Neutrino scattering rates in neutron star matter with {delta} isobars

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.035806· OSTI ID:20995173

Yanjun, Chen ^[1]; Hua, Guo ^[1]; Yuxin, Liu ^[2]

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1. Department of Technical Physics, Peking University, Beijing 100871 (China)
2. Department of Physics, Peking University, Beijing 100871 (China)

We take the {delta}-isobar degrees of freedom into account in neutron star matter and evaluate their contributions to neutrino scattering cross sections and mean free paths. The neutron star matter is described by means of an effective hadronic model in the relativistic mean-field approximation. It is found that {delta} isobars may be present in neutron stars. The electron chemical potential does not decrease and the neutrino abundance does not increase with the increase of the density when neutrinos are trapped in the matter with {delta} isobars. The large vector coupling constant between the {delta}{sup -} and neutrino and the high spin of the {delta} influence significantly the neutrino scattering cross section and lead the contribution of the {delta}{sup -} to the dominance of the scattering rates. In neutrino-trapped case, the presence of {delta}s causes the neutrino mean free path to decrease drastically compared to that in the matter in which baryons are only nucleons.

• OSTI ID: 20995173
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
COUPLING CONSTANTS
CROSS SECTIONS
DEGREES OF FREEDOM
DENSITY
ELECTRONS
MATTER
MEAN FREE PATH
MEAN-FIELD THEORY
NEUTRINOS
NEUTRON STARS
NUCLEONS
RELATIVISTIC RANGE
SCATTERING
SPIN
TRAPPING
VECTORS