Quasiparticle method in relativistic mean-field theories of nuclear structure

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7187597

Ai, H

In recent years, in order to understand the success of Dirac phenomenology, relativistic Brueckner-Hartree-Fock (RBHF) theory has been developed. This theory is a relativistic many-body theory of nuclear structure. Based upon the RBHF theory, which is characterized as having no free parameters other than those introduced in fitting free-space nucleon-nucleon scattering data, we construct an effective interaction. This interaction, when treated in a relativistic Hartree-Fock approximation, reproduces, rather accurately, the nucleon self-energy in nuclear matter, Migdal parameters obtained via relativistic Brueckner-Hartree-Fock calculations, and the saturation curves calculated with the full relativistic Brueckner-Hartree-Fock theory. This effective interaction is constructed by adding a number of pseudoparticles to the mesons used to construct one-boson-exchange (OBE) models of the nuclear force. The pseudoparticles have relatively large masses and either real or imaginary coupling constants. (For example, exchange of a pseudo-sigma with an imaginary coupling constant has the effect of reducing the scalar attraction arising from sigma exchange, while exchange of a pseudo-omega with an imaginary coupling constant has the effect of reducing the repulsion arising from omega exchange. The terms beyond the Born term in the case of pion exchange are well simulated by pseudo-sigma exchange with a real coupling constant.) The effective interaction constructed here may be used for calculations of the properties of finite nuclei in a relativistic Hartree-Fock approximation.

• Research Organization: City Univ. of New York, NY (USA)
• OSTI ID: 7187597
• Country of Publication: United States
• Language: English

Related Subjects

650000* -- Physics (1980-)
653001 -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSON-EXCHANGE MODELS
BRUECKNER MODEL
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
EQUATIONS
HARTREE-FOCK METHOD
INTERACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MEAN-FIELD THEORY
MIGDAL THEORY
NUCLEAR MODELS
NUCLEAR STRUCTURE
OBE MODEL
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
PERIPHERAL MODELS
WAVE EQUATIONS