Nuclear non-perturbative excitations

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6580666

Boguta, J; Kunz, J

We investigate consequences of a description of nuclear physics in terms of a relativistic field theory. The model Lagrangian contained baryons, sigma-mesons and omega-mesons, and was subsequently extended to include also ..pi..-mesons and rho-mesons. The most important successes of this approach are discussed. In addition to the description of known nuclear structure the field theoretical approach may reveal entirely new nuclear phenomena, based on the explicit treatment of mesonic degrees of freedom. A phenomenological nuclear Lagrangian can be constructed, where the isovector Lorentz-vector rho-meson is described by a non-Abelian gauge field, that acquires its mass spontaneously due to the non-vanishing vacuum expectation value of a Higgs field. The gauge sector solition solution is discussed. For the SU(2) gauge field theory with the Higgs field in the fundamental representation no non-trival topological conservation laws hold. This indicates that the soliton is unstable. Fermions cannot stabilize the soliton solution energetically, because only zero-binding-energy solutions for the fermions exist. Fermions in the presence of the soliton are discussed. Also, it is attempted to achieve stability of the soliton solution by coupling it to the ..pi..-field. Describing the ..pi..-field by the nonlinear sigma-model yields a conserved topological quantum number. In the linear sigma-model the soliton can only be stabilized energetically. 32 references. (WHK)

• Research Organization: Lawrence Berkeley Lab., CA (USA); Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6580666
• Report Number(s): LA-UR-84-2364; CONF-8406178-2; ON: DE84015525
• Country of Publication: United States
• Language: English

Related Subjects

653007* -- Nuclear Theory-- Nuclear Models-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
GENERAL RELATIVITY THEORY
HADRONS
LAGRANGIAN FUNCTION
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
NUCLEAR MODELS
PARTICLE MODELS
PIONS
PSEUDOSCALAR MESONS
QUASI PARTICLES
RELATIVITY THEORY
RESONANCE PARTICLES
RHO-765 RESONANCES
SIGMA MODEL
SIGMA-410 RESONANCES
SOLITONS
VECTOR MESONS