title: Elliptic Flow and HBT in non-central Nuclear Collisions

abstract:
  Elliptic flow and HBT are studied for non-central relativistic nuclear
collisions. Azimuthal asymmetries show up in both elliptic flow and HBT radii
and are calculated in both collisionless and hydrodynamic limits relevant for
peripheral and central collisions respectively. Determining the reaction plane
and measuring the HBT radii as function of the angle between the reaction plane
and the particle momenta can determine the physical quantities as source sizes,
deformations, emission times, duration of emission and opacities. Comparison to
SPS data and predictions for RHIC and LHC energies are given. The centrality
dependence with and without a phase transition to a quark-gluon plasma is
discussed - in particular, how the physical quantities are expected to display
a qualitative different behavior in case of a phase transition.


title: A Relativistic Symmetry in Nuclei

abstract:
  We review the status of a quasi - degenerate doublets in nuclei, called
pseudospin doublets, which were discovered about thirty years ago and the
origins of which have remained a mystery, until recently. We show that
pseudospin doublets originate from an SU(2) symmetry of the Dirac Hamiltonian
which occurs when the scalar and vector potentials are opposite in sign but
equal in magnitude. Furthermore, we survey the evidence that pseudospin
symmetry is approximately conserved for a Dirac Hamiltonian with realistic
scalar and vector potentials. We briefly discuss the relationship of pseudospin
symmetry with chiral symmetry and the implications of pseudospin symmetry for
the antinucleon spectrum in nuclei.


title: Superallowed Fermi beta decay and Coulomb mixing in nuclei

abstract:
  Superallowed $0^+ \to 0^+$ nuclear beta decay provides a direct measure of
the weak vector coupling constant, $\GV$. We survey current world data on the
nine accurately determined transitions of this type, which range from the decay
of $^{10}$C to that of $^{54}$Co, and demonstrate that the results confirm
conservation of the weak vector current (CVC) but differ at the 98% confidence
level from the unitarity condition for the Cabibbo-Kobayashi-Maskawa (CKM)
matrix. We examine the reliability of the small calculated corrections that
have been applied to the data, and conclude that there are no evident defects
although the Coulomb correction, $\delta_C$, depends sensitively on nuclear
structure and thus needs to be constrained independently. The potential
importance of a result in disagreement with unitarity, clearly indicates the
need for further work to confirm or deny the discrepancy. We examine the
options and recommend priorities for new experiments and improved calculations.
Some of the required experiments depend upon the availability of intense
radioactive beams. Others are possible with existing facilities.


title: Rigidity and Normal Modes in Random Matrix Spectra

abstract:
  We consider the Gaussian ensembles of random matrices and describe the normal
modes of the eigenvalue spectrum, i.e., the correlated fluctuations of
eigenvalues about their most probable values. The associated normal mode
spectrum is linear, and for large matrices, the normal modes are found to be
Chebyshev polynomials of the second kind. We contrast this with the behaviour
of a sequence of uncorrelated levels, which has a quadratic normal mode
spectrum. The difference in the rigidity of random matrix spectra and sequences
of uncorrelated levels can be attributed to this difference in the normal mode
spectra. We illustrate this by calculating the number variance in the two
cases.


title: MARS Code Developments

abstract:
  Recent developments in the physical model of 1 MeV to 100 TeV hadron and
lepton interactions with nuclei and atoms are described. These include a new
nuclear cross section library, a model for soft pion production, the
cascade-exciton model, the dual parton model, deuteron-nucleus and
neutrino-nucleus interaction models, detailed description of muon, pion, and
antiproton absorption and a unified treatment of muon and charged hadron
electromagnetic interactions with matter. New algorithms are implemented into
the MARS13(98)} Monte Carlo code and benchmarked against experimental data. The
code capabilities to simulate cascades and generate a variety of results in
complex media have been also enhanced.


title:
Geometric Parameterization of $J/\Psi$ Absorption in Heavy Ion
  Collisions

abstract:
  We calculate the survival probability of $J/\Psi$ particles in various
colliding systems using a Glauber model. An analysis of recent data has
reported a $J/\Psi$-nucleon breakup cross section of 6.2$\pm$0.7 mb derived
from an exponential fit to the ratio of $J/\Psi$ to Drell-Yan yields as a
function of a simple, linearly-averaged mean path length through the nuclear
medium. Our calculations indicate that, due to the nature of the calculation,
this approach yields an apparent breakup cross section which is systematically
lower than the actual value.


title: Time-scale of breakup of the halo nucleus 11Be

abstract:
  We investigate the post-acceleration of the $^{10}$Be fragment in Coulomb
breakup reaction of the halo nucleus $^{11}$Be, assuming that the excitation of
the projectile is to states in the low energy continuum. The method used
retains all finite-range effects associated with the interactions between the
breakup fragments and can use realistic wave functions for the halo nuclei. We
apply the method to compute the average momenta of the $^{10}$Be fragment at
four different scattering angles following breakup of $^{11}$Be on a Au target
at 42 MeV/nucleon beam energy. Our results, which are in qualitative agreement
with recent precision experimental data, are consistent with the picture of no
post-acceleration effect. The implication is that the breakup takes place on a
time-scale long compared to the collision time.


title:
Study of the Possibility of Supernarrow Dibaryon Production in the
  \vec\gamma d-> \pi^{\pm} +D Reaction

abstract:
  The possibility of observation of supernarrow dibaryons, decay of which into
two nucleons forbidden by the Pauli principle, produced in processes of charged
pion photoproduction by polarized photons from the deuteron is analyzed. It is
shown that the expectable dibaryon yield may exceed the background by a factor
of 10--100.


title: Neutron-Proton Interaction in Doubly Odd Deformed Nuclei

abstract:
  In this paper, we present some results of a particle-rotor model study of
176Lu. In particular, we consider the two lowest K=1+ balds, which present a
rather large odd-even staggering. This effect, which may be traced to direct
Coriolis coupling with Newby-shifted K=0+ bands, is of great interest since it
gives information on the proton-neutron interaction. We use both zero-range and
finite-range interactions with particular attention focused on the role of the
tensor force. Comparison of the calculated results with experimental data
evidences the importance of the tensor-force effects in the description of the
odd-even staggering in K not-equal-to zero bands.


title: Propagation of a massive spin-3/2 particle

abstract:
  The propagation of an off-shell spin-3/2 baryon is investigated in a
consistent framework using projections corresponding to one irreducible
spin-3/2 and two irreducible spin-1/2 representations arising from the usual
spinor-vector representation of the spin-3/2 fields. Starting from the most
general Lagrangian invariant under point transformations containing first-order
derivatives only and imposing the constraint $\gamma_\mu \psi^\mu=0$, we
eliminate one of the spin-1/2 contributions. The resulting propagator provides
a clean separation of spin-3/2 proper and the one remaining spin-1/2
contribution. In addition to a conventional pole term describing pure spin-3/2,
which is identical to the propagator proposed by Williams, this procedure
yields a second pole term describing spin-1/2 only, with a pole at twice the
mass parameter of the Lagrangian. Its effect on physical observables may
manifest itself in a manner which is indistinguishable from a particle in its
own right. The second pole term cancels the $1/p^2$ singularity of the Williams
propagator and the propagator derived here is well behaved for vanishing $p^2$.


title: Shell Model Monte Carlo Investigation of Rare Earth Nuclei

abstract:
  We utilize the Shell Model Monte Carlo (SMMC) method to study the structure
of rare earth nuclei. This work demonstrates the first systematic ``full
oscillator shell plus intruder'' calculations in such heavy nuclei. Exact
solutions of a pairing plus quadrupole hamiltonian are compared with mean field
and SPA approximations in several Dysprosium isotopes from A=152-162, including
the odd mass A=153. Basic properties of these nuclei at various temperatures
and spin are explored. These include energy, deformation, moments of inertia,
pairing channel strengths, band crossing, and evolution of shell model
occupation numbers. Exact level densities are also calculated and, in the case
of 162 Dy, compared with experimental data.


title:
Final state interaction effects in mu-capture induced two-body decay of
  3He

abstract:
  The mu-capture process on 3He leading to a neutron, a deuteron and a
mu-neutrino in the final state is studied. Three-nucleon Faddeev wave functions
for the initial 3He bound and the final neutron-deuteron scattering states are
calculated using the BonnB and Paris nucleon-nucleon potentials. The nuclear
weak current operator is restricted to impulse approximation. Large effects on
the decay rates of the final state interaction are found. The comparison to
recent experimental data shows that the inclusion of final state interactions
drastically improves the description of the data.


title: Realistic Shell-Model Calculations for 208Pb Neighbors

abstract:
  We have performed a shell-model study of the two nuclei 210Po and 206Hg,
having and lacking two protons with respect to doubly magic 208Pb. In our
calculations we have employed realistic effective interactions derived from the
Bonn A nucleon-nucleon potential. The calculated results are compared with the
available experimental data are, however, very scanty for 206Hg. The very good
agreement obtained for 210Po supports confidence in our predictions for 206Hg.


title: Photoinduced Two-Nucleon Knockout: A Kinematical Study in Nuclear Matter

abstract:
  The contributions of short-range nucleon-nucleon correlations, meson exchange
current (MEC) corrections and the influence of Delta isobar excitations
(isobaric currents, IC) on photon induced two-nucleon knockout reactions are
investigated. The nuclear structure functions are evaluated for the system of
infinite nuclear matter. This allows a systematic investigation of the relative
importance of the various contributions (MEC, IC and correlations) in different
kinematical regions. Nucleon-nucleon (NN) correlations derived from a realistic
NN interaction by solving the Bethe-Goldstone equation yield significant
changes in the structure functions W_L and W_T of the (e,e'pn) and (e,e'pp)
reactions. This is true in particular for the so-called 'super parallel'
kinematics at momentum transfers which can be measured e.g. at MAMI in Mainz.


title:
Effective Lagrangian Study of $\gamma p \to K^+ \Lambda$ (spin 3/2
  resonances and their off-shell effects)

abstract:
  The purpose of the present discussion is to supplement the talk, by B.~Saghai
at this workshop, on the study of the electromagnetic production of strangeness
on the nucleon based upon effective Lagrangian methods. Here we focus on the
proper treatment of the spin 3/2 resonances and their associated effects due to
the spin 1/2 component of the corresponding fields when they are {\it off the
mass shell}.


title: Effect of In-Medium Meson Masses on Nuclear Matter Properties

abstract:
  Masses of hadrons (baryons as well as mesons) are modified in the nuclear
medium because of their interactions. In this paper we investigate the effect
of in-medium meson masses on the properties of the nuclear matter. The
calculations are performed in the Walecka model. We find that with the
inclusion of meson mass modification, the computed equation of state becomes
softer. We also find that the decrease in the nucleon as well as meson masses
in the medium is smaller than that obtained in the case when the in-medium
meson masses are not taken into account.


title:
Analysis of flow effects in relativistic heavy-ion collisions within the
  CBUU approach

abstract:
  We study flow phenomena in relativistic heavy-ion collisions, both in
transverse and radial direction, in comparison to experimental data. The
collective dynamics of the nucleus-nucleus collision is described within a
transport model of the coupled channel BUU type (CBUU). This recently developed
version includes all nucleonic resonances up to 1.95 GeV in mass and mean-field
potentials both of the Skyrme and momentum dependent MDYI type. We find that
heavy resonances play an important role in the description of transverse flow
above 1 AGeV incident energy. For radial flow we analyse reaction times and
equilibration and extract the parameters $T$ and $\beta$ for temperature and
collective flow velocity within different prescriptions. Furthermore, we apply
a coalescence model for fragment production and check the mass dependence of
the flow signals.


title: Triaxial projected shell model approach

abstract:
  The projected shell model analysis is carried out using the triaxial
Nilsson+BCS basis. It is demonstrated that, for an accurate description of the
moments of inertia in the transitional region, it is necessary to take the
triaxiality into account and perform the three-dimensional angular-momentum
projection from the triaxial Nilsson+BCS intrinsic wavefunction.


title:
Density and expansion effects on pion spectra in relativistic heavy-ion
  collisions

abstract:
  We compute the pion inclusive momentum distribution in heavy-ion collisions
at AGS energies, assuming thermal equilibrium and accounting for density and
expansion effects at the time of decoupling. We compare to data on mid rapidity
charged pions produced in central Au + Au collisions and find a very good
agreement. The shape of the distribution at low $m_t-m$ is explained in part as
an effect arising from the high mean pion density achieved in these reactions.
The difference between the positive and negative pion distributions in the same
region is attributed in part to the different average yields of each kind of
charged pions.


title: Hadronic Vacuum Polarization and the Lamb Shift

abstract:
  Recent improvements in the determination of the running of the fine-structure
constant also allow an update of the hadronic vacuum-polarization contribution
to the Lamb shift. We find a shift of -3.40(7) kHz to the 1S level of hydrogen.
We also comment on the contribution of this effect to the determination by
elastic electron scattering of the r.m.s. radii of nuclei.


title: Roper excitation in $\vec{p}+\alpha \to \vec{p}+\alpha+X$ reactions

abstract:
  We calculate differential cross sections and the spin transfer coefficient
$D_{nn}$ in the $\vec{p}+\alpha \to \vec{p}+\alpha+\pi^0$ reaction for proton
bombarding energies from 1 to 10 GeV and $\pi^0 - p$ invariant masses spanning
the region of the N$^*$(1440) Roper resonance. Two processes -- $\Delta$
excitation in the $\alpha$-particle and Roper excitation in the proton -- are
included in an effective reaction model which was shown previously to reproduce
existing inclusive spectra. The present calculations demonstrate that these two
contributions can be clearly distinguished via $D_{nn}$, even under kinematic
conditions where cross sections alone exhibit no clear peak structure due to
the excitation of the Roper.


title: Photoproduction of the Lambda(1405) on the proton and nuclei

abstract:
  We study the gamma p ---> K^+ Lambda(1405) reaction at energies close to
threshold using a chiral unitary model where the resonance is generated
dynamically from K^-p interaction with other channels constructed from the
octets of baryons and mesons. Predictions are made for cross sections into
several channels and it is shown that the detection of the K^+ is sufficient to
determine the shape and strength of the Lambda(1405) resonance. The
determination of the resonance properties in nuclei requires instead the
detection of the resonance decay channels. Pauli blocking effects on the
resonance, which have been shown to be very important for the resonance at rest
in the nucleus, are irrelevant here where the resonance is produced with a
large momentum. The nuclear modifications here would thus offer information on
the resonance and K^- nucleus dynamics complementary to the one offered so far
by K^- atoms.


title: J/psi Production and Absorption in High Energy Proton-Nucleus Collisions

abstract:
  Measured J/Psi production cross sections for 200 and 450 GeV/c protons
incident on a variety of nuclear targets are analyzed within a Glauber
framework which takes into account energy loss of the beam proton, the time
delay of particle production due to quantum coherence, and absorption of the
J/Psi on nucleons. The best representation is obtained for a coherence time of
0.5 fm/c, previously determined by Drell-Yan production in proton-nucleus
collisions, and an absorption cross section of 3.6 mb, which is consistent with
the value deduced from photoproduction of the J/Psi on nuclear targets.


title:
Highly Sensitive Centrality Dependence of Elliptic Flow -- A Novel
  Signature of the Phase Transition in QCD

abstract:
  Elliptic flow of the hot, dense system which has been created in
nucleus-nucleus collisions develops as a response to the initial azimuthal
asymmetry of the reaction region. Here it is suggested that the magnitude of
this response shows a ``kinky'' dependence on the centrality of collisions for
which the system passes through a first-order or rapid transition between
quark-gluon plasma and hadronic matter. We have studied the system Pb(158AGeV)
on Pb employing a recent version of the transport theoretical approach RQMD and
find the conjecture confirmed. The novel phase transition signature may be
observable in present and forthcoming experiments at CERN-SPS and at RHIC, the
BNL collider.


title:
The role of trapped neutrino in dense stelllar matter and kaon
  condensation

abstract:
  We investigate the effect of neutrino trapping on kaon condensation process
and Equation of State (EOS) in a newly formed neutron star which is less than
several seconds old. Using nonlinear relativistic mean field model, we find
that the presence of neutrino shifts the threshold for kaon condensation and
muon production to much higher density. We also studied the energy density and
pressure of the syst under trapped neutrino condition and found that it
stiffens the EOS of the system which may be responsible for the delayed
exploision mechanism of supernovae.


title: Rho Meson Broadening in Hot and Dense Hadronic Matter

abstract:
  The modification of the width of rho mesons due to in-medium decays and
collisions is evaluated. The decay width is calculated from the imaginary part
of the one-loop self-energy at finite temperature. The collision width is
related to the cross sections of the $\rho$ + pion and the $\rho$ + nucleon
reactions. A calculation based on an effective Lagrangian shows the importance
of including the direct $\rho\pi\to\rho\pi$ scattering which is dominated by
the $a_1$ exchange. A large broadening of the spectral function is found,
accompanied by a strength suppression at the pole.


title:
Relativistic Calculation of Polarization Observables in NN -> D\pi
  Processes

abstract:
  A detailed analysis of processes of the type NN -> d\pi is presented taking
into account the exchange graphs of a nucleon and a pion. A large sensitivity
of polarization observables to the off-mass shell effects of nucleons inside
the deuteron is shown. The influence of the inclusion of the P-wave in the
deuteron wave function (DWF) is studied. We have analyzed the sensitivity of
all the observables to the form of \pi NN - current taking into account the
off-shellnis of the nucleon and the choice of the DWF relativistic form. From
the results one can see the very large sensitivity of all the observables,
especially of the polarization characteristics to the choice of the DWF form.


title:
Lessons to be learned from the coherent photoproduction of pseudoscalar
  mesons

abstract:
  We study the coherent photoproduction of pseudoscalar mesons---particularly
of neutral pions---placing special emphasis on the various sources that put
into question earlier nonrelativistic-impulse-approximation calculations. These
include: final-state interactions, relativistic effects, off-shell ambiguities,
and violations to the impulse approximation. We establish that, while
distortions play an essential role in the modification of the coherent cross
section, the uncertainty in our results due to the various choices of
optical-potential models is relatively small (of at most 30%). By far the
largest uncertainty emerges from the ambiguity in extending the many
on-shell-equivalent representations of the elementary amplitude off the mass
shell. Indeed, relativistic impulse-approximation calculations that include the
same pionic distortions, the same nuclear-structure model, and two sets of
elementary amplitudes that are identical on-shell, lead to variations in the
magnitude of the coherent cross section by up to factors of five. Finally, we
address qualitatively the assumption of locality implicit in most
impulse-approximation treatments, and suggest that the coherent reaction
probes---in addition to the nuclear density---the polarization structure of the
nucleus.


title: Four-nucleon shell-model calculations in a Faddeev-like approach

abstract:
  We use equations for Faddeev amplitudes to solve the shell-model problem for
four nucleons in the model space that includes up to 14 hbar Omega
harmonic-oscillator excitations above the unperturbed ground state. Two- and
three-body effective interactions derived from the Reid93 and Argonne V8'
nucleon-nucleon potentials are used in the calculations. Binding energies,
excitations energies, point-nucleon radii and electromagnetic and strangeness
charge form factors for 4He are studied. The structure of the Faddeev-like
equations is discussed and a formula for matrix elements of the permutation
operators in a harmonic-oscillator basis is given. The dependence on
harmonic-oscillator excitations allowed in the model space and on the
harmonic-oscillator frequency is investigated. It is demonstrated that the use
of the three-body effective interactions improves the convergence of the
results.


title: Survey of heavy-meson observables

abstract:
  We employ a Dyson-Schwinger equation model to effect a unified and uniformly
accurate description of light- and heavy-meson observables, which we
characterise by heavy-meson leptonic decays, semileptonic heavy-to-heavy and
heavy-to-light transitions - B -> D*, D, rho, pi; D -> K*, K, pi, radiative and
strong decays - B(s)* -> B(s) gamma; D(s)* -> D(s) gamma, D pi, and the rare
B-> K* gamma flavour-changing neutral-current process. We elucidate the
heavy-quark limit of these processes and, using a model-independent mass
formula valid for all nonsinglet pseudoscalar mesons, demonstrate that their
mass rises linearly with the mass of their heaviest constituent. In our
numerical calculations we eschew a heavy-quark expansion and rely instead on
the observation that the dressed c,b-quark mass functions are well approximated
by a constant, interpreted as their constituent-mass: we find M_c=1.32 GeV and
M_b=4.65 GeV. The calculated heavy-meson leptonic decay constants and
transition form factors are a necessary element in the experimental
determination of CKM matrix elements. The results also show that this
framework, as employed hitherto, is well able to describe vector meson
polarisation observables.


title: Pion Exchange Effects in Elastic Backward Proton-Deuteron Scattering

abstract:
  The elastic backward proton-deuteron scattering is analyzed within a
covariant approach based on the Bethe-Salpeter equation with realistic
meson-exchange interaction. Contributions of the one-nucleon and one-pion
exchange mechanisms to the cross section and polarization observables are
investigated in explicit form. Results of numerical calculations for the cross
section, tensor analyzing power and spin transfers are presented. The one-pion
exchange contribution is essential for describing the spin averaged cross
section, while in polarization observables it is found to be less important.


title: Coulomb breakup of drip-liners

abstract:
  We show how to derive nuclear structure information on loosely bound nuclei
far from the beta stability line from their Coulomb dissociation into the
continuum. The 19C -> 18C + n process is taken as an example and it is shown
that basic properties such as ground-state spin and parity and the neutron
binding energy of the halo nucleus 19C can be derived from a comparison of
theoretical calculations to experimental data.


title: Real Time Dynamics of Colliding Gauge Fields and the ''Glue Burst''

abstract:
  The Yang Mills equations provide a classical mean field description of gauge
fields. In view of developing a coherent description of the formation of the
quark gluon plasma in high energetic nucleus-nucleus collisions we study pure
gauge field dynamics in 3+1 dimensions. In collisions of wave packets,
numerically simulated on a SU(2) gauge lattice, we study transverse and
longitudinal energy currents. For wave packets with different polarizations in
color space, we observe a time delayed fragmentation after the collision
resulting in a rapid expansion into transverse directions. We call this
phenomenon the ''glue burst''. An analysis of the Yang Mills equations reveals
the explanation for this behavior. We point out that this effect could play a
role in ultra-relativistic heavy-ion collisions.


title: Hadrons in the Nuclear Medium

abstract:
  In this talk I first discuss predictions based on QCD sum rules and on
hadronic models for the properties of vector mesons in the nuclear medium. I
then describe possible experimental signatures and show detailed predictions
for dilepton invariant mass spectra with a special emphasis on nuclear
reactions involving elementary incoming beams and nuclear targets. I will in
particular illustrate that the sensitivity of pion and photon induced reactions
to in-medium effects is nearly as large as that of heavy-ion reactions.


title:
Effective Baryon-Baryon Potentials in the Quark Delocalization and Color
  Screening Model

abstract:
  The quark delocalization and color screening model is used for a systematic
study of the effective potential between baryons in the u,d and s sector. The
model is constrained by the properties of baryons and N-N scattering. The
effective potentials for the N-N (IJ=01,10,11,00) channels and the N-Lambda and
N-Sigma (IJ = (1/2)1, (1/2)0, (3/2)1, (3/2)0) channels fit the N-N, N-Lambda
and N-Sigma scattering data reasonably well. This model predicts: There are
rather strong effective attractions between decuplet-baryons; the effective
attractions between octet-baryons are weak or even repulsive; and the
attractions between decuplet- and octet-baryons lie in between.


title: Improved Cascade-Exciton Model of Nuclear Reactions

abstract:
  Recent improvements to the Cascade-Exciton Model (CEM) of nuclear reactions
are briefly described. They concern mainly the cascade stage of reactions and a
better description of nuclei during the preequilibrium and evaporation stages
of reactions. The development of the CEM concerning fission is given in a
separate talk at this conference. The increased accuracy and predictive power
of the CEM are shown by several examples. Possible further improvements to the
CEM and other models are discussed.


title: Modeling Fission in the Cascade-Exciton Model

abstract:
  Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions
to describe high energy particle induced fission are briefly described. The
increased accuracy and predictive power of the CEM are shown by several
examples. Further necessary work is outlined.


title:
Production and Validation of Isotope Production Cross Section Libraries
  for Neutrons and Protons to 1.7 GeV

abstract:
  For validation and development of codes and for modeling isotope production
in high power accelerators and APT Materials studies, we have produced
experimental, calculated, and evaluated activation libraries for interaction of
nucleons with nuclides covering about a third of all natural elements. For
targets considered here, our compilation of experimental data is the most
complete we are aware of, since it contains all data available on the Web, in
journal papers, laboratory reports, theses, and books, as well as all data
included in the large compilation by Sobolevsky with co-authors (NUCLEX)
published recently by Springer-Verlag in 4 volumes. Our evaluated library was
produced using all available experimental cross sections together with
calculations by the CEM95, LAHET, and HMS-ALICE codes and with the European
Activation File EAF-97 and LANL Update II of the ECNAF Neutron Activation
Cross-Section Library.


title: Spin observables in the $pn \to p \Lambda$ reaction

abstract:
  The T matrix of the LambdaN-> NN reaction, which is a strangeness changing
weak process, is derived. The explicit formulas of the spin observables are
given for s-wave p-Lambda final states which kinematically corresponds to
inverse reaction of the weak nonmesonic decay of Lambda hypernuclei. One can
study interferences between amplitudes of parity- conserving and violating,
spin- singlet and triplet and isospin- singlet and triplet. Most of them are
not available in the study of the nonmesonic decay. They clarify structure of
the reaction and constrain strongly theoretical models for weak hyperon nucleon
interaction.


title: Theoretical Issues in Neutrino Physics

abstract:
  I review a number of the open questions about neutrino properties, critique
recent hints of neutrino mass, and discuss one recently proposed neutrino mass
matrix to illustrate the direction in which we may be headed. I also present
one example of the implications of these new developments for astrophysics.


title: An isotopic effect in phi photoproduction at a few GeV

abstract:
  A distinct isotopic effect in phi photoproduction at 2-5 GeV region is
identified by examining the production amplitudes due to Pomeron-exchange and
meson-exchange mechanisms. This effect is mainly caused by the pi-eta
interference constrained by SU(3) symmetry and the isotopic structure of the
gamma NN coupling in the direct phi-radiation amplitude. It can be tested
experimentally by measuring differences in the polarization observables between
the gamma-p and gamma-n reactions.


title:
Extraction of bounds on time-reversal non-invariance from neutron
  reactions

abstract:
  Ratios involving on-resonance measurements of the three-fold and five-fold
correlation cross sections for which the dependence on some of the unknown
spectroscopic data is eliminated are considered. Closed form expressions are
derived for the statistical distributions of these ratios. Implications for
bounds on the variance of matrix elements of time reversal non-invariant
nucleon-nucleon interactions are considered within a Bayesian framework and the
competitiveness with bounds from other experiments is evaluated. The prospects
for null five-fold correlation measurements improving by an order of magnitude
or more upon the current bound on a parity-conserving T-odd interaction are
good.


title: Quantum M\"{u}nchhausen effect in tunneling

abstract:
  It is demonstrated that radiative corrections increase tunneling probability
of a charged particle.

categories: nucl-th cond-mat.mes-hall cond-mat.supr-con hep-th physics.atom-ph quant-ph


title:
Two-photon processes in two-nucleon systems as a tool of searching for
  exotic six-quark resonances

abstract:
  The reaction $pp \to pp2\gamma$, proposed earlier to probe for the
NN--decoupled dibaryon resonances, has been studied by the DIB$2\gamma$
Collaboration (JINR) and their preliminary data seem to give evidence for the
resonance effect at about 1920 MeV. We discuss some other two-photon processes:
the double radiative capture reaction in pionic deuterium, photoabsorption sum
rules and the nuclear Compton scattering, which we consider to be especially
feasible for further test and invesigation of possible low-lying, exotic
six-quark states.


title: Nuclear y and x scaling

abstract:
  The basic approximations leading to non-relativistic and relativistic nuclear
y and x scaling are recalled. The general and systematic features of y-scaling
structure functions are pointed out, and a recently proposed novel approach to
y-scaling, based on a global scaling variable, y_G, which incorporates the
effect of the momentum dependence of the nucleon removal energy, and therefore
allows the establishment of a direct link between scaling functions and
momentum distributions, is illustrated and applied to the analysis of a large
body of data. The phenomenon of nuclear x-scaling, based on a proper analysis
of nuclear quasi-elastic data in terms of the Bjorken scaling variable x_B, is
shown to occur at high values of the four-momentum transfer Q^2; the usefulness
of nuclear x scaling is pointed out.


title:
Quark Delocalization, Color Screening Model and Nucleon-Baryon
  Scattering

abstract:
  We apply the quark delocalization and color screening model to nucleon-baryon
scattering. A semi-quantitative fit to N-N, N-Lambda and N-Sigma phase shifts
and scattering cross sections is obtained without invoking meson exchange.
Quarks delocalize reasonably in all of the different flavor channels to induce
effective nucleon-baryon interactions with both a repulsive core and with an
intermediate range attraction in the cases expected.


title: Fundamental Symmetries and Theory

abstract:
  Nuclei are powerful laboratories for studying fundamental symmetries because
they filter and enhance specific interactions. I discuss four examples ---
hadronic parity violation, atomic electric dipole moments, precision $\beta$
decay tests, and nuclear tests of neutrino masses --- to illustrate some of the
progress that has been made in the past few years.


title:
Gauging of equations method. I. Electromagnetic currents of three
  distinguishable particles

abstract:
  We present a general method for incorporating an external electromagnetic
field into descriptions of few-body systems whose strong interactions are
described by integral equations. In particular, we address the case where the
integral equations are those of quantum field theory and effectively sum up an
infinite number of Feynman diagrams. The method involves the idea of gauging
the integral equations themselves, and results in electromagnetic amplitudes
where an external photon is effectively coupled to every part of every strong
interaction diagram in the model. Current conservation is therefore implemented
in the way prescribed by quantum field theory. We apply our gauging procedure
to the four-dimensional integral equations describing a system of three
distinguishable relativistic particles. In this way we obtain the expressions
needed to calculate all possible electromagnetic processes of the three-body
system. An interesting aspect of our results is the natural appearance of a
subtraction term needed to avoid the overcounting of diagrams.


title:
Gauging of equations method. II. Electromagnetic currents of three
  identical particles

abstract:
  The gauging of equations method, introduced in the preceding paper, is
applied to the four-dimensional integral equations describing the strong
interactions of three identical relativistic particles. In this way we obtain
gauge invariant expressions for all possible electromagnetic transition
currents of the identical three-particle system. In the three-nucleon system
with no isospin violation, for example, our expressions describe the
electromagnetic form factors of ^3H, pd->pd gamma, gamma ^3He-> pd, gamma
^3He-> ppn, etc. A feature of our approach is that gauge invariance is achieved
through the coupling of the photon to all possible places in the
(nonperturbative) strong interaction model. Moreover, once the proper identical
particle symmetry is incorporated into the integral eqations describing the
strong interactions, the gauging procedure automatically provides
electromagnetic transition currents with the proper symmetry. In this way the
gauging of equations method results in a unified description of strong and
electromagnetic interaction of strongly interacting systems.


title: Effective Field Theory for Nuclear Physics

abstract:
  I summarize the motivation for the effective field theory approach to nuclear
physics, and highlight some of its recent accomplishments. The results are
compared with those computed in potential models.


title: Anisotropic $J/\Psi$ suppression in nuclear collisions

abstract:
  The nuclear overlap zone in non-central relativistic heavy ion collisions is
azimuthally very asymmetric. By varying the angle between the axes of
deformation and the transverse direction of the pair momenta, the suppression
of $J/\Psi$ and $\Psi'$ will oscillate in a characteristic way. Whereas the
average suppression is mostly sensitive to the early and high density stages of
the collision, the amplitude is more sensitive to the late stages. This effect
provides additional information on the $J/\Psi$ suppression mechanisms such as
direct absorption on participating nucleons, comover absorption or formation of
a quark-gluon plasma. The behavior of the average $J/\Psi$ suppression and its
amplitude with centrality of the collisions is discussed for SPS, RHIC and LHC
energies with and without a phase transition.


title:
Study of correlation of production and decay planes in $\pi\to3\pi$
  diffractive dissociation process on nuclei

abstract:
  A large correlation of production and decay planes of
(\pi^-\pi^+\pi^-)-system in dissociation of $\pi^-$-beam 40 GeV/c on nuclear
targets was observed. The dependence of the correlation on atomic number,
Feynmann variable and transversal momentum as well as on invariant mass of the
pion triple and neutral pion pair were investigated. It was shown that the
phenomenon has a clear dynamic origin and resembles the single spin asymmetry
behavior.


title: Potentials and Limits of Bose-Einstein Interferometry

abstract:
  We complete the introduction of Yano-Koonin-Podgoretskii (YKP)
parametrization of the correlation function by deriving the corrections to the
correlation radii which arise from releasing the popular smoothness
approximation and approximation of setting the pair momentum on-shell. We
investigate the definition range of this parametrization and find kinematic
regions in which the YKP parametrization is inapplicable. These problems
disappear if the newly proposed Modified Yano-Koonin-Podgoretskii
parametrization is used. We then focus on the physical interpretation of the
correlation radii obtained in the different parametrizations. While the
extraction of the longitudinal source expansion from the YK rapidity is found
to be rather robust against variations of the source density profiles, the
extracted emission duration is quite sensitive to such variations and cannot be
reliably extracted except for the case of extremely long source lifetimes.


title: proton-deuteron elastic scattering above the deuteron breakup

abstract:
  The complex Kohn variational principle and the (correlated) hyperspherical
harmonics method are applied to study the proton-deuteron elastic scattering at
energies above the deuteron breakup threshold. Results for the elastic cross
section and various elastic polarization observables have been obtained by
fully taking into account the long-range effect of the Coulomb interaction and
using a realistic nucleon-nucleon interaction model. Detailed comparison
between the theoretical predictions and the accurate and abundant
proton-deuteron experimental data can now be performed.


title: Three-body Faddeev Calculation for 11Li with Separable Potentials

abstract:
  The halo nucleus $^{11}$Li is treated as a three-body system consisting of an
inert core of $^{9}$Li plus two valence neutrons. The Faddeev equations are
solved using separable potentials to describe the two-body interactions,
corresponding in the n-$^{9}$Li subsystem to a p$_{1/2}$ resonance plus a
virtual s-wave state. The experimental $^{11}$Li energy is taken as input and
the $^{9}$Li transverse momentum distribution in $^{11}$Li is studied.


title: Anti-Hyperon Enhancement through Baryon Junction Loops

abstract:
  The baryon junction exchange mechanism recently proposed to explain valence
baryon number transport in nuclear collisions is extended to study midrapidity
anti-hyperon production. Baryon junction-anti-junction (J anti-J) loops are
shown to enhance anti-Lambda, anti-Xi, anti-Omega yields as well as lead to
long range rapidity correlations. Results are compared to recent WA97 Pb + Pb
-> Y + anti-Y + X data.


title:
Spin-Polarizabilities of the Nucleon in Chiral Soliton Model with
  Dispersion Relation

abstract:
  We calculate the spin-polarizabilities of the nucleon by means of dispersion
relation, where the pion photoproduction amplitude predicted by chiral soliton
model is utilized. We consider the $N\pi$ and $\Delta\pi$ channels in the
pion-photoproduction amplitude, and also evaluate the contribution of the
anomalous term of the $\pi^0\gamma\gamma$ process. In a narrow decay-width
limit of the $\Delta$ particle the result coincides with that in heavy baryon
chiral perturbation theory (HBChPT) except for the interference part of the
electric and magnetic amplitudes. A comparison with the multipole analysis is
given.


title:
Can the Neutron Polarizabilities Be Determined from a Deuteron Compton
  Scattering Experiment?

abstract:
  A calculation of deuteron Compton scattering using non-relativistic
diagrammatic perturbation theory is presented, with the primary motivation of
investigating the feasibility of determining the neutron polarizabilities from
this type of experiment. This calculation is expected to be valid for energies
below 100 MeV. Previous theoretical and experimental estimates for the
polarizabilities are given. All diagrams are calculated by expanding the photon
wavefunctions into partial waves and using realistic deuteron wavefunctions.
The Green's function for the intermediate state in the dispersive states is
determined numerically. Pion-exchange, relativistic, and recoil corrections are
also included. The low-energy theorem is shown to be satisfied. The relative
effects of the different terms as well as their effects on the determinations
of the polarizabilities are discussed at energies of 49, 69, and 95 MeV. The
cross-section is dominated by the seagull, polarizability, and electromagnetic
multipole interactions. Relativistic and pion-exchange terms are also
important, while recoil corrections and multipoles of L=2 and greater are
negligible. The calculation provides a reasonable description of the
experimental data points at 49 and 69 MeV, except for the point at the greatest
angle. The polarizabilities are difficult to determine at these energies due to
the size of the experimental error bars. No data has been published at 95 MeV
but a more accurate determination of the polarizabilities is likely at this
higher energy. Detailed calculations for all terms can be found in the
appendices.


title:
Multiloop Diagrams in Non-Relativistic Field Theories and the Deuteron
  Quadrupole Moment

abstract:
  A new method is developed to calculate multiloop Feynman diagrams in
non-relativistic field theories. A consistent scheme for regularizing and
renormalizing loop integrals is established and shown to reproduce the results
of dimensional regularization (DR) and modified minimal subtraction MS^bar or
DR and power divergence subtraction (PDS) up to next-to-leading order (NLO).
However, significantly less effort is required to evaluate the integrals and
the methods are easily generalized to higher order graphs. Thus, even the most
complicated multiloop graph can be expressed in terms of analytic functions.
These techniques are then used to calculate the quadrupole moment of the
deuteron to three loops in the Kaplan, Savage, and Wise effective field theory.
A new unfixed direct S->D wave counterterm occurs at this order and its value
is determined.


title: Effect of Vector Meson Mass Decrease on Superfluidity in Nuclear Matter

abstract:
  $^1S_0$ pairing in nuclear matter is investigated by taking the hadron mass
decrease into account via the ``In-Medium Bonn potential'' which was recently
proposed by Rapp et al. The resulting gap is significantly reduced in
comparison with the one obtained with the original Bonn-B potential and we
ascertain that the meson mass decrease is mainly responsible for this
reduction.


title: Microscopic calculations of medium effects for 200-MeV (p,p') reactions

abstract:
  We examine the quality of a G-matrix calculation of the effective
nucleon-nucleon (NN) interaction for the prediction of the cross section and
analyzing power for 200-MeV (p,p') reactions that populate natural parity
states in $^{16}$O, $^{28}$Si, and $^{40}$Ca. This calculation is based on a
one-boson-exchange model of the free NN force that reproduces NN observables
well. The G-matrix includes the effects of Pauli blocking, nuclear binding, and
strong relativistic mean-field potentials. The implications of adjustments to
the effective mass ansatz to improve the quality of the approximation at
momenta above the Fermi level will be discussed, along with the general quality
of agreement to a variety of (p,p') transitions.


title:
Saturation of product's exoticity in compound nuclear reactions and its
  role in the production of new n-deficient nuclei with radioactive projectiles

abstract:
  Representation in terms of a new parameter, exoticity, a measure of
n-deficiency or p-richness, clearly brings out the saturation tendency of the
product's maximum exoticity in a compound nuclear reaction as the compound
nucleus is made more and more exotic using radioactive projectile (RIBs). The
effect of this saturation on the production of new proton-rich species with
RIBs over a wide Z-range has been discussed.


title:
Experimental and Theoretical Search for a Phase Transition in Nuclear
  Fragmentation

abstract:
  Phase transitions of small isolated systems are signaled by the shape of the
caloric equation of state e^*(T), the relationship between the excitation
energy per nucleon e^* and temperature. In this work we compare the
experimentally deduced e^*(T) to the theoretical predictions. The
experimentally accessible temperature was extracted from evaporation spectra
from incomplete fusion reactions leading to residue nuclei. The experimental
e^*(T) dependence exhibits the characteristic S-shape at e^* = 2-3 MeV/A. Such
behavior is expected for a finite system at a phase transition. The observed
dependence agrees with predictions of the MMMC-model, which simulates the total
accessible phase-space of fragmentation.


title:
Study of thermometers for measuring a microcanonical phase transition in
  nuclear fragmentation

abstract:
  The aim of this work is to study how the thermodynamic temperature is related
to the known thermometers for nuclei especially in view of studying the
microcanonical phase transition. We find within the MMMC-model that the
"S-shape" of the caloric equation of state e^*(T) which is the signal of a
phase transition in a system with conserved energy, can be seen in the
experimentally accessible slope temperatures T_slope for different particle
types and also in the isotopic temperatures T_He-Li. The isotopic temperatures
T_H-He are weaker correlated to the shape of the thermodynamic temperature and
therefore are less favorable to study the signal of a microcanonical phase
transition. We also show that the signal is very sensitive to variations in
mass of the source.


title: Neutron Polarizabilities From Compton Scattering on the Deuteron?

abstract:
  A calculation of deuteron Compton scattering using non-relativistic
perturbation theory is presented,with the primary motivation of investigating
the feasibility of determining the neutron polarizabilities from this type of
experiment. This calculation is expected to be valid for energies below 100
MeV. Pion-exchange, relativistic, and recoil corrections are also included. The
low-energy theorem for gauge invariance is shown to be satisfied. The relative
effects of the different terms and their effects on the determinations of the
polarizabilities are discussed at energies of 49, 69, and 95 MeV. The
cross-section is dominated by the seagull, polarizability, and electromagnetic
multipole interactions. Relativistic and pion-exchange terms are also
important, while recoil corrections and multipoles of $L$=2 and greater are
negligible. The calculation provides a reasonable description of the
experimental data points at 49 and 69 MeV. The polarizabilities are difficult
to determine at these energies. A more accurate determination of the
polarizabilities may be possible at 95 MeV.


title:
Splintering central nuclear collisions with a momentum-dependent lattice
  Hamiltonian theory

abstract:
  We formulate a lattice Hamiltonian model for intermediate energy heavy ion
collisions. Our approach incorporates a momentum-dependent nuclear mean field
that yields an optical potential that agrees with proton-nucleus experiments
and that also receives support from measurements involving heavy ions. We
emphasize the precision of our numerical results in connection with energy and
momentum conservation. We first outline the static properties of our solutions,
after which we consider recent stopping power results for heavy ion collisions.
The results obtained with different types of nuclear mean fields are compared
with each other. Consequences of the stopping power data on the nuclear
equation of state are outlined.


title: Precritical Chiral Fluctuations in Nuclei

abstract:
  Spectral enhancement near 2 m_{\pi} threshold in the I=J=0 channel in nuclei
is shown to be a distinct signal of the partial restoration of chiral symmetry.
  The relevance of this phenomenon with possible detection of 2\pi^{0} and
2\gamma in hadron-nucleus and photo-nucleus reactions is discussed.


title: Phi-meson photoproduction and strangeness of the nucleon

abstract:
  The polarization observables in phi photoproduction are suggested for probing
the nucleon strangeness. Based on models for phi photoproduction, some double
polarization observables are shown to be very sensitive to the strangeness
content of the proton because of the different spin structures of the
amplitudes associated with different mechanisms.


title: The Resurrection of a Symmetry in Nucleon - Nucleus Scattering

abstract:
  We re-examine a symmetry in nucleon - nucleus scattering that previously had
been proclaimed to be dead. We show that this symmetry is the continuum analog
of pseudospin symmetry, a relativistic symmetry which manifests itself in the
spectra of nuclei. Using experimental data only we show that pseudospin
symmetry in nucleon - nucleus scattering is not dead but only modestly broken
for 800 MeV proton scattering on nuclei.


title: Jost Function for Singular Potentials

abstract:
  An exact method for direct calculation of the Jost function and Jost
solutions for a repulsive singular potential is presented. Within this method
the Schrodinger equation is replaced by an equivalent system of linear
first-order differential equations, which after complex rotation, can easily be
solved numerically. The Jost function can be obtained to any desired accuracy
for all complex momenta of physical interest, including the spectral points
corresponding to bound and resonant states. The method can also be used in the
complex angular-momentum plane to calculate the Regge trajectories. The
effectiveness of the method is demonstrated using the Lennard-Jones (12,6)
potential. The spectral properties of the realistic inter-atomic He4-He4
potentials HFDHE2 and HFD-B of Aziz and collaborators are also investigated.


title:
Empirical Formalism For Projectile Fragmentation and Production of New
  Neutron-rich Nuclei with RIBs

abstract:
  A new empirical parametrization for the estimation of cross-sections of
projectile fragments has been prescribed for studying the advantages and
limitations of high energy RI beams for the production of new exotic nuclei.
The parametrization reproduces the experimental data for the production of
fragments from neutron rich projectiles accurately in contrast to the existing
parametrization which tends to overestimate the cross-section of neutron rich
fragments in most cases. The modified formalism has been used to compute the
cross-sections of neutron-rich species produced by fragmentation of radioactive
projectiles (RIBs). It has been found that, given any limit of production cross
-section, the exoticity of the fragment increases rather slowly and shows a
saturation tendency as the projectile is made more and more exotic.


title: Derivation of a Quark Confinement Potential from QCD

abstract:
  A quark confinement potential is derived from QCD Lagrangial under the two
assumptions in the energy region relevant to quark confinement. The possibility
of perturbation in QCD is assumed, and the momentum of the gluon transfered by
the quark is larger than the mass of the internal quark, so that the expansion
of ${m^2 /{q^2}}$ is assumed to be reliable. This potential comes from the one
loop diagrams in the expansion of $m^2 /{q^2}$, especially here, the vacuum
polarization diagram is examined. This explains the quark confinement mechanism
on the basis of QCD and the Regge trajectories which is governed by a linear
potential.


title: Scaling Properties of Pion Production

abstract:
  The scaling of pion multiplicities with system size in proton-nucleus and
nucleus-nucleus reactions at 200 A GeV is investigated. A nuclear geometry
calculation of incoherent multiple scattering including effects of deceleration
of the participating particles is presented. Pion multiplicities at high
transverse momenta agree relatively well with an overall scaling with the
number of binary collisions. The deviations from this gross scaling for p+A and
S+Au reactions at 200AGeV are compared to model predictions and the
implications are discussed. Within this picture no universal scaling law for
high pT particle production is obtained. In addition to the conceptual problems
of such an incoherent model, it is shown that the implied kinematic relation
between a possible pT-broadening and deceleration leads to contradictions. The
scaling of pion production at intermediate pT with system size does not
indicate a multiple scattering enhancement.


title: Neutrino nucleus scattering

abstract:
  The status of the theoretical description of neutrino-nuclear interaction for
low and intermediate energies is reviewed and its result compared with the
existing data. Particular emphasis is on $^{12}$C, the ingredient of liquid
scintillator, and on $^{16}$ the main component of the water \v{C}erenkov
detectors. First, I show that the data on the exclusive process populating the
ground state of $^{12}$N are well reproduced by the theory. This is also the
case for the excitation of the continuum with low energy neutrinos from the
muon decay at rest and for the muon capture. However, for not yet understood
reasons, the theory overestimates the cross section for higher energy neutrinos
from the pion decay in flight, by up to 50%. I also show that the Continuum
Random Phase Approximation and the Relativistic Fermi Gas model give very
similar full and differential cross sections for the neutrino energies of
several hundred MeV, thus checking one method against the other.


title: Soft-core baryon-baryon potentials for the complete baryon octet

abstract:
  SU(3) symmetry relations on the recently constructed hyperon-nucleon
potentials are used to develop potential models for all possible baryon-baryon
interaction channels. The main focus is on the interaction channels with total
strangeness S=-2, -3, and -4, for which no experimental data exist yet. The
potential models for these channels are based on SU(3) extensions of potential
models for the S=0 and S=-1 sectors, which are fitted to experimental data.
Although the SU(3) symmetry is not taken to be exact, the S=0 and S=-1 sectors
still provide the necessary constraints to fix all free parameters. The
potentials for the S=-2, -3, and -4 sectors, therefore, do not contain any
additional free parameters, which makes them the first models of this kind.
Various properties of the potentials are illustrated by giving results for
scattering lengths, bound states, and total cross sections.


title: About QCD sum rules for pion-nucleon coupling

abstract:
  We point out subtleties in the previous sum rule calculations of the $\pi NN$
coupling associated with using either the PV or the PS coupling schemes in
modeling the phenomenological side. We propose a sum rule which is independent
of the coupling schemes used and has less uncertainty in the OPE. The obtained
value is $g_{\pi N}=9.76 \pm 2.04$ where the uncertainty mainly comes from the
quark-gluon mixed condensate.


title: Strange hadron matter and SU(3) symmetry

abstract:
  We calculate saturation curves for strange hadron matter using recently
constructed baryon-baryon potentials which are constrained by SU(3) symmetry.
All possible interaction channels within the baryon octet (consisting of $N$,
$\Lambda$, $\Sigma$, and $\Xi$) are considered. It is found that a small
$\Lambda$ fraction in nuclear matter slightly increases binding, but that
larger fractions ($>10%$) rapidly cause a decrease. Charge-neutral
${N,\Lambda,\Xi}$ systems, with equal densities for nucleons and cascades, are
only very weakly bound. The dependence of the binding energies on the
strangeness per baryon, $f_s$, is predicted for various ${N,\Lambda,\Xi}$ and
${N,\Lambda,\Sigma,\Xi}$ systems. The implications of our results in
relativistic heavy-ion collisions and the core of a dense star are discussed.
We also discuss the differences between our results and previous hadron matter
calculations.


title:
Intensity-dependent pion-nucleon coupling in multipion production
  processes

abstract:
  We propose an intensity-dependent pion-nucleon coupling Hamiltonian within a
unitary multiparticle-production model of the Auerbach-
Avin-Blankenbecler-Sugar (AABS) type in which the pion field is represented by
the thermal-density matrix.Using this Hamiltonian, we explain the appearance of
the negative-binomial (NB) distribution for pions and the well-known empirical
relation, the so-called Wr\' oblewski relation, in which the dispersion $D$ of
the pion- multiplicity distribution is linearly related to the average
multiplicity $<n>$ : $D = A <n> + B$, with the coefficient $A < 1$. The
Hamiltonian of our model is expressed linearly in terms of the generators of
the $SU(1,1)$ group.We also find the generating function for the pion field,
which reduces to the generating function of the NB distribution limit $T \to
0$.


title:
Beyond the Adiabatic Approximation: the impact of thresholds on the
  hadronic spectrum

abstract:
  In the adiabatic approximation, most of the effects of quark-antiquark loops
on spectroscopy can be absorbed into a static interquark potential. I develop a
formalism which can be used to treat the residual nonadiabatic effects
associated with the presence of nearby hadronic thresholds for heavy quarks. I
then define a potential which includes additional high energy corrections to
the adiabatic limit which would be present for finite quark masses. This
"improved" potential allows a systematic low energy expansion of the impact of
thresholds on hadronic spectra.


title: Low-Energy Theorems for QCD at Finite Temperature and Chemical Potential

abstract:
  The low-energy theorems for QCD are generalized to finite temperature. and
chemical potential, including non-zero quark masses.


title: Coulomb dissociation of 19C

abstract:
  We aim to re-investigate the structure of the neutron rich exotic nucleus
^{19}C through studies of its Coulomb breakup reactions, assuming that its
excitation is to states in the low energy continuum. The method used retains
all finite-range effects associated with the interactions between the breakup
fragments and can use realistic wave functions for this possibly halo nucleus.
We apply the method to compute the longitudinal momentum distribution of
^{18}C, exclusive neutron angular distribution and relative energy spectrum of
^{19}C following Coulomb breakup of ^{19}C on heavy targets at beam energies
below 100 MeV/nucleon. The calculated results are compared with recently
available experimental data. In the majority of the few cases, the data favour
^{18}C(0^+) \otimes 1s_{1/2} as the probable ground state configuration of
^{19}C, with a one-neutron separation energy of 0.53 MeV. However, it appears
that the existing experimental data do not allow to draw a clear conclusion
about the ground state configuration of this nucleus.


title: Recent Progress in Nuclear Astrophysics

abstract:
  The manuscript reviews progress achieved in recent years in various aspects
of nuclear astrophysics, including stellar nucleosynthesis, nuclear aspects of
supernova collapse and explosion, neutrino-induced reactions and their possible
role in the supernova mechanism and nucleosynthesis, explosive hydrogen burning
in binary systems, and finally the observation of $\gamma$-rays from supernova
remnants.


title: Structure of nuclei at extreme values of the isospin

abstract:
  Physics of nuclei at extreme values of the isospin is at the focus of
present-day nuclear science. Experimentally, thanks to existing and emerging
radioactive-ion-beam facilities, we are on the verge of invading the territory
of extreme N/Z ratios in an unprecedented way. Theoretically, nuclear exotica
represent a formidable challenge for the nuclear many-body theories and their
power to predict nuclear properties far from stability. Going to the limits of
the nuclear binding is also important for an improvement of our description of
normal nuclei from the neighborhood of the beta stability valley. In the
present talk, we review several aspects of the present-day mean-field
theoretical studies of weakly bound nuclei.


title: The Nuclear Physics of Solar and Supernova Neutrino Detection

abstract:
  This talk provides a basic introduction for students interested in the
responses of detectors to solar, supernova, and other low-energy neutrino
sources. Some of the nuclear physics is then applied in a discussion of
nucleosynthesis within a Type II supernova, including the r-process and the
neutrino process.


title: $pp \to pK^{+}\Lambda$ reaction in an effective Lagrangian model

abstract:
  We investigate the $pp \to pK^{+}\Lambda$ reaction within an effective
Lagrangian model where the contributions to the amplitudes are taken into
account within the tree level. The initial interaction between the two nucleons
is modeled by the exchange of $\pi$, $\rho$, $\omega$ and $\sigma$ mesons and
the $\Lambda K^{+}$ production proceeds via the excitation of the $N^*$(1650),
$N^*$(1710), $N^*$(1720) baryonic resonances. The parameters of the model at
the nucleon-nucleon-meson vertices are determined by fitting the elastic
nucleon-nucleon scattering with an effective interaction based on the exchange
of these four mesons, while those at the resonance vertices are calculated from
the known decay widths of the resonances as well as the vector meson dominance
model. Available experimental data is described well by this approach. The
one-pion-exchange diagram dominates the production process at both higher and
lower beam energies. The $\rho$ and $\omega$ meson exchanges make negligible
contributions. However, the $\sigma$-exchange processes contribute
substantially to the total cross sections at lower beam energies. The
excitation of the $N^*$(1710) and $N^*$(1650) resonances dominate this reaction
at beam momenta above and below 3 GeV/c respectively. The interference among
the amplitudes of various resonance excitation processes is significant. For
beam energies very close to the $K^{+}$ production threshold the hyperon-proton
final state interaction effects are quite important. The data is selective
about the model used to describe the low energy scattering of the two final
state baryons.


title: e+ e- pairs from pi- A reactions

abstract:
  We calculate dilepton production for the reactions $\pi^-$C and $\pi^-$Pb at
1.3 GeV within a semi-classical BUU transport model and compare our results to
a previously published calculation. We show that a modified treatment of the
$\rho$-meson production and propagation gives substantially different results.
We, furthermore, discuss uncertainties related to the electromagnetic decay of
the $\rho$-meson and the elementary $\pi^- N \to e^+ e^- X$ channels.


title:
On the production mechanism of Sigma-hypernuclear systems in A(K-,pi+-)
  reactions

abstract:
  It is shown that the new data on the excitation energy Eex spectrum of the
residual nuclear system in the Sigma-hypernuclear region in the reactions
(K-,pi+-) on Be-9 and in the reaction (K-,pi+) on He-4 and C-12 can be
described without the supposition on the existence of excited
Sigma-hypernuclear states. The basis is formed by a simultaneous consideration
of the quasi-free Sigma production and Sigma-nuclear rescattering (elastic and
with Sigma -> Lambda conversion) with account of interference of the respective
amplitudes. For final decision of the question about the nature of the
irregularities in Eex spectrum, it is proposed to study the picture
corresponding to the so-called moving complex singularity of the triangle graph
with Sigma rescattering: the position and the width of the peak in Eex
distribution must appreciably change with momentum transferred from the initial
kaon to the final pion.


title: Hadronic Atoms and Effective Interactions

abstract:
  We examine the problem of hadronic atom energy shifts using the technique of
effective interactions and demonstrate equivalence with the conventional
quantum mechanical approach.


title:
Thermo field hydrodynamic and kinetic equations of dense quantum nuclear
  systems

abstract:
  Basic equations of nonequilibrium thermo field dynamics of dense quantum
systems are presented. A formulation of nonequilibrium thermo field dynamics
has been performed using the nonequilibrium statistical operator method by
D.N.Zubarev. Hydrodynamic equations have been obtained in thermo field
representation. Two levels of the description of kinetics and hydrodynamics of
a dense nuclear matter are considered. The first one is a quantum system with
strongly coupled states, the second one is a quark-gluon plasma. Generalized
transfer equations of a consistent description of kinetics and hydrodynamics
have been obtained, as well as limiting cases are considered.


title: Flash of Prompt Photons from the Early Stage of Heavy-Ion Collisions

abstract:
  We briefly recall the tremendous strides in the studies of the parton cascade
model made by Klaus Geiger. Next, we argue that photons may provide
confirmation of several of these ideas. Thus we know that, copious internetted
partonic cascades may develop in the wake of relativistic collisions of nuclei
at CERN SPS and BNL RHIC energies, We use the parton cascade model to estimate
the emission of single photons generated from such cascades due to the
branching of quarks $q \to q \gamma$, scattering of quarks and gluons, and
annihilation of quarks. The formation of a hot and dense partonic matter is
shown to be preceded by an intense radiation of photons from the QED branching
of quarks. This is similar to the QCD branching $q \to qg$ which along with the
gluon multiplication ($g \to gg$) which is known to play a crucial role in the
formation of the dense partonic plasma.


title: Backbending in Dy isotopes within the Projected Shell Model

abstract:
  A systematic study of the yrast band in 154-164 Dy isotopes using the
Projected Shell Model is presented. It is shown that, in the context of the
present model, enlarging the mean field deformation by about 20 % allows a very
good description of the spectrum of yrast band in these isotopes. The
dependence of the B(E2) values on angular momentum is also better described
when larger deformations are used. The observed oscillation of g-factors at low
spin states remains an open question for this model.


title:
Analysis of correlation data of pi^+pi^- pair in p + Ta reaction using
  Coulomb wave function including momentum resolution and strong interaction
  effect

abstract:
  We have proposed a new method for the Coulomb wave function correction which
includes the momentum resolution for charged hadron pairs and applied it to the
precise data on pi^+pi^- correlations obtained in p + Ta reaction at 70 GeV/c.
It is found that interaction regions of this reaction (assuming Gaussian source
function) are 9.8+-5.8 fm and 7.7+-4.8 fm for the thicknesses of the target 8
micro m and 1.4 micro m, respectively. We have also analyzed the data by the
formula including strong interaction effect. The physical picture of the source
size obtained in this way is discussed.


title:
Direct Emission of multiple strange baryons in ultrarelativistic
  heavy-ion collisions from the phase boundary

abstract:
  We discuss a model for the space-time evolution of ultrarelativistic
heavy-ion collisions which employs relativistic hydrodynamics within one region
of the forward light-cone, and microscopic transport theory (i.e. UrQMD) in the
complement. Our initial condition consists of a quark-gluon plasma which
expands hydrodynamically and hadronizes. After hadronization the solution
eventually changes from expansion in local equilibrium to free streaming, as
determined selfconsistently by the interaction rates between the hadrons and
the local expansion rate. We show that in such a scenario the inverse slopes of
the $m_T$-spectra of multiple strange baryons ($\Xi$, $\Omega$) are practically
unaffected by the purely hadronic stage of the reaction, while the flow of
$p$'s and $\Lambda$'s increases. Moreover, we find that the rather ``soft''
transverse expansion at RHIC energies (due to a first-order phase transition)
is not washed out by strong rescattering in the hadronic stage. The earlier
kinetic freeze-out as compared to SPS-energies results in similar inverse
slopes (of the $m_T$-spectra of the hadrons in the final state) at RHIC and SPS
energies.


title: Modern NN Force Predictions for the Total ND Cross Section up to 300 MeV

abstract:
  For several modern nucleon-nucleon potentials state-of-the-art Faddeev
calculations are carried out for the $nd$ total cross section between 10 and
300 MeV projectile energy and compared to new high precision measurements. The
agreement between theory and data is rather good, with exception at the higher
energies where a 10% discrepancy builds up. In addition the convergence of the
multiple scattering series incorporated in the Faddeev scheme is studied
numerically with the result, that rescattering corrections remain important.
Based on this multiple scattering series the high energy limit of the total
$nd$ cross section is also investigated analytically. In contrast to the naive
expectation that the total $nd$ cross section is the sum of the $np$ and $nn$
total cross sections we find additional effects resulting from the rescattering
processes, which have different signs and different behavior as function of the
energy. A shadowing effect in the high energy limit only occurs for energies
higher than 300 MeV. The expressions in the high energy limit have
qualitatively a similar behavior as the exactly calculated expressions, but can
be expected to be valid quantitatively only at much higher energies.


title: Collisional relaxation of collective motion in a finite Fermi liquid

abstract:
  Finite size effects in the equilibrium phase space density distribution
function are taken into account for alculations of the relaxation of collective
motion in finite nuclei. Memory effects in the collision integral and the
diffusivity and the quantum oscillations of the equilibrium distribution
function in momentum space are considered. It is shown that a smooth diffuse
(Fermi-type) equilibrium distribution function leads to a spurious contribution
to the relaxation time. The residual quantum oscillations of the equilibrium
distribution function eliminates the spurious contribution. It ensures the
disappearance of the gain and loss terms in the collision integral in the
ground state of the system and strongly reduces the internal collisional width
of the isoscalar giant quadrupole resonances.


title:
The O(N) Model at Finite Temperature: Renormalization of the Gap
  Equations in Hartree and Large-N Approximation

abstract:
  The temperature dependence of the sigma meson and pion masses is studied in
the framework of the O(N) model. The Cornwall-Jackiw-Tomboulis formalism is
applied to derive gap equations for the masses in the Hartree and large-N
approximations. Renormalization of the gap equations is carried out within the
cut-off and counter-term renormalization schemes. A consistent renormalization
of the gap equations within the cut-off scheme is found to be possible only in
the large-N approximation and for a finite value of the cut-off. On the other
hand, the counter-term scheme allows for a consistent renormalization of both
the large-N and Hartree approximations. In these approximations, the meson
masses at a given nonzero temperature depend in general on the choice of the
cut-off or renormalization scale. As an application, we also discuss the
in-medium on-shell decay widths for sigma mesons and pions at rest.


title:
Generalized routhian calculations within the Skyrme-Hartree-Fock
  approximation

abstract:
  We consider here variational solutions in the Hartree-Fock approximation upon
breaking time reversal and axial symmetries. When decomposed on axial harmonic
oscillator functions, the corresponding single particle triaxial eigenstates as
functions of the usual cylindrical coordinates (r, $\theta$, z) are evaluated
on a mesh in r and z to be integrated within Gauss-Hermite and Gauss-Laguerre
approaches and as Fourier decompositions in the angular variable $\theta$.
Using an effective interaction of the Skyrme type, the Hartree-Fock hamiltonian
is also obtained as a Fourier series allowing a two dimensional calculation of
its matrix elements. This particular choice is shown to lead in most cases to
shorter computation times compared to the usual decomposition on triaxial
harmonic oscillator states. We apply this method to the case of the
semi-quantal approach of large amplitude collective motion corresponding to a
generalized routhian formalism and present results in the A=150 superdeformed
region for the coupling of global rotation and intrinsic vortical modes in what
is known after Chandrasekhar as the S-ellipsoid coupling case.


title: Many-particle nucleon-nucleon forces from nuclear single-particle states

abstract:
  As follows from the energies of single-particle states in ^{40}Ca, ^{90}Zr
and ^{208}Pb nuclei the contribution of many-particle NN forces to the nuclear
single-particle potential is at least the sum of repulsive and attractive parts
resulting from three-particle and four-particle forces respectively. In
addition the specified nucleon density distributions in the above nuclei are
determined from both the 1 GeV proton-nucleus elastic scattering and the
single-particle energies.


title:
Dimensional versus cut-off renormalization and the nucleon-nucleon
  potential of the effective field theory

abstract:
  The role of cut-off and dimensional regularizations is discussed in the
context of obtaining a renormalized nucleon-nucleon potential from the chiral
Lagrangian formulation of the effective field theory due to Weinberg. Both
types of renormalizations are performed for the sum of an attractive delta
function and its derivatives. The equivalence between the two forms of
regularizations can be established with the use of energy-dependent bare
couplings and the explicit forms of these couplings are determined.

categories: nucl-th cond-mat hep-lat hep-ph quant-ph


title: Backward hadron production in neutrino-nucleus interactions

abstract:
  The production of backward pions in lepton-nucleus collisions is analyzed. We
show that a large yield of high momentum backward pions can be explained by the
Regge asymptotic of the distribution of nucleons carrying a large momentum
fraction in the nuclear target. The calculated spectra of pions emitted in the
neutrino + Ne --> muon + pion + X reaction are in satisfactory agreement with
the available experimental data.


title: Chiral two-pion exchange and proton-proton partial-wave analysis

abstract:
  The chiral two-pion exchange component of the long-range pp interaction is
studied in an energy-dependent partial-wave analysis. We demonstrate its
presence and importance, and determine the chiral parameters c_i (i=1,3,4). The
values agree well with those obtained from pion-nucleon amplitudes.


title: Unitary-model-operator approach to $\Lambda$ hypernuclei

abstract:
  A method is formulated for the description of lambda hypernuclei in the
framework of the unitary-model-operator approach (UMOA). The method is applied
to $_{\Lambda}^{17}$O. A lambda-nucleon effective interaction is derived,
taking the coupling of the sigma-nucleon channel into account. The lambda
single-particle energies are calculated for the 0s_{1/2}, 0p_{3/2} and 0p_{1/2}
states employing the Nijmegen soft-core (NSC), J\"ulich model-\~A (J\~A) and
model-\~B (J\~B) hyperon-nucleon potentials.


title: Real and Virtual Compton Scattering at Low Energies

abstract:
  These lectures give a pedagogical introduction to real and virtual Compton
scattering at low energies.
  We will first discuss real Compton scattering off a point particle as well as
a composite system in the framework of nonrelativistic quantum mechanics.
  The concept of electromagnetic polarizabilities is introduced.
  We then address a description of the Compton-scattering tensor within quantum
field theory with particular emphasis on the derivation of low-energy theorems.
  The importance of a consistent treatment of hadron structure in the use of
electromagnetic vertices is stressed.
  Finally, the reader is introduced to the notion of generalized
polarizabilities in the rapidly expanding field of virtual Compton scattering.


title:
Impact parameter dependencies in Pb(160 AGeV)+Pb reactions --
  hydrodynamical vs. cascade calculations

abstract:
  We investigate the impact parameter dependence of the specific entropy S/A in
relativistic heavy ion collisions. Especially the anti-Lambda/anti-proton ratio
is found to be a useful tool to distinguish between chemical equilibrium
assumptions assumed in hydrodynamics (here: the 3-fluid model) and the chemical
non-equilibrium scenario like in microscopic models as the UrQMD model.


title: Model independent constraints from vacuum and in-medium QCD Sum Rules

abstract:
  We discuss QCD sum rule constraints based on moments of vector meson spectral
distributions in the vacuum and in a nuclear medium. Sum rules for the two
lowest moments of these spectral distributions do not suffer from uncertainties
related to QCD condensates of dimension higher than four. We exemplify these
relations for the case of the omega meson and discuss the issue of in-medium
mass shifts from this viewpoint.


title:
Subtracted Dispersion Relations for In-Medium Meson Correlators in QCD
  Sum Rules

abstract:
  We analyze subtracted dispersion relations for meson correlators at finite
baryon density and temperature. Such relations are needed for QCD sum rules. We
point out the importance of scattering terms, as well as finite, well-defined
subtraction constants. Both are necessary for consistency, in particular for
the equality of the longitudinal and transverse correlators in the limit of the
vanishing three-momentum of mesons relative to the medium. We present detailed
calculations in various mesonic channels for the case of the Fermi gas of
nucleons.


title:
Study of the $^7Be(p,\gamma)^8B$ and $^7Li(n,\gamma)^8Li$ capture
  reactions using the shell model embedded in the continuum

abstract:
  We apply the realistic shell model which includes the coupling between
many-particle (quasi-)bound states and the continuum of one-particle scattering
states to the spectroscopy of mirror nuclei: $^8$B and $^8$Li, as well as to
the description of low energy cross sections (the astrophysical S factors) in
the capture reactions:$^7Be(p,\gamma)^8B$ and $^7Li(n,\gamma)^8Li$.


title:
Particle emission following Coulomb excitation in ultrarelativistic
  heavy-ion collisions

abstract:
  We study nuclear reactions induced by virtual photons associated with
Lorentz-boosted Coulomb fields of ultrarelativistic heavy ions. Evaporation,
fission and multifragmentation mechanisms are included in a new RELDIS code,
which describes the deexcitation of residual nuclei formed after single and
double photon absorption in peripheral heavy-ion collisions. Partial cross
sections for different dissociation channels, including the multiple neutron
emission ones, are calculated and compared with data when available. Rapidity
and transverse momentum distributions of nucleons, nuclear fragments and pions,
produced electromagnetically, are also calculated. These results provide
important information for designing large-rapidity detectors and zero-degree
calorimeters at RHIC and LHC. The electromagnetic dissociation of nuclei
imposes some constrains on the investigation of exotic particle production in
gamma-gamma fusion reactions.


title:
Beyond Mean Field Confrontation of Different Models with High Transverse
  Momentum Proton Spectra

abstract:
  Several models have been proposed to simulate heavy ion reactions beyond the
mean field level. The lack of data in phase space regions which may be
sensitive to different treatments of fluctuations made it difficult to judge
these approaches. The recently published high energy proton spectra, measured
in the reaction 94 AMeV Ar + Ta, allow for the first time for a comparison of
the models with data. We find that these spectra are reproduced by Quantum
Molecular Dynamics (QMD) and Boltzmann Uehling Uhlenbeck (BUU) calculations.
Models like Boltzmann Langevin (BL) in which additional fluctuations in
momentum space are introduced overpredict the proton yield at very high
energies. The BL approach has been successfully used to describe the recently
measured very subthreshold kaon production assuming that the fluctuations
provide the necessary energy to overcome the threshold in two body collisions.
Our new findings suggest that the very subthreshold kaon production cannot be
due to two body scattering and thus remains a open problem.


title: Rotational Invariance In Nuclear Light-Front Mean Field Theory

abstract:
  A light-front treatment for spherical nuclei is developed from a relativistic
effective Lagrangian and employing the mean field approximation. Minimizing the
nuclear minus momentum subject to the constraint that, in the rest frame, the
expectation values of the plus- and minus-momenta are the same leads to a
formalism in which rotational invariance is recovered.


title: Radiation pions in two-nucleon effective field theory

abstract:
  For interactions involving two or more nucleons it is useful to divide pions
into three classes: potential, radiation, and soft. The momentum threshold for
the production of radiation pions is $Q_r = \sqrt{M_N m_\pi}$. We show that
radiation pions can be included systematically with a power counting in $Q_r$.
The leading order radiation pion graphs which contribute to NN scattering are
evaluated in the PDS and OS renormalization schemes and are found to give a
small contribution. The power counting for soft pion contributions is also
discussed.


title: Testing Low Energy Theorems in Nucleon-Nucleon Scattering

abstract:
  Low energy theorems have been derived for the coefficients of the effective
range expansion in s-wave nucleon-nucleon scattering valid to leading
nontrivial order in an expansion based $Q$ counting, a scheme in which both
$m_\pi$ and $1/a$ (where $a$ is the scattering length) are treated as small
mass scales. Previous tests of these theorems based on coefficients extracted
from scattering data indicate a pattern of gross violations which suggested
serious problems for the perturbative treatment of pions implicit in $Q$
counting. We discuss the possibility that uncertainties associated with
extracting the coefficients from the scattering data make such tests invalid.
Here we show that errors in the s-wave phase shift extractions are sufficiently
small to test direct test predictions from $Q$ counting at next to leading
order. In particular we show that there exist low energy theorems for the sum
of all terms in the effective range expansion beyond the first two which allow
for precise tests. These low energy theorems fail badly which suggests that
pionic aspects of $Q$ counting are not under control.


title: Nucleon Resonances in Kaon Photoproduction

abstract:
  Nucleon resonances are investigated through the electromagnetic production of
K-mesons. We study the kaon photoproduction process at tree-level and compare
to a recently developed unitary K-matrix approach. Employing hadronic form
factors along with the proper gauge prescription yields suppression of the Born
terms and leads a resonance dominated process for both K-Lambda and K-Sigma
photoproduction. Using new SAPHIR data we find the K+-Lambda photoproduction to
be dominated by the S11(1650) at threshold, with additional contributions from
the P11(1710) and P13(1720) states. The K-Sigma channel couples to a cluster of
Delta resonances around W = 1900 MeV. We briefly discuss some tantalizing
evidence for a missing D13 resonance around 1900 MeV with a strong branching
ratio into KLambda channel.


title:
The nucleon-nucleon interaction and properties of the nucleon in a
  $\pi\rho\omega$ soliton model including a dilaton field with anomalous
  dimension

abstract:
  We investigate an extended chiral soliton model which includes $\pi, \rho,
\omega$ and $\sigma $ mesons as explicit degrees of freedom. The Lagrangian
incorporates chiral symmetry and broken scale invariance. A scalar-isoscalar
meson $\sigma$ is associated with a quarkonium dilaton field with a mass
$\msig\approx 550 $MeV. We show that the scalar field with anomalous dimension
slightly changes the static and electromagnetic properties of the nucleon. In
contrast, it plays a significant role in nucleon-nucleon dynamics and gives an
opportunity to describe well the two-nucleon interaction.


title: H-Dihyperon in Quark Cluster Model

abstract:
  The H dihyperon (DH) is studied in the framework of the SU(3) chiral quark
model. It is shown that except the $\sigma$ chiral field, the overall effect of
the other SU(3) chiral fields is destructive in forming a stable DH. The
resultant mass of DH in a three coupled channel calculation is ranged from 2225
$MeV$ to 2234 $MeV$.


title: Deltaron Dibaryon Structure in Chiral SU(3) Quark Model

abstract:
  We discuss the structure of Deltaron dibaryon in the chiral SU(3) quark
model. The energy of Deltaron is obtained by considering the coupling of the
$\Delta\Delta$ and $CC$ (hidden color) channels. The effects of various
parameters on the Deltaron mass are also studied. It is shown that the mass of
Deltaron is lower than the mass of $\Delta\Delta$ but higher than the mass of
$\Delta N \pi$.


title: Pair correlations in high-K bands

abstract:
  The tilted axis cranking model is used in combination with the random phase
approximation and particle number projection to analyze the influence of
dynamical pair correlations in the high-K bands of 178-W and their effect on
relative energy and angular momentum. The calculations show the importance of
dynamical pair correlations to describe the experiment as well as advantages
and problems with the different models in the superfluid and normal state
regions.


title: On the distinct observation of the moving triangle singularity

abstract:
  It is shown that nonzero orbital momentum in the vertex of secondary
interaction in the triangle graph leads to a more clear picture corresponding
to the moving complex singularity compared with the case of constant vertex.
The peak in the distribution of the final particles invariant mass becomes
narrower and its shift with momentum transfer more distinct. It opens the
possibility to observe this picture experimentally.


title: Photon Absorption on a Neutron-Proton Pair in 3He and 4He

abstract:
  We have developed a phenomenological quasi-deuteron model to describe
photodisintegration reactions of $^3$He and $^4$He at intermediate photon
energies, and compared the results with experimental data obtained by TAGX
group in which contributions from photon absorption by $pn$ pair were
selectively observed. The data can be reproduced reasonably well, however there
still remain certain discrepancies between calculated results and data.


title: Computer Study of Isotope Production in High Power Accelerators

abstract:
  Methods for radionuclide production calculation in a high power proton
accelerator have been developed and applied to study production of 22 isotopes
by high-energy protons and neutrons. These methods are readily applicable to
accelerator, and reactor, environments other than the particular model we
considered and to the production of other radioactive and stable isotopes. We
have also developed methods for evaluating cross sections from a wide variety
of sources into a single cross section set and have produced an evaluated
library covering about a third of all natural elements. These methods also are
applicable to an expanded set of reactions. A 684 page detailed report on this
study, with 37 tables and 264 color figures is available on the Web at
http://t2.lanl.gov/publications/publications.html, or, if not accessible, in
hard copy from the authors.


title: Resonances in the three-neutron system

abstract:
  A study of 3-body resonances has been performed in the framework of
configuration space Faddeev equations. The importance of keeping a sufficient
number of terms in the asymptotic expansion of the resonance wave function is
pointed out. We investigated three neutrons interacting in selected force
components taken from realistic nn forces.


title: Parametrization of the octupole degrees of freedom

abstract:
  A simple parametrization for the octupole collective variables is proposed
and the symmetries of the wave functions are discussed in terms of the
solutions corresponding to the vibrational limit. [PACS: 21.60Ev, 21.60.Fw,
21.10.Re]


title: Topics in Neutrino Astrophysics

abstract:
  These lectures cover three topics in neutrino astrophysics. The solar
neutrino problem is reviewed, with particular emphasis on the microphysics of
the standard solar model, detector responses, the quantum mechanics of the MSW
mechanism, and the possibility of spin-flavor oscillations. In the second
lecture the electromagnetic properties of Dirac and Majorana neutrinos are
discussed. Two classic problems in red giant evolution - the triple alpha
reaction and the delay of the He flash by anomalous cooling - are used to
illustrate how stellar cooling arguments constrain neutrino properties. Axion
and Dirac neutrino mass effects on supernova cooling are also discussed. The
third lecture describes the supernova explosion mechanism and the associated
nucleosynthesis. The neutrino process and r-process are discussed, including
the "neutrino fingerprint" on the latter that supports earlier suggestions that
the r-process site is near the mass cut of a type II supernova. The effects of
tau neutrino oscillations on the r-process are described briefly. The material
is presented at a level suitable for graduate students at the beginning of
their research careers.


title:
Nucleon form factors in a light-front framework: a model with
  instanton-induced forces

abstract:
  Nucleon form factors are evaluated in the spacelike region in a light-front
framework. Our phenomenological model is based on a relativistic formulation of
the Hamiltonian dynamics. The baryon dynamics is solved in the CMS with
relativistic kinetic energy, linearly rising confining potential and a residual
interaction based on instanton-induced forces, the so-called 't Hooft
interaction. The wavefunctions of the model are used to compute the nucleon
form factors in the impulse approximation. In spite of taking no
phenomenological constituent quark form factor by the one-body electromagnetic
current, we obtain a very good description of all electromagnetic form factors
for momentum transfers up to -3 GeV^2. The effect of the 't Hooft interaction
is carefully examined in the model.


title: Chemical fluctuations in high-energy nuclear collisions

abstract:
  Fluctuations of the chemical composition of the hadronic system produced in
nuclear collisions are discussed using the $\Phi-$measure which has been
earlier applied to study the transverse momentum fluctuations. The measure is
expressed through the moments of the multiplicity distribution and then the
properties of $\Phi$ are discussed within a few models of multiparticle
production. A special attention is paid to the fluctuations in the equilibrium
ideal quantum gas. The system of kaons and pions, which is particularly
interesting from the experimental point of view, is discussed in detail.


title: A New Renormalization Group for Hamiltonian Field Theory

abstract:
  The Schrodinger equation with a two-dimensional delta-function potential is a
simple example of an asymptotically free theory that undergoes dimensional
transmutation. Renormalization requires the introduction of a mass scale, which
can be lowered perturbatively until an infrared cutoff produced by
non-perturbative effects such as bound state formation is encountered. We
outline the effective field theory and similarity renormalization group
techniques for producing renormalized cutoff hamiltonians, and illustrate the
control of logarithmic and inverse-power-law errors both techniques provide.


title: Light-Front Quantum Chromodynamics

abstract:
  Light-front quantum chromodynamics may lead to an accurate constituent
approximation for the low-energy properties of hadrons. This requires a cutoff
that violates explicit gauge invariance and Lorentz covariance, leading to the
calculation of a renormalized QCD hamiltonian using a similarity
renormalization group. Renormalization repairs broken symmetries, and in
light-front field theory it moves dynamical effects that usually require large
numbers of partons to few-body effective interactions. This has been shown to
work in QED through dominant contributions to the Lamb shift. In QCD
logarithmic confinement arises at second order, and initial bound state
calculations produce reasonable results.


title:
Theoretical Constraints for Observation of Superdeformed Bands in the
  Mass-60 Region

abstract:
  The lightest superdeformed nuclei of the mass-60 region are described using
the Projected Shell Model. In contrast to the heaviest superdeformed nuclei
where a coherent motion of nucleons often dominates the physics, it is found
that alignment of $g_{9/2}$ proton and neutron pairs determines the high spin
behavior for superdeformed rotational bands in this mass region. It is
predicted that, due to the systematics of shell fillings along the even--even
Zn isotopic chain, observation of a regular superdeformed yrast band sequence
will be unlikely for certain nuclei in this mass region.


title: Equivalence of Nonstatic Two-Pion-Exchange Nucleon-Nucleon Potentials

abstract:
  Off-shell aspects of the one-pion-exchange potential and their relationship
to different forms of the nonstatic (subleading-order) chiral two-pion-exchange
nucleon-nucleon potential are discussed. Various types of off-shell behavior
are categorized and numerous examples are given. Recently derived potentials
based on chiral approaches are supplemented by a rather general form of the
two-pion-exchange potential derived using old-fashioned methods. The latter is
closely related to a general form of one-pion-exchange relativistic corrections
and nonstatic two-pion-exchange three-nucleon forces developed long ago.


title: Delta-N Electromagnetic Transition

abstract:
  The EM ratio for a free Delta electromagnetic transition is discussed within
the frame work of nonrelativistic approach. Such an approach gives a good
account of data for a free Delta but is less important for an intrinsically
relativistic nuclear many body problem.


title: A quark-meson coupling model with short-range quark-quark correlations

abstract:
  Short-range quark-quark correlations are introduced into the quark-meson
coupling (QMC) model in a simple way. The effect of these correlations on the
structure of the nucleon in dense nuclear matter is studied. We find that the
short-range correlations may serve to reduce a serious problem associated with
the modified quark-meson coupling model (within which the bag constant is
allowed to decrease with increasing density), namely the tendency for the size
of the bound nucleon to increase rapidly as the density rises. We also find
that, with the addition of correlations, both QMC and modified QMC are
consistent with the phenomenological equation of state at high density.


title:
The Collective Excitation Spectra of $\sigma, \omega$ and $\pi$ Mesons
  in Nuclear Matter

abstract:
  The recent progress on the study of the collective excitation in relativistic
nuclear matter is reviewed. The collective excitation modes are derived by
meson propagators in nuclear matter. The mesons we study are $\sigma, \omega,
\gamma$ and $\pi$ mesons. For pion, we derived not only the relativistic
particle - hole, delta - hole excitations but also antiparticle excitations,
such as particle - antiparticle, antidelta - particle, delta - antiparticle
excitations. By calculating the dispersion relation and the spin - isospin
dependent response function, the effects of all these excitation are studied.