Relativistic few body calculations

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5790261

Gross, F

A modern treatment of the nuclear few-body problem must take into account both the quark structure of baryons and mesons, which should be important at short range, and the relativistic exchange of mesons, which describes the long range, peripheral interactions. A way to model both of these aspects is described. The long range, peripheral interactions are calculated using the spectator model, a general approach in which the spectators to nucleon interactions are put on their mass-shell. Recent numerical results for a relativistic OBE model of the NN interaction, obtained by solving a relativistic equation with one-particle on mass-shell, will be presented and discussed. Two meson exchange models, one with only four mesons ({pi},{sigma},{rho},{omega}) but with a 25% admixture of {gamma}{sup 5} coupling for the pion, and a second with six mesons ({pi},{sigma},{rho},{omega},{delta},{eta}) but pure {gamma}{sup 5}{gamma}{sup {mu}} pion coupling, are shown to give very good quantitative fits to the NN scattering phase shifts below 400 MeV, and also a good description of the {rvec p} {sup 40}Ca elastic scattering observables. Applications of this model to electromagnetic interactions of the two body system, with emphasis on the determination of relativistic current operators consistent with the dynamics and the exact treatment of current conservation in the presence of phenomenological form factors, will be described. 18 refs., 8 figs.

• Research Organization: Southeastern Universities Research Association, Newport News, VA (USA). Continuous Electron Beam Accelerator Facility
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 5790261
• Report Number(s): DOE/ER/40150-58; CEBAF-PR--88-013; CONF-8806322--1; ON: DE89006251
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BOSONS
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COMPOSITE MODELS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORM FACTORS
FUNCTIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MESONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PHASE SHIFT
PROTON REACTIONS
QUARK MODEL
RELATIVISTIC RANGE
TARGETS
WAVE FUNCTIONS