Nuclear forces and nuclear matter including pions and isobars

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6485433

Coester, F

Conventional nuclear theory is based on the rather successful model which stipulates that nuclei consist of nucleons with two-body interactions. Extensive use of pion beams as probes of nuclear structure suggests a minimal extension of this model to include pion degrees of freedom explicitly in a manner which allows production and absorption of pions without dressing isolated nucleons with a pion cloud. Some properties of such models are discussed. The parameters of the models are fitted to properties of the pion-nucleon and nucleon-nucleon systems. The nucleon is endowed with a 3/2 3/2 excited state, the ..delta.. isobar, which can decay by pion emission. The pion-nucleon interaction consists of two-body potentials in addition to the ..delta..-decay interaction which provides the mechanism for pion production and absorption. There is no ..pi..NN vertex in the Hamiltonian and therefore no pion cloud attached to a single nucleon.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6485433
• Report Number(s): CONF-810107-7; ON: DE83008525
• Country of Publication: United States
• Language: English

Related Subjects

653007* -- Nuclear Theory-- Nuclear Models-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
BARYON RESONANCES
BARYONS
BOSONS
DELTA-1236 RESONANCES
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HAMILTONIANS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MATTER
MESONS
N RESONANCES
NUCLEAR FORCES
NUCLEAR MATTER
NUCLEAR MODELS
NUCLEON-NUCLEON POTENTIAL
PIONS
POTENTIALS
PSEUDOSCALAR MESONS
QUANTUM OPERATORS
RESONANCE PARTICLES