title: The High-Density Symmetry Energy and Direct Urca

abstract:
  The symmetry energy of nucleonic matter is usually assumed to be quadratic in
the isospin density. While this may be justified at sub-saturation densities,
there is no need to enforce this restriction at super-saturation densities. The
presence of a quartic term can strongly modify the critical density for the
direct Urca process which leads to faster cooling of neutron stars. Neutron
star cooling predictions which lie below the observational data can, for some
equations of state, be repaired with a quartic term which effectively turns off
the direct Urca process.


title: No-core shell model for 48-Ca, 48-Sc and 48-Ti

abstract:
  We report the first no-core shell model results for $^{48}Ca$, $^{48}Sc$ and
$^{48}Ti$ with derived and modified two-body Hamiltonians. We use an oscillator
basis with a limited $\hbar\Omega$ range around $45/A^{1/3}-25/A^{2/3} = 10.5
MeV$ and a limited model space up to $1\hbar\Omega$. No single-particle
energies are used. We find that the charge dependence of the bulk binding
energy of eight A=48 nuclei is reasonably described with an effective
Hamiltonian derived from the CD-Bonn interaction while there is an overall
underbinding by about 0.4 MeV/nucleon. However, the resulting spectra exhibit
deficiencies that are anticipated due to: (1) basis space limitations and/or
the absence of effective many-body interactions; and, (2) the absence of
genuine three-nucleon interactions. We then introduce additive
isospin-dependent central terms plus a tensor force to our Hamiltonian and
achieve accurate binding energies and reasonable spectra for all three nuclei.
The resulting no-core shell model opens a path for applications to the
double-beta ($\beta\beta$) decay process.


title: Mean Field Theoretical Structure of He and Be Isotopes

abstract:
  The structures of He and Be even-even isotopes are investigated using an
axially symmetric Hartree-Fock approach with a Skyrme-IIIls mean field
potential. In these simple HF calculations, He and Be isotopes appear to be
prolate in their ground states and Be isotopes have oblate shape isomeric
states. It is also shown that there exists a level crossing when the nuclear
shape changes from the prolate state to the oblate state. The single neutron
levels of Be isotopes exhibit a neutron magic number 6 instead of 8 and show
that the level inversion between 1/2- and 1/2+ levels occurs only for a largely
deformed isotope. Protons are bound stronger in the isotope with more neutrons
while neutron levels are somewhat insensitive to the number of neutrons and
thus the nuclear size and also the neutron skin become larger as the neutron
number increases. In these simple calculations with Skyrme-IIIls interaction no
system with a clear indication of neutron halo was found among He and Be
isotopes. Instead of it we have found 8He+2n, 2n+8He+2n, and 16Be+2n like chain
structures with clusters of two correlated neutrons. It is also shown that 8He
and 14Be in their ground states are below the neutron drip line in which all
nucleons are bound with negative energy and that 16Be in its ground state is
beyond the neutron drip line with two neutrons in positive energy levels.


title:
Consistency of particle-particle random-phase approximation and its
  renormalizations

abstract:
  The consistency condition is tested within the particle-particle random-phase
approximation (RPA), renormalized RPA (RRPA) and the self-consistent RPA
(SCRPA) making use of the Richardson model of pairing. The two-particle
separation energy is calculated in two ways, namely as the energy of the first
addition mode, which adds two particles to a core with N particles, and as the
energy of the first removal mode, which removes two particles from the (N+2) -
particle system to get back to the same N-particle core. The corresponding
transitions generated by the pairing operators are also calculated. It is found
that the results obtained in these two ways of calculations are close to each
other only at large values of particle number N and/or small interaction
strength. At N below 10 for a given value of the interaction strength, the
discrepancy between the results obtained in two ways of calculations within the
SCRPA is much smaller than those given by the RPA and RRPA.


title: Giant resonances under extreme conditions

abstract:
  The theoretical description of nuclear resonances at zero and finite
temperatures is presented. The following issues are addressed:
  1) Giant dipole resonances (GDR) in highly excited nuclei, including both low
and high regions of temperature. The results of calculations are obtained
within the phonon-damping model, thermal shape-fluctuation model including
thermal pairing, and compared with experimental data.
  2) The electromagnetic cross sections of the double GDRs (DGDR) in Xe-136 and
Pb-208. The results obtained in theoretical calculations are compared with the
experimental data for the DGDR cross sections in exclusive measurements at
near-relativistic energies.
  3) GDR and pygmy dipole resonances (PDR) in neutron-rich nuclei, where the
effect of coupling of the GDR to complicated configurations on the PDR is
analyzed.


title:
Study of the effect of the tensor correlation in oxygen isotopes with
  the charge- and parity-projected Hartree-Fock method

abstract:
  Recently, we developed a mean-field-type framework which treats the
correlation induced by the tensor force. To exploit the tensor correlation we
introduce single-particle states with the parity and charge mixing. To make a
total wave function have a definite charge number and a good parity, the charge
number and parity projections are performed. Taking a variation of the
projected wave function with respect to single-particle states a
Hartree-Fock-like equation, the charge- and parity-projected Hartree-Fock
equation, is obtained. In the charge- and parity-projected Hartree-Fock method,
we solve the equation selfconsistently. In this paper we extend the charge- and
parity-projected Hartree-Fock method to include a three-body force, which is
important to reproduce the saturation property of nuclei in mean-field
frameworks. We apply the charge- and parity-projected Hartree-Fock method to
sub-closed-shell oxygen isotopes (14O, 16O, 22O, 24O, and 28O) to study the
effect of the tenor correlation and its dependence on neutron numbers. We
obtain reasonable binding energies and matter radii for these nuclei. It is
found that relatively large energy gains come from the tensor force in these
isotopes and there is the blocking effect by occupied neutron orbits on the
tensor correlation.


title:
A chiral symmetric relativistic mean field model with logarithmic sigma
  potential

abstract:
  We develop a chiral symmetric relativistic mean field model with logarithmic
sigma potential derived in the strong coupling limit of the lattice QCD. We
find that both of the nuclear matter and finite nuclei are well described in
the present model. The normal vacuum is found to have global stability at zero
and finite baryon densities, and an equation of state with moderate stiffness
(K ~ 280 MeV) is obtained. The binding energies and charge radii of Z closed
even-even nuclei are well reproduced in a wide mass range from C to Pb
isotopes, except for the underestimates of binding energies in several jj
closed nuclei.


title: Jet conversions in a quark-gluon plasma

abstract:
  Quark and gluon jets traversing through a quark-gluon plasma not only lose
their energies but also can undergo flavor conversions. The conversion rates
via the elastic $q(\bar q)g\to gq(\bar q)$ and the inelastic $q\bar
q\leftrightarrow gg$ scatterings are evaluated in the lowest order in QCD.
Including both jet energy loss and conversions in the expanding quark-gluon
plasma produced in relativistic heavy ion collisions, we have found a net
conversion of quark to gluon jets. This reduces the difference between the
nuclear modification factors for quark and gluon jets in central heavy ion
collisions and thus enhances the $p/\pi^+$ and ${\bar p}/\pi^-$ ratios at high
transverse momentum. However, a much larger net quark to gluon jet conversion
rate than the one given by the lowest-order QCD is needed to account for the
observed similar ratios in central Au+Au and p+p collisions at same energy.
Implications of our results are discussed.


title:
Connecting the X(5)-$\beta^2$, X(5)-$\beta^4$, and X(3) models to the
  shape/phase transition region of the interacting boson model

abstract:
  The parameter independent (up to overall scale factors) predictions of the
X(5)-$\beta^2$, X(5)-$\beta^4$, and X(3) models, which are variants of the X(5)
critical point symmetry developed within the framework of the geometric
collective model, are compared to two-parameter calculations in the framework
of the interacting boson approximation (IBA) model. The results show that these
geometric models coincide with IBA parameters consistent with the phase/shape
transition region of the IBA for boson numbers of physical interest (close to
10). Nuclei within the rare-earth region and select Os and Pt isotopes are
identified as good examples of X(3), X(5)-$\beta^2$, and X(5)-$\beta^4$
behavior.


title: Overview of pion-nucleus interaction at low energies

abstract:
  Predictions of the existence of well-defined deeply bound pionic atom states
for heavy nuclei and the eventual observation of such states by the (d,3He)
reaction have revived interest in the pion-nucleus interaction at threshold and
in its relation to the corresponding pion-nucleon interaction. Explanation of
the 'anomalous' s-wave repulsion in terms of partial restoration of chiral
symmetry and/or in terms of energy-dependence effects have been tested in
global fits to pionic atom data and in a recent dedicated elastic scattering
experiment. The role of neutron density distributions in this context is
discussed in detail for the first time.


title:
Isospin dependent kaon and antikaon optical potentials in dense hadronic
  matter

abstract:
  Isospin effects on the optical potentials of kaons and antikaons in dense
hadronic matter are investigated using a chiral SU(3) model. These effects are
important for asymmetric heavy ion collision experiments. In the present work
the dispersion relations are derived for kaons and antikaons, compatible with
the low energy scattering data, within our model approach. The relations result
from the kaonic interactions with the nucleons, vector mesons and scalar mesons
in the asymmetric nuclear matter. The isospin asymmetry effects arising from
the interactions with the vector-isovector $\rho$- meson as well as the scalar
isovector $\delta$ mesons are considered. The density dependence of the isospin
asymmetry is seen to be appreciable for the kaon and antikaon optical
potentials. This can be particularly relevant for the future accelerator
facility FAIR at GSI, where experiments using neutron rich beams are planned to
be used in the study of compressed baryonic matter.


title:
Recent developments in chiral dynamics of hadrons and hadrons in a
  nuclear medium

abstract:
  In this talk I present recent developments in chiral dynamics of hadrons and
hadrons in a medium addressing the following points: interaction of the octet
of pseudoscalar mesons with the octet of baryons of the nucleon, showing recent
experimental evidence on the existence of two $\Lambda(1405)$ states, the
interaction of the octet of pseudoscalar mesons with the decuplet of baryons of
the $\Delta$, with particular emphasis on the $\Lambda(1520)$ resonance,
dynamically generated by this interaction. Then I review the interaction of
kaons in a nuclear medium and briefly discuss the situation around the claims
of deeply bound states in nuclei. The large renormalization of the
$\Lambda(1520)$ in the nuclear medium is shown as another example of successful
application of the chiral unitary techniques.


title: Solution of the Bohr hamiltonian for soft triaxial nuclei

abstract:
  The Bohr-Mottelson model is solved for a generic soft triaxial nucleus,
separating the Bohr hamiltonian exactly and using a number of different
model-potentials: a displaced harmonic oscillator in $\gamma$, which is solved
with an approximated algebraic technique, and Coulomb/Kratzer,
harmonic/Davidson and infinite square well potentials in $\beta$, which are
solved exactly. In each case we derive analytic expressions for the
eigenenergies which are then used to calculate energy spectra.
  Here we study the chain of osmium isotopes and we compare our results with
experimental information and previous calculations.


title: The relativistic self-energy in nuclear dynamics

abstract:
  It is a well known fact that Dirac phenomenology of nuclear forces predicts
the existence of large scalar and vector mean fields in matter. To analyse the
relativistic self-energy in a model independent way, modern high precision
nucleon-nucleon ($NN$) potentials are mapped on a relativistic operator basis
using projection techniques. This allows to compare the various potentials at
the level of covariant amplitudes were a remarkable agreement is found. It
allows further to calculate the relativistic self-energy in nuclear matter in
Hartree-Fock approximation. Independent of the choice of the nucleon-nucleon
interaction large scalar and vector mean fields of several hundred MeV
magnitude are generated at tree level. In the framework of chiral EFT these
fields are dominantly generated by contact terms which occur at next-to-leading
order in the chiral expansion. Consistent with Dirac phenomenology the
corresponding low energy constants which generate the large fields are closely
connected to the spin-orbit interaction in $NN$ scattering. The connection to
QCD sum rules is discussed as well.


title: Theta+ formation in inclusive gamma D -> pK- X

abstract:
  We analyze the possibility to produce an intermediate Theta^+ via a
KN->\Theta+ formation process in gamma D-> pK^- X (X=nK^+,pK^0) reactions at
some specific kinematical conditions, in which a pK^- pair is knocked out in
the forward direction and its invariant mass is close to the mass of
Lambda(1520). The \Theta^+ signal may appear in the [\gamma D,pK^-] missing
mass distribution. The ratio of the signal (cross section at the \Theta^+ peak
position) to the smooth background processes varies from 0.7 to 2.5 depending
on the spin and parity of Theta+, and it decreases correspondingly if the pK^-
invariant mass is outside of the Lambda(1520)-resonance region. We analyze the
recent CLAS search for the Theta+ in the gamma D ->pK^-nK^+ reaction and show
that the conditions of this experiment greatly reduce the Theta+ formation
process making it difficult to extract a Theta+ peak from the data.


title: Structure of protoneutron stars within a static approach

abstract:
  To investigate the stability of the protoneutron stars in their early
evolution, the minimum gravitational mass plays a fundamental role. This
quantity depends upon the temperature profile assumed. We study within a static
approach the stability of a protoneutron star. In particular we focus on a
suitable temperature profile suggested by dynamical calculations. We consider a
protoneutron star as composed of an isothermal core and an isentropic outer
part. To describe physical properties of the interior we employ a
microscopically derived equation of state for nuclear matter. For the outer
part we employ the Lattimer-Swesty equation of state. The global structure is
studied. The assumed temperature profile turns out to give a range of stability
which supports temperature values in line with those coming from dynamical
calculations. The maximum mass instead depends only upon the equation of state
employed.


title: SQM 2006: Theory Summary and Perspectives

abstract:
  In this write-up of my SQM 2006 Theory Summary talk I focus on a selection of
key contributions which I consider to have a large impact on the current status
of the field of strangeness physics or which may have the potential to
significantly advance strangeness -- or in general flavor physics -- in the
near future.


title: Neutrino propagation in dense hadronic matter

abstract:
  Neutrino propagation in protoneutron stars requires the knowledge of the
composition as well as the dynamical response function of dense hadronic
matter. Matter at very high densities is probably composed of other particles
than nucleons and little is known on the Fermi liquid properties of hadronic
multicomponent systems. We will discuss the effects that the presence of
$\Lambda$ hyperons might have on the response and, in particular, on its
influence on the thermodynamical stability of the system and the mean free path
of neutrinos in dense matter.


title: Flavor content of nucleon form factors in a VMD approach

abstract:
  The strange form factors of the nucleon are studied in a two-component model
consisting of a three-quark intrinsic structure surrounded by a meson cloud. A
comparison with the available experimental world data from the SAMPLE, PVA4,
HAPPEX and G0 collaborations shows a good overall agreement. It is shown that
the strangeness contribution to the electric and magnetic form factors is of
the order of a few percent. In particular, the strange quark contribution to
the charge radius is small (0.005 fm**2) and to the magnetic moment it is
positive (0.315 n.m.).


title: Tensor correlation in 4He with the tensor-optimized shell model

abstract:
  We study the characteristics of the tensor correlation in $^4$He using a
shell model type method. We treat the tensor force explicitly by performing a
configuration-mixing calculation in the $2p2h$ basis and include
single-particle states up to intermediately high angular momenta. We adopt the
Gaussian expansion method for the quantitative description of the spatial
shrinkage of the single-particle states to optimize the tensor correlation. We
are able to describe the full strength of the tensor correlation for $^4$He in
the shell model type method by realizing convergence. We call this model the
tensor-optimized shell model. It is found that in $^4$He, three specific $2p2h$
configurations are strongly coupled with the $(0s)^4$ configuration due to the
characteristic features of the tensor operator.


title:
alpha decay half-lives of new superheavy nuclei within a generalized
  liquid drop model

abstract:
  The alpha decay half-lives of the recently produced isotopes of the 112, 114,
116 and 118 nuclei and decay products have been calculated in the
quasi-molecular shape path using the experimental Qalpha value and a
Generalized Liquid Drop Model including the proximity effects between nucleons
in the neck or the gap between the nascent fragments. Reasonable estimates are
obtained for the observed alpha decay half-lives. The results are compared with
calculations using the Density-Dependent M3Y effective interaction and the
Viola-Seaborg-Sobiczewski formulae. Generalized Liquid Drop Model predictions
are provided for the alpha decay half-lives of other superheavy nuclei using
the Finite Range Droplet Model Qalpha and compared with the values derived from
the VSS formulae.


title:
The spectral function of the omega meson in nuclear matter from a
  coupled-channel resonance model

abstract:
  We calculate the spectral function of the omega meson in nuclear matter at
zero temperature by means of the low-density theorem. The omega N forward
scattering amplitude is calculated within a unitary coupled-channel effective
Lagrangian model that has been applied successfully to the combined analysis of
pion- and photon-induced reactions. While the peak of the omega spectral
distribution is shifted only slightly, we find a considerable broadening of the
omega meson due to resonance-hole excitations. For omega mesons at rest with
respect to the surrounding nuclear medium, we find an additional width of about
60 MeV at saturation density.


title:
Spin projection in the shell model Monte Carlo method and the spin
  distribution of nuclear level densities

abstract:
  We introduce spin projection methods in the shell model Monte Carlo approach
and apply them to calculate the spin distribution of level densities for
iron-region nuclei using the complete $(pf+g_{9/2})$-shell. We compare the
calculated distributions with the spin-cutoff model and extract an
energy-dependent moment of inertia. For even-even nuclei and at low excitation
energies, we observe a significant suppression of the moment of inertia and
odd-even staggering in the spin dependence of level densities.


title:
Magicity and occurrence of band with enhanced B(E2) in neutron-rich
  nuclei 68Ni and 90Zr

abstract:
  Experimental energy spectrum and B(E2) values in 68Ni and 90Zr indicate a
double-magic character in these neutron-rich nuclei with N or Z=40. The data
nevertheless do not show any pronounced irregularity in two-nucleon separation
energy. To understand the underlying physics, we carry out both shell-model and
mean-field calculations. The shell-model calculation can well reproduce all the
observations. It is understood from the mean-field results for 68Ni that the
shell gap at N=40 disappears due to dynamical correlations of the isovector J=0
pairing interaction. In 90Zr, however, such a dynamic process with the J=0
pairing appears not important because of the strong contribution of the J>0
interaction. We study also level schemes in the Ni isotopes and N=50 isotones.
We predict a new band built on the $0_{2}^{+}$ state in both 68Ni and 90Zr. The
states of this band are dominated by two-particle-two-hole excitations from the
fp-shell to the intruder g_{9/2} orbit.


title:
Solvable models for the gamma deformation having X(5) as limiting
  symmetry. Removing some drawbacks of the existent descriptions

abstract:
  Two solvable Hamiltonians for describing the dynamic gamma deformation, are
proposed. The limiting case of each of them is the X(5) Hamiltonian. Analytical
solutions for both energies and wave functions, which are periodic in $\gamma$,
are presented in terms of spheroidal and Mathieu functions, respectively.
Moreover, the gamma depending factors of the transition operator can be
treated.


title:
Isovector splitting of nucleon effective masses, ab-initio benchmarks
  and extended stability criteria for Skyrme energy functionals

abstract:
  We study the effect of the splitting of neutron and proton effective masses
with isospin asymmetry on the properties of the Skyrme energy density
functional. We discuss the ability of the latter to predict observable of
infinite matter and finite nuclei, paying particular attention to controlling
the agreement with ab-initio predictions of the spin-isospin content of the
nuclear equation of state, as well as diagnosing the onset of finite size
instabilities, which we find to be of critical importance. We show that these
various constraints cannot be simultaneously fulfilled by the standard Skyrme
force, calling at least for an extension of its P-wave part.


title: Quantum Collective QCD String Dynamics

abstract:
  The string breaking model of particle production is extended in order to help
explain the transverse momentum distribution in elementary collisions. Inspired
by an idea of Bialas', we treat the string using a collective coordinate
approach. This leads to a chromo-electric field strength which fluctuates, and
in turn implies that quarks are produced according to a thermal distribution.


title: On the scattering length of the K^- d system

abstract:
  Multiple-scattering approximations to Faddeev calculations of the K^- d
scattering length are reviewed and compared with published Kbar-N-N <--> pi-Y-N
fully reactive Faddeev calculations. A new multiple-scattering approximation
which goes beyond the `fixed-center' assumption for the nucleons is proposed,
aiming at accuracies of 5-10%. A precise value of the K^- d scattering length
from the measurement of the K^- d 1s atomic level shift and width, planned by
the DEAR/SIDDHARTA collaboration, plus a precise value for the K^- p scattering
length by improving the K^- p atom measurements, are essential for extracting
the K^- n scattering length, for resolving persistent puzzles in low-energy
Kbar-N phenomenology and for extrapolating into Kbar-nuclear systems.


title:
Scalar Lambda N and Lambda Lambda interaction in a chiral unitary
  approach

abstract:
  We study the central part of Lambda N and Lambda Lambda potential by
considering the correlated and uncorrelated two-meson exchange besides the
omega exchange contribution. The correlated two-meson is evaluated in a chiral
unitary approach. We find that a short range repulsion is generated by the
correlated two-meson potential which also produces an attraction in the
intermediate distance region. The uncorrelated two-meson exchange produces a
sizeable attraction in all cases which is counterbalanced by omega exchange
contribution.


title:
Neutrino Induced Charged Current 1$\pi^+$ Production At Intermediate
  Energies

abstract:
  The charged current one pion production induced by $\nu_\mu$ from nucleons
and nuclei like $^{12}$C and $^{16}$O nuclei has been studied. The calculations
have been done for the incoherent and the coherent processes from nuclear
targets assuming the $\Delta$ dominance model and take into account the effect
of Pauli blocking, Fermi motion of the nucleon and renormalization of $\Delta$
properties in a nuclear medium. The effect of final state interactions of pions
has been taken into account. The theoretical uncertainty in the total cross
sections due to various parameterizations of the weak transition form factors
used in literature has been studied. The numerical results for the total cross
sections are compared with the recent preliminary results from the MiniBooNE
collaboration on $^{12}$C and could be useful in analyzing future data from the
K2K collaboration.


title:
Transverse-Mass Effective Temperature in Heavy-Ion Collisions from AGS
  to SPS

abstract:
  Transverse-mass spectra in Au+Au and Pb+Pb collisions in incident energy
range from 2A to 160A GeV are analyzed within the model of 3-fluid dynamics. It
is shown that dynamical description of freeze-out, accepted in this model,
naturally explains the incident energy behavior of inverse-slope parameters of
these spectra observed in experiment. Simultaneous reproduction of the
inverse-slopes of all considered particles (protons, pions and kaons) suggests
that these particles belong to the same hydrodynamic flow at the instant of
their freeze-out.


title:
Shape coexistence in neutron-deficient Kr isotopes: Constraints on the
  single-particle spectrum of self-consistent mean-field models from collective
  excitations

abstract:
  We discuss shape coexistence in the neutron-deficient Kr72-Kr78 isotopes in
the framework of configuration mixing calculations of particle-number and
angular-momentum projected axial mean-field states obtained from
self-consistent calculations with the Skyrme interaction SLy6 and a
density-dependent pairing interaction. While our calculation reproduces
qualitatively and quantitatively many of the global features of these nuclei,
such as coexistence of prolate and oblate shapes, their strong mixing at low
angular momentum, and the deformation of collective bands, the ordering of our
calculated low-lying levels is at variance with experiment. We analyse the role
of the single-particle spectrum of the underlying mean-field for the spectrum
of collective excitations.


title: Kinematic Rotations of N-particle Hyperspherical Basis

abstract:
  The kinematical rotations of N-partical Hyperspherical basis are considered.
The recurrence relation method of determination of transformation coefficients
for arbitrary N-values is demonstrated.


title: Breaking of nucleon Cooper pairs at finite temperature in 93-98Mo

abstract:
  The S shape of the canonical heat capacity is known as a signature of the
pairing transition and along an isotopic chain it is significantly more
pronounced for nuclei with an even number of neutrons than with an odd number.
Although the heat capacities extracted from experimental level densities in
93-98Mo exhibit a clear S shape, they do not show such an odd-even staggering.
To understand the underlying physics, we analyze thermal quantities evaluated
from the partition function calculated using the static-path plus random-phase
approximation (SPA+RPA) in a monopole pairing model with number-parity
projection. The calculated level densities reproduce very well the experimental
data and they also agree with estimates using the back-shifted Fermi-gas model.
We clarify the reason why the heat capacities for Mo isotopes do not show
odd-even staggering of the S shape. We also discuss thermal odd-even mass
differences in 94-97Mo using the three-, four-, and five-point formula. These
thermal mass differences are regarded as indicators of pairing correlations at
finite temperature.


title:
Isospin Dependence of 1S0 Proton and Neutron Superfluidity in Asymmetric
  Nuclear Matter

abstract:
  We investigate the $^1S_0$ neutron and proton superfluidity in isospin
asymmetric nuclear matter. We have concentrated on the isospin dependence of
the pairing gaps and the effect of a microscopic three-body force. It is found
that as the isospin asymmetry goes higher, the neutron $^1S_0$ superfluid phase
shrinks gradually to a smaller density domain, while the proton one extends
rapidly to a much wider density domain. The three-body force turns out to
weaken the neutron $^1S_0$ superfluidity slightly, but it suppresses strongly
the proton $^1S_0$ superfluidity at high densities in nuclear matter with large
isospin asymmetry.


title: On the convergence of multi-channel effective interactions

abstract:
  A detailed analysis of convergence properties of the Andreozzi-Lee-Suzuki
iteration method, which is used for the calculation of low-momentum effective
potentials Vlowk is presented. After summarizing different modifications of the
iteration method for one-flavor channel we introduce a simple model in order to
study the generalization of the iteration method to multi-flavor channels. The
failure of a straightforward generalization is discussed. The introduction of a
channel-dependent cutoff cures the conceptual and technical problems. This
novel method has already been applied successfully for realistic
hyperon-nucleon interactions.


title:
Screening Effects in Superfluid Nuclear and Neutron Matter within
  Brueckner Theory

abstract:
  Effects of medium polarization are studied for $^1S_0$ pairing in neutron and
nuclear matter. The screening potential is calculated in the RPA limit,
suitably renormalized to cure the low density mechanical instability of nuclear
matter. The selfenergy corrections are consistently included resulting in a
strong depletion of the Fermi surface. All medium effects are calculated based
on the Brueckner theory. The $^1S_0$ gap is determined from the generalized gap
equation. The selfenergy corrections always lead to a quenching of the gap,
which is enhanced by the screening effect of the pairing potential in neutron
matter, whereas it is almost completely compensated by the antiscreening effect
in nuclear matter.


title:
Impact parameter dependence of heavy ion e+ e- pair production to all
  orders in Z alpha

abstract:
  The heavy ion probability for continuum e+ e- pair production has been
calculated to all orders in Z alpha as a function of impact parameter. The
formula resulting from an exact solution of the semiclassical Dirac equation in
the ultrarelativistic limit is evaluated numerically. In a calculation of gamma
= 100 colliding Au ions the probability of e+ e- pair production is reduced
from the perturbation theory result throughout the impact parameter range.


title: Excited-State Density Distributions of Neutron-Rich Unstable Nuclei

abstract:
  We calculate densities of excited states in the quasiparticle random-phase
approximation (QRPA)with Skyrme interactions and volume pairing. We focus on
low-energy peaks/bumps in the strength functions of a range of Ca, Ni, and Sn
isotopes for J pi = 0+, 1-, and 2+. We define an "emitted-neutron number",
which we then use to distinguish localized states from scattering-like states.
The degree of delocalization either increases as the neutron-drip line is
approached or stays high between the stability line and the drip line. In the
2+ channel of Sn, however, the low-lying states, not even counting surface
vibrations, are still fairly well localized on average, even at the neutron
drip line.


title: Spin ordered phase transitions in isospin asymmetric nuclear matter

abstract:
  The possibility of appearance of spin polarized states in nuclear matter is
studied within the framework of a Fermi liquid theory with Skyrme effective
forces in a wide range of isospin asymmetries and densities. There are a few
possible scenarios of spin ordered phase transitions: (a) nuclear matter with
SLy4 interaction undergoes at some critical density a phase transition to a
spin polarized state with the oppositely directed spins of neutrons and
protons; (b) in nuclear matter with SkI5 interaction a spin polarized state
with the like-directed neutron and proton spins is formed; (c) nuclear matter
with SkI3 interaction under increasing density, at first, undergoes a phase
transition to the state with the opposite directions of neutron and proton
spins, which goes over at larger density to the state with the same direction
of nucleon spins. Spin polarized states at strong excess neutrons over protons
are accompanied by the long tails in the density profiles of the neutron spin
polarization parameter near the critical density, if the energy gain of the
transition from the nonpolarized state to the polarized one is the decreasing
function of isospin asymmetry (SLy4 force). In the opposite case, if the energy
gain is increased with isospin asymmetry, there are no long tails in the
density distribution of the neutron spin polarization parameter (SkI3, SkI5
forces).


title:
Relativistic Hartree-Fock theory. Part I: density-dependent effective
  Lagrangians

abstract:
  Effective Lagrangians suitable for a relativistic Hartree-Fock description of
nuclear systems are presented. They include the 4 effective mesons $\sigma,
\omega, \rho$ and $\pi$ with density-dependent meson-nucleon couplings. The
criteria for determining the model parameters are the reproduction of the
binding energies in a number of selected nuclei, and the bulk properties of
nuclear matter (saturation point, compression modulus, symmetry energy). An
excellent description of nuclear binding energies and radii is achieved for a
range of nuclei encompassing light and heavy systems. The predictions of the
present approach compare favorably with those of existing relativistic mean
field models, with the advantage of incorporating the effects of pion-nucleon
coupling.


title: J/psi Production in Quark-Gluon Plasma

abstract:
  We study J/psi production at RHIC and LHC energies with both initial
production and regeneration. We solve the coupled set of transport equation for
the J/psi distribution in phase space and the hydrodynamic equation for
evolution of quark-gluon plasma. At RHIC, continuous regeneration is crucial
for the J/psi momentum distribution while the elliptic flow is still dominated
by initial production. At LHC energy, almost all the initially created J\psis
are dissociated in the medium and regeneration dominates the J/psi properties.


title:
Correlation energies in the random phase approximation using realistic
  interactions

abstract:
  The self-consistent random phase approximation (RPA) based on a correlated
realistic nucleon-nucleon interaction is used to evaluate correlation energies
in closed-shell nuclei beyond the Hartree-Fock level. The relevance of
contributions associated with charge exchange excitations as well as the
necessity to correct for the double counting of the second order contribution
to the RPA ring summation are emphasized. Once these effects are properly
accounted for, the RPA ring summation provides an efficient tool to assess the
impact of long-range correlations on binding energies throughout the whole
nuclear chart, which is of particular importance when starting from realistic
interactions.


title:
Rearrangement in folding potentials with density-dependent
  nucleon-nucleon interaction

abstract:
  We discuss optical potentials for the nuclear elastic scattering from a
variational viewpoint.
  Density-dependence in the effective $N$-$N$ interaction leads to density
rearrangement terms, in addition to the conventional folding term.
  Effects of the rearrangement on the $N$-$A$ optical potential are illustrated
in the nuclear-matter limit.
  Closely relating to consistency with the saturation, the rearrangement
appreciably improves the isoscalar optical potential depth over the previous
folding model calculations.
  The rearrangement gives stronger effects as the density grows.
  We also present rearrangement terms in the $A$-$A$ double-folding potential.
  Since the rearrangement terms are relevant to the nuclear structure but
should be handled within the reaction model,
  $N$-$N$ effective interactions applicable both to structure models and to the
folding model will be desired for unambiguous description of the nuclear
elastic scattering.


title: Neutron star matter in an effective model

abstract:
  We study the equation of state (EOS) for dense matter in the core of the
compact star with hyperons and calculate the star structure in an effective
model in the mean field approach. With varying incompressibility and effective
nucleon mass, we analyse the resulting EOS with hyperons in beta equilibrium
and its underlying effect on the gross properties of the compact star
sequences. The results obtained in our analysis are compared with predictions
of other theoretical models and observations. The maximum mass of the compact
star lies in the range $1.21-1.96 ~M_{\odot}$ for the different EOS obtained,
in the model.


title: Approximations of the spectral function

abstract:
  The ICARUS and future liquid argon neutrino experiments generate demand for
evaluating the spectral function of argon. In this paper we use oxygen nucleus
as a testing ground for our phenomenological approach to the spectral function
and probe the influence of momentum distribution and treatment of the mean
field spectral function on the differential cross sections. The obtained model
reproduces very well results of the exact spectral function of oxygen and can
be applied to heavier nuclei, such as calcium or argon.


title: Suppression of p-Wave Baryons in Quark Recombination

abstract:
  We show that the observed suppression of the $\Lambda(1520)/\Lambda$ ratio in
central Au + Au collisions at the Relativistic Heavy Ion Collider can be
naturally understood in the constituent quark recombination model.


title:
Universal Scaling of $p_T$ Distribution of Particles in Relativistic
  Nuclear Collisions

abstract:
  With the experimental data from STAR, PHENIX and BRAHMS on the centrality and
rapidity dependence of the $p_T$ spectrum in Au+Au and d+Au collisions, we show
that there exists a scaling distribution which is independent of the colliding
system, centrality and rapidity. The parameter for the average transverse
momentum $<p_T>$ increases from peripheral to central d+Au collisions. This
increase accounts for the enhancement of particle production in those
collisions. A non-extensive entropy is used to derive the scaling function.


title: Harmonic-Oscillator-Based Effective Theory

abstract:
  I describe harmonic-oscillator-based effective theory (HOBET) and explore the
extent to which the effects of excluded higher-energy oscillator shells can be
represented by a contact-gradient expansion in next-to-next-to-leading order
(NNLO). I find the expansion can be very successful provided the energy
dependence of the effective interaction, connected with missing long-wavelength
physics associated with low-energy breakup channels, is taken into account. I
discuss a modification that removes operator mixing from HOBET, simplifying the
task of determining the parameters of an NNLO interaction.


title:
Nuclear Structure in the UCOM Framework: From Realistic Interactions to
  Collective Excitations

abstract:
  The Unitary Correlation Operator Method (UCOM) provides a means for nuclear
structure calculations starting from realistic NN potentials. The dominant
short-range central and tensor correlations are described explicitly by a
unitary transformation. The application of UCOM in the context of the no-core
shell model provides insight into the interplay between dominant short-range
and residual long-range correlations in the nuclear many-body problem. The use
of the correlated interaction within Hartree-Fock, many-body perturbation
theory, and Random Phase Approximation gives access to various nuclear
structure observables throughout the nuclear chart.


title: Bulk viscosity in 2SC quark matter

abstract:
  The bulk viscosity of three-flavor color-superconducting quark matter
originating from the nonleptonic process u+s <-> u+d is computed. It is assumed
that up and down quarks form Cooper pairs while the strange quark remains
unpaired (2SC phase). A general derivation of the rate of strangeness
production is presented, involving contributions from a multitude of different
subprocesses, including subprocesses that involve different numbers of gapped
quarks as well as creation and annihilation of particles in the condensate. The
rate is then used to compute the bulk viscosity as a function of the
temperature, for an external oscillation frequency typical of a compact star
r-mode. We find that, for temperatures far below the critical temperature T_c
for 2SC pairing, the bulk viscosity of color-superconducting quark matter is
suppressed relative to that of unpaired quark matter, but for T >~ 10^(-3) T_c
the color-superconducting quark matter has a higher bulk viscosity. This is
potentially relevant for the suppression of r-mode instabilities early in the
life of a compact star.


title: The Complex Gap in Color Superconductivity

abstract:
  We solve the gap equation for color-superconducting quark matter in the 2SC
phase, including both the energy and the momentum dependence of the gap,
\phi=\phi(k_0,\vk). For that purpose a complex Ansatz for \phi is made. The
calculations are performed within an effective theory for cold and dense quark
matter. The solution of the complex gap equation is valid to subleading order
in the strong coupling constant g and in the limit of zero temperature. We find
that, for momenta sufficiently close to the Fermi surface and for small
energies, the dominant contribution to the imaginary part of $\phi$ arises from
Landau-damped magnetic gluons. Further away from the Fermi surface and for
larger energies the other gluon sectors have to be included into Im\phi. We
confirm that Im$ \phi$ contributes a correction of order g to the prefactor of
\phi for on-shell quasiquarks sufficiently close to the Fermi surface, whereas
further away from the Fermi surface Im\phi and Re\phi are of the same order.
Finally, we discuss the relevance of Im\phi for the damping of quasiquark
excitations.


title: Forward-Backward Charge Fluctuations at RHIC Energies

abstract:
  We use the ultra-relativistic quantum molecular dynamic UrQMD version 2.2 to
study forward backward fluctuations and compare our results with the published
data by the PHOBOS.


title: Dileptons and Medium Effects in Heavy-Ion Collisions

abstract:
  We discuss the status of calculating in-medium modifications of vector-meson
spectral functions in hot and dense matter, their application to dilepton
spectra in ultrarelativistic heavy-ion collisions, and possible relations to
chiral symmetry restoration. We emphasize the importance of constraining
in-medium spectral functions by empirical information from scattering data, QCD
sum rules, and lattice QCD. This is a mandatory prerequisite to arrive at
reliable predictions for low-mass dileptons in heavy-ion collisions.


title:
Late Hadronization and Matter Formed at RHIC: Vector Manifestation,
  Brown-Rho Scaling and Hadronic Freedom

abstract:
  Recent developments in our description of RHIC and related heavy-ion
phenomena in terms of hidden local symmetry theories are reviewed with a focus
on the novel nearly massless states in the vicinity of -- both below and above
-- the chiral restoration temperature T_c. We present complementary and
intuitive ways to understand both Harada-Yamawaki's vector manifestation
structure and Brown-Rho scaling -- which are closely related -- in terms of
"melting" of soft glues observed in lattice calculations and join the massless
modes that arise in the vector manifestation (in the chiral limit) just below
T_c to tightly bound massless states above T_c. This phenomenon may be
interpreted in terms of the Beg-Shei theorem. It is suggested that hidden local
symmetry theories arise naturally in holographic dual QCD from string theory,
and a clear understanding of what really happens near the critical point could
come from a deeper understanding of the dual bulk theory. Other matters
discussed are the relation between Brown-Rho scaling and Landau Fermi-liquid
fixed point parameters at the equilibrium density, its implications for
"low-mass dileptons" produced in heavy-ion collisions, the reconstruction of
vector mesons in peripheral collisions, the pion velocity in the vicinity of
the chiral transition point, kaon condensation viewed from the VM fixed point,
nuclear physics with Brown-Rho scaling, and the generic feature of dropping
masses at the RGE fixed points in generalized hidden local symmetry theories.


title: Parity Violation, the Neutron Radius of Lead, and Neutron Stars

abstract:
  The neutron radius of a heavy nucleus is a fundamental nuclear-structure
observable that remains elusive. Progress in this arena has been limited by the
exclusive use of hadronic probes that are hindered by large and controversial
uncertainties in the reaction mechanism. The Parity Radius Experiment at the
Jefferson Laboratory offers an attractive electro-weak alternative to the
hadronic program and promises to measure the neutron radius of 208Pb accurately
and model independently via parity-violating electron scattering. In this
contribution we examine the far-reaching implications that such a determination
will have in areas as diverse as nuclear structure, atomic parity violation,
and astrophysics.


title: In-medium Hadrons - Properties, Interaction and Formation

abstract:
  In this talk various aspects of in-medium behavior of hadrons are discussed
with an emphasis on observable effects. Examples for theoretical predictions of
in-medium spectral functions are given and the importance of resonance-hole
excitations is stressed. It is also stressed that final state interactions can
have a major effect on observables and thus have to be considered as part of
the theory. This is demonstrated with examples from neutrino-nucleus
interactions. Finally, the possibility to access hadron formation times in
high-energy photonuclear (or neutrino-induced) reactions is illustrated.


title:
On neutron number dependence of B(E1;0+ --> 1-) reduced transition
  probability

abstract:
  A neutron number dependence of the E1 0+ --> 1- reduced transition
probability in spherical even--even nuclei is analysed within the Q--phonon
approach in the fermionic space to describe the structure of collective states.
Microscopic calculations of the E1 0+ --> 1- transition matrix elements are
carried out for the Xe isotopes based on the RPA for the ground state wave
function. A satisfactory description of the experimental data is obtained.


title: Time Delay and Time Advance in Resonance Theory

abstract:
  We propose a theory of the resonance-antiresonance scattering process which
differs considerably from the classical one (the Breit-Wigner theory), which is
commonly used in the phenomenological analysis. Here both resonances and
antiresonances are described in terms of poles of the scattering amplitude: the
resonances by poles in the first quadrant while the antiresonances by poles in
the fourth quadrant of the complex angular momentum plane. The latter poles are
produced by non-local potentials, which derive from the Pauli exchange forces
acting among the nucleons or the quarks composing the colliding particles.


title: Kaon-Deuteron Scattering at Low Energies

abstract:
  We review the experimental information on the K^+d reaction for K-meson
momenta below 800 MeV/c. The data are analysed within the single scattering
impulse approximation -- utilizing the Juelich kaon-nucleon model -- that
allows to take into account effects due to the Fermi motion of the nucleons in
the deuteron and the final three-body kinematics for the break-up and charge
exchange reaction. We discuss the consistency between the data available for
the K^+d -> K^+np, K^+d -> K^0pp and K^+d -> K^+d reactions and the
calculations based on the spectator model formalism.


title:
Relativistic predictions of polarization phenomena in exclusive
  proton-induced proton-knockout reactions

abstract:
  Whereas a nonrelativistic distorted wave model fails to quantitatively
describe analyzing power data for exclusive proton-induced proton-knockout from
the 3s_{1/2} state in Pb-208 at 202 MeV, the corresponding relativistic
prediction provides a perfect description, thus suggesting that the Dirac
equation is the more appropriate underlying dynamical equation. We check the
consistency of this rsult by comparing predictions for both dynamical models to
new high resolution data for 3s_{1/2} knockout in Pb-208 at a higher incident
energy of 392 MeV.


title: David Brink: A long-standing teacher

abstract:
  This talk presents a short review of David Brink's most important
achievements and of my own experience working with him.

categories: nucl-th nucl-ex physics.hist-ph physics.soc-ph


title:
Magnetic dipole probes of the sd and pf shell crossing in the A=36,38
  argon isotopes

abstract:
  We have calculated the M1 strength distributions in the A=36,38 argon
isotopes within large-scale shell model studies which consider valence nucleons
in the sd and pf shells. While the M1 strength in 36Ar is well reproduced
within the sd shell, the experimentally observed strong fragmentation of the M1
strength in 38Ar requires configuration mixing between the sd and the pf shells
adding to our understanding of correlations across the N=20 shell gap.


title: QCD Matter: A Search for a Mixed Quark-Hadron Phase

abstract:
  Physics aspects of a JINR project to reach the planned 5A GeV energy for the
Au and U beams and to increase the bombarding energy up to 10A GeV are
discussed. The project aims to search for a possible formation of a strongly
interacting mixed quark-hadron phase. The relevant problems are exemplified. A
need for scanning heavy-ion interactions in bombarding energy, collision
centrality and isospin asymmetry is emphasized.


title: Charm and Charmonium in the Quark-Gluon Plasma

abstract:
  In the first part of the talk, we briefly review the problem of parton-energy
loss and thermalization at the Relativistic Heavy-Ion Collider and discuss how
heavy quarks (charm and bottom) can help to resolve the existing experimental
and theoretical puzzles. The second part of the talk is devoted to the
properties of heavy quarkonia in the (strongly interacting) Quark-Gluon Plasma
(sQGP) and their consequences for observables in heavy-ion collisions.


title:
Effects of $\omega$ meson self-coupling on the properties of finite
  nuclei and neutron stars

abstract:
  The effects of $\omega$ meson self-coupling (OMSC) on the properties of
finite nuclei and neutron stars are investigated within the framework of
effective field theory based relativistic mean-field (ERMF) model which
includes the contributions from all possible mixed interactions between the
scalar-isoscalar ($\sigma$), vector-isoscalar ($\omega$) and vector-isovector
($\rho$) mesons upto the quartic order. For a realistic investigation, several
parameter sets corresponding to different values of OMSC are generated by
adjusting the remaining parameters of the ERMF model to fit the properties of
the finite nuclei. Though, all these parameter sets give equally good fit to
the properties of the finite nuclei, only moderate values of OMSC are favored
from the "naturalness" point of view. The equation of state for the symmetric
nuclear and pure neutron matters resulting from the parameter sets with the
moderate values of OMSC are in close agreement with the ones obtained within
the Dirac-Brueckner-Hartree-Fock approximation. For such parameter sets the
limiting mass for the neutron stars composed of $\beta$-stable matter is $\sim
1.9M_\odot$. It is found that the direct Urca process can occur in the neutron
stars with "canonical" mass of $1.4M_\odot$ only for the moderate and higher
values of OMSC. Some other interesting properties for the neutron stars are
also discussed.


title: Nuclei as Laboratories: Nuclear Tests of Fundamental Symmetries

abstract:
  The prospect of a rare isosotope accelerator facility opens up possibilities
for a new generation of nuclear tests of fundamental symmetries. In this talk,
I survey the current landscape of such tests and discuss future opportunities
that a new facility might present.


title:
Chiral effective theory predictions for deuteron form factor ratios at
  low Q^2

abstract:
  We use chiral effective theory to predict the deuteron form factor ratio
G_C/G_Q as well as ratios of deuteron to nucleon form factors. These ratios are
calculated to next-to-next-to-leading order. At this order the chiral expansion
for the NN isoscalar charge operator (including consistently calculated 1/M
corrections) is a parameter-free prediction of the effective theory. Use of
this operator in conjunction with NLO and NNLO chiral effective theory wave
functions produces results that are consistent with extant experimental data
for Q^2 < 0.35 GeV^2. These wave functions predict a deuteron quadrupole moment
G_Q(Q^2=0)=0.278-0.282 fm^2-with the variation arising from short-distance
contributions to this quantity. The variation is of the same size as the
discrepancy between the theoretical result and the experimental value. This
motivates the renormalization of G_Q via a two-nucleon operator that couples to
quadrupole photons. After that renormalization we obtain a robust prediction
for the shape of G_C/G_Q at Q^2 < 0.3 GeV^2. This allows us to make precise,
model-independent predictions for the values of this ratio that will be
measured at the lower end of the kinematic range explored at BLAST. We also
present results for the ratio G_C/G_M.


title: In-Medium Effects in Photo- and Neutrino-Induced Reactions on Nuclei

abstract:
  In this talk various aspects of in-medium behavior of hadrons are discussed
with an emphasis on observable effects. It is stressed that final state
interactions can have a major effect on observables and thus have to be
considered as part of the theory. This is demonstrated with examples from
photo-nucleus and neutrino-nucleus interactions.


title:
Charged Particle Multiplicities in A+A and p+p Collisions in the
  Constituent Quarks Framework

abstract:
  Charged particle multiplicities in A+A and p(pbar)+p collisions as a function
of pseudorapidity, centrality and energy are studied in both the nucleon and
the constituent quark frameworks. In the present work, the calculation of the
number of nucleon and constituent quark participants using the nuclear overlap
model takes into account the fact that for the peripheral A+A and p+p
collisions can not be smaller than two. A striking agreement is seen between
the particle density in A+A and p(pbar)+p collisions, both at mid-rapidity and
in the fragmentation regions, when normalized to the number of participating
constituent quarks. The observations presented in this paper imply that the
number of constituent quark pairs participating in the collision controls the
particle production. One may therefore conjecture that the initial states in
A+A and p(pbar)+p collisions are similar when the partonic considerations are
used in normalization.


title: Meson spectroscopy and properties using Dyson-Schwinger equations

abstract:
  We study pseudoscalar and scalar mesons using a practical and symmetry
preserving truncation of QCD's Dyson-Schwinger equations. We investigate and
compare properties of ground and radially excited meson states. In addition to
exact results for radial meson excitations we also present results for meson
masses and decay constants from the chiral limit up to the charm-quark mass, e.
g., the mass of the chi_{c0} (2P) meson.


title:
A relativistic framework to determine the nuclear transparency from
  A(p,2p) reactions

abstract:
  A relativistic framework for computing the nuclear transparency extracted
from A(p,2p) scattering processes is presented. The model accounts for the
initial- and final-state interactions (IFSI) within the relativistic
multiple-scattering Glauber approximation (RMSGA). For the description of color
transparency, two existing models are used. The nuclear filtering mechanism is
implemented as a possible explanation for the oscillatory energy dependence of
the transparency. Results are presented for the target nuclei 7Li, 12C, 27Al,
and 63Cu. An approximated, computationally less intensive version of the RMSGA
framework is found to be sufficiently accurate for the calculation of the
nuclear transparency. After including the nuclear filtering and color
transparency mechanisms, our calculations are in acceptable agreement with the
data.


title:
Theoretical Analysis of Dilepton Spectra in Heavy Ion Collisions at
  GSI-FAIR Energies

abstract:
  This paper addresses the theoretical analysis of dilepton spectra in C+C
collisions at GSI-SIS energies. Theoretical predictions for the recent data of
the HADES collaboration at SIS-energies are made with the help of a
hadron-string transport model, the Ultra-relativistic Quantum Molecular
Dynamics (UrQMD) model. A mass shift of the $\rho$ meson due to kinematical
effects is discussed.


title:
Dispersive and absorptive corrections to the pion-deuteron scattering
  length

abstract:
  We present a parameter--free calculation of the dispersive and absorptive
contributions to the pion--deuteron scattering length based on chiral
perturbation theory. We show that once all diagrams contributing to leading
order to this process are included, their net effect provides a small
correction to the real part of the pion--deuteron scattering length.
  At the same time the sizable imaginary part of the pion--deuteron scattering
length is reproduced accurately.


title:
Resolving the plasma profile via differential single inclusive
  suppression

abstract:
  The ability of experimental signatures to resolve the spatio-temporal profile
of an expanding quark gluon plasma is studied. In particular, the single
inclusive suppression of high momentum hadrons versus the centrality of a
heavy-ion collision and with respect to the reaction plane in non-central
collisions is critically examined. Calculations are performed in the higher
twist formalism for the modification of the fragmentation functions. Radically
different nuclear geometries are used. The influence of different initial gluon
distributions as well as different temporal evolution scenarios on the single
inclusive suppression of high momentum pions are outlined. It is demonstrated
that the modification versus the reaction plane is quite sensitive to the
initial spatial density. Such sensitivity remains even in the presence of a
strong elliptic flow.


title: Cold, dense nuclear matter in a SU(2) parity doublet model

abstract:
  We study dense nuclear matter and the chiral phase transition in a SU(2)
parity doublet model at zero temperature. The model is defined by adding the
chiral partner of the nucleon, the N', to the linear sigma model, treating the
mass of the N' as an unknown free parameter. The parity doublet model gives a
reasonable description of the properties of cold nuclear matter, and avoids
unphysical behaviour present in the standard SU(2) linear sigma model. If the
N' is identified as the N'(1535), the parity doublet model shows a first order
phase transition to a chirally restored phase at large densities, $\rho \approx
10 \rho_0$, defining the transition by the degeneracy of the masses of the
nucleon and the N'. If the mass of the N' is chosen to be 1.2 GeV, then the
critical density of the chiral phase transition is lowered to three times
normal nuclear matter density, and for physical values of the pion mass, the
first order transition turns into a smooth crossover.


title:
Effect of electronic environment on neutrino-nucleus reactions at
  r-process sites

abstract:
  We discuss effects of the electron plasma on charged-current neutrino-nucleus
reaction, $(\nu_e,e^-)$ in a core-collapse supernova environment. We first
discuss the electron screening effect on the final state interaction between
the outgoing electron and the daughter nucleus. To this end, we solve the Dirac
equation for the outgoing electron with the screened Coulomb potential obtained
with the Thomas-Fermi approximation. In addition to the screening effect, we
also discuss the Pauli blocking effect due to the environmental electrons on
the spectrum of the outgoing electron. We find that both effects hinder the
cross section of the charged-current reaction, especially at low incident
energies.


title: A semiclassical description of the Autocorrelations in Nuclear Masses

abstract:
  Nuclear mass autocorrelations are investigated as a function of the number of
nucleons. The fluctuating part of these autocorrelations is modeled by a
parameter free model in which the nucleons are confined in a rigid sphere.
Explicit results are obtained by using periodic orbit theory. Despite the
simplicity of the model we have found a remarkable quantitative agreement of
the mass autocorrelations for all nuclei in the nuclear data chart. In order to
achieve a similar degree of agreement for the nuclear masses themselves it is
necessary to consider additional variables such as multipolar corrections to
the spherical shape and an effective number of nucleons. Our findings suggest
that higher order effects like nuclear deformations or residual interactions
have little relevance in the description of the fluctuations of the nuclear
autocorrelations.


title: Neutrinos, Weak Interactions, and r-process Nucleosynthesis

abstract:
  Two of the key issues in understanding the neutron-to-proton ratio in a
core-collapse supernova are discussed. One of these is the behavior of the
neutrino-nucleon cross sections as supernova energies. The other issue is the
many-body properties of the neutrino gas near the core when both one- and
two-body interaction terms are included.


title: Pairing collectivity in medium-mass neutron-rich nuclei near drip-line

abstract:
  We look for collective excitations originating from the strong surface
pairing in unstable nuclei near the neutron drip-line. The soft dipole
excitation is such a pairing mode as it exhibits a character of
core-vs-dineutron motion. Possibility of the hydrodynamic phonon mode (the
Anderson-Bogoliubov mode) is also discussed.


title: Alpha decay rate enhancement in metals: An unlikely scenario

abstract:
  It has been recently suggested that one might drastically shorten the alpha
lifetime of nuclear waste products, if these are embedded in metals at low
temperatures. Using quantum mechanical tunneling arguments, we show that such
an effect is likely to be very small, if present at all.


title: Three-Particle Correlations from Parton Cascades in Au+Au Collisions

abstract:
  We present a study of three-particle correlations among a trigger particle
and two associated particles in Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
using a multi-phase transport model (AMPT) with both partonic and hadronic
interactions. We found that three-particle correlation densities in different
angular directions with respect to the triggered particle (`center', `cone',
`deflected', `near' and `near-away') increase with the number of participants.
The ratio of `deflected' to `cone' density approaches to 1.0 with the
increasing of number of participants, which indicates that partonic Mach-like
shock waves can be produced by strong parton cascades in central Au+Au
collisions.


title:
Dynamical coupled-channel model of meson production reactions in the
  nucleon resonance region

abstract:
  A dynamical coupled-channel model is presented for investigating the nucleon
resonances in the meson production reactions induced by pions and photons. The
model is based on an energy-independent Hamiltonian which is derived from a set
of Lagrangians by using a unitary transformation method. By applying the
projection operator techniques,we derive a set of coupled-channel equations
which satisfy the unitarity conditions within the channel space spanned by the
considered two-particle meson-baryon states and the three-particle $\pi\pi N$
state. We present and explain in detail a numerical method based on a
spline-function expansion for solving the resulting coupled-channel equations
which contain logarithmically divergent one-particle-exchange driving terms
resulted from the $\pi\pi N$ unitarity cut. We show that this driving term can
generate rapidly varying structure in the reaction amplitudes associated with
the unstable particle channels. It also has large effects in determining the
two-pion production cross sections. Our results indicate that cautions must be
taken to interpret the $N^*$ parameters extracted from using models which do
not include $\pi\pi N$ cut effects.


title:
Polarization observables in exclusive kaon photoproduction on the
  deuteron

abstract:
  Single and double polarization observables for kaon photoproduction on the
deuteron are studied theoretically with modern hyperon-nucleon forces. The
kinematical region of the kaon scattered forward with large momentum is
thoroughly investigated where either the quasifree scattering leading to the
kaon and hyperon or the final-state interaction between hyperon and nucleon are
expected. The quasifree scatterings show characteristic peaks in the inclusive
cross sections. The final-state interaction effects are significant, especially
around the Lambda-N and Sigma-N thresholds. The double polarization C_z is
found to be sensitive to the final-state interaction effects. Precise data
would help to clarify the property of the Lambda-N--Sigma-N interaction and
also help to extract the information on the elementary amplitude from the
quasifree scattering region.


title:
K0 photoproduction on the deuteron and the extraction of the elementary
  amplitude

abstract:
  The photoproduction of K0 on the deuteron has been investigated with the
inclusion of YN and KN final-state interaction (FSI), as well as the
pion-mediated process gamma d --> pi NN --> KYN. The YN rescattering effects
for the inclusive cross section are found to be large in the threshold regions.
Polarization observables show sizable FSI effects at larger kaon and hyperon
angles. It is shown that the extraction of the elementary gamma N --> KY
amplitude is possible in the quasi-free scattering region where FSI effects are
negligible. Furthermore, the cross sections in this region are large,
indicating that measurements in this kinematical region are favored.


title: Problems with interpretation of $^{10}$He ground state

abstract:
  The continuum of $^{10}$He nucleus is studied theoretically in a three-body
$^{8}$He+$n$+$n$ model basing on the recent information concerning $^9$He
spectrum [Golovkov, \textit{et al.}, Phys. Rev. C \textbf{76}, 021605(R)
(2007)]. The $^{10}$He ground state (g.s.) candidate with structure
$[p_{1/2}]^2$ for new g.s. energy of $^9$He is predicted to be at about
$2.0-2.3$ MeV. The peak in the cross section associated with this state may be
shifted to a lower energy (e.g. $\sim 1.2$ MeV) when $^{10}$He is populated in
reactions with $^{11}$Li due to peculiar reaction mechanism. Formation of the
low-energy ($E< 250$ keV) ``alternative'' ground state with structure
$[s_{1/2}]^2$ is highly probable in $^{10}$He in the case of considerable
attraction (e.g. $a<-5$ fm) in the s-wave $^9$He channel, which properties are
still quite uncertain. This result either questions the existing experimental
low-energy spectrum of $^{10}$He or place a limit on the scattering length in
$^9$He channel, which contradicts existing data.


title: A Reanalysis of the LSND Neutrino Oscillation Experiment

abstract:
  We reanalyse the LSND neutrino oscillation results in the framework of the
Projected Quasiparticle Random Phase Approximation (PQRPA), which is the only
RPA model that treats the Pauli Principle correctly, and accounts
satisfactorily for great majority of the weak decay observables around 12C. We
have found that the employment of the PQRPA inclusive DIF 12C(nu_e,e-)12N
cross-section, instead of the CRPA used by the LSND collaboration in the (nu_mu
->nu_e) oscillations study of the 1993-1995 data sample, leads to the
following: 1) the oscillation probability is increased from (0.26 +/- 0.10 +/-
0.05) percents to (0.33 +/- 0.10 +/- 0.13) percents, and 2) the previously
found consistence between the (sin^2 2theta, Delta m^2) confidence level
regions for the (nu_mu -> nu_e) and the (bar{nu}_mu -> bar{nu}_e) oscillations
is significantly diminished. These effects are not due to the difference in the
uncertainty ranges for the neutrino-nucleus cross-section, but to the
difference in the cross-sections themselves.


title: Neutrino Nucleus Reactions based on New Shell Model Hamiltonians

abstract:
  A new shell model Hamiltonian for p-shell nuclei which properly takes into
account important roles of spin-isospin interactions is used to obtain cross
sections of neutrino-^12C reactions induced by decay-at-rest (DAR) neutrinos as
well as supernona neutrinos. Branching ratios to various decay channels are
calculated by the Hauser-Feshbach theory. Neutrino-^4He reactions are also
investigated by using recent shell model Hamiltonians. The reaction cross
sections are found to be enhanced for both ^12C and ^4He compared with previous
calculations. As an interesting consequence of this, a possible enhancement of
the production yields of light elements, ^7Li and ^11B, during supernova
explosions is pointed out.


title: A Fast Hadron Freeze-out Generator

abstract:
  We have developed a fast Monte Carlo procedure of hadron generation allowing
one to study and analyze various observables for stable hadrons and hadron
resonances produced in ultra-relativistic heavy ion collisions. Particle
multiplicities are determined based on the concept of chemical freeze-out.
Particles can be generated on the chemical or thermal freeze-out hypersurface
represented by a parameterization or a numerical solution of relativistic
hydrodynamics with given initial conditions and equation of state. Besides
standard space-like sectors associated with the volume decay, the hypersurface
may also include non-space-like sectors related to the emission from the
surface of expanding system. For comparison with other models and experimental
data we demonstrate the results based on the standard parameterizations of the
hadron freeze-out hypersurface and flow velocity profile under the assumption
of a common chemical and thermal freeze-out. The C++ generator code is written
under the ROOT framework and is available for public use at
http://uhkm.jinr.ru/.


title: Collisional energy loss and the suppression of high $p_T$ hadrons

abstract:
  We calculate nuclear suppression factor ($R_{AA}$) for light hadrons by
taking only the elastic processes and argue that in the measured $p_T$ domain
of RHIC, collisional rather than the radiative processes is the dominant
mechanism for partonic energy loss.


title:
Theoretical Standard Model Rates of Proton to Neutron Conversions Near
  Metallic Hydride Surfaces

abstract:
  The process of radiation induced electron capture by protons or deuterons
producing new ultra low momentum neutrons and neutrinos may be theoretically
described within the standard field theoretical model of electroweak
interactions. For protons or deuterons in the neighborhoods of surfaces of
condensed matter metallic hydride cathodes, such conversions are determined in
part by the collective plasma modes of the participating charged particles,
e.g. electrons and protons. The radiation energy required for such low energy
nuclear reactions may be supplied by the applied voltage required to push a
strong charged current across a metallic hydride surface employed as a cathode
within a chemical cell. The electroweak rates of the resulting ultra low
momentum neutron production are computed from these considerations.


title:
An inversion-asymmetric source function for HBT analysis in relativistic
  heavy ion collisions

abstract:
  The inversion-asymmetry of the emission source in relativistic heavy ion
collision under the Bertsch-Pratt convention is discussed and explicitly
exhibited by a Monte Carlo model. The Gaussian source function popularly used
in the HBT analysis of relativistic heavy ion collisions is invalid in this
case. An inversion-asymmetric source function is suggested. A method for
extracting the inversion-asymmetry degree of the source together with the
source size from experimental data is proposed.


title: Hadron Resonances and Phase Threshold in Heavy Ion Collisions

abstract:
  We show that a measurement of the reaction energy dependence of relative
hadron resonance yields in heavy ion collisions can be used to study the phase
structure of the dense QCD matter created in these collisions, and investigate
the origin of the trends observed in the excitation functions of certain soft
hadronic observables. We show that presence of chemical nonequilibrium in light
quark abundance imparts a characteristic signature on the energy dependence of
resonance yields, that differs considerably from what is expected in the
equilibrium picture.


title: Nucleon sigma term and quark condensate in nuclear matter

abstract:
  We study the bound nucleon sigma term and the quark condensate in nuclear
matter. In the quark-meson coupling (QMC) model the nuclear correction to the
sigma term is small and negative, i.e., it decelerates the decrease of the
quark condensate in nuclear matter. However, the quark condensate in nuclear
matter is controlled primarily by the scalar-isoscalar $\sigma$ field. Compared
to the leading term, it moderates the decrease more than that of the nuclear
sigma term alone at densities around and larger than the normal nuclear matter
density.


title: $D$-dimensions Dirac fermions BEC-BCS cross-over thermodynamics

abstract:
  An effective Proca Lagrangian action is used to address the vector
condensation Lorentz violation effects on the equation of state of the strongly
interacting fermions system. The interior quantum fluctuation effects are
incorporated as an external field approximation indirectly through a fictive
generalized Thomson Problem counterterm background. The general analytical
formulas for the $d$-dimensions thermodynamics are given near the unitary limit
region. In the non-relativistic limit for $d=3$, the universal dimensionless
coefficient $\xi ={4}/{9}$ and energy gap $\Delta/\epsilon_f ={5}/{18}$ are
reasonably consistent with the existed theoretical and experimental results. In
the unitary limit for $d=2$ and T=0, the universal coefficient can even
approach the extreme occasion $\xi=0$ corresponding to the infinite effective
fermion mass $m^*=\infty$ which can be mapped to the strongly coupled
two-dimensions electrons and is quite similar to the three-dimensions
Bose-Einstein Condensation of ideal boson gas. Instead, for $d=1$, the
universal coefficient $\xi$ is negative, implying the non-existence of phase
transition from superfluidity to normal state. The solutions manifest the
quantum Ising universal class characteristic of the strongly coupled unitary
fermions gas.

categories: nucl-th astro-ph cond-mat.stat-mech hep-ph


title: Coefficients and terms of the liquid drop model and mass formula

abstract:
  The coefficients of different combinations of terms of the liquid drop model
have been determined by a least square fitting procedure to the experimental
atomic masses. The nuclear masses can also be reproduced using a Coulomb radius
taking into account the increase of the ratio $R\_0/A^{1/3}$ with increasing
mass, the fitted surface energy coefficient remaining around 18 MeV.


title: Pion and Kaon Production in Nucleon - Nucleon Collisions

abstract:
  Inclusive cross section for pion production in proton - proton collisions are
calculated based on unintegrated parton distribution functions (uPDFs). In
addition to purely gluonic terms the present approach includes also quark
degrees of freedom. Phenomenological fragmentation functions from the
literature are used. The new mechanisms are responsible for $\pi^+$ - $\pi^-$
asymmetry. In contrast to standard collinear approach, application of 2 $\to$ 1
$k_t$ - factorization approach can be extended towards much lower transverse
momenta, both at mid and forward rapidity region. The results of the
calculation are compared with SPS and RHIC data.


title: Renormalization of the SU(2)-symmetric model of hadrodynamics

abstract:
  It is proved that the SU(2)-symmetric model of hadrodynamics can well be set
up on the gauge-invariance principle. The quantization of the model can readily
be performed in the Lagrangian path-integral formalisms by using the Lagrangian
undetermined multiplier method. Furthermore, it is shown that the quantum
theory is invariant with respect to a kind of BRST-transformations. From the
BRST-symmetry of the theory, the Ward-Takahashi identities satisfied by the
generating functionals of full Green functions, connected Green functions and
proper vertex functions are successively derived. As an application of the
above Ward-Takahashi identities, the Ward-Takahashi identities obeyed by the
propagators and various proper vertices are derived. Based on these identities,
the propagators and vertices are perfectly renormalized. Especially, as a
result of the renormalization, the Slavnov-Taylor identity satisfied by
renormalization constants is natually deduced. To demonstrate the
renormalizability of the theory, the one-loop renormalization of the theory is
carried out by means of the mass-dependent momentum space subtraction and the
renormalization group approach, giving an exact one-loop effective coupling
constant and one-loop effective nucleon, pion and $\rho -$meson masses.


title:
On the necessity to include event-by-event fluctuations in experimental
  evaluation of elliptical flow

abstract:
  Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. We show
that when symmetry of the particle distribution in relation to the reaction
plane is assumed, as usually done in the experimental extraction of elliptic
flow, there is a disagreement between the true and reconstructed elliptic flows
(15-30% for $\eta$=0, 30% for $p_\perp$=0.5 GeV). We suggest a possible way to
take into account the asymmetry and get good agreement between these elliptic
flows.


title: Recent advances in the theory of nuclear forces

abstract:
  After a brief historical review, we present recent progress in our
understanding of nuclear forces in terms of chiral effective field theory.


title: Heavy quarks at RHIC from parton transport theory

abstract:
  There are several indications that an opaque partonic medium is created in
energetic Au+Au collisions \sqrt{s} ~ 100 GeV/nucleon at the Relativistic Heavy
Ion Collider (RHIC). At the extreme densities of ~ 10-100 times normal nuclear
density reached even heavy-flavor hadrons are affected significantly.
Heavy-quark observables are presented from the parton transport model MPC,
focusing on the nuclear suppression pattern, azimuthal anisotropy ("elliptic
flow"), and azimuthal correlations. Comparison with Au+Au data at top RHIC
energy \sqrt{s} = 200 GeV indicates significant heavy quark rescattering,
corresponding to roughly five times higher opacities than estimates based on
leading-order perturbative QCD. We propose measurements of charm-anticharm,
e.g., D-meson azimuthal correlations as a sensitive, independent probe to
corroborate these findings.


title: The Letter "s" (and the sQGP)

abstract:
  Data from the Relativistic Heavy Ion Collider over the last five years has
led many to conclude that the medium created is not the expected quark gluon
plasma (QGP), but rather a strongly coupled or strongly interacting quark gluon
plasma (sQGP). We explore the meaning of this possible paradigm shift and some
of the experimental and theoretical arguments that are associated with it. In
this proceedings we detail only a small subset of the relevant issues as
discussed at the Hot Quarks 2006 workshop.


title: Proton emission induced by polarized photons

abstract:
  The proton emission induced by polarized photons is studied in the energy
range above the giant resonance region and below the pion emission threshold.
Results for the 12C, 16O and 40Ca nuclei are presented. The sensitivity of
various observables to final state interaction, meson exchange currents and
short range correlations is analyzed. We found relevant effects due to the
virtual excitation of the $\Delta$ resonance.


title: K^- ^3He and K^+K^- interactions in the pd -> ^3He K^+K^- reaction

abstract:
  We investigate the K^- ^3He and K^+ K^- interactions in the reaction pd ->
^3He K^+ K^- near threshold and compare our model calculations with data from
the MOMO experiment at COSY-Juelich. A large attractive effective K^- p
amplitude would give a significant K^- ^3He final-state interaction effect
which is not supported by the experimental data. We also estimate upper limits
for the a_0(980) and f_0(980) contributions to the produced K^+ K^- pairs.


title: Parity Inversion And Different Properties of Be11 halo Nuclei

abstract:
  The recent developments of radioactive nuclear beams has opened up the
possibility of exploring a wide variety of nuclei far from the valley of
beta-stability. Of late several theoretical studies have come up in the past
for describing nuclei in these exotic region. Extension of traditional shell
model techniques to explain the exotic feature in the structure of these nuclei
such as, formation of neutron halo large r.m.s radii, soft dipole resonances
etc have confirmed the necessity to modify the single particle shell model
potential when dealing with nuclei far from stability. The ground state nuclear
structure properties of 4Be11 have been calculated in the framework of shell
model using analytically soluble mean field potential given by Ginocchio. The
potential is highly versatile in nature and depends on four parameters, which
define its depth, range and shape. Potential parameters, which generate highly
diffuse shape, account for the small binding and halo structure of the valence
neutron in 4Be11. The problem of ground state parity inversion is also
addressed.


title:
Extended-soft-core baryon-baryon model III. $S=-2$
  hyperon-hyperon/nucleon interaction

abstract:
  This paper presents the Extended-Soft-Core (ESC) potentials ESC04a-d for
baryon-baryon channels with total strangeness $S=-2$. For these channels no
experimental scattering data exist, and alsothe information from hypernuclei is
very limited.The potential models for $S=-2$ are based on SU(3) extensions of
potential models for the $S=0,-1$ sectors, which are fitted to experimental
data. Flavor su(3)-symmetry is broken 'kinematically'by the masses of the
baryons and the mesons.Moreover, in ESC04a,b aldo the coupling constants are
broken, albeit in a well defined way using the $^3P_0$ quark-antiquark pair
creation model as a guidance. But the fit to the S=0 and $S=-1$ sectors
provides the necessary constraints to fix all free parameters.Therefore, the
potentials for the $S=-2$ sectors do not contain additional free parameters,
which situation is similar to the soft-core one-boson-exchange NSC97-models.
Various properties of the potentials are illustrated by giving results for
scattering lengths, bound states, phase-parameters, and total cross sections.
The features of $\Xi$-hypernuclei predicted by ESC04d are studied on the basis
of the G-matrix approach.


title: Effect of Rescattering on Forward-Backward Correlations

abstract:
  We use the Ultra-relativistic Quantum Molecular Dynamic model (UrQMD v2.2) to
study forward-backward fluctuations and compare our results with the data
published by the PHOBOS experiment. The extracted effective cluster
multiplicities show a clear centrality dependence within the present
hadron-string transport approach. This behavior is not reproduced with models
not taking into account final state rescattering.


title: Phenomenological hadron form factors: shape and relativity

abstract:
  The use of relativistic quark models with simple parametric wave functions
for the understanding of the electromagnetic structure of nucleons together
with their electromagnetic transition to resonances is discussed. The
implications of relativity in the different ways it can be implemented in a
simple model are studied together with the role played by mixed symmetry
s-state and D-state deformations of the rest frame wave functions of the
nucleon and Delta resonance.


title:
Away-side distribution in a parton multiple scattering model and
  background-suppressed measures

abstract:
  A model of parton multiple scattering in a dense and expanding medium is
described. The simulated results reproduce the general features of the data. In
particular, in the intermediate trigger momentum region there is a dip-bump
structure, while at higher trigger momentum the double bumps merge into a
central peak. Also, a new measure is proposed to quantify the azimuthal
distribution with the virtue that it suppresses the statistical fluctuations
event-by-event, while enhancing the even-structure of the signal.


title:
Chiral phase transition in an extended NJL model with higher-order
  multi-quark interactions

abstract:
  The chiral phase transition is studied in an extended Nambu--Jona-Lasinio
model with eight-quark interactions. Equations for scalar and vector quark
densities, derived in the mean field approximation, are nonlinear and mutually
coupled. The scalar-type nonlinear term hastens the restoration of chiral
symmetry, while the scalar-vector mixing term makes the transition sharper. The
scalar-type nonlinear term shifts the critical endpoint toward the values
predicted by lattice QCD simulations and the QCD-like theory.


title: Isospin breaking in the vector current of the nucleon

abstract:
  Extraction of the nucleon's strange form factors from experimental data
requires a quantitative understanding of the unavoidable contamination from
isospin violation. A number of authors have addressed this issue during the
past decade, and their work is reviewed here. The predictions from early models
are largely consistent with recent results that rely as much as possible on
input from QCD symmetries and related experimental data. The resulting bounds
on isospin violation are sufficiently precise to be of value to on-going
experimental and theoretical studies of the nucleon's strange form factors.


title:
Effects of the neutrino electromagnetic form factors on the neutrino and
  antineutrino mean free paths in dense matter

abstract:
  We have studied the effects of the nucleon weak magnetism and the neutrino
electromagnetic properties on the neutrino and antineutrino mean free paths for
all types of neutrinos. In the calculation, we consider matters with and
without neutrino trapping as the target. We have found that the difference
between the two mean free paths depends not only on the neutrino energy, but
also on the matter density as well as matter constituents. Compared to the
nucleon weak magnetism, the neutrino electromagnetic properties are found to
have negligible effects on this difference.


title: Two-level interacting boson models beyond the mean field

abstract:
  The phase diagram of two-level boson Hamiltonians, including the Interacting
Boson Model (IBM), is studied beyond the standard mean field approximation
using the Holstein-Primakoff mapping. The limitations of the usual intrinsic
state (mean field) formalism concerning finite-size effects are pointed out.
The analytic results are compared to numerics obtained from exact
diagonalizations. Excitation energies and occupation numbers are studied in
different model space regions (Casten triangle for IBM) and especially at the
critical points.


title: Electron scattering form factors from exotic nuclei

abstract:
  The elastic electron scattering form factors, longitudinal and transverse,
from the He and Li isotopes and from 8B have been studied. Large space shell
model functions have been assumed. The precise distribution of the neutron
excess has little effect on the form factors of the isotopes though there is a
mass dependence in the charge densities. However, the form factors of the
proton-rich nucleus, 8B, are significantly changed by the presence of the
proton halo.


title: Low-momentum interactions with smooth cutoffs

abstract:
  Nucleon-nucleon potentials evolved to low momentum, which show great promise
in few- and many-body calculations, have generally been formulated with a sharp
cutoff on relative momenta. However, a sharp cutoff has technical disadvantages
and can cause convergence problems at the 10-100 keV level in the deuteron and
triton. This motivates using smooth momentum-space regulators as an
alternative. We generate low-momentum interactions with smooth cutoffs both
through energy-independent renormalization group methods and using a multi-step
process based on the Bloch-Horowitz approach. We find greatly improved
convergence for calculations of the deuteron and triton binding energies in a
harmonic oscillator basis compared to results with a sharp cutoff. Even a
slight evolution of chiral effective field theory interactions to lower momenta
is beneficial. The renormalization group preserves the long-range part of the
interaction, and consequently the renormalization of long-range operators, such
as the quadrupole moment, the radius and 1/r, is small. This demonstrates that
low-energy observables in the deuteron are reproduced without short-range
correlations in the wave function.


title:
Doorway states in nuclear reactions as a manifestation of the
  "super-radiant" mechanism

abstract:
  A mechanism is considered for generating doorway states and intermediate
structure in low-energy nuclear reactions as a result of collectivization of
widths of unstable intrinsic states coupled to common decay channels. At the
limit of strong continuum coupling, the segregation of broad
(''super-radiating") and narrow (''trapped") states occurs revealing the
separation of direct and compound processes. We discuss the conditions for the
appearance of intermediate structure in this process and doorways related to
certain decay channels.


title: Shell model for heavy nuclei and its application in nuclear astrophysics

abstract:
  Performing shell model calculations for heavy nuclei is a long-standing
problem in nuclear physics. The shell model truncation in the configuration
space is an unavoidable step. The Projected Shell Model (PSM) truncates the
space under the guidance of the deformed mean-field solutions. This implies
that the PSM uses a novel and efficient way to bridge the two conventional
methods: the deformed mean-field approximations, which are widely applied to
heavy nuclei but able to describe the physics only in the intrinsic frame, and
the spherical shell model diagonalization method, which is most fundamental but
feasible only for small systems. We discuss the basic philosophy in
construction of the PSM (or generally PSM-like) approach. Several examples from
the PSM calculations are presented. Astrophysical applications are emphasized.


title: Nuclear Astrophysics: CIPANP 2006

abstract:
  I review progress that has been made in nuclear astrophysics over the past
few years and summarize some of the questions that remain. Topics selected
include solar neutrinos, supernovae (the explosion and associated
nucleosynthesis), laboratory astrophysics, and neutron star structure.


title:
Advances in the field-theoretic understanding of pion production in
  nucleon-nucleon collisions

abstract:
  We study the production amplitude for the reaction $NN\to NN\pi$ up to
next-to-leading order in chiral perturbation theory. We show that the
irreducible chiral loops at this order exactly cancel those terms that arise
from the off-shell parts of the $\pi N$ rescattering vertex. This cancellation
is required for formal consistency of the whole scheme. The net effect of the
inclusion of all next-to-leading order loops is to enhance the leading
rescattering amplitude by a factor of 4/3 compared to phenomenological studies,
bringing its contribution to the cross section for $pp\to d\pi^+$ close to the
experimental value.


title: Study on N Omega-bar systems in a chiral quark model

abstract:
  The N Omega-bar systems with spin S=1 and S=2 are dynamically investigated
within the framework of the chiral SU(3) quark model and the extended chiral
SU(3) quark model by solving the resonating group method (RGM) equation. The
model parameters are taken from our previous work, which gave a good
description of the energies of the baryon ground states, the binding energy of
deuteron, and the experimental data of the nucleon-nucleon (NN) and
nucleon-hyperon (NY) scattering processes. The results show that N Omega-bar
states with spin S=1 and S=2 can be bound both in the chiral SU(3) and extended
chiral SU(3) quark models, and the binding energies are about 28-59 MeV. When
the annihilation effect is considered, the binding energies increase to about
37-130 MeV, which indicates the annihilation effect plays a relatively
important role in forming an N Omega-bar bound state. At the same time, the N
Omega-bar elastic scattering processes are also studied. The S, P, D partial
wave phase shifts and the total cross sections of S=1 and S=2 channels have
been calculated by solving the RGM equation for scattering problems.


title:
Microscopic Description of Nuclear Wobbling Motion -- Rotation of
  traxially deformed nuclei --

abstract:
  The nuclear wobbling motion in the Lu region is studied by the microscopic
cranked mean-field plus RPA method. The Woods-Saxon potential is used as a
mean-field with a new parameterization which gives reliable description of
rapidly rotating nuclei. The prescription of symmetry-preserving residual
interaction makes the calculation of the RPA step parameter-free, and we find
the wobbling-like RPA solution if the triaxial deformation of the mean-field is
suitably chosen. It is shown that the calculated out-of-band $B(E2)$ of the
wobbling-like solution depends on the triaxial deformation in the same way as
in the macroscopic rotor model, and can be used to probe the triaxiality of the
nuclear mean-field.


title: Space-time evolution of hadronization

abstract:
  Beside its intrinsic interest for the insights it can give into color
confinement, knowledge of the space-time evolution of hadronization is very
important for correctly interpreting jet-quenching data in heavy ion collisions
and extracting the properties of the produced medium. On the experimental side,
the cleanest environment to study the space-time evolution of hadronization is
semi-inclusive Deeply Inelastic Scattering on nuclear targets. On the
theoretical side, 2 frameworks are presently competing to explain the observed
attenuation of hadron production: quark energy loss (with hadron formation
outside the nucleus) and nuclear absorption (with hadronization starting inside
the nucleus). I discuss recent observables and ideas which will help to
distinguish these 2 mechanisms and to measure the time scales of the
hadronization process.


title: Some thoughts on critical and tricritical points and deconfinement

abstract:
  We start with a discussion of a phase diagram and three special collision
energies: (i) the first touching of the mixed phase; (ii) the softest point;
(iii) the critical point. We then proceed to more details about the role a
massless critical mode should play in the particle interaction and the elliptic
flow. We then enter a discussion of whether high density QGP is or is not
strongly coupled, and if so what one can say about color superconductivity
domain using universality and data on trapped ultracold fermionic atoms. At the
end, we briefly discuss deconfinement, or more specifically on whether there
are precursors of the QCD strings at $T>T_c$, as well as possible role of
magnetically charged excitations (monopoles and dyons).


title: Quark Matter in QC(2)D

abstract:
  Results are presented from a numerical study of lattice QCD with gauge group
SU(2) and two flavors of Wilson fermion at non-zero quark chemical potential mu
>> T. Studies of the equation of state, the superfluid condensate, and the
Polyakov line all suggest that in addition to the low density phase of
Bose-condensed diquark baryons, there is a deconfined phase at higher quark
density in which quarks form a degenerate system, whose Fermi surface is only
mildly disrupted by Cooper pair condensation.


title: The conical flow from quenched jets in sQGP

abstract:
  Starting with a reminder of what is strongly coupled Quark-Gluon Plasma
(sQGP), we proceed to recent advances in jet quenching and heavy quark
diffusion, with a brief summary of various results based on AdS/CFT
correspondence. The conical flow is a hydrodynamical phenomenon created by
energy and entropy deposited by high energy jets propagating in matter, similar
in nature to well known sonic boom from the supersonic planes. After a brief
review, we discuss excitations of two hydro modes -- sound and ``diffuson'' --
which can be excited in this way. We also study expanding matter case, with a
variable sped of sound, and use adiabatic invariants to show that the parameter
$v/T$ ($v$ velocity in the wave, $T$ temperature) is increasing, up to a factor
3, during expansion. At the end we discuss recent results of the Princeton
group which derived conical flow from AdS/CFT.


title: Strangeness contributions to nucleon form factors

abstract:
  We review a recent theoretical determination of the strange quark content of
the electromagnetic form factors of the nucleon. These are compared with a
global analysis of current experimental measurements in parity-violating
electron scattering.