Collective nuclear excitations in quantum hadrodynamics
Collective excitations in finite nuclei are studied within the framework of a renormalizable meson-baryon field theory of nuclei (called Quantum Hadrodynamics or QHD). Excited states are investigated in the context of the shell model which arises naturally from a self-consistent, relativistic Hartree description of the ground state. The only inputs are a small number of parameters fixed at experimental values or fitted to static properties of bulk nuclear matter. Attention is focused on low-lying negative-parity excitations in doubly-magic nuclei. Excited energies and wave functions are calculated in the Random Phase Approximation (RPA) using Hartree single-particle energies to form unperturbed levels and Hartree spinors as the particle-hole basis. The particle-hole interaction is determined by the meson masses and coupling constants, and by the Lorentz structure of the meson-nucleon couplings. The full Dirac matrix structure is maintained throughout. Meson retardation effects are shown to be negligible for the low-lying states. Two models of QHD are considered. QHD-I is based on baryons and neutral vector and scalar mesons. The model QHD-II includes, in addition, charged vector and pseudoscalar fields in a renormalizable field theory. Both pseudoscalar and pseudovector pion-nucleon couplings are examined. Expressions for all matrix elements are given along with a discussion of the numerical procedures.
- Research Organization:
- Stanford Univ., CA (USA)
- OSTI ID:
- 5226378
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BOSONS
ELECTRODYNAMICS
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MAGIC NUCLEI
MATHEMATICAL MODELS
MESONS
NUCLEAR MODELS
NUCLEI
PARTICLE INTERACTIONS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY