title: An overview of heavy quark energy loss puzzle at RHIC

abstract:
  We give a theoretical overview of the heavy quark tomography puzzle posed by
recent non-photonic single electron data from central Au+Au collisions at
$\sqrt{s} = 200$ AGeV. We show that radiative energy loss mechanisms alone are
not able to explain large single electron suppression data, as long as
realistic parameter values are assumed. We argue that combined collisional and
radiative pQCD approach can solve a substantial part of the non-photonic single
electron puzzle.


title:
Flavor content of nucleon form factors in the space- and time-like
  region

abstract:
  I discuss a two-component model of nucleon form factors in which the external
photon couples both to an intrinsic three-quark structure and to a meson cloud
via vector-meson dominance, and present a simultaneous analysis of the
electromagnetic form factors of the nucleon in the space- and time-like regions
as well as their strangeness content.


title: Effective Field Theory and the Nuclear Many Body Problem

abstract:
  We review many body calculations of the equation of state of dilute neutron
matter in the context of effective field theories of the nucleon-nucleon
interaction.


title:
Constraining the Skyrme effective interactions and the neutron skin
  thickness of nuclei using isospin diffusion data from heavy ion collisions

abstract:
  Recent analysis of the isospin diffusion data from heavy-ion collisions based
on an isospin- and momentum-dependent transport model with in-medium
nucleon-nucleon cross sections has led to the extraction of a value of $L=88\pm
25$ MeV for the slope of the nuclear symmetry energy at saturation density.
This imposes stringent constraints on both the parameters in the Skyrme
effective interactions and the neutron skin thickness of heavy nuclei. Among
the 21 sets of Skyrme interactions commonly used in nuclear structure studies,
the 4 sets SIV, SV, G$_\sigma$, and R$_\sigma$ are found to give $L$ values
that are consistent with the extracted one. Further study on the correlations
between the thickness of the neutron skin in finite nuclei and the nuclear
matter symmetry energy in the Skyrme Hartree-Fock approach leads to predicted
thickness of the neutron skin of $0.22\pm 0.04$ fm for $^{208}$Pb, $0.29\pm
0.04$ fm for $^{132}$Sn, and $0.22\pm 0.04$ fm for $^{124}$Sn.


title: Isospin mode splitting and mixing in asymmetric nuclear matter

abstract:
  We estimate exclusive density and asymmetry parameter dependent dispersion
relations of various charged states of pions in asymmetric nuclear matter. The
possibility of matter induced mixing of $\pi^0$ with $\eta$ is clearly exposed
with the further mass modification of $\pi^0$ meson due to mixing. Asymmetry
driven mass splitting and mixing amplitude are of the same order as the
corresponding values in vacuum. Closed form analytic results for the mass
shifts and dispersion relations with and without mixing are presented.
Furthermore, we discuss the sensitivity of our results on the scalar mean field
within the framework of Quantum Hadrodynamics.


title: The continuum description with pseudo-state wave functions

abstract:
  Benchmark calculations are performed aiming to test the use of two different
pseudo-state bases on the the Multiple Scattering expansion of the total
Transition amplitude (MST) scattering framework. Calculated differential cross
sections for p-6He inelastic scattering at 717 MeV/u show a good agreement
between the observables calculated in the two bases. This result gives extra
confidence on the pseudo-state representation of continuum states to describe
inelastic/breakup scattering.


title: Scales in nuclear matter: Chiral dynamics with pion nucleon form factors

abstract:
  A systematic calculation of nuclear matter is performed which includes the
long-range correlations between nucleons arising from one- and two-pion
exchange. Three-body effects from $2\pi$-exchange with excitations of virtual
$\Delta(1232)$-isobars are also taken into account in our diagrammatic
calculation of the energy per particle $\bar E(k_f)$. In order to eliminate
possible high-momentum components from the interactions we introduce at each
pion-baryon vertex a form factor of monopole type. The empirical nuclear matter
saturation point, $\rho_0 \simeq 0.16 $fm$^{-3}$, $\bar E_0\simeq -16 $MeV, is
well reproduced with a monopole mass of $\Lambda \simeq 4\pi f_\pi \simeq 1.16
$GeV. As in the recent approach based on the universal low-momentum
$NN$-potential $V_{\rm low-k}$, the inclusion of three-body effects is crucial
in order to achieve saturation of nuclear matter. We demonstrate that the
dependence of the pion-exchange contributions to $\bar E(k_f)$ on the
''resolution'' scale $\Lambda$ can be compensated over a wide range of
$\Lambda$ by counterterms with two ''running'' contact-couplings. As a further
application we study the in-medium chiral condensate $<\bar q q >(\rho)$ beyond
the linear density approximation. For $\rho \leq 1.5 \rho_0$ we find small
corrections from the derivative $d \bar E(k_f)/d m_\pi$, which are stable
against variations of the monopole regulator mass $\Lambda$.


title:
Variation after Particle-Number Projection for the HFB Method with the
  Skyrme Energy Density Functional

abstract:
  Variation after particle-number restoration is incorporated for the first
time into the Hartree-Fock-Bogoliubov framework employing the Skyrme energy
density functional with zero-range pairing. The resulting projected HFB
equations can be expressed in terms of the local gauge-angle-dependent
densities. Results of projected calculations are compared with those obtained
within the Lipkin-Nogami method in the standard version and with the
Lipkin-Nogami method followed by exact particle-number projection.


title: Strangeness in the proton and N*(1535)

abstract:
  The newest progress on the study of the strangeness in the proton and in the
lowest negative parity nucleon excited state $N^*(1535)$ is reviewed.
Implications on the internal quark structure of the proton, $N^*(1535)$ and
other baryons are discussed. The diquark cluster picture for the 5-quark
components in baryons gives a natural explanation not only to the empirical
indications for a positive strangeness magnetic moment $\mu_s$ and positive
strangeness radius of the proton but also the longstanding mass-reverse problem
of $N^*(1535)$, $N^*(1440)$ and $\Lambda^*(1405)$ resonances as well as the
unusual decay pattern of the $N^*(1535)$ resonance. Evidence for possible
existence of $N^*(1535)$'s ${1/2}^-$ SU(3) nonet partners in this picture is
pointed out, and suggestion is made to search for these $1/2^-$ hyperon excited
states under the well known $\Sigma^*(1385)$, $\Lambda^*(1520)$ and
$\Xi^*(1530)$ peaks in various reactions.


title: Freeze Out Process with In-Medium Nucleon Mass

abstract:
  We investigate the kinetic freeze out scenario of a nucleon gas through a
finite layer. The in-medium mass modification of nucleons and it's impact on
the freeze out process is studied. A considerable modification of the
thermodynamical parameters temperature, flow-velocity, energy density and
particle density has been found in comparison with evaluations which use a
constant vacuum nucleon mass.


title: Gamow-Teller strength distributions in Xe isotopes

abstract:
  The energy distributions of the Gamow-Teller strength are studied for
even-even Xe isotopes with mass numbers from 124 to 142. A self-consistent
microscopic formalism is used to generate the single particle basis, using a
deformed Skyrme Hartree-Fock mean field with pairing correlations in BCS
approximation. The Gamow-Teller transitions are obtained within a quasiparticle
random phase approximation (QRPA) approach using a residual spin-isospin
interaction in the particle-hole and particle-particle channels. We then
discuss the pairing BCS treatment and the determination of the ph and pp
residual interaction coupling constants. We study the GT+ and GT- strength
distributions for the equilibrium nuclear shapes, which are an essential
information for studies of charge-exchange reactions and double-beta processes
involving these isotopes.


title: Roper + Pion decays as a test of the radial resonances wavefunction

abstract:
  We calculate the decays of baryon resonances to the pion + Roper resonance
channel in the frame of the flux-tube breaking model. The baryon and meson
wavefunctions we use are obtained from a linear confinement semi-relativistic
constituent quark model. The results, in good agreement with the existing data,
provide a spectrum independant test on the radial form of the main component of
the Roper resonance. They shed light on a likely orbital nature for the second
delta resonance.


title:
Isospin mixing, Fermi transitions and signatures of nuclear deformation
  within a mean field approach

abstract:
  Gamow-Teller and Fermi transitions are considered in a HF+BCS+pnQRPA
theoretical framework. We show here how Gamow-Teller strength distributions can
be used in a search for signatures of nuclear deformation in neutron deficient
Pb, Hg and Po isotopes, as well as how Fermi transitions allow us to quantify
isospin mixing in some even Kr isotopes around N=Z.


title:
Inclusive $\omega$ photoproduction from nuclei and $\omega$ in the
  nuclear medium

abstract:
  With the aim of extracting information on the shift of the $\omega$ mass in
the nuclear medium we analyze data obtained at ELSA from where claims for
evidence of a mass shift of the $\omega$ have been made. We develop a Monte
Carlo simulation code which takes into account the possible reactions in the
experimental set up of $(\gamma ~ A \to \pi^0 \gamma ~X)$ in the vicinity of
the $\omega$ production region with subsequent $\omega \to \pi^0 \gamma$ decay.
We compare our results with experiment for the distribution of $\pi^0 \gamma$
invariant masses and conclude that the distribution is compatible with an
enlarged $\omega$ width of about 90 MeV at nuclear matter density and no shift
in the mass. This change in the width would be compatible with the preliminary
results obtained from the transparency ratio in the A dependence of $\omega$
production. The discrepancy of the present conclusions with former claims of an
evidence for a shift of the $\omega$ mass stem from a different choice of
background which is discussed in the paper.


title:
$\omega - \pi\gamma^*$ transition form factor in proton-proton
  collisions

abstract:
  Dalitz decays of $\omega$ and $\rho$ mesons, $\omega\to \pi^0\gamma^*\to\pi^0
e^+e^-$ and $\rho^0\to \pi^0\gamma^*\to\pi^0 e^+e^-$, produced in $pp$
collisions are calculated within a covariant effective meson-nucleon theory. We
argue that the $\omega$ transition form factor $F_{\omega\to \pi^0\gamma^*}$ is
experimentally accessible in a fairly model independent way in the reaction $pp
\to pp \pi^0 e^+ e^-$ for invariant masses of the $\pi^0 e^+ e^-$ subsystem
near the $\omega$ pole. Numerical results are presented for the intermediate
energy kinematics of envisaged HADES experiments.


title: Nuclear matter with Brown-Rho-scaled Fermi liquid interactions

abstract:
  We present a description of symmetric nuclear matter within the framework of
Landau Fermi liquid theory. The low momentum nucleon-nucleon interaction
V(low-k) is used to calculate the effective interaction between quasiparticles
on the Fermi surface, from which we extract the quasiparticle effective mass,
the nuclear compression modulus, the symmetry energy, and the anomalous orbital
gyromagnetic ratio. The exchange of density, spin, and isospin collective
excitations is included through the Babu-Brown induced interaction, and it is
found that in the absence of three-body forces the self-consistent solution to
the Babu-Brown equations is in poor agreement with the empirical values for the
nuclear observables. This is improved by lowering the nucleon and meson masses
according to Brown-Rho scaling, essentially by including a scalar tadpole
contribution to the meson and nucleon masses, as well as by scaling g_A. We
suggest that modifying the masses of the exchanged mesons is equivalent to
introducing a short-range three-body force, and the net result is that the
Brown-Rho double decimation is accomplished all at once.


title:
Tensor polarization of $\omega$ produced at threshold in $p-p$
  collisions

abstract:
  It is shown that the dominant decay mode of $\vec\omega \to \pi^+ \pi^-
\pi^0$ can be employed to determine the Fano statistical tensor $t^2_0$ of
$\vec \omega$ with respect to the quantization axis normal to the decay plane.
In $pp \to pp \vec \omega$ one can choose decay planes with different
orientations for a given $\omega$ direction, $\theta$. By choosing three
different experimentally convenient orientations of the decay planes for the
same $\theta$, one may determine empirically the $t^2_0$ and $t^2_{\pm 2}$
characterising the tensor polarization of $\omega$ in the Transverse Frame for
$pp \to pp \vec \omega$.


title:
Effective Range Corrections in Few-Body Systems with large Scattering
  Length

abstract:
  The effective field theory with contact interactions alone is a powerful tool
to compute low-energy observables for three-body systems with large scattering
length. Recent calculations including effective range corrections are discussed
and results are presented.


title:
Complex coupled-cluster approach to an ab-initio description of open
  quantum systems

abstract:
  We develop ab-initio coupled-cluster theory to describe resonant and weakly
bound states along the neutron drip line. We compute the ground states of the
helium chain 3-10He within coupled-cluster theory in singles and doubles (CCSD)
approximation. We employ a spherical Gamow-Hartree-Fock basis generated from
the low-momentum N3LO nucleon-nucleon interaction. This basis treats bound,
resonant, and continuum states on equal footing, and is therefore optimal for
the description of properties of drip line nuclei where continuum features play
an essential role. Within this formalism, we present an ab-initio calculation
of energies and decay widths of unstable nuclei starting from realistic
interactions.


title:
Semi-Classical Approach to the Two-Level Pairing Model --Various Aspects
  of Phase Change--

abstract:
  Aspects of the phase change of the two-level pairing model are investigated
in the semi-classical treatment by using the variational approch with the
mixed-mode coherent state. In the classical limit, $hbar \to 0$, the sharp
phase transition appears and the two phases exist in the region where the force
strength is larger than a certain critical value. However, it is shown that, in
the semi-classical treatment, the above-mentioned behavior of the phase change
disappears in the analytical and the numerical treatments. As a result, new
understanding about aspects of the phase change in this model is given.


title:
Classical and Quantal Descriptions of Small Amplitude Fluctuations
  Around Equilibriums in the Two-Level Pairing Model

abstract:
  Various classical counterparts for the two-level pairing model in a
many-fermion system are presented in the Schwinger boson representation. It is
shown that one of the key ingredients giving the classical descriptions for
quantal system is the use of the various trial states besides the $su(2)\otimes
su(2)$-coherent state, which may be natural selection for the two-level pairing
model governed by the $su(2)\otimes su(2)$-algebra. It is pointed out that the
fictitious behavior like the sharp phase transition can be avoided by using the
other states such as the $su(2)\otimes su(1,1)$- and the $su(1,1)\otimes
su(1,1)$-coherent states, while the sharp phase transition appears in the usual
Hartree-Fock-Bogoliubov and the quasi-particle random phase approximations in
the original fermion system.


title: Scaling of anisotropy flows in intermediate energy heavy ion collisions

abstract:
  Anisotropic flows ($v_1$, $v_2$ and $v_4$) of light nuclear clusters are
studied by a nucleonic transport model in intermediate energy heavy ion
collisions. The number-of-nucleon scalings of the directed flow ($v_1$) and
elliptic flow ($v_2$) are demonstrated for light nuclear clusters. Moreover,
the ratios of $v_4/v_2^2$ of nuclear clusters show a constant value of 1/2
regardless of the transverse momentum. The above phenomena can be understood by
the coalescence mechanism in nucleonic level and are worthy to be explored in
experiments.


title: A meson-exchange piN model up to energies sqrt(s) < 2.0 GeV

abstract:
  A meson-exchange piN model, previously constructed using three-dimensional
reduction scheme of the Bethe-Salpeter equation for a model Lagrangian
involving \pi, \eta, N, \Delta, rho, and \sigma fields, is extended to energies
up to 2 GeV by including the \eta N channel and all the four stars \pi N
resonances up to the F-waves. The effects of other 2 pion channels are taken
into account phenomenologically. The extended model gives an excellent fit to
both piN phase shifts and inelasticity parameters in all channels up to the
F-waves. However, a few of the extracted resonance parameters differ
considerably from the PDG values.


title: Nuclear dynamics in time-dependent picture

abstract:
  Using the time-dependent theory of quantum mechanics, we investigate nuclear
electric dipole responses. The time evolution of a wave function is explicitly
calculated in the coordinate-space representation. The particle continuum is
treated with the absorbing boundary condition. Calculated time-dependent
quantities are transformed into those of familiar energy representation. We
apply the method to a three-body model for 11Li and to the mean-field model for
22O, then discuss properties of E1 response.


title: Real-time Skyrme TDHF dynamics of giant resonances

abstract:
  Nuclear dynamics of giant resonances are investigated with the real-time
Skyrme TDHF method. The TDHF equation is explicitly linearized with respect to
variation of single-particle wave functions. The time evolution of transition
densities are calculated for giant dipole resonances. The time-dependent
densities of protons and neutrons suggest that the dynamics of giant dipole
resonance in neutron-rich nuclei are significantly different from that in
stable nuclei with N=Z.


title: Pseudospin symmetry and structure of nuclei with $Z\ge$ 100

abstract:
  In the framework of the Relativistic Mean Field Approach a pseudospin
dependence of the residual forces in nuclei is considered. It is shown that
this dependence is relatively weak. As a consequence, a pseudospin dependence
of the particle--core coupling is weak as well. This leads to a small splitting
of the pseudospin doublets produced by a vector coupling of an odd particle
pseudospin and a pseudo--orbital momentum of the core. Some possibilities for
experimental investigations of the manifestations of the pseudospin symmetry in
the spectra of odd nuclei with $Z\ge$ 100 are indicated.


title: Theory and Phenomenology of Hadrons

abstract:
  This Dyson-Schwinger equation (DSE) aperc,u highlights recent applications to
mesons. It reports features of, and results for, pseudoscalar and scalar
bound-state residues in vacuum polarisations, and exhibits how a restoration of
chiral symmetry in meson trajectories could be manifest in a relationship
between them. It also touches on nucleon studies, emphasising the importance of
both scalar and axial-vector diquark correlations, and reporting the
calculation of mu_n G_E^n(Q^2)/G_M^n(Q^2). The value of respecting symmetries,
including Poincare' covariance, is stressed.


title:
The electromagnetic Nucleon to Delta transition in Chiral Effective
  Field Theory

abstract:
  We present a calculation of the three complex form factors parametrizing the
nucleon to Delta transition matrix element in the framework of chiral effective
field theory with explicit Delta degrees of freedom. The interplay between
short and long range physics is discussed and estimates for systematic
uncertainties due to higher order effect are given.


title: Direct Reactions with Exotic Nuclei, Nuclear Structure and Astrophysics

abstract:
  Intermediate energy Coulomb excitation and dissociation is a useful tool for
nuclear structure and astrophysics studies. Low-lying strength in nuclei far
from stability was discovered by this method. The effective range theory for
low-lying strength in one-neutron halo nuclei is summarized and extended to
two-neutron halo nuclei. This is of special interest in view of recent rather
accurate experimental results on the low-lying electric dipole strength in
$^{11}$Li. Another indirect approach to nuclear astrophysics is the Trojan
horse method. It is pointed out that it is a suitable tool to investigate
subthreshold resonances.


title:
Rapidity-dependent spectra from a single-freeze-out model of
  relativistic heavy-ion collisions

abstract:
  An extension of the single-freeze-out model with thermal and geometric
parameters dependent on the spatial rapidity, $\alpha_\parallel$, is used to
describe the rapidity and transverse-momentum spectra of pions, kaons, protons,
and antiprotons measured at RHIC at $\sqrt{s_{NN}}=200 {\rm GeV}$ by the BRAHMS
collaboration. {\tt THERMINATOR} is used to perform the necessary simulation,
which includes all resonance decays. The result of the fit to the rapidity
spectra in the range of the BRAHMS data is the expected growth of the baryon
and strange chemical potentials with the magnitude of $\alpha_\parallel$, while
the freeze-out temperature is kept fixed. The value of the baryon chemical
potential at $\alpha_\parallel \sim 3$, which is the relevant region for
particles detected at the BRAHMS forward rapidity $y \sim 3$, is about $200
{\rm GeV}$, {\em i.e.} lies in the range of the values obtained for the highest
SPS energy. The chosen geometry of the fireball has a decreasing transverse
size as the magnitude of $\alpha_\parallel$ is increased, which also
corresponds to decreasing transverse flow. This feature is verified by
reproducing the transverse momentum spectra of pions and kaons at various
rapidities. The strange chemical potential obtained from the fit to the
$K^+/K^-$ ratio is such that the local strangeness density in the fireball is
compatible with zero. The resulting rapidity spectra of net protons are
described qualitatively in the model. As a result of the study, the knowledge
of the ``topography'' of the fireball is achieved, making other calculations
possible. As an example, we give predictions for the rapidity spectra of
hyperons.


title: Phase transition from hadronic matter to quark matter

abstract:
  We study the phase transition from nuclear matter to quark matter within the
SU(3) quark mean field model and NJL model. The SU(3) quark mean field model is
used to give the equation of state for nuclear matter, while the equation of
state for color superconducting quark matter is calculated within the NJL
model. It is found that at low temperature, the phase transition from nuclear
to color superconducting quark matter will take place when the density is of
order 2.5$\rho_0$ - 5$\rho_0$. At zero density, the quark phase will appear
when the temperature is larger than about 148 MeV. The phase transition from
nuclear matter to quark matter is always first order, whereas the transition
between color superconducting quark matter and normal quark matter is second
order.


title:
Study of possible \omega bound states in nuclei with the (\gamma,p)
  reaction

abstract:
  We perform calculations for \omega production in nuclei by means of the
(\gamma,p) reaction for photon energies and proton angles suited to running and
future experiments in present Laboratories. For some cases of possible \omega
optical potentials we find clear peaks which could be observable provided a
good resolution in the \omega energy is available. We also study the inclusive
production of \pi^0 \gamma in nuclei around the \omega energy and find a double
hump structure for the energy spectra, with a peak around a \pi^0 \gamma energy
of m_{\omega}-100 MeV, which could easily be misidentified by a signal of a
bound \omega state in nuclei, while it is due to a different scaling of the
uncorrelated \pi^0 \gamma production and \omega production with subsequent
\pi^0 \gamma decay.


title:
Lambda alpha, Sigma alpha and Xi alpha potentials derived from the SU6
  quark-model baryon-baryon interaction

abstract:
  We calculate Lambda alpha, Sigma alpha and Xi alpha potentials from the
nuclear-matter G-matrices of the SU6 quark-model baryon-baryon interaction. The
alpha-cluster wave function is assumed to be a simple harmonic-oscillator
shell-model wave function. A new method is proposed to derive the direct and
knock-on terms of the interaction Born kernel from the hyperon-nucleon
G-matrices, with explicit treatments of the nonlocality and the center-of-mass
motion between the hyperon and alpha. We find that the SU6 quark-model
baryon-baryon interactions, FSS and fss2, yield a reasonable bound-state energy
for 5 He Lambda, -3.18 -- -3.62 MeV, in spite of the fact that they give
relatively large depths for the Lambda single-particle potentials, 46 -- 48
MeV, in symmetric nuclear matter. An equivalent local potential derived from
the Wigner transform of the nonlocal Lambda alpha kernel shows a strong energy
dependence for the incident Lambda-particle, indicating the importance of the
strangeness-exchange process in the original hyperon-nucleon interaction. The
Sigma alpha and Xi alpha potentials are repulsive with the attractive isospin
I=1/2 (Sigma alpha) and I=0 (Xi alpha) components and the repulsive I=3/2
(Sigma alpha) and I=1 (Xi alpha) components.


title: An extended Vlasov equation with pairing correlations

abstract:
  A simplified version of the Wigner--transformed time--dependent
Hartree--Fock--Bogoliubov equations, leading to a solvable model for finite
systems of fermions with pairing correlations, is introduced. In this model,
pairing correlations result in a coupling of the Vlasov--type equation for the
normal phase--space density with that for the imaginary part of the anomalous
density. The effect of pairing correlations on the linear response of the
system is studied for a finite one--dimensional system and an explicit
expression for the correlated propagator is given.


title: Time evolution of Mach-like structure in a partonic transport model

abstract:
  The time evolution of Mach-like structure (the splitting of the away side
peak in di-hadron $\Delta\phi$ correlation) is presented in the framework of a
dynamical partonic transport model. With the increasing of the lifetime of
partonic matter, Mach-like structure can be produced and developed by strong
parton cascade process. Not only the splitting parameter but also the number of
associated hadrons ($N_{h}^{assoc}$) increases with the lifetime of partonic
matter and partonic interaction cross section. Both the explosion of
$N_{h}^{assoc}$ following the formation of Mach-like structure and the
corresponding results of three-particle correlation support that a partonic
Mach-like shock wave can be formed by strong parton cascade mechanism.
Therefore, the studies about Mach-like structure may give us some critical
information, such as the lifetime of partonic matter and hadronization time.


title:
Dominant $2\pi\gamma$-exchange nucleon-nucleon interaction: Spin-spin
  and tensor potentials

abstract:
  We calculate at two-loop order in chiral perturbation theory the
electromagnetic corrections to the two-pion exchange nucleon-nucleon
interaction that is generated by the isovector spin-flip $\pi\pi NN$
contact-vertex proportional to the large low-energy constant $c_4\simeq 3.4
$GeV$^{-1}$. We find that the respective $2\pi\gamma$-exchange potentials
contain sizeable isospin-breaking components which reach up to -4% of
corresponding isovector $2\pi$-exchange potentials. The typical values of these
novel charge-independence breaking spin-spin and tensor potentials are $-0.11
$MeV and $0.09 $MeV, at a nucleon distance of $r=m_\pi^{-1}=1.4 $fm. The
charge-symmetry breaking spin-spin and tensor potentials come out a factor of
2.4 smaller. Our analytical results for these presumably dominant
isospin-violating spin-spin and tensor NN-forces are in a form such that they
can be easily implemented into phase-shift analyses and few-body calculations.


title: Overview of Antikaon-Nuclear Quasi-Bound States

abstract:
  Experimental evidence for antikaon-nuclear quasi-bound states is briefly
reviewed. Theoretical and phenomenological arguments for and against the
existence of such states are considered, based on constructing antikaon-nuclear
optical potentials from various sources. Results of RMF calculations that
provide a lower limit of Gamma(antikaon) = 50 +/- 10 MeV on the width of
antikaon-nuclear quasi-bound states are discussed.


title: The fractional symmetric rigid rotor

abstract:
  Based on the Riemann fractional derivative the Casimir operators and
multipletts for the fractional extension of the rotation group SO(n) are
calculated algebraically. The spectrum of the corresponding fractional
symmetric rigid rotor is discussed. It is shown, that the rotational,
vibrational and $\gamma$-unstable limits of the standard geometric collective
models are particular limits of this spectrum. A comparison with the ground
state band spectra of nuclei shows an agreement with experimental data better
than 2%. The derived results indicate, that the fractional symmetric rigid
rotor is an appropriate tool for a description of low energy nuclear
excitations.


title:
Collective inertia and fission barriers within the Skyrme-Hartree-Fock
  theory

abstract:
  Spontaneous fission barriers, quadrupole inertia, and zero-point
quadrupole-energy corrections are calculated for 252,256,258Fm in the framework
of the self-consistent Skyrme-Hartree-Fock+BCS theory. Two ways of computing
dynamical inertia are employed: the Gaussian Overlap Approximation to the
Generator Coordinate Method and cranking ansatz. The Skyrme results are
compared with those of the Gogny-Hartree-Fock-Bogolyubov model.


title: Neutrino-nucleus reactions in the delta resonance region

abstract:
  Reliable estimates of neutrino-nucleus reactions in the resonance-excitation
region play an important role in many of the on-going and planned neutrino
oscillation experiments. We study here neutrino-nucleus reactions in the
delta-particle excitation region with the use of neutrino pion-production
amplitudes calculated in a formalism in which the resonance contributions and
the background amplitudes are treated on the same footing. Our approach leads
to the neutrino-nucleus reaction cross sections that are significantly
different from those obtained in the conventional approach wherein only the
pure resonance amplitudes are taken into account. To assess the reliability of
our formalism, we calculate the electron-nucleus scattering cross sections in
the same theoretical framework; the calculated cross sections agree reasonably
well with the existing data.


title:
Observables in elastic electron-deuteron scattering with two-photon
  exchange

abstract:
  The general form of the cross section as well as the polarizations of
electron-deuteron elastic scattering are given. Two-photon exchange effects are
analyzed. Possible signatures of the two-photon exchange effects in the
electron-deuteron elastic scattering are discussed.


title:
Nonmesonic weak decay of $\Lambda$ hypernuclei within a nuclear matter
  framework

abstract:
  The nonmesonic weak decay of $\Lambda$ hypernuclei is studied using nuclear
matter. We have developed a formalism which gives a microscopic interpretation
of the process of emission of particles originated in this decay. More
specifically, our scheme provides a unified treatment of $\Gamma(\Lambda N \to
NN$) and $N_{N}$ ($N_{NN}$), the $\Lambda$ non-mesonic weak decay widths and
the number of emitted particles (pair of particles) of kind $N$ ($NN$),
respectively. We have also evaluated for the first time the quantum
interference terms between the $n$- and $p$-induced weak decay amplitudes.
Explicit expressions for $N_{N}$ and $N_{NN}$ are shown within the ring
approximation. Using the local density approximation together with the ring
approximation, we report results for the decay of the $^{12}_{\Lambda}C$
hypernucleus. We have obtained values for the ratio $N_{n}/N_{p}$
($N_{nn}/N_{np}$) in the range $1.4-1.6$ ($0.2-0.3$), where no energy threshold
have been employed. The $n$- and $p$-induced interference terms modify in less
than $\sim 3 %$ these results.


title:
Low-lying resonances of Be9Lambda : Faddeev calculation with
  Pade-approximants

abstract:
  Configuration space Faddeev equations are applied to describe the Be9Lambda
low-lying resonances of the ground band in the alpha+alpha+Lambda cluster
model. The method of analytical continuation in coupling constant is used.


title: Nuclei with Tetrahedral Symmetry

abstract:
  We discuss a point-group-theory based method of searching for new regions of
nuclear stability. We illustrate the related strategy with realistic
calculations employing the tetrahedral and the octahedral point groups. In
particular, several nuclei in the Rare Earth region appear as excellent
candidates to study the new mechanism.


title: Nucleon-nucleon momentum correlation function for light nuclei

abstract:
  Nucleon-nucleon momentum correlation function have been presented for nuclear
reactions with neutron-rich or proton-rich projectiles using a nuclear
transport theory, namely Isospin-Dependent Quantum Molecular Dynamics model.
The relationship between the binding energy of projectiles and the strength of
proton-neutron correlation function at small relative momentum has been
explored, while proton-proton correlation function shows its sensitivity to the
proton density distribution. Those results show that nucleon-nucleon
correlation function is useful to reflect some features of the neutron- or
proton-halo nuclei and therefore provide a potential tool for the studies of
radioactive beam physics.


title:
Saturation properties of nuclear matter in a relativistic mean field
  model constrained by the quark dynamics

abstract:
  We have built an effective Walecka-type hadronic Lagrangian in which the
hadron masses and the density dependence of the coupling constants are deduced
from the quark dynamics using a Nambu-Jona-Lasinio model. In order to stabilize
nuclear matter an eight-quark term has been included. The parameters of this
Nambu-Jona-Lasinio model have been determined using the meson properties in the
vacuum but also in the medium through the omega meson mass in nuclei measured
by the TAPS collaboration. Realistic properties of nuclear matter have been
obtained.


title:
Final State Interaction in Neutron Deuteron Charge Exchange Reaction at
  Small Transfer Momentum

abstract:
  Analysis of the $nd\to p(nn)$ reaction in a Gev-energy region is performed in
the framework based on the multiple-scattering theory for the few nucleon
system. The special kinematic condition, when momentum transfer from neutron
beam to final proton closes to zero, is considered. The possibility to extract
the spin-flip term of the elementary $np\to pn $ amplitude from nd-breakup
process is investigated. The energy dependence of the ratio
  $R=\frac{d\sigma_{nd}} {d\Omega} / \frac{d\sigma_{np}}{d\Omega}$ is obtained
taking account of the final state interaction two outgoing neutrons in $^1
S_0$-state.


title: Pairing and alpha-decay

abstract:
  Nuclear pairing interaction plays a crucial role in both
macroscopic-microscopic and fully macroscopic descriptions of nuclei. In the
present study we discuss different pairing interactions (monopole and delta
pairing forces) and the methods allowing for the particle number symmetry
restoration in addition to the customary BCS treatment of pairing correlations
in the context of $\alpha$-decay half-lives for superheavy nuclei. The
calculations are done in the macroscopic-microscopic framework for even-even
nuclei with Z > 110.


title:
Prescriptions for the scaling variable of the nucleon structure function
  in nuclei

abstract:
  We tested several choices of the in-medium value of the Bjorken scaling
variable assuming the nucleon structure function in nucleus to be the same as
that of free nucleon. The results unambiguously show that it is different.


title: Particle number conserving approach to correlations

abstract:
  In the present work the so-called Higher Tamm-Dancoff Apporximation method is
presented for the generalized case of isovector and isoscalar residual
interactions treated simultaneously. The role of different particle-hole
excitations and of proton-neutron pairing correlations in the ground state of
the self-conjugate 64Ge nucleus is discussed.


title:
Saturation properties of nuclear matter in a relativistic mean field
  model constrained by quark dynamics

abstract:
  We have built an effective Walecka-type hadronic Lagrangian in which the
hadron masses and the density dependence of the coupling constants are deduced
from the quark dynamics using a Nambu-Jona-Lasinio model. The parameters of
this Nambu-Jona-Lasinio model have been determined using the meson properties
in the vacuum but also in the medium through the omega meson mass in nuclei
measured by the TAPS collaboration. Realistic properties of nuclear matter have
been obtained.


title:
Universal Properties of the Four-Body System with Large Scattering
  Length

abstract:
  Few-body systems with large scattering length have universal properties that
do not depend on the details of their interactions at short distances. We study
the universal bound state properties of the four-boson system with large
scattering length in an effective quantum mechanics approach. We compute the
four-body binding energies using the Yakubovsky equations for positive and
negative scattering length. Moreover, we study the correlation between three-
and four-body energies and present a generalized Efimov plot for the four-body
system. These results are useful for understanding the cluster structure of
nuclei and for the creation of weakly-bound tetramers with cold atoms close to
a Feshbach resonance.


title: Comments on the electromagnetic decay of $\Lambda (1520)$

abstract:
  The electromagnetic decay processes of excited hyperon states are a very
sensitive probe of the structure of hyperons. We will argue that the recent
measurements of electromagnetic decay rates indicate that the wave functions of
the hyperon ground states should contain sizeable components of excited quark
states (configuration mixing). Flavor-SU(3) is a broken symmetry and it appears
that the hyperon wave functions should preferably be written in a $uds$-basis,
where only the light $u$ and $d$ quarks are symmetrized, and not in the usual
SU(6)-basis.


title: Stress-free BCS pairing in color superconductors is impossible

abstract:
  Cold, asymptotically dense three-flavor quark matter is in the color-flavor
locked (CFL) phase, in which all quarks pair in a particularly symmetric
fashion. At smaller densities, taking into account a nonzero strange quark mass
and electric and color neutrality, the CFL phase requires pairing of quarks
with mismatched Fermi momenta. We present a classification of all other
possible, less symmetric, pairing patterns and prove that none of them can
avoid this mismatch. This result suggests unconventional, e.g., spatially
inhomogeneous, superconducting phases for moderate densities.


title: Causal Viscous Hydrodynamics for Central Heavy-Ion Collisions

abstract:
  We study causal viscous hydrodynamics in the context of central relativistic
heavy-ion collisions and provide details of a straightforward numerical
algorithm to solve the hydrodynamic equations. It is shown that correlation
functions of fluctuations provide stringent test cases for any such numerical
algorithm. Passing these tests, we study the effects of viscosity on the
temperature profile in central heavy-ion collisions. Also, we find that it is
possible to counter-act the effects of viscosity to some extent by re-adjusting
the initial conditions. However, viscous corrections are strongest for
high-mass particles, signaling the breakdown of hydrodynamic descriptions for
large eta/s.


title: Relativistic Calculation of Hadronic Baryon Decays

abstract:
  The description of baryon resonance decays represents a major challenge of
strong interaction physics. We will report on a relativistic approach to
mesonic decays of light and strange baryon resonances within constituent quark
models. The calculations are performed in the point-form of relativistic
quantum mechanics, specifically focussing on the strange sector. It is found
that the relativistic predictions generally underestimate the experimental
data. The nonrelativistic approximation of the approach leads to the decay
operator of the elementary emission model. It is seen that the nonrelativistic
reduction has considerable effects on the decay widths.


title: Probing effective nucleon-nucleon interaction at band termination

abstract:
  Low-energy nuclear structure is not sensitive enough to resolve fine details
of nucleon-nucleon (NN) interaction. Insensitivity of infrared physics to the
details of short-range strong interaction allows for consistent, free of
ultraviolet divergences, formulation of local theory at the level of local
energy density functional (LEDF) including, on the same footing, both
particle-hole as well as particle-particle channels. Major difficulty is
related to parameterization of the nuclear LEDF and its density dependence. It
is argued that structural simplicity of terminating or isomeric states offers
invaluable source of informations that can be used for fine-tuning of the NN
interaction in general and the nuclear LEDF parameters in particular. Practical
applications of terminating states at the level of LEDF and nuclear shell-model
are discussed.


title: Hadronic Decays and Baryon Structure

abstract:
  Relativistic constituent quark models generally describe three-quark systems
with particular interactions. The corresponding invariant mass eigenvalue
spectra and pertinent eigenstates should exhibit the multiplet structure
anticipated for baryon resonances. Taking into account the flavour content,
spin structure, and spatial distribution of the baryon wave functions together
with mass relations of the eigenvalues and decay properties of the eigenstates,
we can link the theoretical mass eigenstates with the experimentally measured
resonances. The resulting classification of baryon resonances differs in some
respects from the one suggested by the Particle Data Group. With regard to the
hadronic decay widths of light and strange baryon resonances a consistent
picture emerges only, if the classification includes two-star resonances.


title: Overview of Dynamic Models for gamma N -> Delta

abstract:
  We present an overview of dynamic and related models for pion
electroproduction on the nucleon due to Delta(1232) excitation. The
electromagnetic multipoles and their ratios obtained from these models and from
effective field theories are compared, and the existing contradictory results
for the pion cloud effects are discussed.


title: Nucleon Resonance Excitation with Virtual Photons

abstract:
  The unitary isobar model MAID is used for a partial wave analysis of pion
photoproduction and electroproduction data on the nucleon. In particular we
have taken emphasis on the region of the Delta(1232) resonance and have
separated the resonance and background amplitudes with the K-matrix approach.
This leads to electromagnetic properties of the dressed Delta resonance, where
all multipole amplitudes become purely imaginary and all form factors and
helicity amplitudes become purely real at the K-matrix pole of W=M_Delta=1232
MeV. The REM=E2/M1 and RSM=C2/M1 ratios of the quadrupole excitation are
compared to recent data analysis of different groups. The REM ratio of MAID2005
agrees very well with the data and has a linear behavior over the whole
experimentally explored Q^2 region with a small positive slope that predicts a
zero crossing around 3.5 GeV^2. The recent RSM data for Q^2 < 0.2 GeV^2
indicate a qualitative change in the shape of the ratio which can be explained
by the impact of the Siegert theorem at pseudothreshold (Q^2=-0.086 GeV^2) in
the unphysical region.


title: Photoproduction of eta and etaprime mesons on the nucleon

abstract:
  The isobar models eta-MAID and eta'-MAID have been used to analyze new data
on quasi-free eta photoproduction on the deuteron from Bonn and recent eta'
data on the proton from Jlab. In eta photoproduction on the neutron a bump
around W=1700 MeV was observed which could possibly arise from a narrow P11
state that is discussed as a non-strange member of the Theta^+ anti-decuplett.
In eta' photoproduction on the proton resonance contributions are found that
can be attributed to missing resonances in the energy region around W=1900 MeV.


title:
Coulomb corrections in quasi-elastic scattering based on the eikonal
  expansion for electron wave functions

abstract:
  An eikonal expansion is developed in order to provide systematic corrections
to the eikonal approximation through order 1/k^2, where k is the wave number.
The expansion is applied to wave functions for the Klein-Gordon equation and
for the Dirac equation with a Coulomb potential. Convergence is rapid at
energies above about 250 MeV. Analytical results for the eikonal wave functions
are obtained for a simple analytical form of the Coulomb potential of a
nucleus. They are used to investigate distorted-wave matrix elements for
quasi-elastic electron scattering from a nucleus. Focusing factors are shown to
arise from the corrections to the eikonal approximation. A precise form of the
effective-momentum approximation is developed by use of a momentum shift that
depends on the electron's energy loss.


title: Understanding nuclear "pasta": current status and future prospects

abstract:
  In cores of supernovae and crusts of neutron stars, nuclei can adopt
interesting shapes, such as rods or slabs, etc., which are referred to as
nuclear "pasta." In recent years, we have studied the pasta phases focusing on
their dynamical aspects with a quantum molecular dynamic (QMD) approach. In
this article, we review these works. We also focus on the treatment of the
Coulomb interaction.


title:
Nucleon-nucleon wave function with short-range nodes and high-energy
  deuteron photodisintegration

abstract:
  We review a concept of the Moscow potential (MP) of the $NN$ interaction. On
the basis of this concept we derive by quantum inversion optical partial
potentials from the modern partial-wave analysis (PWA) data and deuteron
properties. Point-form (PF) relativistic quantum mechanics (RQM) is applied to
the two-body deuteron photodisintegration. Calculations of the cross-section
angular distributions cover photon energies between 1.1 and 2.5 GeV. Good
agreement between our theory and recent experimental data confirms the concept
of deep attractive Moscow potential with forbidden $S$- and $P$-states.


title:
Angular-momentum projection of cranked symmetry-unrestricted Slater
  determinants

abstract:
  We report on development of a new feature of the code HFODD, allowing for the
angular-momentum projection of cranked symmetry-unrestricted Slater
determinants. After a brief overview of the main theoretical building blocks
and formalism, we present several preliminary applications. In particular, we
discuss the case of a well-deformed rotational band in 156Gd, and we show the
emergence of uncompensated poles in the overlap kernels calculated in an odd-A
nucleus 155Eu.


title:
Microscopic Model Analysis of the $^{6}$He,$^{6}$Li+$^{28}$Si Total
  Reaction Cross Sections at the Energy Range 5-50 a Mev

abstract:
  The existing and some preliminary experimental data on the total cross
sections of the $^{4,6}$He, $^{6,7}$Li +$^{28}$Si reactions at energies E=5-50
A MeV are demonstrated. The data on $^{6}$Li,$^{6}$He+$^{28}$Si are analyzed in
the framework of the microscopic optical potential with real and imaginary
parts obtained with a help of the double-folding procedure and by using the
current models of densities of the projectile nuclei. Besides, the microscopic
double-folding Coulomb potential is calculated and its effect on cross sections
is compared with that when one applies the traditional Coulomb potential of the
uniform charge distribution. The semi-microscopic potentials are constructed
from both the renormalized microscopic potentials and their derivatives to take
into account collective motion effect and to improve an agreement with
experimental data.


title:
Dark Matter in the Cosmos- Exploiting the Signatures of its Interaction
  with Nuclei

abstract:
  We review various issues related to the direct detection of constituents of
dark matter, which are assumed to be Weakly Interacting Massive Particles
(WIMPs). We specifically consider heavy WIMPs such as: 1) The lightest
supersymmetric particle LSP or neutralino. 2) The lightest Kaluza-Klein
particles in theories of extra dimensions and 3) other extensions of the
standard model. In order to get the event rates one needs information about the
structure of the nucleon as well as as the structure of the nucleus and the
WIMP velocity distribution. These are also examined
  Since the expected event rates for detecting the recoiling nucleus are
extremely low and the signal does not have a characteristic signature to
discriminate them against background we consider some additional aspects of the
WIMP nucleus interaction, such as the periodic behavior of the rates due to the
motion of Earth (modulation effect). Since, unfortunately, this is
characterized by a small amplitude we consider other options such as
directional experiments, which measure not only the energy of the recoiling
nuclei but their direction as well. In these, albeit hard, experiments one can
exploit two very characteristic signatures: a)large asymmetries and b)
interesting modulation patterns. Furthermore we extended our study to include
evaluation of the rates for other than recoil searches such as: i) Transitions
to excited states, ii) Detection of recoiling electrons produced during the
neutralino-nucleus interaction and iii) Observation of hard X-rays following
the de-excitation of the ionized atom.


title: Conical flow due to partonic jets in central Au+Au collisions

abstract:
  In jet quenching, a hard QCD parton, before fragmenting into a jet of
hadrons, deposits a fraction of its energy in the medium, leading to suppressed
production of high-$p_T$ hadrons. The process can generate shock waves. We
study the distortion of Mach shock waves due to jet quenching in central Au+Au
collisions and its effect on particle production. Finite fluid velocity and
inhomogeneity of the medium can distort the Mach shock front significantly such
that the inside shock front disappear and the outside shock front is opened up.
We also show that the STAR data on azimuthal distribution of background
subtracted secondaries, associated with high $p_T$ trigger, are reasonably well
explained by the excess pions produced due to partonic energy loss.


title: The K/pi ratio and the lifespan of the fireball

abstract:
  We construct a hadronic kinetic model for description of excitation functions
of multiplicity ratios K+/pi+, K-/pi-, and Lambda/pi. It is shown that the
model is able to describe data rather well under the assumption that the total
lifespan of the fireball is decreasing function of the collision energy for SPS
energies above 30 AGeV. Thus in order to identify the onset of deconfinement
the proposed model will have to be checked against other kinds of data until
hadronic description can be safely falsified.


title: Ground state correlations and structure of odd spherical nuclei

abstract:
  It is well known that the Pauli principle plays a substantial role at low
energies because the phonon operators are not ideal boson operators.
Calculating the exact commutators between the quasiparticle and phonon
operators one can take into account the Pauli principle corrections. Besides
the ground state correlations due to the quasiparticle interaction in the
ground state influence the single particle fragmentation as well. In this
paper, we generalize the basic QPM equations to account for both mentioned
effects. As an illustration of our approach, calculations on the structure of
the low-lying states in $^{131}$Ba have been performed.


title: Realistic and effective interactions in the study of nuclear matter

abstract:
  The equation of state of symmetric nuclear matter is addressed starting both
from a realistic interaction derived from nucleon-nucleon scattering processes
and from a low-momentum effective potential. The approach is based on finite
temperature Green's functions. The internal energy per particle is estimated
from the summation of diagrams and through the Galitskii-Koltun's sum rule.


title: Source chaoticity in relativistic heavy ion collisions at SPS and RHIC

abstract:
  We investigate degree of coherence of pion sources produced in relativistic
heavy ion collisions using multi-particle interferometry. In order to obtain
``true'' chaoticity, lambda^true from two-pion correlation functions measured
in experiments, we make a correction for long-lived resonance decay
contributions. Using this lambda^true and the weight factor which are obtained
from parameter fitted to two- and three-pion correlation function, we calculate
a chaotic fraction epsilon and the number of coherent sources alpha for
different colliding energies. The result gives constraints on the source and
shows an increase of the minimum number of alpha with multiplicity, although
multiplicity independent chaoticity is not excluded.


title:
Analysis of (K^-,K^+) inclusive spectrum with semiclassical distorted
  wave model

abstract:
  The inclusive K^+ momentum spectrum in the 12C(K^-,K^+) reaction is
calculated by the semiclassical distorted wave (SCDW) model, including the
transition to the \Xi^- bound state. The calculated spectra with the strength
of the \Xi^--nucleus potential -50, -20, and +10 MeV are compared with the
experimental data measured at KEK with p_{K^-}=1.65 GeV/c. The shape of the
spectrum is reproduced by the calculation. Though the inclusive spectrum
changes systematically depending on the potential strength, it is not possible
to obtain a constraint on the potential from the present data. The calculated
spectrum is found to have strong emission-angle dependence. We also investigate
the incident K^- momentum dependence of the spectrum to see the effect of the
Fermi motion of the target nucleons which is explicitly treated in the SCDW
method.


title: Propagation of strangelets in the Earth's atmosphere

abstract:
  A new model for the description of the behaviour of strangelets in the
Earth's atmosphere is presented. Strangelet fission induced by collision with
air nuclei is included. It is shown that strangelets with certain parameters of
initial mass and energy may reach depths near sea level, which can be examined
by ground-based experiments.


title: Factorization for hadronic heavy quarkonium production

abstract:
  We briefly review several models of heavy quarkonium production in hadronic
collisions, and discuss the status of QCD factorization for these production
models.


title: Longitudinal flow and onset of deconfinement

abstract:
  The effects of the onset of deconfinement on longitudinal and transverse flow
are studied. First, we analyze longitudinal pion spectra from $E_{\rm lab}= 2A$
GeV to $\sqrt{s_{\rm NN}}=200$ GeV within Landau's hydrodynamical model and the
UrQMD transport approach. From the measured data on the widths of the pion
rapidity spectra, we extract the sound velocity $c_s^2$ in the early stage of
the reactions. It is found that the sound velocity has a local minimum
(indicating a softest point in the equation of state, EoS) at $E_{\rm
beam}=30A$ GeV. This softening of the EoS is compatible with the assumption of
the formation of a mixed phase at the onset of deconfinement. Furthermore, the
energy excitation function of elliptic flow ($v_2$) from $E_{\rm beam}=90A$ MeV
to $\sqrt{s_{\rm NN}}=200$ GeV is explored within the UrQMD framework and
discussed in the context of the available data. The transverse flow should also
be sensitive to changes in the equation of state. Therefore, the
underestimation of elliptic flow by the UrQMD model calculation above $E_{\rm
lab}= 30A$ GeV might also be explained by assuming a phase transition from a
hadron gas to the quark gluon plasma around this energy. This would be
consistent with the model calculations, indicating a transition from hadronic
matter to ``string matter'' in this energy range.


title: Baryon-Strangeness Correlations from Hadron/String- and Quark-Dynamics

abstract:
  Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string
transport approach (UrQMD) and a dynamical quark recombination model (quark
molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to
$\sqrt{s_{NN}}=200$ GeV. As expected, we find that the hadron/string dynamics
shows correlations similar to a simple hadron gas. In case of the quark
molecular dynamics, we find that initially the $C_{BS}$ correlation is that of
a weakly interacting QGP but changes in the process of hadronization also to
the value for a hadron gas. Therefore, we conclude that the hadronization
process itself makes the initial baryon strangeness correlation unobservable.
To make an experimental study of this observable more feasible, we also
investigate how a restriction to only charged kaons and $\Lambda$'s (instead of
all baryons and all strange particles) influences the theoretical result on
$C_{BS}$. We find that a good approximation of the full result can be obtained
in this limit in the present simulation.


title:
Landau parameters for isospin asymmetric nuclear matter based on a
  relativistic model of composite and finite extension nucleons

abstract:
  We study the properties of cold asymmetric nuclear matter at high density,
applying the quark meson coupling model with excluded volume corrections in the
framework of the Landau theory of relativistic Fermi liquids. We discuss the
role of the finite spatial extension of composite baryons on dynamical and
statistical properties such as the Landau parameters, the compressibility, and
the symmetry energy. We have also calculated the low lying collective
eigenfrequencies arising from the collisionless quasiparticle transport
equation, considering both unstable and stable modes. An overall analysis of
the excluded volume correlations on the collective properties is performed.


title: Phase transition in exotic nuclei along the $N=Z$ line

abstract:
  The abrupt structure change from the nuclei of $N=Z \le 35$ to those of $N=Z
\ge 36$ is investigated by means of shell model calculations. The basic
features of the even-even and odd-odd nuclei under consideration are nicely
reproduced. A sudden jump of nucleons into the upper $g_{9/2}d_{5/2}$ shell at
$N=Z=36$ is found to be the main reason that causes the qualitative structure
difference. It is argued that the structure change can be viewed as a decisive
change of the mean field, or a phase transition, along the $N=Z$ line.


title:
Collective effects in a medium and a model of compound flow in
  relativistic heavy ion collisions

abstract:
  A new analytical approach is presented for analysis of two-particle azimuthal
correlations in heavy ion collisions at relativistic energies. This approach
suggests that elliptic flow measured by experiment has a compound structure,
namely, that it may come from superposition of several components. General
expressions have been derived for the two-particle correlation function
isolating the contribution due to anisotropic flow. The model of compound flow
takes into account the number of jets per event, average multiplicity per jet,
dependence of jet yield on the orientation with respect to the reaction plane,
and independent "soft" particle production.


title:
Dynamics of $^{1}S_0$ diproton formation in the $pd\to \{pp\}_sn$ and
  $pN\to \{pp\}_s\pi$ reactions in the GeV region

abstract:
  Mechanisms for the production of $^1S_0$ diproton pairs, ${pp}_s$, in the
$pd\to {pp}_s n$ reaction are studied at proton beam energies 0.5 -- 2 GeV in
kinematics similar to those of backward elastic $pd$ scattering. This reaction
provides valuable information on the short-range $NN$ and $pd$ interactions
that is complementary to that investigated in the well known $pd\to dp$ and
$dp\to p(0^\circ)X$ processes. The $pd\to {pp}_sn$ reaction is related to the
subprocesses $\pi^0 d\to pn$ and $pN\to {pp}_s \pi$ using two different
one--pion--exchange (OPE) diagrams. Within both these models a reasonable
agreement could be obtained with the data below 1GeV. The similar energy
dependence of the $pd\to\{pp\}_s n$ and $pd\to dp$ cross sections and the small
ratio of about 1.5% in the production of $\{pp\}_s$ to deuteron final states
follow naturally within the OPE models.


title: Nuclear effects in dAu collisions from recent RHIC data

abstract:
  Neutral pion (pi0) production is calculated in a leading order (LO)
perturbative QCD-based model in pp and dAu collisions at s^1/2=200 AGeV at
midrapidity. The model includes the transverse component of the initial parton
distribution. We compare our results for pp collision to experimental data at
RHIC energy. We repeat our calculation for the dAu collision and investigate
the interplay between shadowing and multiple scattering. In central $]dAu
collisions the influence of possible jet energy loss on cold nuclear matter is
discussed and numerical results are displayed.


title:
Fully Microscopic Calculations for Closed-Shell Nuclei with Realistic
  Nucleon-Nucleon Potentials

abstract:
  The ground-state energy of the doubly magic nuclei 4He and 16O has been
calculated within the framework of the Goldstone expansion starting from modern
nucleon-nucleon potentials. A low-momentum potential V-low-k has been derived
from the bare potential by integrating out its high-momentum components beyond
a cutoff Lambda. We have employed a simple criterion to relate this cutoff
momentum to a boundary condition for the two-nucleon model space spanned by a
harmonic-oscillator basis. Convergence of the results has been obtained with a
limited number of oscillator quanta.


title: Interaction of Regular and Chaotic States

abstract:
  Modelling the chaotic states in terms of the Gaussian Orthogonal Ensemble of
random matrices (GOE), we investigate the interaction of the GOE with regular
bound states. The eigenvalues of the latter may or may not be embedded in the
GOE spectrum. We derive a generalized form of the Pastur equation for the
average Green's function. We use that equation to study the average and the
variance of the shift of the regular states, their spreading width, and the
deformation of the GOE spectrum non-perturbatively. We compare our results with
various perturbative approaches.


title: Extraction of a_nn from pi- d -> n n gamma

abstract:
  I present a calculation of the pi- d -> n n gamma reaction to third order in
chiral perturbation theory. The short-distance physics of this reaction can be
constrained by relating it to several important low-energy weak reactions. The
theoretical error in a_nn extracted from this reaction can thus be reduced by a
factor larger than three to +-0.05 fm.


title: Korteweg - de Vries solitons in relativistic hydrodynamics

abstract:
  In a previous work, assuming that the nucleus can be treated as a perfect
fluid, we have studied the propagation of perturbations in the baryon density.
For a given equation of state we have derived a Korteweg - de Vries (KdV)
equation from Euler and continuity equations in non-relativistic hydrodynamics.
Here, using a more general equation of state, we extend our formalism to
relativistic hydrodynamics.


title:
Peculiarities in the Structure of Two-Particle States within the
  Bethe-Salpeter Approach

abstract:
  The two-fermion bound system is an attractive subject of atomic and
sub-atomic physics. Despite these systems are rather simple the study of
two-particle bound states is challenging and still remains a source of progress
in quantum theory. Here we present a new method of solving the Bethe Salpeter
equations for the bound states of spinor particles by using the expansion of
the vertex functions over the complete set of four-dimensional hyperspherical
harmonics. Within this method the BS equation is treated in a ladder
approximation for the cases of scalar, pseudoscalar and vector meson exchanges
with corresponding form factors. This method is shown to be effective and
stable.


title: Four-nucleon scattering: a new numerical approach

abstract:
  The AGS equations are solved for $n{}^3\mathrm{H}$ and $p{}^3\mathrm{He}$
scattering including the Coulomb interaction. Comparison with previous work
confirms the accuracy of the calculation and helps clarify a number of issues
related to the $n{}^3\mathrm{H}$ total cross section at the peak of the
resonance region, as well as an $A_y$ deficiency in $p{}^3\mathrm{He}$.
Calculations are fully converged in terms of $NN$ partial waves and involve no
uncontrolled approximations.


title:
An equations-of-motion approach to quantum mechanics: application to a
  model phase transition

abstract:
  We present a generalized equations-of-motion method that efficiently
calculates energy spectra and matrix elements for algebraic models. The method
is applied to a 5-dimensional quartic oscillator that exhibits a quantum phase
transition between vibrational and rotational phases. For certain parameters,
10 by 10 matrices give better results than obtained by diagonalising 1000 by
1000 matrices.


title:
Recent developments in quasi-elastic scattering around the Coulomb
  barrier

abstract:
  We discuss two recent topics on heavy-ion quasi-elastic scattering at
energies around the Coulomb barrier. The first topic is an application of
quasi-elastic scattering at deep-subbarrier energies to extracting the surface
diffuseness parameter of the nucleus-nucleus potential. The second topic is a
coupled-channels analysis for the quasi-elastic barrier distribution for the
$^{70}$Zn + $^{208}$Pb reaction. We show that the coupled-channels calculations
which include the multi-phonon excitations in the colliding nuclei reproduce
reasonably well the experimental excitation function for quasi-elastic
scattering at backward angles and the barrier distribution for this reaction.


title: Hypercentral Constituent Quark Model with a Meson Cloud

abstract:
  The results for the elastic nucleon form factors and the electromagnetic
transition amplitudes to the Delta(1232) resonance, obtained with the
Hypercentral Constituent Quark Model with the inclusion of a meson cloud
correction are briefly presented. The pion cloud effects are explicitly
discussed.


title:
Effects of fluctuations on the initial eccentricity from the Color Glass
  Condensate in heavy ion collisions

abstract:
  We introduce a modified form of the Kharzeev-Levin-Nardi (KLN) approach for
nuclear collisions. The new ansatz for the unintegrated gluon distribution
function preserves factorization, and the saturation scale is bound from below
by that for a single nucleon. It also reproduces the correct scaling with the
number of collisions at high transverse momentum. The corresponding Monte Carlo
implementation allows us to account for fluctuations of the hard sources
(nucleons) in the transverse plane. We compute various definitions of the
eccentricity within the new approach, which are relevant for the interpretation
of the elliptic flow. Our approach predicts breaking of the scaling of the
eccentricity with the Glauber eccentricity at the level of about 30%.


title:
Hadronic parity violation in $\vec{n} p \to d \gamma$ with effective
  field theory

abstract:
  The parity-violating nucleon-nucleon (NN) potential is considered up to
next-to-next-to leading order in heavy-baryon chiral perturbation theory. We
include one-pion exchange at leading order and the two-pion exchange and
two-nucleon contact terms at next-to-next-to-leading order. The effects of
intermediate (two-pion exchange) and short-range (two-nucleon contact) terms
are probed by calculating the photon asymmetry $A_\gamma$ in $\vec{n} p \to d
\gamma$ employing Siegert's theorem and an accurate phenomenological potential
for the parity-conserving NN interaction. We explore in detail the
uncertainties due to the parameters that control the contribution of the
short-range interaction. We obtain about 20% uncertainty in the value of
$A_\gamma$ up to the next-to-next-to leading order. We discuss the implication
of this uncertainty for the determination of the weak pion-nucleon coupling
constant and how the uncertainty can be reduced.


title: Tensor interaction contributions to single-particle energies

abstract:
  We calculate the contribution of the nucleon-nucleon tensor interaction to
single-particle energies with finite-range $ G $ matrix potentials and with
zero-range Skyrme potentials. The Skx Skyrme parameters including the
zero-range tensor terms with strengths calibrated to the finite-range results
are refitted to nuclear properties. The fit allows the zero-range
proton-neutron tensor interaction as calibrated to the finite-range potential
results and that gives the observed change in the single-particle gap
$\epsilon$(h$_{11/2}$)-$\epsilon$(g$_{7/2}$) going from $^{114}$Sn to
$^{132}$Sn. However, the experimental $\ell$ dependence of the spin-orbit
splittings in $^{132}$Sn and $^{208}$Pb is not well described when the tensor
is added, due to a change in the radial dependence of the total spin-orbit
potential. The gap shift and a good fit to the $\ell$-dependence can be
recovered when the like-particle tensor interaction is opposite in sign to that
required for the $ G $ matrix.


title: Radial sensitivity of kaonic atoms and strongly bound $\bar K$ states

abstract:
  The strength of the low energy K^- nucleus real potential has recently
received renewed attention in view of experimental evidence for the possible
existence of strongly bound K^- states. Previous fits to kaonic atom data led
to either 'shallow' or to 'deep' potentials, where only the former are in
agreement with chiral approaches but only the latter can produce strongly bound
states. Here we explore the uncertainties of the K^- nucleus optical
potentials, obtained from fits to kaonic atom data, using the functional
derivatives of the best-fit chi^2 values with respect to the potential. We find
that only the deep type of potential provides information which is applicable
to the K^- interaction in the nuclear interior.


title: Wounded quarks and diquarks in heavy ion collisions

abstract:
  A model in which the soft collisions of the nucleon are described in terms of
interactions of its two constituents (a quark and a diquark) is proposed. When
adjusted to describe precisely the elastic proton-proton scattering data and
supplemented with the idea of wounded constituents, the model accounts rather
well for the centrality dependence of particle production in the central
rapidity region at RHIC energies.


title:
Beyond the relativistic mean-field approximation (II): configuration
  mixing of mean-field wave functions projected on angular momentum and
  particle number

abstract:
  The framework of relativistic self-consistent mean-field models is extended
to include correlations related to the restoration of broken symmetries and to
fluctuations of collective variables. The generator coordinate method is used
to perform configuration mixing of angular-momentum and particle-number
projected relativistic wave functions. The geometry is restricted to axially
symmetric shapes, and the intrinsic wave functions are generated from the
solutions of the relativistic mean-field + Lipkin-Nogami BCS equations, with a
constraint on the mass quadrupole moment. The model employs a relativistic
point-coupling (contact) nucleon-nucleon effective interaction in the
particle-hole channel, and a density-independent $\delta$-interaction in the
pairing channel. Illustrative calculations are performed for $^{24}$Mg,
$^{32}$S and $^{36}$Ar, and compared with results obtained employing the model
developed in the first part of this work, i.e. without particle-number
projection, as well as with the corresponding non-relativistic models based on
Skyrme and Gogny effective interactions.


title:
Statistical hadronization of heavy quarks in ultra-relativistic
  nucleus-nucleus collisions

abstract:
  We present new results on the statistical hadronization of heavy quarks at
SPS, RHIC and LHC energies. Several new aspects are considered, among them a
separation of the collision geometry into a ``core'' and a ``corona'' part and
an estimate of the annihilation rate of charm quark in a hot plasma, together
with a critical assessment of its influence on the results. For RHIC energies
we investigate the centrality dependence of J/psi production focusing on the
model results for different values of the charm production cross section,
including its theoretical and experimental uncertainty. We also study, within
this model, the rapidity dependence of the J/psi yield. Recent RHIC data from
the PHENIX experiment are well reproduced. At LHC energy, we update our model
predictions for the centrality dependence of the J/psi yield and investigate as
well the rapidity dependence. We also discuss the transverse momentum
distributions of J/psi mesons expected from the model and provide predictions
for a range of values of the expansion velocity at chemical freeze-out.
Finally, we extend the model to predict Upsilon yields in Pb+Pb collisions at
LHC energy.


title: Dependence of the BCS 1S0 superfluid pairing gap on nuclear interactions

abstract:
  We study in detail the dependence of the 1S0 superfluid pairing gap on
nuclear interactions and on charge-independence breaking at the BCS level.
Starting from chiral effective-field theory and conventional nucleon-nucleon
(NN) interactions, we use the renormalization group to generate low-momentum
interactions V_{low k} with sharp and smooth regulators. The resulting BCS gaps
are well constrained by the NN scattering phase shifts, and the cutoff
dependence is very weak for sharp or sufficiently narrow smooth regulators with
cutoffs Lambda > 1.6 fm^{-1}. It is therefore likely that the effect of
three-nucleon interactions on 1S0 superfluidity is small at the BCS level. The
charge dependence of nuclear interactions has a 10% effect on the pairing gap.


title:
Effective field theory as the bridge between lattice QCD and nuclear
  physics

abstract:
  A confluence of theoretical and technological developments are beginning to
make possible contributions to nuclear physics from lattice QCD. Effective
field theory plays a critical role in these advances. I give several examples.


title:
Charged-particle rapidity density in Au+Au collisions in a quark
  combination model

abstract:
  Rapidity/seudorapidity densities for charged particles and their centrality,
rapidity and energy dependence in Au+Au collisions at RHIC are studied in a
quark combination model. Using a Gaussian-type rapidity distribution for
constituent quarks as a result of Landau hydrodynamic evolution, the data at
$\sqrt{s_{NN}}=130, 200$ GeV at various centralities in full pseudorapidity
range are well described, and the charged particle multiplicity are reproduced
as functions of the number of participants. The energy dependence of the shape
of the $dN_{ch}/d\eta$ distribution is also described at various collision
energies $\sqrt{s_{NN}}=200, 130, 62.4$ GeV in central collisions with same
value of parameters except 19.6 GeV. The calculated rapidity distributions and
yields for the charged pions and kaons in central Au+Au collisions at
$\sqrt{s_{NN}}=200$ GeV are compared with experimental data of the BRAHMS
Collaboration.


title: Jet-quenching in a 3D hydrodynamic medium

abstract:
  We study the radiative energy loss of hard partons in a soft medium in the
multiple soft scattering approximation. The soft medium is described by a 3D
hydrodynamical model and we treat the averaging over all possible parton paths
through the medium without approximation. While the nuclear suppression factor
$R_{AA}$ does not reflect the high quality of the medium description (except in
a reduced systematic uncertainty in extracting the quenching power of the
medium), the hydrodynamical model also allows to study different centralities
and in particular the angular variation of $R_{AA}$ with respect to the
reaction plane, allowing for a controlled variation of the in-medium
path-length. We study the angular dependence of $R_{AA}$ for different
centralities, discuss the influence of hydrodynamical expansion and flow and
comment on the comparison with preliminary data.


title:
On the electrodisintegration of the deuteron in the Bethe-Salpeter
  formalism

abstract:
  The (ed -> enp) process in the frame of the Bethe-Salpeter approach with a
separable kernel of the Nucleon-Nucleon (NN) interaction was considered. This
conception keeps the covariance of description of the process. Special
attention was devoted to a contribution of the D-states of the deuteron in the
cross section of the electrodisintegration. It was shown that the spectator
particle (neutron) plays an important role. The factorization of a cross
section of this reaction in the impulse approximation was checked by analytical
and numerical calculations.


title: Four-nucleon scattering: Ab initio calculations in momentum space

abstract:
  The four-body equations of Alt, Grassberger and Sandhas are solved for $\nH$
scattering at energies below three-body breakup threshold using various
realistic interactions including one derived from chiral perturbation theory.
  After partial wave decomposition the equations are three-variable integral
equations that are solved numerically without any approximations beyond the
usual discretization of continuum variables on a finite momentum mesh. Large
number of two-, three- and four-nucleon partial waves are considered until the
convergence of the observables is obtained. The total $\nH$ cross section data
in the resonance region is not described by the calculations which confirms
previous findings by other groups. Nevertheless the numbers we get are slightly
higher and closer to the data than previously found and depend on the choice of
the two-nucleon potential. Correlations between the $A_y$ deficiency in $\nd$
elastic scattering and the total $\nH$ cross section are studied.


title: Cold uniform matter and neutron stars in the quark-mesons-coupling model

abstract:
  A new density dependent effective baryon-baryon interaction has been recently
derived from the quark-meson-coupling (QMC) model, offering impressive results
in application to finite nuclei and dense baryon matter. This self-consistent,
relativistic quark-level approach is used to construct the Equation of State
(EoS) and to calculate key properties of high density matter and cold, slowly
rotating neutron stars. The results include predictions for the maximum mass of
neutron star models, together with the corresponding radius and central
density, as well the properties of neutron stars with mass of order 1.4
$M_\odot$. The cooling mechanism allowed by the QMC EoS is explored and the
parameters relevant to slow rotation, namely the moment of inertia and the
period of rotation investigated. The results of the calculation, which are
found to be in good agreement with available observational data, are compared
with the predictions of more traditional EoS. The QMC EoS provides cold neutron
star models with maximum mass 1.9--2.1 M$_\odot$, with central density less
than 6 times nuclear saturation density ($n_{0}= 0.16 {\rm fm}^{-3}$) and
offers a consistent description of the stellar mass up to this density limit.
In contrast with other models, QMC predicts no hyperon contribution at
densities lower than $3n_0$, for matter in $\beta$-equilibrium. At higher
densities, $\Xi^{-,0}$ and $\Lambda$ hyperons are present.


title: Pairing correlations beyond the mean field

abstract:
  We discuss dynamical pairing correlations in the context of configuration
mixing of projected self-consistent mean-field states, and the origin of a
divergence that might appear when such calculations are done using an energy
functional in the spirit of a naive generalized density functional theory.


title: Compton Scattering on He-3

abstract:
  We present first calculations for Compton scattering on $^3$He. The objective
of the calculation is an extraction of the neutron polarizabilities.


title:
Extraction and Interpretation of gamma N --> Delta Form Factors within a
  Dynamical Model

abstract:
  Within the dynamical model of Refs. [Phys. Rev. C54, 2660 (1996); C63, 055201
(2001)], we perform an analysis of recent data of pion electroproduction
reactions at energies near the Delta(1232) resonance. We discuss possible
interpretations of the extracted bare and dressed gamma N --> Delta form
factors in terms of relativistic constituent quark models and Lattice QCD
calculations. Possible future developments are discussed.


title: Study of nucleon resonances with electromagnetic interactions

abstract:
  Recent developments in using electromagnetic meson production reactions to
study the structure of nucleon resonances are reviewed. Possible future works
are discussed.


title: Collective Shape-Phases of Interacting Fermion Systems

abstract:
  A microscopic theory is presented for identifying shape-phase structures and
transitions in interacting fermion systems. The method provides a microscopic
description for collective shape-phases, and reveals detailed dependence of
such shape-phases on microscopic interaction strengths. The theory is generally
applicable to fermion systems such as nuclei, quarks, and in particular trapped
cold atoms, where shape-phases may be observed and investigated in a controlled
manner.


title: eta-photoproduction in the resonance energy region

abstract:
  The $\eta$ production in the nucleon resonance energy region is studied
within the unitary coupled-channels effective Lagrangian approach of the
Giessen model. We demonstrate that the second peak recently observed in the
cross section of $\eta$ photoproduction on the neutron at $\sqrt{s}$=1.66 GeV
can be explained in terms of coupled-channel effects due to $S_{11}(1650)$ and
$P_{11}(1710)$ resonance excitations.


title: Tensor Forces and the Ground-State Structure of Nuclei

abstract:
  Two-nucleon momentum distributions are calculated for the ground states of
nuclei with mass number $A\leq 8$, using variational Monte Carlo wave functions
derived from a realistic Hamiltonian with two- and three-nucleon potentials.
The momentum distribution of $np$ pairs is found to be much larger than that of
$pp$ pairs for values of the relative momentum in the range (300--600) MeV/c
and vanishing total momentum. This order of magnitude difference is seen in all
nuclei considered and has a universal character originating from the tensor
components present in any realistic nucleon-nucleon potential. The correlations
induced by the tensor force strongly influence the structure of $np$ pairs,
which are predominantly in deuteron-like states, while they are ineffective for
$pp$ pairs, which are mostly in $^1$S$_0$ states. These features should be
easily observable in two-nucleon knock-out processes, such as $A(e,e^\prime
np)$ and $A(e,e^\prime pp)$.


title: Few-Body Lattice Calculations

abstract:
  I discuss the recent progress toward computing few-body observables using
numerical lattice techniques. The focus is overwhelmingly on the latest results
from lattice QCD calculations. I present preliminary results from a lattice
calculation of the central and tensor potentials between B-mesons in the
heavy-quark limit.


title: Phase transition and properties of compact star

abstract:
  We investigate the phase transition to a deconfined phase and the
consequences in the formation of neutron stars. We use the recently proposed
effective field theory motivated relativistic mean field theory for hadron and
the MIT Bag model and color-flavor locked (CFL) phase for the quark matter in
order to get the appropriate equation of state. The properties of star are then
calculated. The differences between unpaired and CFL quark matter are
discussed.


title: Liquid-like phases of \pi^+\pi^- matter

abstract:
  To give a common theoretical description of liquid phases of the charged pion
matter in a wide temperature interval, the relativistic quantum $\phi^6$ type
model is considered. The liquid states of pion condensate and hot pion matter
are investigated.


title:
A Monte Carlo approach to study neutron and fragment emission in
  heavy-ion reactions

abstract:
  Quantum Molecular Dynamics models (QMD) are Monte Carlo approaches targeted
at the description of nucleon-ion and ion-ion collisions. We have developed a
QMD code, which has been used for the simulation of the fast stage of ion-ion
collisions, considering a wide range of system masses and system mass
asymmetries. The slow stage of the collisions has been described by statistical
methods. The combination of both stages leads to final distributions of
particles and fragments, which have been compared to experimental data
available in literature. A few results of these comparisons, concerning neutron
double-differential production cross-sections for C, Ne and Ar ions impinging
on C, Cu and Pb targets at 290 - 400 MeV/A bombarding energies and fragment
isotopic distributions from Xe + Al at 790 MeV/A, are shown in this paper.


title:
QCD susceptibilities and nuclear matter saturation in a chiral theory:
  inclusion of pion loops

abstract:
  We derive the equation of state of symmetric nuclear matter in a relativistic
theory with $\sigma$ and $\omega$ exchange. We take a chiral version of this
model which insures all the chiral constraints. Going beyond the mean field
approach we introduce the effects of the pion loops. For the parameters of the
model, in order to fix those linked to pion exchange, we exploit the most
recent information on the short-range part of the spin-isospin interaction. For
those linked to the scalar meson exchange we make use of an analysis of lattice
results on the nucleon mass evolution with the quark mass. With these inputs we
are able reach a correct description of the saturation properties. From the
equation of state of symmetric nuclear matter we alsoderive the density
dependence of the quark condensate and of the QCD susceptibilities.


title: The crust of neutron stars

abstract:
  The structure of the crust of a neutron star is completely determined by the
experimentally measured nuclear masses up to a density of the order of 10^11
g.cm^{-3}. At higher densities, the composition of the crust still remains
uncertain, mainly due to the presence of ``free'' superfluid neutrons which
affect the properties of the nuclear ``clusters''. After briefly reviewing
calculations of the equilibrium structure of the crust, we point out that the
current approach based on the Wigner-Seitz approximation does not properly
describe the unbound neutrons. We have recently abandoned this approximation by
applying the band theory of solids. We have shown that the dynamical properties
of the free neutrons are strongly affected by the clusters by performing 3D
calculations with Bloch boundary conditions.


title:
The pseudo scalar form factor of the nucleon, the sigma-like term, and
  the $L_0^+$ amplitude for charged pion electro-production near threshold

abstract:
  The pseudo scalar form factor, which represents the pseudo scalar quark
density distribution due to finite quark masses on the nucleon, is shown to
manifest itself with the induced pseudo scalar form factor in the $L_0^+$
amplitude for the charged pion electro-production. Both form factors show their
own peculiar momentum dependence. Under the approximation on which the
Goldberg-Treimann relation holds, a sum of both form factors' contributions
accounts for the t-channel contribution in the charged pion electro-production
near threshold.


title: Similarity Renormalization Group for Nucleon-Nucleon Interactions

abstract:
  The similarity renormalization group (SRG) is based on unitary
transformations that suppress off-diagonal matrix elements, forcing the
hamiltonian towards a band-diagonal form. A simple SRG transformation applied
to nucleon-nucleon interactions leads to greatly improved convergence
properties while preserving observables, and provides a method to consistently
evolve many-body potentials and other operators.


title: Superfluidity in neutron stars and cold atoms

abstract:
  We discuss superfluidity in neutron matter, with particular attention to
induced interactions and to universal properties accessible with cold atoms.

categories: nucl-th astro-ph cond-mat.supr-con nucl-ex


title:
Empirical Proton-Neutron Interactions and Nuclear Density Functional
  Theory: Global, Regional and Local Comparisons

abstract:
  Calculations of nuclear masses, using nuclear density functional theory, are
presented for even-even nuclei spanning the nuclear chart. The resulting
binding energy differences can be interpreted in terms of valence
proton-neutron interactions. These are compared globally, regionally, and
locally with empirical values. Overall, excellent agreement is obtained.
Discrepancies highlight neglected degrees of freedom and can point to improved
density functionals.


title: Meson Systems with Ginsparg-Wilson Valence Quarks

abstract:
  Unphysical effects associated with finite lattice spacing and partial
quenching generally lead to to the presence of unphysical terms in chiral
extrapolation formulae, which must be removed to make physical predictions. We
use mixed action effective field theory to discuss that through next-to-leading
order, simulations of meson systems which employ valence quarks satisfying the
Ginsparg-Wilson relation (lattice-chiral symmetry), depend only upon the
physical counterterms of interest, provided one uses a lattice-physical
(on-shell) renormalization scheme. With this lattice-physical renormalization,
the I = 2 pi-pi, I = 3/2 K-pi, I=1 K-K meson scattering lengths combined with
f_K / f_pi share only two linearly independent counterterms, both of which are
physical. This allows us to make use of existing lattice QCD simulations to
make a prediction of the I = 1 K-K scattering length.


title: Unbound exotic nuclei studied by projectile fragmentation

abstract:
  We present a simple time dependent model for the excitation of a nucleon from
a bound state to a continuum resonant state in a neutron-core complex potential
which acts as a final state interaction.
  The final state is described by an optical model S-matrix so that both
resonant and non resonant states of any continuum energy can be studied as well
as deeply bound initial states. It is shown that, due to the coupling between
the initial and final states, the neutron-core free particle phase shifts are
modified, in the exit channel, by an additional phase. The effect of the
additional phase on the breakup spectra is clarified. As an example the
population of the low energy resonances of $^{11}$Be and of the unbound
$^{13}$Be is discussed. Finally, we suggest that the excitation energy spectra
of an unbound nucleus might reflect the structure of the parent nucleus from
whose fragmentation they are obtained.


title: Nucleon electromagnetic form factors

abstract:
  Elastic electromagnetic nucleon form factors have long provided vital
information about the structure and composition of these most basic elements of
nuclear physics. The form factors are a measurable and physical manifestation
of the nature of the nucleons' constituents and the dynamics that binds them
together. Accurate form factor data obtained in recent years using modern
experimental facilities has spurred a significant reevaluation of the nucleon
and pictures of its structure; e.g., the role of quark orbital angular
momentum, the scale at which perturbative QCD effects should become evident,
the strangeness content, and meson-cloud effects. We provide a succinct survey
of the experimental studies and theoretical interpretation of nucleon
electromagnetic form factors.


title: Large two-pion-exchange contributions to the $pp\to pp\pi^0$ reaction

abstract:
  The large two-pion exchange amplitudes are calculated in HB$\chi$PT and their
net contribution to the reaction cross section is large.


title: Renormalization group analysis of nuclear current operators

abstract:
  We review our study of the Wilsonian renormalization group (WRG) analysis for
nuclear current operators. We apply WRG method to axial-current operators
derived from various approaches and obtain the unique effective low-energy
operator.


title:
Model Independent Considerations on Two-Photon Exchange in Electron
  Proton Scattering and in the Crossed Processes

abstract:
  The presence of two photon exchange in $ep$ elastic scattering and in the
crossed processes ($\bar p +p\leftrightarrow \ell^+ +\ell^-$, $\ell=e$ or
$\mu$) is discussed in terms of three complex amplitudes which are functions of
two kinematical variables, the momentum transfer squared $q^2$ and the
polarization of the virtual photon, $\epsilon$. Model independent expressions
of the differential cross section and of polarization observables are derived.
Particular attention is devoted to the extraction of hadron electromagnetic
form factors which becomes much more difficult in presence of two photon
exchange, and to the relevant experimental observables which could give
evidence for such mechanism.


title:
Strange quark effects in electron and neutrino-nucleus quasi-elastic
  scattering

abstract:
  The role of the sea quarks to ground state nucleon properties with
electroweak probes is discussed. A relativistic Green's function approach to
parity violating electron scattering and a distorted-wave impulse-approximation
applied to charged- and neutral-current neutrino-nucleus quasi-elastic
scattering are presented in view of the possible determination of the
strangeness content of the nucleon.


title: Overview of Non-Relativistic QCD

abstract:
  An overview of recent theoretical progress on Non-Relativistic QCD and
related effective theories is provided.


title: Isospin dependent thermodynamics of fragmentation

abstract:
  The thermal and phase properties of a multifragmentation model which uses
clusters as degrees of freedom, are explored as a function of isospin. A good
qualitative agreement is found with the phase diagram of asymmetric nuclear
matter as established by different mean-field models. In particular, from the
convexity properties of the nuclear entropy, we show that uncharged finite
nuclei display first and second order liquid-gas-like phase transitions.
Different quantities are examined to connect the thermal properties of the
system to cluster observables. In particular we show that fractionation is only
a loose indication of phase coexistence. A simple analytical formula is
proposed and tested to evaluate the symmetry (free) energy from the widths of
isotopic distributions. Assuming that one may restore the isotopic composition
of break-up fragments, it is found that some selected isotopic observables can
allow to quantitatively access the freeze-out symmetry energy in
multifragmentation experiments.


title: Hadron Physics and the Dyson--Schwinger Equations of QCD

abstract:
  We use the Bethe-Salpeter equation in rainbow-ladder truncation to calculate
the ground state mesons from the chiral limit to bottomonium, with an effective
interaction that was previously fitted to the chiral condensate and pion decay
constant. Our results are in reasonable agreement with the data, as are the
vector and pseudoscalar decay constants. The meson mass differences tend to
become constant in the heavy-quark limit. We also present calculations for the
pion and rho electromagnetic form factors, and for the single-quark form
factors of the \eta_c and J/\psi.


title:
Matter induced charge symmetry breaking and pion form factor in nuclear
  medium

abstract:
  Medium modification of pion form factor has been evaluated in asymmetric
nuclear matter. It is shown that both the shape and the pole position of the
pion form factor in dense asymmetric nuclear matter is different from its
vacuum counterpart with $\rho$-$\omega$ mixing. This is due to the density and
asymmetry dependent $\rho$-$\omega$ mixing which could even dominate over its
vacuum counterpart in matter. Effect of the in-medium pion factor on
experimental observables {\it e.g.}, invariant mass distribution of lepton
pairs has been demonstrated.


title: Wobbling excitations in 156Dy and 162Yb

abstract:
  We study in the cranked Nilsson plus random phase approximation low-lying
quadrupole excitations of positive parity and negative signature in 156Dy and
162Yb at high spins. Special attention is paid to a consistent description of
wobbling excitations and their identification among excited states. A good
agreement between available experimental data and the results of calculations
is obtained. We found that in 156Dy the lowest odd spin gamma-vibrational
states transform to the wobbling excitations after the backbending, associated
with the transition from axially-symmetric to nonaxial shapes. Similar results
are predicted for 162Yb. The analysis of electromagnetic transitions, related
to the wobbling excitations, determines uniquely the sign of the
gamma-deformation in 156Dy and 162Yb after the transition point.


title: Shell-model calculations with modern nucleon-nucleon potentials

abstract:
  We report on a study of neutron-rich even-mass Te isotopes in terms of the
shell model employing a realistic effective interaction derived from the
CD-Bonn nucleon-nucleon potential. The strong short-range repulsion of the
latter is renormalized by constructing a smooth low-momentum potential,
V-low-k, that is used directly as input for the calculation of the effective
interaction. In this paper, after a brief review of the theoretical framework,
we present our results. Comparison shows that they are in very good agreement
with the available experimental data.