Nuclear matter studies with density-dependent meson-nucleon coupling constants

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.497· OSTI ID:531933

Banerjee, M K; Tjon, J A ^[1]; Banerjee, M K ^[2]; Tjon, J A ^[3]

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1. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
2. Institute for Kernphysik, Forschungszentrum Juelich, D-52425 Juelich (Germany)
3. Institute for Theoretical Physics, University of Utrecht, 3508 TA Utrecht (the Netherlands)

Due to the internal structure of the nucleon, we should expect, in general, that the effective meson nucleon parameters may change in nuclear medium. We study such changes by using a chiral confining model of the nucleon. We use density-dependent masses for all mesons except the pion. Within a Dirac-Brueckner analysis, based on the relativistic covariant structure of the NN amplitude, we show that the effect of such a density dependence in the NN interaction on the saturation properties of nuclear matter, while not large, is quite significant. Due to the density dependence of the g{sub {sigma}NN}, as predicted by the chiral confining model, we find, in particular, a looping behavior of the binding energy at saturation as a function of the saturation density. A simple model is described, which exhibits looping and which is shown to be mainly caused by the presence of a peak in the density dependence of the medium modified {sigma}N coupling constant at low density. The effect of density dependence of the coupling constants and the meson masses tends to improve the results for E/A and density of nuclear matter at saturation. From the present study we see that the relationship between binding energy and saturation density may not be as universal as found in nonrelativistic studies and that more model dependence is exhibited once medium modifications of the basic nuclear interactions are considered. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: University of Maryland
• DOE Contract Number: FG02-93ER40762
• OSTI ID: 531933
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BINDING ENERGY
CHIRAL SYMMETRY
CONFINEMENT
COUPLING CONSTANTS
DENSITY
MESON-NUCLEON INTERACTIONS
NUCLEAR FORCES
NUCLEAR MATTER
NUCLEONS
SATURATION