Covariant description of the. Delta. in nuclear matter

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.2567· OSTI ID:6949114

de Jong, F; Malfliet, R ^[1]

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1. Kernfysisch Versneller Instituut, 9747 AA Groningen (Netherlands)

To incorporate the {Delta} isobar in the relativistic Dirac-Brueckner model we develop a formalism that treats the {Delta} analogously to the nucleon. That is, we introduce scalar and vector components of the {Delta} self-energy and define effective quantities for the {Delta} similar to the ones for the nucleon. Using this formalism and based on one-boson-exchange interactions, we present a parameter-free calculation of the equation of state of nuclear matter. We list results for the effective quantities of both the nucleon and the {Delta}. The main result we find is that in our model the properties of the nucleon in nuclear matter seem hardly affected by the inclusion of the {Delta}. Also the medium dependence of the properties of the {Delta} turns out to be quite small. Finally we investigate the momentum dependence of the mean field of the {Delta}.

• OSTI ID: 6949114
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BOSON-EXCHANGE MODELS
BRUECKNER MODEL
DELTA BARYONS
DELTA-1232 BARYONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
MATHEMATICAL MODELS
MATTER
MEAN-FIELD THEORY
MEV RANGE
N BARYONS
NUCLEAR MATTER
NUCLEAR MODELS
OBE MODEL
PARTICLE MODELS
PERIPHERAL MODELS
PHASE SHIFT
RELATIVISTIC RANGE