproduce the experimental longitudinal distributions of final state particles
better than the original one does. The encouraging results indicate that a
relevant parton transport model for relativistic heavy ion collision should
take equilibrium phase transition into proper account.


title: \eta- and \eta'-mesic nuclei and U_A(1) anomaly at finite density

abstract:
  We discuss theoretically the possibility of observing the bound states of the
\eta and \eta'(958) mesons in nuclei. We apply the NJL model to study the \eta
and \eta' meson properties at finite density and calculate the formation cross
sections of the \eta and \eta' bound states with the Green function method for
(\gamma,p) reaction. We also discuss the experimental feasibility at photon
facilities like SPring-8. The contributions due to the \omega meson production
are also included to obtain the realistic (\gamma,p) spectra. We conclude that
we can expect to observe resonance peaks in (\gamma,p) spectra for the
formation of meson bound states and we can deduce new information on \eta and
\eta' properties at finite density. These observations are believed to be
essential to know the possible mass shift of \eta' and deduce new information
on the effective restoration of the U_A(1) anomaly in the nuclear medium.


title:
Alpha Cluster Structure and Exotic States in a Self-Consistent Model for
  Light Nuclei

abstract:
  In this paper we examine to what extent traces of alpha-clustering can be
found in mean-field ground states of $n\alpha$-nuclei from Be8 through Ar36 as
well as in some superdeformed states in S32, Ar36, and Ca40. For this purpose
we calculate the overlap of the mean-field Slater determinant with one containg
pure Gaussians and perfect spin and isospin symmetry, optimizing the overlap by
varying the alpha-particle positions and radii. In some cases a coherent sum
over different configurations is also employed. We find quite large overlaps
for some of the lighter systems that diminish for nuclei above Ne20 but again
strong clustering in Ar36.


title:
Relativistic QRPA description of isoscalar compression modes in
  open-shell nuclei in the A$\approx$60 mass region

abstract:
  Very recent inelastic $\alpha$-scattering data on the isoscalar monopole and
dipole strength distributions in $^{56}$Fe, $^{58}$Ni, and $^{60}$Ni are
analyzed in the relativistic quasiparticle random-phase approximation (RQRPA)
with the DD-ME2 effective nuclear interaction (nuclear matter compression
modulus K$_{nm}= 251$ MeV). In all three nuclei the calculation nicely
reproduces the observed asymmetric shapes of the monopole strength, and the
bimodal structure of the dipole strength distributions. The calculated centroid
and mean energies are in very good qualitative agreement with the experimental
values both for the monopole, and for the low- and high-energy components of
the dipole transition strengths. It is noted, however, that while DD-ME2
reproduces in detail the excitation energies of the giant monopole resonances
(GMR) in nuclei with $A \ge 90$, the theoretical centroids are systematically
above the experimental values in lighter nuclei with $A \leq 60$. The latter
can be reproduced with an effective interaction with a lower value of K$_{nm}
\approx $ 230 MeV but, because of the asymmetric shapes and pronounced
fragmentation of the monopole strength distributions, isoscalar GMR data in
light nuclei cannot provide accurate estimates of the nuclear matter
compression modulus.


title: Kinetic Description of a Finite Temperature Meson Gas

abstract:
  A transport model based on the mean free path approach for an interacting
meson system at finite temperatures is discussed. A transition to a quark gluon
plasma is included within the framework of the bag model. We discuss some
calculations for a pure meson gas where the Hagedorn limiting temperature is
reproduced when including the experimentally observed resonances. Next we
include the possibility for a QGP formation based on the MIT bag model. The
results obtained compare very well with Lattice QCD calculations. In particular
the cross over to the QGP at about 175 MeV temperature is nicely reproduced.


title: Strangeness s = -3 dibaryons in a chiral quark model

abstract:
  The structures of $N\Omega_{(2,1/2)}$ and $\Delta\Omega_{(3,3/2)}$ with
strangeness $s=-3$ are dynamically studied in both the chiral SU(3) quark model
and the extended chiral SU(3) quark model by solving a resonating group method
(RGM) equation. The first model parameters are taken from our previous work,
which gave a satisfactory description of the energies of the baryon ground
states, the binding energy of the deuteron, the nucleon-nucleon(NN) scattering
phase shifts, and the hyperon-nucleon (YN) cross sections. The effect from the
vector meson fields is very similar to that from the one-gluon exchange
interaction, both in the chiral SU(3) quark model and the extended chiral SU(3)
quark model, the $N\Omega_{(2,1/2)}$ and $\Delta\Omega_{(3,3/2)}$ systems are
wealy bound states. The second model parameters are also taken from our
previous work by fitting the KN scattering process. when the mixing of scalar
mesons are considered, the $N\Omega_{(2,1/2)}$ and $\Delta\Omega_{(3,3/2)}$
systems change into unbound state.


title: Interplay between QCD and nuclear responses

abstract:
  We establish the interrelation between the QCD scalar response of the nuclear
medium and its response to a scalar probe coupled to nucleons, such as the
scalar meson responsible for the nuclear binding. The relation that we derive
applies at the nucleonic as well as at the nuclear levels. Non trivial
consequences follow. One concerns the scalar QCD susceptibility of the nucleon.
The other opens the possibility of relating medium effects in the scalar meson
exchange of nuclear physics to QCD lattice studies of the nucleon mass.


title: Neutral current neutrino-nucleus interactions at intermediate energies

abstract:
  We have extended our model for charged current neutrino-nucleus interactions
to neutral current reactions. For the elementary neutrino-nucleon interaction,
we take into account quasielastic scattering, Delta excitation and the
excitation of the resonances in the second resonance region. Our model for the
neutrino-nucleus collisions includes in-medium effects such as Fermi motion,
Pauli blocking, nuclear binding, and final-state interactions. They are
implemented by means of the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU)
coupled-channel transport model. This allows us to study exclusive channels,
namely pion production and nucleon knockout. We find that final-state
interactions modify considerably the distributions through rescattering,
charge-exchange and absorption. Side-feeding induced by charge-exchange
scattering is important in both cases. In the case of pions, there is a strong
absorption associated with the in-medium pionless decay modes of the Delta,
while nucleon knockout exhibits a considerable enhancement of low energy
nucleons due to rescattering. At neutrino energies above 1 GeV, we also obtain
that the contribution to nucleon knockout from Delta excitation is comparable
to that from quasielastic scattering.


title: Collective modes in relativistic npe matter at finite temperature

abstract:
  Isospin and density waves in neutral neutron-proton-electron (npe) matter are
studied within a relativistic mean-field hadron model at finite temperature
with the inclusion of the electromagnetic field. The dispersion relation is
calculated and the collective modes are obtained. The unstable modes are
discussed and the spinodals, which separate the stable from the unstable
regions, are shown for different values of the momentum transfer at various
temperatures. The critical temperatures are compared with the ones obtained in
a system without electrons. The largest critical temperature, 12.39 MeV, occurs
for a proton fraction y_p=0.47. For y_p=0.3 we get $T_{cr}$ =5 MeV and for
y_p>0.495 $T_cr\lesssim 8$ MeV.
  It is shown that at finite temperature the distillation effect in asymmetric
matter is not so efficient and that electron effects are particularly important
for small momentum transfers.


title: Modification of surface energy in nuclear multifragmentation

abstract:
  Within the statistical multifragmentation model we study modifications of the
surface and symmetry energy of primary fragments in the freeze-out volume. The
ALADIN experimental data on multifragmentation obtained in reactions induced by
high-energy projectiles with different neutron richness are analyzed. We have
extracted the isospin dependence of the surface energy coefficient at different
degrees of fragmentation. We conclude that the surface energy of hot fragments
produced in multifragmentation reactions differs from the values extracted for
isolated nuclei at low excitation. At high fragment multiplicity, it becomes
nearly independent of the neutron content of the fragments.


title:
Measuring Shear Viscosity Using Transverse Momentum Correlations in
  Relativistic Nuclear Collisions

abstract:
  Elliptic flow measurements at RHIC suggest that quark gluon plasma flows with
very little viscosity compared to weak coupling expectations, challenging
theorists to explain why this fluid is so nearly ``perfect''. It is therefore
vital to find quantitative experimental information on the viscosity of the
plasma. We propose that measurements of transverse momentum fluctuations can be
used to determine the shear viscosity. We use current data to estimate the
viscosity-to-entropy ratio in the range from 0.08 to 0.3, and discuss how
future measurements can reduce this uncertainty.


title:
The Narrowing of Charge Balance Function and Hadronization Time in
  Relativistic Heavy Ion Collisions

abstract:
  The widths of charge balance function in high energy hadron-hadron and
relativistic heavy ion collisions are studied using the Monte Carlo generators
PYTHIA and AMPT, respectively. The narrowing of balance function as the
increase of multiplicity is found in both cases. The mean parton-freeze-out
time of a heavy-ion-collision event is used as the characteristic hadronization
time of the event. It turns out that for a fixed multiplicity interval the
width of balance function is consistent with being independent of hadronization
time.


title: Nuclear symmetry potential in the relativistic impulse approximation

abstract:
  Using the relativistic impulse approximation with the Love-Franey \textsl{NN}
scattering amplitude developed by Murdock and Horowitz, we investigate the
low-energy (100 MeV$\leq E_{\mathrm{kin}}\leq 400$ MeV) behavior of the nucleon
Dirac optical potential, the Schr\"{o}dinger-equivalent potential, and the
nuclear symmetry potential in isospin asymmetric nuclear matter. We find that
the nuclear symmetry potential at fixed baryon density decreases with
increasing nucleon energy. In particular, the nuclear symmetry potential at
saturation density changes from positive to negative values at nucleon kinetic
energy of about 200 MeV. Furthermore,the obtained energy and density dependence
of the nuclear symmetry potential is consistent with those of the isospin- and
momentum-dependent MDI interaction with $x=0$, which has been found to describe
reasonably both the isospin diffusion data from heavy-ion collisions and the
empirical neutron-skin thickness of $^{208} $Pb.


title:
Isoscalar short-range current in the deuteron induced by an intermediate
  dibaryon

abstract:
  A new model for short-range isoscalar currents in the deuteron and in the NN
system is developed; it is based on the generation of an intermediate dibaryon
which is the basic ingredient for the medium- and short-range NN interaction
which was proposed recently by the present authors.This new current model can
very well describe the experimental data for the three basic deuteron
observables of isoscalar magnetic type, viz. the magnetic moment, the circular
polarization of the photon in the $np\to d\gamma$ process at thermal neutron
energies and the structure function B up to Q$^2$=60 fm$^{-2}$.


title: The Skyrme Interaction in finite nuclei and nuclear matter

abstract:
  Self-consistent mean-field models are a powerful tool in the investigation of
nuclear structure and low-energy dynamics. They are based on effective
energy-density functionals, often formulated in terms of effective
density-dependent nucleon-nucleon interactions. The free parameters of the
functional are adjusted to empirical data. A proper choice of these parameters
requires a comprehensive set of constraints covering experimental data on
finite nuclei, concerning static as well as dynamical properties, empirical
characteristics of nuclear matter, and observational information on
nucleosynthesis, neutron stars and supernovae. This work aims at a
comprehensive survey of the performance of one of the most successful
non-relativistic self-consistent method, the Skyrme-Hartree-Fock model (SHF),
with respect to these constraints. A full description of the Skyrme functional
is given and its relation to other effective interactions is discussed. The
validity of the application of SHF far from stability and in dense environments
beyond the nuclear saturation density is critically assessed. The use of SHF in
models extended beyond the mean field approximation by including some
correlations is discussed. Finally, future prospects for further development of
SHF towards a more consistent application of the existing and promisingly newly
developing constraints are outlined.


title:
Final State Interaction Effects in the $e^+e^-\to N\bar{N}$ Process near
  Threshold

abstract:
  We use the Paris nucleon-antinucleon optical potential for explanation of
experimental data in the process $e^+e^- \to p\bar p$ near threshold. It is
shown that the cross section and the electromagnetic form factors are very
sensitive to the parameters of the potential. It turns out that final-state
interaction due to slightly modified absorptive part of the potential allows us
to reproduce available experimental data. We also demonstrated that the cross
section in $n\bar{n}$ channel is larger than that in $p\bar{p}$ one, and their
ratio is almost energy independent up to 2.2 GeV.


title:
Configuration mixing calculation for complete low-lying spectra with the
  mean-field Hamiltonian

abstract:
  We propose a new theoretical approach to ground and low-energy excited states
of nuclei extending the nuclear mean-field theory. It consists of three steps:
stochastic preparation of many Slater determinants, the parity and angular
momentum projection, and diagonalization of the generalized eigenvalue
problems. The Slater determinants are constructed in the three-dimensional
Cartesian coordinate representation capable of describing arbitrary shape of
nuclei. We examine feasibility and usefulness of the method by applying the
method with the BKN interaction to light 4N-nuclei, 12C, 16O, and 20Ne. We
discuss difficulties of keeping linear independence for basis states projected
on good parity and angular momentum and present a possible prescription.


title:
Isospin effects on sub-threshold kaon production at intermediate
  energies

abstract:
  We show that in collisions with neutron rich heavy ions at energies around
the production threshold K^0 and K^+ yields might probe the isospin dependent
part of the nuclearEquation of State (EoS) at high baryon densities. In
particular we suggest the K^0/K^+ ratio as a promising observable. Results
obtained in a fully covariant relativistic transport approach are presented for
central Au+Au collisions in the beam energy range 0.8-1.8~AGeV. The focus is
put on the EoS influence which goes beyond the "collision-cascade" picture. The
isovector part of the in-medium interaction affects the kaon multiplicities via
two mechanisms: i) a "symmetry potential" effect, i.e. a larger neutron
repulsion in n-rich systems (isospin fractionation); ii) a "threshold" effect,
due to the change in the self-energies of the particles involved in inelastic
processes. Genuine relativistic contributions are revealed, that could allow to
directly ``measure'' the Lorentz structure of the effective isovector
interaction.


title: Detecting Strangeness -4 Dibaryon States

abstract:
  Recent experiments at Jefferson Laboratory and potential new facilities at
the Japan Proton Accelerator Research Complex (J-PARC) make it evident that the
discovery of a spin-singlet S-wave di-cascade bound state of two cascade (Xi)
particles is feasible. We state the simple arguments, based on SU(3) flavor
symmetry, for the existence of this bound state, review the previous
predictions and comment on the experimental conditions necessary for detection.


title:
Extension of the LAQGSM03.01 Code to Describe Photo-Nuclear Reactions up
  to Tens of GeV

abstract:
  The Los Alamos version of the Quark-Gluon String Model implemented in the
code LAQGSM03 was extended to describe photonuclear reactions at energies up to
tens of GeV. We have incorporated 56 channels to consider gamma+p elementary
interactions during the cascade stage of reactions and 56 channels for gamma+n
interactions, in addition to absorption of photons on two-nucleon pairs, into
LAQGSM03 and have tested the extended code referred to as LAQGSM03.01 on a
number of measured high-energy photonuclear reactions. Here, we present the
photonuclear reaction model of LAQGSM03.01 and show examples of its results
compared with available experimental data.

categories: nucl-th astro-ph hep-ph nucl-ex physics.data-an


title: Equation of state extracted from the root-mean-square-radius-isospin

abstract:
  Experimental correlation between the rms nucleus charge radius and the
neutron-proton asymmetry is discussed. Simple attempt of explanation of this
correlation using a semi-empirical liquid drop model which takes into account
nuclear compressibility, nuclear deformation and neutron skin effects is
presented. It seems that such procedure could be used as a tool for
determination of the nuclear equation of state.


title: Eccentricity fluctuations and elliptic flow at RHIC

abstract:
  Fluctuations in nucleon positions can affect the spatial eccentricity of the
overlap zone in nucleus-nucleus collisions. We show that elliptic flow should
be scaled by different eccentricities depending on which method is used for the
flow analysis. These eccentricities are estimated semi-analytically. When $v_2$
is analyzed from 4-particle cumulants, or using the event plane from directed
flow in a zero-degree calorimeter, the result is shown to be insensitive to
eccentricity fluctuations.


title: Scattering as a tool to study nuclear structure toward the drip lines

abstract:
  Results are presented for the elastic scattering of electrons and protons
from the exotic He and Li isotopes. Comparison with scattering results from the
stable He and Li nuclei allows for an investigation into the effects that the
extensive neutron distributions have on the charge density. For comparison we
also consider the proton halo nucleus 8B. The consequences and possible
suggestions for proposed electron scattering facilities for exotic nuclei are
discussed.


title:
Test of J-matrix inverse scattering potentials on electromagnetic
  reactions of few-nucleon systems

abstract:
  The J-matrix inverse scattering nucleon-nucleon potentials (JISP), describing
both two-nucleon data and bound and resonant states of light nuclei to high
accuracy, are tested on the total photoabsorption cross sections of Deuteron,
Triton, 3He and 4He. The calculations in the three- and four-body systems are
carried out via the Lorentz integral transform method and the hyperspherical
harmonics (HH) technique. To this end the HH formalism has been adapted to
accommodate non-local potentials. The cross sections calculated with the JISP
are compared to those obtained with more traditional realistic interactions,
which include two- and three-nucleon forces. While the results of the two kinds
of potential models do not differ significantly at lower energies, beyond the
resonance peak they show fairly large discrepancies, which increase with the
nuclear mass. We argue that these discrepancies may be due to a probably
incorrect long range behavior of the JISP, since the one pion exchange is not
manifestly implemented there.


title:
Transition from participant to spectator fragmentation in Au+Au reaction
  between 60 AMeV and 150 AMeV

abstract:
  Using the quantum molecular dynamics approach, we analyze the results of the
recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and
150 AMeV. It turns out that in this energy region the transition toward a
participant-spectator scenario takes place. The large Au+Au system displays in
the simulations as in the experiment simultaneously dynamical and statistical
behavior which we analyze in detail: The composition of fragments close to
midrapidity follows statistical laws and the system shows bi-modality, i.e. a
sudden transition between different fragmentation pattern as a function of the
centrality as expected for a phase transition. The fragment spectra at small
and large rapidities, on the other hand, are determined by dynamics and the
system as a whole does not come to equilibrium, an observation which is
confirmed by FOPI experiments for the same system.


title:
Baryon-baryon interactions in the SU6 quark model and their applications
  to light nuclear systems

abstract:
  Interactions between the octet-baryons (B8) in the spin-flavor SU6 quark
model are investigated in a unified coupled-channels framework of the
resonating-group method (RGM). The interaction Hamiltonian for quarks consists
of the phenomenological confinement potential, the color Fermi-Breit
interaction with explicit flavor-symmetry breaking (FSB), and effective-meson
exchange potentials of scalar-, pseudoscalar- and vector-meson types. The model
parameters are determined to reproduce the properties of the nucleon-nucleon
(NN) system and the low-energy cross section data for the hyperon-nucleon (YN)
interactions. The NN phase shifts and many observables for the NN and YN
interactions are nicely reproduced. Properties of these B8 B8 interactions are
analyzed through the G-matrix calculations. The B8 B8 interactions are then
applied to some of few-baryon systems and light Lambda-hypernuclei in a
three-cluster Faddeev formalism using two-cluster RGM kernels. An application
to the three-nucleon system shows that the quark-model NN interaction can give
a sufficient triton binding energy with little room for the three-nucleon
force. The hypertriton Faddeev calculation indicates that the attraction of the
Lambda N interaction in the 1S0 state is only slightly more attractive than
that in the 3S1 state. In the application to the alpha alpha Lambda system, the
energy spectrum of 9 Lambda Be is well reproduced using the alpha alpha RGM
kernel. The very small spin-orbit splitting of the 9 Lambda Be excited states
is also discussed. In the Lambda Lambda alpha Faddeev calculation, the NAGARA
event for 6 Lambda Lambda He is found to be consistent with the quark-model
Lambda Lambda interaction.


title: Flow Coefficients and Jet Characteristics in Heavy Ion Collisions

abstract:
  Identifying jets in heavy ion collisions is of significant interest since the
properties of jets are expected to get modified because of the formation of
quark gluon plasma. The detection of jets is, however, difficult because of
large number of non-jet hadrons produced in the collision process. In this work
we propose a method of identifying a jet and determining its transverse
momentum by means of flow analysis. This has been done an event-by-event basis.


title: Direct reactions in/for astrophysics

abstract:
  Precise nuclear reaction rates are needed for a detailed description of the
production of elements in primordial nucleosynthesis and during the hydrostatic
burning of stars to constrain the astrophysical models. The relevant reactions
are extremely difficult to measure directly in the laboratory at the small
astrophysical energies. In recent years direct reactions methods have been
developed and applied to extract low-energy astrophysical S factors. The
application of these methods requires a combination of experimental and
theoretical efforts. This contribution focuses on the underlying reaction
theories that have to be well understood in order to assess the precision and
limitations of the various approaches.


title:
Pion induced double charge exchange reactions in the Delta resonance
  region

abstract:
  We have applied the Giessen BUU (GiBUU) transport model to the description of
the double charge exchange (DCX) reaction of pions with different nuclear
targets at incident kinetic energies of 120-180 MeV . The DCX process is highly
sensitive to details of the interactions of pions with the nuclear medium and,
therefore, represents a major benchmark for any model of pion scattering off
nuclei at low and intermediate energies. The impact of surface effects, such as
the neutron skins of heavy nuclei, is investigated. The dependence of the total
cross section on the nuclear mass number is also discussed. We achieve a good
quantitative agreement with the extensive data set obtained at LAMPF.
Furthermore, we compare the solutions of the transport equations obtained in
the test-particle ansatz using two different schemes - the full and the
parallel ensemble method.


title: Partial-Wave Analysis of Single-Pion Production Reactions

abstract:
  We present an overview of our efforts to analyze pion-nucleon elastic
scattering data, along with data from related photo- and electroproduction
reactions, in order to study the baryon spectrum. We then focus on the
Delta(1232) resonance. Fits to pion photo- and electroproduction data have been
used to extract values for the R_EM = E2/M1 and R_SM = S2/M1 ratios as
functions of Q^2. These results are compared to other recent determinations.


title: Space-time evolution of bulk QCD matter

abstract:
  We introduce a combined fully three-dimensional macroscopic/microscopic
transport approach employing relativistic 3D-hydrodynamics for the early,
dense, deconfined stage of the reaction and a microscopic non-equilibrium model
for the later hadronic stage where the equilibrium assumptions are not valid
anymore. Within this approach we study the dynamics of hot, bulk QCD matter,
which is being created in ultra-relativistic heavy ion collisions at RHIC. Our
approach is capable of self-consistently calculating the freezeout of the
hadronic system, while accounting for the collective flow on the hadronization
hypersurface generated by the QGP expansion. In particular, we perform a
detailed analysis of the reaction dynamics, hadronic freezeout, and transverse
flow.


title:
Study of the threshold behavior of the $\eta$N scattering amplitude
  through the associated photoproduction of $\phi$- and $\eta$-mesons

abstract:
  We suggest that the $\gamma p \to \phi \eta p$ reaction cross section, in the
kinematics where the $\eta p$ invariant mass in the final state lies between
the threshold value (m$_p$+m$_\eta$) and the N*(1535) resonance mass, is
largely determined by the $\eta N$ scattering amplitude close to threshold. The
initial photon energy is chosen in the range $4 < E_\gamma^{Lab} < 5$ GeV, in
order to reach low (absolute) values of the squared 4-momentum transfer from
the initial photon to the final $\phi$-meson. In these conditions, we expect
the t-channel $\pi^0$- and $\eta$-meson exchanges to drive the dynamics
underlying the $\gamma p \to \phi \eta p$ process. We show that the
$\eta$-exchange is the dominating contribution to the cross section while the
$\pi^0$-exchange is negligible. The $\eta$-$\pi^0$ interference is of the order
of $20 - 30 %$. The sign of this term is not known and alters significantly our
results. Data on the $\gamma p \to \phi \eta p$ process would be therefore very
useful to help unravelling the behavior of the $\eta p$ scattering amplitude
close to threshold and assessing the possibility of producing $\eta$-nucleus
bound states.


title:
Incoherent pion photoproduction on the deuteron in the first resonance
  region

abstract:
  Incoherent pion photoproduction on the deuteron is studied in the first
resonance region. The unpolarized cross section, the beam asymmetry, and the
vector and tensor target asymmetries are calculated in the framework of a
diagrammatic approach. Pole diagrams and one-loop diagrams with $NN$ scattering
in the final state are taken into account. An elementary operator for pion
photoproduction on the nucleon is taken in various on-shell forms and
calculated using the SAID and MAID multipole analyses. Model dependence of the
obtained results is discussed in some detail. A comparison with predictions of
other works is given. Although a reasonable description of many available
experimental data on the unpolarized total and differential cross sections and
photon asymmetry has been achieved, in some cases a significant disagreement
between the theory and experiment has been found. Invoking known information on
the reactions $\gamma d\to\pi^0 d$ and $\gamma d\to np$ we predict the total
photoabsorption cross section for deuterium. We find that our values strongly
overestimate experimental data in the vicinity of the $\Delta$ peak.


title: All orders breakup of heavy exotic nuclei in a semiclassical model

abstract:
  We present a semiclassical and mostly analytical model of elastic neutron
breakup reactions for exotic projectiles. Both nuclear and Coulomb induced
reactions are considered and the potentials are treated to all orders in the
interactions. Furthermore we introduce a technique which allows the use of the
full Coulomb potential, thus including all multipoles besides the dipole.
Results for deeply bound states as well as for halo initial states are
presented and it is shown that experiments on heavy targets would be well
suited to study exotic nuclei with tightly bound valence nucleons.


title: Quantum Monte Carlo calculations of symmetric nuclear matter

abstract:
  We present an accurate numerical study of the equation of state of nuclear
matter based on realistic nucleon--nucleon interactions by means of Auxiliary
Field Diffusion Monte Carlo (AFDMC) calculations. The AFDMC method samples the
spin and isospin degrees of freedom allowing for quantum simulations of large
nucleonic systems and can provide quantitative understanding of problems in
nuclear structure and astrophysics.


title:
Comment on: Non-perturbative finite T broadening of the rho meson and
  dilepton emission in heavy ion-collisions (by J. Ruppert and T. Renk Phys.
  Rev. C71 (2005) 064903; nucl-th/0412047

abstract:
  In this comment we point out several problems concerning kinematical
singularities which are encountered in the calculation of the dilepton rates in
{Ruppert:2004yg}. We also comment on the method introduced in {vanHees:2000bp}
and further used in refs. {Riek:2004kx,Renk:2006dt,Renk:2006ax,Ruppert:2004yg}


title: Elastic Electron Scattering off Exotic Nuclei

abstract:
  Electron scattering will provide the most direct information about charge
distribution in exotic nuclei. A technical proposal for an electron-heavy-ion
collider has been incorporated in the GSI/Germany physics program
(spokesperson: Haik Simon - GSI). The main purpose is to study the structure of
nuclei far from the stability line. In this work I explore the possibilities to
study charge distributions of nuclei far form the stability line with the
proposed facility.


title: Solving the Nose-Hoover thermostat for Nuclear Pasta

abstract:
  In this work we present a calculation of the hamiltonian variables solving
the molecular dynamics equations of motion for a system of nuclear matter
relevant to the description of nuclear pasta. The temperature is kept fixed by
using the Nos\'{e}-Hoover Thermostat and the interaction is modelled via a
semiclassical potential depending on both positions and momenta.


title:
Deuteron tensor polarization component T_20(Q^2) as a crucial test for
  deuteron wave functions

abstract:
  The deuteron tensor polarization component T_20(Q^2) is calculated by
relativistic Hamiltonian dynamics approach. It is shown that in the range of
momentum transfers available in to-day experiments, relativistic effects, meson
exchange currents and the choice of nucleon electromagnetic form factors almost
do not influence the value of T_20(Q^2). At the same time, this value depends
strongly on the actual form of the deuteron wave function, that is on the model
of NN-interaction in deuteron. So the existing data for T_20(Q^2) provide a
crucial test for deuteron wave functions.


title: Parameterization of the phase shift D33 for Pion-Nucleon Scattering

abstract: This paper is withdrawn.


title: Nuclear Superconductivity in Compact Stars: BCS Theory and Beyond

abstract:
  This chapter provides a review of microscopic theories of pairing in nuclear
systems and neutron stars. Special attention is given to the mean-field BCS
theory and its extensions to include effects of polarization of the medium and
retardation of the interactions. Superfluidity in nuclear systems that exhibit
isospin asymmetry is studied. We further address the crossover from the
weak-coupling BCS description to the strong-coupling BEC limit in dilute
nuclear systems. Finally, within the observational context of rotational
anomalies of pulsars, we discuss models of the vortex state in superfluid
neutron stars and of the mutual friction between superfluid and normal
components, along with the possibility of type-I superconductivity of the
proton subsystem.


title:
Spin polarized neutron matter within the Dirac-Brueckner-Hartree-Fock
  approach

abstract:
  The relation between energy and density (known as the nuclear equation of
state) plays a major role in a variety of nuclear and astrophysical systems.
Spin and isospin asymmetries can have a dramatic impact on the equation of
state and possibly alter its stability conditions. An example is the possible
manifestation of ferromagnetic instabilities, which would indicate the
existence, at a certain density, of a spin-polarized state with lower energy
than the unpolarized one. This issue is being discussed extensively in the
literature and the conclusions are presently very model dependent. We will
report and discuss our recent progress in the study of spin-polarized neutron
matter. The approach we take is microscopic and relativistic. The calculated
neutron matter properties are derived from realistic nucleon-nucleon
interactions. This makes it possible to understand the nature of the EOS
properties in terms of specific features of the nuclear force model.


title: Symmetry Energy

abstract:
  Examination of symmetry energy is carried out on the basis of an elementary
binding-energy formula. Constraints are obtained on the energy value at the
normal nuclear density and on the density dependence of the energy at subnormal
densities.


title:
Heavy Ion Collisions at Relativistic Energies: Testing a Nuclear Matter
  at High Baryon and Isospin Density

abstract:
  We show that the phenomenology of isospin effects on heavy ion reactions at
intermediate energies (few AGeV range) is extremely rich and can allow a
``direct'' study of the covariant structure of the isovector interaction in the
hadron medium. We work within a relativistic transport frame, beyond a cascade
picture, consistently derived from effective Lagrangians, where isospin effects
are accounted for in the mean field and collision terms. Rather sensitive
observables are proposed from collective flows (``differential'' flows) and
from pion/kaon production ($\pi^-/\pi^+$, $K^0/K^+$ yields). For the latter
point relevant non-equilibrium effects are stressed. The possibility of the
transition to a mixed hadron-quark phase, at high baryon and isospin density,
is finally suggested. Some signatures could come from an expected ``neutron
trapping'' effect.


title:
Production of cold fragments in nucleus-nucleus collisions in the
  Fermi-energy domain

abstract:
  The reaction mechanism of nucleus-nucleus collisions at projectile energies
around the Fermi energy is investigated with emphasis on the production of
fragmentation-like residues. The results of simulations are compared to
experimental mass distributions of elements with Z = 21 - 29 observed in the
reactions 86Kr+124,112Sn at 25 AMeV. The model of incomplete fusion is modified
and a component of excitation energy of the cold fragment dependent on isospin
asymmetry is introduced. The modifications in the model of incomplete fusion
appear consistent with both overall model framework and available experimental
data. A prediction is provided for the production of very neutron-rich nuclei
using a secondary beam of 132Sn where e.g. the reaction 132Sn+238U at 28 AMeV
appears as a possible alternative to the use of fragmentation reactions at
higher energies.


title: Dynamical aspects of isotopic scaling

abstract:
  Investigation of the effect of the dynamical stage of heavy-ion collisions
indicates that the increasing width of the initial isospin distributions is
reflected by a significant modification of the isoscaling slope for the final
isotopic distributions after de-excitation. For narrow initial distributions,
the isoscaling slope assumes the limiting value of the two individual initial
nuclei while for wide initial isotopic distributions the slope for hot
fragments approaches the initial value. The isoscaling slopes for final cold
fragments increase due to secondary emissions. The experimentally observed
evolution of the isoscaling parameter in multifragmentation of hot
quasiprojectiles at E$_{inc}$=50 AMeV, fragmentation of $^{86}$Kr projectiles
at E$_{inc}$=25 AMeV and multifragmentation of target spectators at
relativistic energies was reproduced by a simulation with the dynamical stage
described using the appropriate model (deep inelastic transfer and incomplete
fusion at the Fermi energy domain and spectator-participant model at
relativistic energies) and the de-excitation stage described with the
statistical multifragmentation model. In all cases the isoscaling behavior was
reproduced by a proper description of the dynamical stage and no unambiguous
signals of the decrease of the symmetry energy coefficient were observed.


title:
$^1S_0$ superfluid phase--transition in neutron matter with realistic
  nuclear potentials and modern many--body theories

abstract:
  The $^1S_0$ pairing in neutron matter has been investigated in presence of
realistic two-- and three--nucleon interactions. We have adopted the Argonne
$v_{8^\prime}$ NN and the Urbana IX 3N potentials. Quantum Monte Carlo theory,
specifically the Auxiliary Field Diffusion Monte Carlo method, and Correlated
Basis Function theory are employed in order to get quantitative and reliable
estimates of the gap. They both fully take into account the medium
modifications due to the interaction induced correlations. The two methods are
in good agreement up to the maximum gap density and both point to a slight
reduction with respect to the standard BCS value. In fact, the maximum gap is
about $2.5 \text{MeV}$ at $k_F \sim 0.8 \text{fm}^{-1}$ in BCS and 2.3--$2.4
\text{MeV}$ at $k_F \sim 0.6 \text{fm}^{-1}$ in correlated matter. At higher
densities the Quantum Monte Carlo gap becomes close to BCS. In general, the
computed medium polarization effects are much smaller than those previously
estimated within \emph{all theories}. Truncations of Argonne $v_{8^\prime}$ to
simpler forms give the same gaps in BCS, provided the truncated potentials have
been refitted to the same NN data set. Differences among the models appear in
the correlated theories, most of the reduction being attributable to the tensor
force. The three--nucleon interaction provides an additional increase of the
gap of about 0.35 MeV.


title: Isospin Dynamics in Heavy Ion Collisions

abstract:
  Some isospin dynamics results in heavy ion collisions from low to
relativistic energies obtained through transport approaches, largely inspired
by David M.Brink, are reviewed. At very low energies, just above the Coulomb
barrier, the stimulating implications of the prompt dipole radiation in
dissipative collisions of ions with large isospin asymmetries are discussed. We
pass then to the very rich phenomenology of isospin effects on heavy ion
reactions at intermediate energies (few AGeV range). We show that it can allow
a ``direct'' study of the covariant structure of the isovector interaction in
the hadron medium. We work within a relativistic transport frame, beyond a
cascade picture, consistently derived from effective Lagrangians, where isospin
effects are accounted for in the mean field and collision terms. Rather
sensitive observables are proposed from collective flows (``differential''
flows) and from pion/kaon production ($\pi^-/\pi^+$, $K^0/K^+$ yields). For the
latter point relevant non-equilibrium effects are stressed. The possibility of
the transition to a mixed hadron-quark phase, at high baryon and isospin
density, is finally suggested. Some signatures could come from an expected
``neutron trapping'' effect. The importance of {\it violent} collision
experiments with radioactive beams, from few AMeV to few AGeV, is stressed.


title: Pygmy resonances probed with electron scattering

abstract:
  Pygmy resonances in light nuclei excited in electron scattering are
discussed. These collective modes will be explored in future electron-ion
colliders such as ELISe/FAIR (spokesperson: Haik Simon - GSI). Response
functions for direct breakup are explored with few-body and hydrodynamical
models, including the dependence upon final state interactions.


title: Neutrino-Nucleus Quasi-Elastic Scattering in a Relativistic Model

abstract:
  A relativistic distorted-wave impulse-approximation model is applied to
neutral-current and charged-current quasi-elastic neutrino-nucleus scattering.
The effects of final state interactions are investigated and the sensitivity of
the results to the strange nucleon form factors is discussed in view of their
possible experimental determination


title: Hadronic Parity Violation: an Analytic Approach

abstract:
  Using a recent reformulation of the analysis of nuclear parity-violation (PV)
within the framework of effective field theory (EFT), we show how predictions
for parity-violating observables in low-energy light hadronic systems can be
understood in an analytic fashion. It is hoped that such an analytic approach
may encourage additional experimental work as well as add to the understanding
of such parity-violation phenomena, which is all too often obscured by its
description in terms of numerical results obtained from complex two-body
potential codes.


title:
Neutron Rich Nuclei in Heaven and Earth: Proceedings of the
  International Conference on Current Problems in Nuclear Physics and Atomic
  Energy

abstract:
  The nucleus of 208Pb -- a system that is 18 order of magnitudes smaller and
55 orders of magnitude lighter than a neutron star -- may be used as a
miniature surrogate to establish important correlations between its neutron
skin and several neutron-star properties. Indeed, a nearly model-independent
correlation develops between the neutron skin of 208Pb and the liquid-to-solid
transition density in a neutron star. Further, we illustrate how a measurement
of the neutron skin in 208Pb may be used to place important constraints on the
cooling mechanism operating in neutron stars and may help elucidate the
existence of quarks stars.