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in subjects: "Nucleon-Nucleon Interactions"

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The spin observables of electron-nucleon scattering from the formalism of nucleon-nucleon scattering

The eN scattering spin observables are derived from the long established NN scattering formalism. Some conditions on the eN observables emerge more transparently than from the specific eN calculations themselves.

Date: March 9, 1994

Creator: Conzett, H. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Limits on CP nonconserving interactions from electric dipole moments

I discuss bounds on CP-nonconserving (CPNC) and parity-nonconserving (PNC) hadronic interactions that result from measurements of atomic electric dipole moments. In most models of hadronic CPNC, the nuclear edm arises primarily from the polarization of the ground state by the CPNC PNC NN interaction, rather than from the edms of valence nucleons. When the atom is placed in an external field, the nucleus is fully shielded apart from nuclear finite size effects and relativistic corrections arisin… more

Date: September 1, 1994

Creator: Haxton, W. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Theoretical aspects of searches for time reversal violation in neutron transmission

In nonleptonic nuclear processes one can probe time reversal violating interactions which conserve flavor. The authors discuss such interactions and their manifestations in the nucleon-nucleon interaction. Among nuclear physics experiments studies of the transmission of polarized epithermal neutrons appear to be the most sensitive tools to probe for time reversal violation in the nucleon-nucleon interaction. They consider what sensitivities are required for neutron transmission experiments to o… more

Date: September 1, 1996

Creator: Herczeg, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurements of the deuteron elastic structure function A(Q{sup 2}) at the Jefferson Laboratory

Results from experiment E91-026 in Hall A at the Jefferson Laboratory are reported. The aim of this experiment was to extract the deuteron structure function A(Q{sup 2}) from the coincidence elastic electron-deuteron cross-section measurements. A squared four-momentum transfer (Q{sup 2}) range of 0.7 to 6.0 (Gev/c){sup 2} was covered. Data from this experiment improve the quality of existing data at the low end as well as significantly extend the Q{sup 2} range. The results are compared to conv… more

Date: September 1, 1998

Creator: Kuss, Michael

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quantum size effects in classical hadrodynamics

The author discusses future directions in the development of classical hydrodynamics for extended nucleons, corresponding to nucleons of finite size interacting with massive meson fields. This new theory provides a natural covariant microscopic approach to relativistic nucleus-nucleus collisions that includes automatically spacetime nonlocality and retardation, nonequilibrium phenomena, interactions among all nucleons, and particle production. The present version of the theory includes only the… more

Date: March 1, 1994

Creator: Nix, J. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Multiwire proportional chamber spectrometer for nucleon--nucleon experiments

A flexible low resolution spectrometer is being built for a program of experiments to be done at the LAMPF Nucleon Physics Lab. The bend angle of charged particles through an 18D36 magnet will be determined by multiwire proportional chambers (MWPC) with 2-mm wire spacing. The general design of the chambers and of the associated electronics for readout and encoding are discussed. Some results obtained with a prototype system are given. (auth)

Date: October 1, 1973

Creator: Werren, D.W.; Brown, D. & Fox, L.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The nuclear Thomas-Fermi model

The statistical Thomas-Fermi model is applied to a comprehensive survey of macroscopic nuclear properties. The model uses a Seyler-Blanchard effective nucleon-nucleon interaction, generalized by the addition of one momentum-dependent and one density-dependent term. The adjustable parameters of the interaction were fitted to shell-corrected masses of 1654 nuclei, to the diffuseness of the nuclear surface and to the measured depths of the optical model potential. With these parameters nuclear siz… more

Date: August 1994

Creator: Myers, W. D. & Swiatecki, W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant

We present an analysis of the gamma-ray measurements by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) Cygnus Loop (G74.0-8.5). We detect significant gamma-ray emission associated with the SNR in the energy band 0.2-100 GeV. The gamma-ray spectrum shows a break in the range 2-3 GeV. The gamma-ray luminosity is {approx} 1 x 10{sup 33} erg s{sup -1} between 1-100 GeV, much lower than those of other GeV-emitting SNRs. The mor… more

Date: November 8, 2011

Creator: Katagiri, H.; Tibaldo, L.; Ballet, J.; Giordano, F.; Grenier, I. A.; Porter, T. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theoretical nuclear physics. Progress report, July 1, 1992--June 30, 1993

This report summarizes progress during the past year in the following areas of research: the role of meson exchange currents in nuclear reactions, including vector mesons in pion DCX, and K{sup +}-nucleus cross sections. Pion excess distributions in nuclei, and the role of nuclear correlations. Inelastic electron scattering and the Coulomb sum rule. Statistical nuclear spectroscopy, including the evaluation of static densities and expectation values.

Date: June 30, 1993

Creator: Koltun, D. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Nucleon-nucleon interactions

Nucleon-nucleon interactions are at the heart of nuclear physics, bridging the gap between QCD and the effective interactions appropriate for the shell model. We discuss the current status of {ital NN} data sets, partial-wave analyses, and some of the issues that go into the construction of potential models. Our remarks are illustrated by reference to the Argonne {ital v}{sub 18} potential, one of a number of new potentials that fit elastic nucleon-nucleon data up to 350 MeV with a {Chi}{sup 2}… more

Date: December 31, 1996

Creator: Wiringa, R.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Medium energy measurements of N-N parameters. Final technical report, April 1, 1994--September 30, 1996

This document is a final technical report describing the accomplishments of the medium/high energy nuclear physics research program at the University of Texas at Austin. The research program had four main thrusts, only one of which can be considered as measurements of N-N parameters: (1) finishing the data analyses associated with recent LAMPF and TRIUMPF N-N experiments, whose overall purpose has been the determination of the nucleon-nucleon amplitudes, both for isospin 0 and 1 at medium energ… more

Date: August 1, 1998

Creator: Ambrose, D.; Betts, W.; Coffey, P.; Glass, G.; McDonough, J.; Riley, P. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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There might be two kinds of dibaryon

A new quark potential model, the quark delocalization and color screening model, is used for a systematic search of dibaryon candidates in the u, d and s three flavor world. The color screening results from unquenched lattice gauge calculations and quark delocalization similar to electron delocalization in molecular physics are included. Flavor symmetry breaking and channel coupling effects are studied. The model is constrained not only by the baryon ground state property but also by the N-N sc… more

Date: July 1, 1994

Creator: Wang, Fan; Ping, Jia-lun & Goldman, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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No-lost ``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 right-chiral weak vector bosons. Applying this idea to actual nucleon-nucleon scattering requires more involved calculations, as the dominant contribution appears to come from a compo… more

Date: May 1, 1993

Creator: Goldman, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Interactions of Antiprotons in Hydrogen, Beryllium, and Carbon

To determine the nature of the interactions between antinucleons and nucleons, it has been necessary to do an experiment in which the elastic, inelastic, and charge-exchange interactions could be measured. Improvements in the 6-Bev Bevatron have permitted production of a considerably larger flux of antiprotons, than was available in earlier studies. With the use of strong-focusing magnetic quadrupoles, a crossed electric- and magnetic-field spectrometer, and time-of-flight scintillation counter… more

Date: March 1, 1960

Creator: Cork, Bruce

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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The ups and downs of J/psi suppression

An overview of the present status of J/psi suppression in pA and nucleus-nucleus interactions is presented. In both cases, model predictions are summarized and compared to the data. The ''anomalous'' J/psi suppression in Pb+Pb collisions is discussed in some detail. Predictions are also shown for quarkonium suppression at collider energies.

Date: October 17, 2000

Creator: Vogt, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spectroscopy of few-particle nuclei around magic {sup 132}Sn from fission product {gamma}-ray studies.

We are studying the yrast structure of very neutron-rich nuclei around doubly magic {sup 132}Sn by analyzing fission product {gamma}-ray data from a {sup 248}Cm source at Eurogam II. Yrast cascades in several few-valence-particle nuclei have been identified through {gamma}{gamma} cross coincidences with their complementary fission partners. Results for two-valence-particle nuclei {sup 132}Sb, {sup 134}Te, {sup 134}Sb and {sup 134}Sn provide empirical nucleon-nucleon interactions which, combined… more

Date: July 29, 1998

Creator: Zhang, C. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Medium energy measurements of N-N parameters. Progress report: January 1, 1990--December 31, 1993

The authors report here progress made during the three year period January 1, 1990, to December 31, 1993, for the Department of Energy Three-Year Grant No. DE-FG05-88ER40446, third year. A major part of the work has been associated with nucleon-nucleon (N-N) research carried out at the Nucleon Physics Laboratory (NPL) at the Los Alamos Meson Physics Facility (LAMPF). During this period they also completed data acquisition and analyses of a TRIUMF experiment, but they have no further plans for e… more

Date: October 1, 1993

Creator: Ambrose, D.; Bachman, M.; Coffey, P.; Glass, G.; Jobst, B.; McNaughton, K. H. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Intermediate/high energy nuclear physics. Technical progress report, June 15, 1991--June 14, 1992

This report discusses progress on the following research: quark cluster model; solving quantum field theories in non-perturbative regime;relativistic wave equations, quarkonia and electron-positron resonances; nuclear dependence at large transverse momentum; factorization at the order of power corrections; single-spin asymmetries; and hadronic photon production. (LSP)

Date: July 1, 1992

Creator: Vary, J. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Resonances in the {Sigma}NN system

We first review certain unique aspects of few-body {Alpha}- hypernuclei and then explore the physics of {summation} threshold in few-body elastic scattering and reactions. In particular, we discuss a predicted enhancement in the {Alpha}d cross section near the {summation}NN threshold in terms of poles in the {Tau}=0YNN amplitude. A brief discussion of anticipated poles in the {Tau}=1 amplitudes is also given.

Date: June 1, 1993

Creator: Gibson, B. F. & Afnan, I. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A polarized look at nucleons: Laser electron gamma source

As the title suggests we are going to look at reactions induced on nucleons by polarized photons. The results I am going to show today are from the Laser Electron Gamma Source, or ``LEGS`` facility, at Brookhaven National Laboratory. At LEGS, gamma ray beams are produced by backscattering laser light from relativistic electrons. I will only summarize the main characteristics of this facility, and leave an in depth description to Dr. Schaerf who will discuss LEGS and other similar backscattering… more

Date: December 31, 1991

Creator: Collaboration, The LEGS

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ab initio shell model with a chiral-symmetry-based three-nucleon force for the p-shell nuclei

The ab initio no-core shell model (NCSM) is extended to include a realistic three-body interaction in calculations for p-shell nuclei. They present results of first applications using the Argonne V8' nucleon-nucleon (NN) potential and the Tucson-Melbourne TM'(99) three-nucleon interaction (TNI). In addition to increase of binding energy, they observe a trend toward level-ordering and level-spacing improvement in comparison to experiment. With the TNI they obtain a correct ground-state spin for … more

Date: October 14, 2003

Creator: Navratil, P; Hayes, A C; Vary, J P & Ormand, W E

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A neutron beam polarizer for study of parity violation in neutron-nucleus interactions

A dynamically-polarized proton target operating at 5 Tesla and 1 K has been built to polarize an epithermal neutron beam for studies of parity violation in compound-nuclear resonances. Nearly 0.9 proton polarization was obtained in an electron-beam irradiated ammonia target. This was used to produce a neutron beam polarization of 0.7 at epithermal energies. The combination of the polarized proton target and the LANSCE spallation neutron source produces the most intense pulsed polarized epitherm… more

Date: November 1, 1994

Creator: Penttilae, S. I.; Bowman, J. D.; Frankle, C. M.; Seestrom, S. J.; Yen, Yi-Fen; Delheij, P. P. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Particle-production mechanism in relativistic heavy-ion collisions

We discuss the production of particles in relativistic heavy-ion collisions through the mechanism of massive bremsstrahlung, in which massive mesons are emitted during rapid nucleon acceleration. This mechanism is described within the framework of classical hadrodynamics for extended nucleons, corresponding to nucleons of finite size interacting with massive meson fields. This new theory provides a natural covariant microscopic approach to relativistic heavy-ion collisions that includes automat… more

Date: July 1, 1994

Creator: Bush, B. W. & Nix, J. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Collective flow and azimuthal correlations in nucleus-nucleus collisions at the Bevalac

The EOS experiment at the Bevalac has recently carried out exclusive event-by-event measurements of relativistic heavy ion collisions with a variety of projectile, target and beam energy combinations. The data was obtained using the EOS Time Projection Chamber. We present preliminary results on inclusive spectra, collective flow and azimuthal correlations obtained from a study of Au + Au reactions with beam energies covering 0.6 {minus} 1.2 A GeV.

Date: September 1, 1993

Creator: Rai, G. & Collaboration, EOS

Item Type: Article

Partner: UNT Libraries Government Documents Department