id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
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nucl-th/9307014 | Calculation of the properties of the rotational bands of $^{155,157}$Gd | We reexamine the long-standing problem of the microscopic derivation of a
particle-core coupling model. We base our research on the Klein-Kerman
approach, as amended by D\"onau and Frauendorf. We describe the formalism to
calculate energy spectra and transition strengths in some detail. We apply our
formalism to the ro... | 1993-07-14 | 2008-11-26 | [
"nucl-th"
] | Pavlos Protopapas, Abraham Klein, and Niels R. Walet |
nucl-th/9307012 | Effects of meson-exchange currents on the $(\protect\vec{e},e'p)$
structure functions | The response functions for the unpolarized $(e,e'p)$ and polarized
$(\vec{e},e'p)$ reaction are calculated for medium-heavy nuclei under quasifree
conditions. The formalism presented here incorporates two-body currents related
to meson-exchange and the $\Delta (1232)$ excitation. The final-state
interaction of the outg... | 1993-07-13 | 2008-11-26 | [
"nucl-th"
] | V. Van der Sluys, J. Ryckebusch and M. Waroquier |
nucl-th/9307011 | Space-time Structure of Initial Parton Production in Ultrarelativistic
Heavy Ion Collisions | The space and time evolution of initial parton production in
ultrarelativistic heavy ion collisions is investigated within the framework of
perturbative QCD which includes both initial and final state radiations.
Uncertainty principle is used to relate the life time of a radiating parton to
its virtuality and momentum.... | 1993-07-12 | 2009-10-22 | [
"nucl-th",
"hep-ph"
] | K. J. Eskola and Xin-Nian Wang |
nucl-th/9307010 | Triton calculations with the new Nijmegen potentials | Triton properties are calculated using new nucleon-nucleon potentials, which
were fit to the world nucleon-nucleon data. All potentials are charge dependent
and explicitly incorporate the mass difference between the charged and neutral
pions. Three of these models have a nearly optimal chi**2 per degree of freedom
and ... | 1993-07-09 | 2009-10-22 | [
"nucl-th"
] | J.L. Friar, G.L. Payne, V.G.J. Stoks, and J.J. de Swart |
nucl-th/9307007 | Color Diffusion and Conductivity in a Quark-Gluon Plasma | Color diffusion is shown to be an important dissipative property of
quark-gluon plasmas that rapidly damps collective color modes. We derive the
characteristic color relaxation time scale, $t_c\approx (3\alpha_s T
\log(m_E/m_M ))^{-1}$, showing its sensitivity to the ratio of the static color
electric and magnetic scre... | 1993-07-07 | 2009-10-09 | [
"nucl-th"
] | Alexei V. Selikhov and Miklos Gyulassy |
nucl-th/9307008 | Pion-nucleus reactions in a microscopic transport model | We analyse pion-nucleus reactions in a microscopic transport model of the BUU
type, which propagates nucleons, pions, deltas and N(1440)-resonances
explicitly in space and time. In particular we examine pion absorption and
inelastic scattering cross sections for pion kinetic energies T(pi) =85-315MeV
and various target... | 1993-07-07 | 2009-10-22 | [
"nucl-th"
] | A. Engel, W. Cassing, U. Mosel, M. Sch\"afer, Gy. Wolf, (Institut
f\"ur Theoretische Physik, Universit\"at Giessen D--35392 Giessen, Germany) |
nucl-th/9307009 | Self-consistent solution of the Schwinger-Dyson equations for the
nucleon and meson propagators | The Schwinger-Dyson equations for the nucleon and meson propagators are
solved self-consistently in an approximation that goes beyond the Hartree-Fock
approximation. The traditional approach consists in solving the nucleon
Schwinger-Dyson equation with bare meson propagators and bare meson-nucleon
vertices; the correct... | 1993-07-07 | 2008-11-26 | [
"nucl-th"
] | M.E. Bracco, A. Eiras, G. Krein and L. Wilets |
nucl-th/9307005 | Mean Field Approximation to two-subsystems: Examples | Using the Funtional Integrals Formulation is developes a self-consistent mean
field expansion to evolution operators of a system composed by two subsystems.
This is a general expansion and can be generalized for more of two subsystems,
which can be as system composed by fermions and bosons with an interaction
between t... | 1993-07-06 | 2007-05-23 | [
"nucl-th"
] | S.Cruz-Barrios |
nucl-th/9307006 | Neutron Stars and Nuclei in the Modified Relativistic Hartree
Approximation | We have examined the properties of neutron-rich matter and finite nuclei in
the modified relativistic Hartree approximation for several values of the
renormalization scale, $\mu$, around the standard choice of $\mu$ equal to the
nucleon mass $M$. Observed neutron star masses do not effectively constrain the
value of $\... | 1993-07-06 | 2009-10-22 | [
"nucl-th"
] | M. Prakash, P.J. Ellis, E.K. Heide and S. Rudaz |
nucl-th/9307004 | Effects of the final-state interaction in ($\gamma$,pn) and
($\gamma$,pp) processes | A model is presented to describe electromagnetically induced two-nucleon
emission processes in a shell-model picture. Distortions in the outgoing
nucleon waves are accounted for by performing a partial-wave expansion in a
real mean-field potential. The antisymmetry condition for the A-body
wavefunctions is shown to be ... | 1993-07-05 | 2009-10-22 | [
"nucl-th"
] | J. Ryckebusch, M. Vanderhaeghen, L. Machenil and M. Waroquier |
nucl-th/9307003 | The Single-Particle Spectral Function of $^{16}{\rm O}$ | The influence of short-range correlations on the $p$-wave single-particle
spectral function in $^{16}{\rm O}$ is studied as a function of energy. This
influence, which is represented by the admixture of high-momentum components,
is found to be small in the $p$-shell quasihole wave functions. It is therefore
unlikely th... | 1993-07-02 | 2008-11-26 | [
"nucl-th"
] | H. M\"uther and W.H. Dickhoff |
nucl-th/9307002 | Absorption mechanisms in photon induced two-body knockout | Calculations have been performed for the $^{16}$O($\gamma$,pn) and the
$^{16}$O($\gamma$,pp) reaction in the photon-energy range $E_{\gamma}$ = 60-300
MeV. Besides the contribution from the more common photoabsorption on the
pionic degrees of freedom, we have investigated the influence of heavier meson
exchange ($\rho,... | 1993-07-02 | 2009-10-22 | [
"nucl-th"
] | L. Machenil, M. Vanderhaeghen, J. Ryckebusch and M. Waroquier |
nucl-th/9307001 | A Full $PF$ Shell Model Study of a~=~48 Nuclei | Exact diagonalizations with a minimally modified realistic force lead to
detailed agreement with measured level schemes and electromagnetic transitions
in $^{48}$Ca, $^{48}$Sc, $^{48}$Ti, $^{48}$V, $^{48}$Cr and $^{48}$Mn.
Gamow-Teller strength functions are systematically calculated and reproduce the
data to within th... | 1993-07-01 | 2009-10-22 | [
"nucl-th"
] | E. Caurier, A. P. Zuker, A. Poves, and G. Martinez-Pinedo |
nucl-th/9306026 | Improved Coupled Channels and R-Matrix Models: Predictions to 1 Gev | The $NN$ scattering near inelastic threshold is sensitive to the long-range
diagonal interaction in the produced isobar channel. Earlier models included
meson exchange potentials in the $NN$ sector and connecting that sector to
isobar channels, as well as an $R$-matrix description of short-range quark
effects. Includin... | 1993-06-29 | 2007-05-23 | [
"nucl-th"
] | P. LaFrance, E. L. Lomon, and M. Aw |
nucl-th/9306025 | Proton halo of $^8$B in a microscopic model | The experimentally predicted existence of a proton halo in $^8$B is confirmed
by dynamical microscopic multiconfiguration cluster model calculations. The
thickness of the proton halo in $^8$B is 0.5 $fm$ while in $^8$Li a 0.4 $fm$
thick neutron halo has been found. It is shown that the huge quadrupole moment
of $^8$B p... | 1993-06-29 | 2009-10-22 | [
"nucl-th"
] | Attila Csoto |
nucl-th/9306024 | A Collective Model of Baryons | We propose an algebraic description of the geometric structure of baryons in
terms of the algebra $U(7)$. We construct a mass operator that preserves the
threefold permutational symmetry and discuss a collective model of baryons with
the geometry of an oblate top. | 1993-06-27 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | R. Bijker, F. Iachello and A. Leviatan |
nucl-th/9306023 | Microscopic multicluster description of neutron-halo nuclei with a
stochastic variational method | To test a multicluster approach for halo nuclei, we give a unified
description for the ground states of $^6$He and $^8$He in a model comprising an
$\alpha$ cluster and single-neutron clusters. The intercluster wave function is
taken a superposition of terms belonging to different arrangements, each
defined by a set of ... | 1993-06-25 | 2009-10-22 | [
"nucl-th"
] | K. Varga, Y. Suzuki and R. G. Lovas |
nucl-th/9306022 | Iterative Solution for Effective Interactions in a System with
Non-degenerate Unperturbed Energies | We generalize the Lee-Suzuki iteration method for summing the folded diagram
series to the case where the unperturbed model-space energies are
non-degenerate. A condition is derived for the convergence of the iteration
scheme and this depends on the choice of the model space projection operators.
Two choices are examin... | 1993-06-23 | 2009-10-22 | [
"nucl-th"
] | K. Suzuki, R. Okamoto, P.J. Ellis and T.T.S. Kuo |
nucl-th/9306021 | A Quark Transport Theory to describe Nucleon--Nucleon Collisions | On the basis of the Friedberg-Lee model we formulate a semiclassical
transport theory to describe the phase-space evolution of nucleon-nucleon
collisions on the quark level. The time evolution is given by a Vlasov-equation
for the quark phase-space distribution and a Klein-Gordon equation for the
mean-field describing ... | 1993-06-22 | 2009-10-22 | [
"nucl-th"
] | U. Kalmbach, T. Vetter, T. S. Biro and U. Mosel (Institut fuer
Theoretische Physik, Universitaet Giessen 35392 Giessen, West Germany) |
nucl-th/9306020 | Antiproton Production in p-Nucleus and Nucleus-Nucleus Collisions within
a Relativistic Transport Approach | The production of antiprotons in proton-nucleus and nucleus-nucleus reactions
is calculated within the relativistic BUU approach employing proper
selfenergies for the baryons and antiprotons and treating the p-bar
annihilation nonperturbatively. The differential cross section for the
antiprotons is found to be very sen... | 1993-06-21 | 2009-10-22 | [
"nucl-th"
] | Stefan Teis, Wolfgang Cassing, Tomoyuki Maruyama and Ulrich Mosel
(Institut fuer Theoretische Physik, Universitaet Giessen D-35392 Giessen,
Germany) |
nucl-th/9306019 | Charge-Symmetry Breaking, Rho-Omega Mixing and the Quark Propagator | The momentum-dependence of the $\rho^0$-$\omega$ mixing contribution to
charge-symmetry breaking (CSB) in the nucleon-nucleon interaction is compared
in a variety of models. We focus in particular on the role that the structure
of the quark propagator plays in the predicted behaviour of the
$\rho^0$-$\omega$ mixing amp... | 1993-06-18 | 2009-10-22 | [
"nucl-th"
] | G. Krein, A.W. Thomas and A.G. Williams |
nucl-th/9306018 | Algebraic Treatment of Collective Excitations in Baryon Spectroscopy | We present an algebraic U(7) model for baryons which encompasses both
single-particle and collective forms of quark dynamics. The mass operator by
construction preserves the permutation symmetry between identical quarks. The
underlying geometric structure of baryons is discussed in terms of a rigid
rotating and vibrati... | 1993-06-17 | 2007-05-23 | [
"nucl-th"
] | R. Bijker and A. Leviatan |
nucl-th/9306017 | Thermo Field Dynamics and Kinetic Coefficients of a Charged Boson Gas | Thermo Field Dynamics for inhomogeneous systems is generalized to quantum
fields with a continuous single-particle mass spectrum. The modification of the
hamiltonian in states with a local thermal Bogoliubov symmetry is used to
calculate thermal conductivity and diffusion coefficient of pions interacting
with hot, comp... | 1993-06-17 | 2009-10-22 | [
"nucl-th"
] | P.A.Henning |
nucl-th/9306016 | Selfconsistent Description of a Thermal Piongas | We examine a hot pion gas by including medium modifications of the two-body
scattering amplitude as well as mean-field effects selfconsistently. In
contrast to earlier calculations, the in-medium T-matrix is rather close to the
free one while the mean-field potential agrees well with lowest-order
estimates. We also dis... | 1993-06-16 | 2009-10-22 | [
"nucl-th"
] | R. Rapp and J. Wambach |
nucl-th/9306015 | Exotic Heavy Baryons at LHC? | We speculate about a heavy bottom-charm six-quark baryon. A semiclassical and
a gaussian estimate reveal that the octet-octet bbb-ccc configuration can be
energetically favored with respect to the singlet-singlet one. This result
suggests that a confined bbb-ccc six-quark state may exist. Such objects may be
produced i... | 1993-06-15 | 2007-05-23 | [
"nucl-th"
] | T.S.Biro and J.Zimanyi |
nucl-th/9306014 | Minimizing Effective Many-Body Interactions | A simple two-level model is developed and used to test the properties of
effective interactions for performing nuclear structure calculations in
truncated model spaces. It is shown that the effective many-body interactions
sensitively depend on the choice of the single-particle basis and they appear
to be minimized whe... | 1993-06-14 | 2009-10-22 | [
"nucl-th"
] | B. R. Barrett, D. C. Zheng, R. J. McCarthy and J. P. Vary |
nucl-th/9306013 | Generalized transparency in semi-inclusive processes | It is argued that the transparency of a medium for passage of a nucleon,
knocked-out in a semi-inclusive $(e,e'p)$ reaction and subsequently scattered
elastically, is not the same as the one measured in purely elastic scattering.
Expressions are given for the properly generalized transparency and those are
compared wit... | 1993-06-13 | 2009-10-22 | [
"nucl-th"
] | A.S. Rinat and B.K. Jennings |
nucl-th/9306012 | Dirac sea effects in $K^+$ scattering from nuclei | The ratio $R_T$ of $K^+-^{12}C$ to $K^+-d$ cross sections has been calculated
microscopically using a boson-exchange $KN$ amplitude in which the $\sigma$ and
$\omega$ mesons are dressed by the modifications of the Dirac sea in nuclear
matter. In spite of the fact that this dressing leads to a scaling of the
mesons effe... | 1993-06-11 | 2011-08-17 | [
"nucl-th"
] | J.C. Caillon and J. Labarsouque |
nucl-th/9306011 | Levinson's Theorem for Dirac Particles | Levinson's theorem for Dirac particles constraints the sum of the phase
shifts at threshold by the total number of bound states of the Dirac equation.
Recently, a stronger version of Levinson's theorem has been proven in which the
value of the positive- and negative-energy phase shifts are separately
constrained by the... | 1993-06-10 | 2008-11-26 | [
"nucl-th",
"hep-th"
] | J. Piekarewicz |
nucl-th/9306010 | Exact response of the non-relativistic harmonic oscillator | Using Green$'$s function and operator techniques we give a closed expression
for the response of a non-relativistic system interacting through confining,
harmonic forces. The expression for the incoherent part permits rapid
evaluation of coefficients in a 1/q expansion. A comparison is made with
standard approximation ... | 1993-06-10 | 2009-10-22 | [
"nucl-th"
] | E. Pace, G. Salme and A.S. Rinat |
nucl-th/9306009 | Relativistic three-particle scattering equations | We derive a set of relativistic three-particle scattering equations in the
three-particle c.m. frame employing a relativistic three-particle propagator
suggested long ago by Ahmadzadeh and Tjon in the c.m. frame of a two-particle
subsystem. We make the coordinate transformation of this propagator from the
c.m. frame of... | 1993-06-08 | 2008-11-26 | [
"nucl-th"
] | Sadhan K. Adhikari, Lauro Tomio, and T. Frederico |
nucl-th/9306005 | Alpha scattering and capture reactions in the A = 7 system at low
energies | Differential cross sections for $^3$He-$\alpha$ scattering were measured in
the energy range up to 3 MeV. These data together with other available
experimental results for $^3$He $+ \alpha$ and $^3$H $+ \alpha$ scattering were
analyzed in the framework of the optical model using double-folded potentials.
The optical po... | 1993-06-07 | 2008-11-26 | [
"nucl-th"
] | P. Mohr, H. Abele, R. Zwiebel, G. Staudt, H. Krauss, H. Oberhummer, A.
Denker, J.W. Hammer, G. Wolf |
nucl-th/9306006 | Simple relativistic model of a finite-size particle | Soluble model of a relativistic particle describing a bag of matter with
fixed radius held together in perfect balance by a self-consistent combination
of three forces generated by electromagnetic and massive scalar and vector
fields is presented. For realistic values of parameters the bag radius becomes
that of a prot... | 1993-06-07 | 2011-07-19 | [
"nucl-th"
] | Iwo Bialynicki-Birula |
nucl-th/9306008 | Non-Linear Mean Field Dynamics in the Nuclear Spinodal Zone | We demonstrate, by numerical simulations, that the dynamics of nuclear matter
mean field inside the spinodal region is chaotic. Spontaneous symmetry-breaking
- no explicit fluctuating term is considered - occurs leading to wild
unpredictable density fluctuations. A proper recipe to calculate an average
Lyapunov exponen... | 1993-06-07 | 2009-10-22 | [
"nucl-th"
] | G.F. Burgio, M. Baldo and A. Rapisarda |
nucl-th/9306007 | Correlation Effects in the Final-State Interaction for Quasielastic
$(e,e'p)$ Scattering | Color transparency predicts that, in $(e,e'p)$ reactions at large $Q^2$, the
final-state interaction becomes weaker than the reference value predicted from
the free-nucleon cross section. This reference value is usually evaluated in
the dilute-gas approximation to Glauber's multiple-scattering theory. We derive
the lea... | 1993-06-07 | 2009-10-22 | [
"nucl-th"
] | N.N.Nikolaev, A.Szczurek, J.Speth, J.Wambach, B.G.Zakharov, V.R.Zoller |
nucl-th/9306004 | Dilepton Production in Nucleon-Nucleon Reactions With and Without
Hadronic Inelasticities | We calculate elementary proton-proton and neutron-proton bremsstrahlung and
their contribution to the $e^+e^-$ invariant mass distribution. At 4.9 GeV, the
proton-proton contribution is larger than neutron-proton, but it is small
compared to recent data. We then make a first calculation of bremsstrahlung in
nucleon-nuc... | 1993-06-04 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | Kevin Haglin and Charles Gale |
nucl-th/9306002 | Hamiltonian Dynamics of Yang-Mills Fields on a Lattice | We review recent results from studies of the dynamics of classical Yang-Mills
fields on a lattice. We discuss the numerical techniques employed in solving
the classical lattice Yang-Mills equations in real time, and present results
exhibiting the universal chaotic behavior of nonabelian gauge theories. The
complete spe... | 1993-06-02 | 2008-11-26 | [
"nucl-th",
"hep-lat",
"hep-th"
] | T.S. Biro, C. Gong, B. Mueller, and A. Trayanov |
nucl-th/9306003 | Multiple Collisions and Induced Gluon Bremsstrahlung in QCD | Induced soft gluon bremsstrahlung associated with multiple collisions is
calculated via perturbative QCD. We derive the non-abelian analog of the
Landau-Pomeranchuk effect that suppresses induced soft radiation with formation
times exceeding the mean free path, $\lambda$. The dependence of the
suppression effect on the... | 1993-06-02 | 2009-10-09 | [
"nucl-th",
"hep-ph"
] | Mikols Gyulassy and Xin-Nian Wang |
nucl-th/9306001 | From Skyrmions to NN phaseshifts | We study the $NN$ phaseshifts in a Hamiltonian obtained from quantization of
the collective modes in the Skyrme model. We show that a combination of an
adiabatic and diabatic approximation gives a good $NN$ force, with sufficient
attraction to produce a bound deuteron. The description of the repulsive core
appears to b... | 1993-06-02 | 2008-11-26 | [
"nucl-th"
] | Niels R. Walet |
nucl-th/9305017 | Momentum and Coordinate Space Three-nucleon Potentials | In this paper we give explicit formulae in momentum and coordinate space for
the three-nucleon potentials due to $\rho$ and $\pi$ meson exchange, derived
from off-mass-shell meson-nucleon scattering amplitudes which are constrained
by the symmetries of QCD and by the experimental data. Those potentials have
already bee... | 1993-05-31 | 2008-11-26 | [
"nucl-th"
] | S. A. Coon, M. T. Pena |
nucl-th/9305016 | Quantum Interference Effects in N* Electroproduction and Propagation in
Nuclei | We discuss the unexpected enhancement of the $N^*$ electroproduction on
nuclei recently observed in the $(\gamma^*,p\pi^-)$ measurement. A mechanism
which is able to explain this result is proposed. To clarify the situation, we
suggest to perform a new kind of experiment within well specified kinematic
conditions. | 1993-05-27 | 2008-11-26 | [
"nucl-th"
] | A. Bianconi, S. Boffi and D.E. Kharzeev |
nucl-th/9305015 | Temperature induced alignment in hot rotating nuclei | Employing a cranking Hamiltonian, in the static path approximation to the
partition function, we have studied the behaviour of the moment of inertia of
$^{64}Zn$ at a few values of temperatures as a function of the rotation
frequency. At a low temperature T = 0.5 MeV and J=16 rotational alignment of
$0g_{9/2}$ orbitals... | 1993-05-20 | 2009-10-22 | [
"nucl-th"
] | B. K. Agrawal and A. Ansari |
nucl-th/9305014 | Three-Nucleon Force and the $\Delta$-Mechanism for Pion Production and
Pion Absorption | The description of the three-nucleon system in terms of nucleon and $\Delta$
degrees of freedom is extended to allow for explicit pion production
(absorption) from single dynamic $\Delta$ de-excitation (excitation) processes.
This mechanism yields an energy dependent effective three-body hamiltonean. The
Faddeev equati... | 1993-05-20 | 2008-11-26 | [
"nucl-th"
] | M. T. Pe\~na, P. U. Sauer, A. Stadler, and G. Kortemeyer |
nucl-th/9305012 | Collective Dipole Oscillations in Atomic Nuclei and Small Metal
Particles | (The systematics of photon absorption cross sections in nuclei and small
metal particles are examined as a function of the number of constituent
fermions $A$. It is pointed out that the shell-structure-linked oscillations in
the full width at half maximum (FWHM) of the photoneutron cross section in
nuclei, earlier reco... | 1993-05-19 | 2016-09-08 | [
"nucl-th",
"cond-mat"
] | R. S. Bhalerao and M. Barma |
nucl-th/9305013 | Proof of stability of the hydrogen molecule | We sketch two rigorous proofs of the stability of the hydrogen molecule in
quantum mechanics. The first one is based on an extrapolation of variational
estimates of the groundstate energy of a positronium molecule to arbitrary mass
ratios. The second one is an extension of Heitler-London theory to nuclei of
finite mass... | 1993-05-19 | 2016-08-14 | [
"nucl-th"
] | J.M. Richard, J. Fr\"ohlich, G.M. Graf and M. Seifert |
nucl-th/9305011 | A Theorem on Light-Front Quantum Models | I give a sufficient condition for a relativistic front-form quantum
mechanical model to be scattering equivalent (unitarily equivalent with the
same S-matrix elements) to a relativistic front-form quantum model with an
interaction-independent front-form spin. | 1993-05-18 | 2009-10-22 | [
"nucl-th",
"hep-ph"
] | Wayne N. Polyzou |
nucl-th/9305010 | Relativistic meson spectroscopy | In this paper a relativistic quantum theory introduced by de Groot and
\mbox{Ruijgrok} in 1975, is used as a quark model in momentum space. The
complete spectrum, with the exception of the selfconjugate light unflavoured
mesons, is calculated. The potential used consists of an one-gluon-exchange
(OGE) part and a confin... | 1993-05-18 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | H. Hersbach |
nucl-th/9305009 | Monte Carlo evaluation of path integrals for the nuclear shell model | We present in detail a formulation of the shell model as a path integral and
Monte Carlo techniques for its evaluation. The formulation, which linearizes
the two-body interaction by an auxiliary field, is quite general, both in the
form of the effective `one-body' Hamiltonian and in the choice of ensemble. In
particula... | 1993-05-14 | 2008-11-26 | [
"nucl-th"
] | G. H. Lang, C. W. Johnson, S. E. Koonin, and W. E. Ormand |
nucl-th/9305008 | Effective Kaon Mass in Baryonic Matter and Kaon Condensation | The effective kaon mass in dense baryonic matter is calculated based on PCAC,
current algebra and the Weinberg smoothness hypothesis. The off-shell behavior
of the K-N scattering amplitudes is treated consistently with PCAC, and the
effects of the subthreshold K-N resonances are also included. The effective
kaon mass i... | 1993-05-13 | 2009-10-22 | [
"nucl-th"
] | Hiroyuki Yabu, Shinji Nakamura, F. Myhrer, and K. Kubodera |
nucl-th/9305007 | The column vector calculus for Thermo Field Dynamics of relativistic
quantum fields | A formalism is discussed which simplifies the calculation of Feynman diagrams
at finite temperature. | 1993-05-12 | 2009-10-22 | [
"nucl-th"
] | P.A.Henning |
nucl-th/9305006 | Composition, Structure and Evolution of Neutron Stars with Kaon
Condensates | We investigate the possibility of kaon condensation in the dense interior of
neutron stars through the s--wave interaction of kaons with nucleons. We
include nucleon--nucleon interactions by using simple parametrizations of
realistic forces, and include electrons and muons in $\beta$--equilibrium. The
conditions under ... | 1993-05-11 | 2009-10-22 | [
"nucl-th",
"astro-ph"
] | V. Thorsson, M. Prakash and J. M. Lattimer |
nucl-th/9305005 | Vacuum Structures in Hamiltonian Light-Front Dynamics | Hamiltonian light-front dynamics of quantum fields may provide a useful
approach to systematic non-perturbative approximations to quantum field
theories. We investigate inequivalent Hilbert-space representations of the
light-front field algebra in which the stability group of the light-front is
implemented by unitary t... | 1993-05-10 | 2010-11-01 | [
"nucl-th",
"hep-ph"
] | F. Coester and W. Polyzou |
nucl-th/9305004 | Neural Filters for Jet Analysis | We study the efficiency of a neural-net filter and deconvolution method for
estimating jet energies and spectra in high-background reactions such as
nuclear collisions at the relativistic heavy-ion collider and the large hadron
collider. The optimal network is shown to be surprisingly close but not
identical to a linea... | 1993-05-09 | 2009-10-22 | [
"nucl-th"
] | Dawei W Dong and Miklos Gyulassy (Lawrence Berkeley Laboratory) |
nucl-th/9305001 | Localization of shadow poles by complex scaling | Through numerical examples we show that the complex scaling method is suited
to explore the pole structure in multichannel scattering problems. All poles
lying on the multisheeted Riemann energy surface, including shadow poles, can
be revealed and the Riemann sheets on which they reside can be identified. | 1993-05-05 | 2009-10-22 | [
"nucl-th"
] | Attila Csoto |
nucl-th/9305003 | Thermal properties of a rotating nucleus in a fluctuating mean field
approach | The static path approximation to the path integral representation of
partition function provides a natural microscopic basis to deal with thermal
fluctuations around mean field configurations.
Using this approach for one-dimensional cranking Hamiltonian with quadrupole-
quadrupole interaction term we have studied a f... | 1993-05-05 | 2009-10-22 | [
"nucl-th"
] | B. K. Agrawal and A. Ansari |
nucl-th/9305002 | Quark-based Description of Nuclear Matter with Simulated Annealing | We calculate ground-state properties of a many-quark system in the
string-flip model using variational Monte Carlo methods. The many-body
potential energy of the system is determined by finding the optimal grouping of
quarks into hadrons. This (optimal) assignment problem is solved by using the
stochastic optimization ... | 1993-05-05 | 2009-10-22 | [
"nucl-th"
] | George M. Frichter and J. Piekarewicz |
nucl-th/9304025 | Microscopic Calculations of the Spectra of Light Nuclei | We perform large-space shell-model calculations for the low-lying energy
spectra of a few light nuclei, $^4\mbox{He}$, $^5\mbox{He}$, $^6\mbox{Li}$ and
$^7\mbox{Li}$, in a no-core model space with a realistic effective two-body
interaction (Brueckner G-matrix). Our G-matrices are calculated for the
Reid-soft-core poten... | 1993-04-27 | 2008-11-26 | [
"nucl-th"
] | D.C. Zheng, B.R. Barrett, L. Jaqua, J.P. Vary, and R.J. McCarthy |
nucl-th/9304023 | Effects of Negative Energy Components in the Constituent Quark Model | Relativistic covariance requires that in the constituent quark model for
mesons the positive energy states as well as the negative energy states are
included. Using relativistic quasi-potential equations the contribution of the
negative energy states is studied for the light and charmonium mesons. It is
found that thes... | 1993-04-27 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | Peter C. Tiemeijer and J.A. Tjon |
nucl-th/9304024 | Approximate Particle Number Projection for Rotating Nuclei | Pairing correlations in rotating nuclei are discussed within the
Lipkin-Nogami method. The accuracy of the method is tested for the
Krumlinde-Szyma\'nski R(5) model. The results of calculations are compared with
those obtained from the standard mean field theory and particle-number
projection method, and with exact sol... | 1993-04-27 | 2008-11-26 | [
"nucl-th"
] | P. Magierski, S. \'Cwiok, J. Dobaczewski, and W. Nazarewicz |
nucl-th/9304022 | Comment on "Comparison of Potential Models with the PP Scattering Data
Below 350 Mev" | We point out two flaws in the recent test of nucleon-nucleon (NN) potentials
conducted by Stoks and de Swart. First, in some cases, the neutron-proton
($np$) version of an NN potential was compared to the proton-proton ($pp$)
data, which is improper and yields (large) $\chi^2$ that are essentially
meaningless. Second, ... | 1993-04-27 | 2007-05-23 | [
"nucl-th"
] | G. Q. Li and R. Machleidt (University of Idaho) |
nucl-th/9304021 | The Off Shell $\rho$-$\omega$ Mixing in the QCD Sum Rules | The $q^2$ dependence of the $\rho-\omega$ mixing amplitude is analyzed with
the use of the QCD sum rules and the dispersion relation. Going off shell the
mixing decreases, changes sign at $q^2 \simeq 0.4 m_{\rho}^2 > 0$ and is
negative in the space like region. Implications of this result to the isospin
breaking part o... | 1993-04-26 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | T. Hatsuda, E.M. Henley, Th. Meissner and G. Krein |
nucl-th/9304020 | No-Lose `Theorem' for Parity Violating Nucleon-Nucleon Scattering
Experiments | A purely left-chiral model of the weak interactions is used to show that the
total parity-violating asymmetry in quark-quark scattering must grow with
increasing energy. In the absence of other new physics, non-observation of a
large asymmetry can therefore be used to infer an upper bound on the mass scale
for new righ... | 1993-04-25 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | T. Goldman |
nucl-th/9304019 | Supershell Effect and Stability of Classical Periodic Orbits in
Reflection-Asymmetric Superdeformed Oscillator | A semiclassical analysis is made of the origin of an undulating pattern in
the smoothed level density for a reflection-asymmetric superdeformed oscillator
potential. It is suggested that, when the octupole-type deformation increases,
an interference effect between two families of periodic orbit with the ratio of
period... | 1993-04-23 | 2023-02-06 | [
"nucl-th"
] | Ken-ichiro Arita |
nucl-th/9304018 | Electromagnetic Dipole Response as a Test of the $^{\bf 11}$Li g.s.
Structure and the n-$^{\bf 9}$Li Interaction | The electric dipole response of the halo nucleus $^{11}$Li is calculated in a
hyperspherical three-body formulation, and is studied as a function of the
interaction employed for $n-^9$Li to reflect the Pauli principle. Strength
concentrations at lower energies are found but no narrow resonances. Only one
possible scena... | 1993-04-23 | 2007-05-23 | [
"nucl-th"
] | B.V. Danilin, M.V. Zhukov, J.S.Vaagen, I.J.Thompson, J.M.Bang |
nucl-th/9304017 | Quasielastic neutrino scattering from oxygen and the atmospheric
neutrino problem | We examine several phenomena beyond the scope of Fermi-gas models that affect
the quasielastic scattering (from oxygen) of neutrinos in the 0.1 -- 3.0 GeV
range. These include Coulomb interactions of outgoing protons and leptons, a
realistic finite-volume mean field, and the residual nucleon-nucleon
interaction. None o... | 1993-04-22 | 2010-11-01 | [
"nucl-th",
"hep-ph"
] | J.Engel, E. Kolbe, K. Langanke, P. Vogel |
nucl-th/9304015 | Colour transparency: a novel test of QCD in nuclear interactions | Colour transparency is a cute and indispensable property of QCD as the gauge
theory of strong interaction. CT tests of QCD consist of production of the
perturbative small-sized hadronic state and measuring the strngth of its
non-perturbative diffraction nteraction in a nuclear matter. The energy
depenednce of the final... | 1993-04-20 | 2015-06-26 | [
"nucl-th"
] | N.N.Nikolaev |
nucl-th/9304014 | Nucleon polarization in deuteron electrodisintegration | Outgoing nucleon polarization in exclusive deuteron electrodisintegration is
studied at the quasi-elastic peak in the standard theory with emphasis on the
effect of nucleonic and pionic relativistic corrections. The cases of polarized
beam or/and polarized target are considered. Sizeable relativistic effects are
pointe... | 1993-04-20 | 2008-11-26 | [
"nucl-th"
] | B. Mosconi, J. Pauschenwein and P. Ricci |
nucl-th/9304016 | Color Magnetic Corrections to Quark Model Valence Distributions | We calculate order $\alpha_s$ color magnetic corrections to the valence quark
distributions of the proton using the Los Alamos Model Potential wavefunctions.
The spin-spin interaction breaks the model SU(4) symmetry, providing a natural
mechanism for the difference between the up and down distributions. For a value
of ... | 1993-04-20 | 2008-11-26 | [
"nucl-th"
] | C.J. Benesh, T.Goldman, and G.J. Stephenson Jr |
nucl-th/9304013 | Electromagnetic Scattering from Relativistic Bound States | The quasipotential formalism for elastic scattering from relativistic bound
states is formulated based on the instant constraint in the Breit frame. The
quasipotential electromagnetic current is derived from Mandelstam's five-point
kernel and obeys a two-body Ward identity. Breit-frame wave functions are
obtained direc... | 1993-04-17 | 2008-11-26 | [
"nucl-th"
] | N. K. Devine and S. J. Wallace |
nucl-th/9304011 | Determination of Dipole Polarization Effects in $^7$Li and $^{11}$Li | The structure of $^6$Li, $^7$Li and $^{11}$Li nuclei is investigated in a
model space which includes all configurations with oscillator energy up to
$3\hbar\omega$ above the ground state configuration. The energy spectra and
electromagnetic properties of the low-lying states are determined with various
two-body interac... | 1993-04-15 | 2009-10-22 | [
"nucl-th"
] | L.D. Skouras, H. M\"uther, M.A. Nagarajan |
nucl-th/9304012 | Semi-Classical Description of Antiproton Capture on Atomic Helium | A semi-classical, many-body atomic model incorporating a momentum-dependent
Heisenberg core to stabilize atomic electrons is used to study antiproton
capture on Helium. Details of the antiproton collisions leading to eventual
capture are presented, including the energy and angular momentum states of
incident antiproton... | 1993-04-15 | 2009-10-22 | [
"nucl-th"
] | W. A. Beck, L. Wilets and M. A. Alberg |
nucl-th/9304010 | Model Analysis of Time Reversal Symmetry Test in the Caltech Fe-57
Gamma-Transition Experiment | The CALTECH gamma-transition experiment testing time reversal symmetry via
the E2/M1 mulipole mixing ratio of the 122 keV gamma-line in Fe-57 has already
been performed in 1977. Extending an earlier analysis in terms of an effective
one-body potential, this experiment is now analyzed in terms of effective one
boson exc... | 1993-04-13 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | Michael Beyer |
nucl-th/9304009 | Maximum Azimuthal Anisotropy of Neutrons from Nb-Nb Collisions at 400
AMeV and the Nuclear Equation of State | We measured the first azimuthal distributions of triple--differential cross
sections of neutrons emitted in heavy-ion collisions, and compared their
maximum azimuthal anisotropy ratios with Boltzmann--Uehling--Uhlenbeck (BUU)
calculations with a momentum-dependent interaction. The BUU calculations agree
with the triple... | 1993-04-13 | 2009-10-22 | [
"nucl-th"
] | M. Elaasar, R. Madey, W. M. Zhang, J. Schambach, D. Keane, B. D.
Anderson, A. R. Baldwin, J.W. Watson, G. D. Westfall, G. Krebs, H. Wieman, C.
Gale and K. Haglin |
nucl-th/9304007 | Chiral Baryon with Quantized Pions | We study a hybrid chiral model for the nucleon based on the linear sigma
model with explicit quarks. We solve the model using a Fock-space configuration
consisting of three quarks plus three quarks and a pion as the ground state
ansatz in place of the ``hedgehog'' ansatz. We minimize the expectation value
of the chiral... | 1993-04-08 | 2007-05-23 | [
"nucl-th"
] | J. A. McNeil and C. E. Price |
nucl-th/9304006 | Diagonalization of full finite temperature Green's function by
quasi-particles | For thermal systems, standard perturbation theory breaks down because of the
absence of stable, observable asymptotic states. We show, how the introduction
of {\it statistical} quasi-particles (stable, but not observable) gives rise to
a consistent description. Statistical and spectral information can be cleanly
separa... | 1993-04-08 | 2009-10-22 | [
"nucl-th"
] | P.A.Henning and H.Umezawa |
nucl-th/9304008 | Nuclear Flow Excitation Function | We consider the dependence of collective flow on the nuclear surface
thickness in a Boltzmann--Uehling--Uhlenbeck transport model of heavy ion
collisions. Well defined surfaces are introduced by giving test particles a
Gaussian density profile of constant width. Zeros of the flow excitation
function are as much influen... | 1993-04-08 | 2008-11-26 | [
"nucl-th"
] | D. Klakow, G. Welke, and W. Bauer |
nucl-th/9304005 | The Delta-Hole model at Finite Temperature | The spectral function of pions interacting with a gas of nucleons and
Delta-33-resonances is investigated using the formalism of Thermo Field
Dynamics. After a discussion of the zero Delta-width approximation at finite
temperature, we take into account a constant width of the resonance. Apart from
a full numerical calc... | 1993-04-08 | 2009-10-22 | [
"nucl-th"
] | P.A.Henning and H.Umezawa |
nucl-th/9304003 | Collective Modes in a Slab of Interacting Nuclear Matter: The effects of
finite range interactions | We consider a slab of nuclear matter and investigate the collective
excitations, which develop in the response function of the system. We introduce
a finite-range realistic interaction among the nucleons, which reproduces the
full G-matrix by a linear combination of gaussian potentials in the various
spin-isospin chann... | 1993-04-06 | 2015-06-26 | [
"nucl-th"
] | W.M. Alberico, P. Czerski, A. De Pace and V.R. Manfredi |
nucl-th/9304002 | The Pion in Electromagnetic and Weak Neutral Current Nuclear Response
Functions | The impact of pionic correlations and meson--exchange currents in determining
the (vector) response functions for electroweak quasielastic lepton scattering
from nuclei is discussed. The approach taken builds on previous work where the
Fermi gas model is used to maintain consistency in treating forces and currents
(gau... | 1993-04-06 | 2009-10-22 | [
"nucl-th"
] | W.M. Alberico, M.B. Barbaro, A. De Pace, T.W. Donnelly and A. Molinari |
nucl-th/9304004 | Role of heavy-meson exchange in pion production near threshold | Recent calculations of $s$-wave pion production have severely underestimated
the accurately known $pp\rightarrow pp\pi^0$\ total cross section near
threshold. In these calculations, only the single-nucleon axial-charge operator
is considered. We have calculated, in addition to the one-body term, the
two-body contributi... | 1993-04-06 | 2008-11-26 | [
"nucl-th"
] | C. J. Horowitz, H. O. Meyer and D. Griegel |
nucl-th/9304001 | Nambu-Jona-Lasinio Models Beyond the Mean Field Approximation | Inspired by the model of Nambu and Jona-Lasinio, various Lagrangians are
considered for a system of interacting quarks. Employing standard techniques of
many-body theory, the scalar part of the quark self-energy is calculated
including terms up to second-order in the interaction. Results obtained for the
single-particl... | 1993-04-01 | 2008-11-26 | [
"nucl-th"
] | P. Domitrovich, D. B\"uckers, H. M\"uther |
nucl-th/9303026 | Boson-fermion mappings for odd systems from supercoherent states | We extend the formalism whereby boson mappings can be derived from
generalized coherent states to boson-fermion mappings for systems with an odd
number of fermions. This is accomplished by constructing supercoherent states
in terms of both complex and Grassmann variables. In addition to a known
mapping for the full so(... | 1993-03-31 | 2008-11-26 | [
"nucl-th",
"hep-th"
] | J. Dobaczewski, F.G. Scholtz, and H.B. Geyer |
nucl-th/9303025 | Gauge Invariance and the Electromagnetic Current of Composite Pions | The Global Color-symmetry Model of QCD is extended to deal with a background
electromagnetic field and the associated conserved current is identified for
composite $\bar{q}q$ pion modes of the model. Although the analysis is limited
to tree level in the bilocal fields that bosonize the model, the identified
photon-pion... | 1993-03-30 | 2008-11-26 | [
"nucl-th"
] | M.R. Frank and P.C.Tandy |
nucl-th/9303024 | Light front dynamics and the binding correction | It is shown that the nuclear binding correction in deep inelastic lepton
scattering is essentially the same in light front and instant form
representations. Some contradicting papers are discussed. | 1993-03-29 | 2007-05-23 | [
"nucl-th"
] | S.V.Akulinichev |
nucl-th/9303023 | Correlations in Nuclei: Self-Consistent Treatment and the BAGEL Approach | An approach is presented which allows a self-consistent description of the
fragmentation of single-particle strength for nucleons in finite nuclei
employing the Greens function formalism. The self-energy to be considered in
the Dyson equation for the single-particle Greens function contains all terms
of first (Hartree-... | 1993-03-29 | 2009-10-22 | [
"nucl-th"
] | H. M\"uther and L.D. Skouras |
nucl-th/9303022 | Comment on Neutron-Proton Spin-Correlation Parameter A_{ZZ} at 68 Mev | We present two arguments indicating that the large value for the $\epsilon_1$
mixing parameter at 50 MeV, which the Basel group extracted from their recent
$A_{zz}$ measurement, may be incorrect. First, there are nucleon-nucleon (NN)
potentials which predict the $\epsilon_1$ at 50 MeV substantially below the
Basel valu... | 1993-03-27 | 2009-10-22 | [
"nucl-th"
] | R. Machleidt and I. Slaus |
nucl-th/9303018 | Dirac Hartree-Fock for Finite Nuclei Employing realistic Forces | We discuss two different approximation schemes for the self-consistent
solution of the {\it relativistic} Brueckner-Hartree-Fock equation for finite
nuclei. In the first scheme, the Dirac effects are deduced from corresponding
nuclear matter calculations, whereas in the second approach the local-density
approximation i... | 1993-03-26 | 2009-10-22 | [
"nucl-th"
] | R.Fritz H.M\"uther and R.Machleidt |
nucl-th/9303019 | On the Spectacular Large Asymmetry in $\pbarppipi$ and $\pbarpKK$
Reactions} | An illustrative analysis is presented to show the origin of the
energy-independent maximal asymmetry observed for wide ranges of angles in the
reactions $\pbarppipi$ and $\pbarpKK$. % The general nature of our simple
relation between helicity -flip and -nonflip partial wave amplitudes enforces
the notion that % these f... | 1993-03-26 | 2019-08-17 | [
"nucl-th"
] | S. Takeuchi, F. Myhrer and K. Kubodera (Department of Physics and
Astronomy, University of South Carolina, Columbia, SC29208) |
nucl-th/9303020 | Exclusive Hadronic Reactions at High $Q^2$ ($90\degree$) and
Polarization Phenomena, An Experimental Proposal} | Arguments are presented for the expected behaviour of $\piNpiN$ scattering
and the $\pbarppipi$ reaction at high energy and large scattering angles. % The
annihilation reaction has close to maximal asymmetry ($\approx$ 1) for $p_{lab}
\siml $ 2.2 GeV/c. % As will be presented for fixed (90$\degree$) angle this
large as... | 1993-03-26 | 2007-05-23 | [
"nucl-th"
] | F. Myhrer (Department of Physics and Astronomy, University of South
Carolina, Columbia, SC29208) |
nucl-th/9303021 | The Quasi-Elastic Nuclear Response | We explore the nuclear responses at intermediate energies, particularly in
the spin longitudinal and spin transverse isovector channels, within the
continuum random phase approximation framework. We also employ an extension of
the standard random phase approximation to account for the spreading width of
the single part... | 1993-03-26 | 2009-09-25 | [
"nucl-th"
] | A. De Pace and M. Viviani |
nucl-th/9303017 | Quantum theory of large amplitude collective motion and the
Born-Oppenheimer method | We study the quantum foundations of a theory of large amplitude collective
motion for a Hamiltonian expressed in terms of canonical variables. In previous
work the separation into slow and fast (collective and non-collective)
variables was carried out without the explicit intervention of the Born
Oppenheimer approach. ... | 1993-03-20 | 2008-11-26 | [
"nucl-th"
] | Abraham Klein and Niels R. Walet |
nucl-th/9303015 | Probing Hadronic Structure with The Decay $\Delta\rightarrow Nl^+l^-$ | We compute the branching ratio for $\Delta\rightarrow Ne^+e^-$ and
$\Delta\rightarrow N\mu^+\mu^-$ in chiral perturbation theory and find that
both decays should be observable at CEBAF. With sufficiently low thresholds on
the $e^+e^-$ invariant mass a branching ratio of $\sim 10^{-5}$ may be observed
for $\Delta\righta... | 1993-03-18 | 2008-11-26 | [
"nucl-th"
] | Malcolm N. Butler, Martin J. Savage, Roxanne P. Springer |
nucl-th/9303016 | Nuclear effects in Deep Inelastic Scattering of polarized electrons off
polarized 3He and the neutron spin structure functions | It is shown that the nuclear effects playing a relevant role in Deep
Inelastic Scattering of polarized electrons by polarized $^3$He are mainly
those arising from the effective proton and neutron polarizations generated by
the $S'$ and $D$ waves in $^3$He. A simple and reliable equation relating the
neutron, $g_1^n$, a... | 1993-03-18 | 2008-11-26 | [
"nucl-th"
] | C.Ciofi degli Atti, S.Scopetta, E.Pace, G.Salme |
nucl-th/9303013 | Angular Momentum Analysis of Spin 1/2 x 1/2 Scattering including
Singlet-Triplet Mixing | The angular momentum (partial wave) reduction of the Lippmann--Schwinger
equation describing the interaction of two spin 1/2 particles is extended to
the case in which the spin singlet and triplet states are coupled. A straight
forward method for obtaining the angular momentum decomposition of the general
potential is ... | 1993-03-18 | 2009-09-25 | [
"nucl-th"
] | T. Mefford and R. H. Landau |
nucl-th/9303014 | Critical test of multi-{\it j} supersymmetries from magnetic moment
measurements | Magnetic moment measurements in odd nuclei directly probe the distribution of
fermion states and hence provide one of the most critical tests for multi-$j$
supersymmetries in collective nuclei. Due to complexity of calculations and
lack of data, such tests have not been performed in the past. Using the
Mathematica soft... | 1993-03-18 | 2008-11-26 | [
"nucl-th"
] | Serdar Kuyucak and Andrew E. Stuchbery |
nucl-th/9303012 | Left-Right Asymmetry in $\bar{p}p \rightarrow \pi^- \pi^+$ | Results for d$\sigma$/d$\Omega$ and $A_N$ in the reaction $\bar{p}p
\rightarrow \pi^- \pi^+$ are predicted by a simple quark model. They are
compared to recent experimental data from LEAR, as well as to previous
predictions from nucleon-exchange models. At low energy the quark model does
better than the nucleon-exchang... | 1993-03-16 | 2008-11-26 | [
"nucl-th"
] | George Bathas and W.M. Kloet |
nucl-th/9303011 | Orbital M1 versus E2 strength in deformed nuclei: A new energy weighted
sum rule | Within the unified model of Bohr and Mottelson we derive the following linear
energy weighted sum rule for low energy orbital 1$^+$ excitations in even-even
deformed nuclei $$S_{\rm LE}^{\rm lew} (M_1^{\rm orb}) \cong (6/5) \epsilon
(B(E2; 0^+_1 \rightarrow 2_1^+ K=0)/Z e^2<r^2>^2) \mu^2_N$$ with B(E2) the E2
strength ... | 1993-03-16 | 2008-11-26 | [
"nucl-th"
] | E. Moya de Guerra and L. Zamick |
nucl-th/9303010 | Ghost Poles in the Nucleon Propagator: Vertex Corrections and Form
Factors | Vertex corrections are taken into account in the Schwinger-Dyson equation for
the nucleon propagator in a relativistic field theory of fermions and mesons.
The usual Hartree-Fock approximation for the nucleon propagator is known to
produce the appearance of complex (ghost) poles which violate basic theorems of
quantum ... | 1993-03-15 | 2008-11-26 | [
"nucl-th"
] | G. Krein, M. Nielsen, R.D. Puff and L. Wilets |
nucl-th/9303009 | The response of non-relativistic confined systems | We study the non-relativistic response of a 'diquark' bound by confining
forces, for which perturbation theory in the interaction fails. As
non-perturbative alternatives we consider the Gersch-Rodriguez-Smith theory and
a summation method. We show that, contrary to the case of singular repulsive
forces, the GRS theory ... | 1993-03-14 | 2008-11-26 | [
"nucl-th"
] | S.A. Gurvitz and A.S. Rinat |
nucl-th/9303007 | The neutron halo of $^6$He in a microscopic model | The two--neutron separation energy of $^6$He has been reproduced for the
first time in a realistic parameter--free microscopic multicluster model
comprising the $\alpha +n+n$ and $t+t$ clusterizations, with $\alpha$ cluster
breathing excitations included. The contribution of the $t+t$ channel is
substantial. A very thi... | 1993-03-11 | 2008-11-26 | [
"nucl-th"
] | Attila Csoto |
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