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

Abstract

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.

Authors:
 [1];  [1];  [2];  [2];  [3];  [2];  [2]
  1. Department of Technical Physics, Peking University, Beijing 100871 (China)
  2. (China)
  3. Department of Physics, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
20995173
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.035806; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Chen Yanjun, Guo Hua, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, Liu Yuxin, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000. Neutrino scattering rates in neutron star matter with {delta} isobars. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.035806.
Chen Yanjun, Guo Hua, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, Liu Yuxin, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, & Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000. Neutrino scattering rates in neutron star matter with {delta} isobars. United States. doi:10.1103/PHYSREVC.75.035806.
Chen Yanjun, Guo Hua, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, Liu Yuxin, MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000. Thu . "Neutrino scattering rates in neutron star matter with {delta} isobars". United States. doi:10.1103/PHYSREVC.75.035806.
@article{osti_20995173,
title = {Neutrino scattering rates in neutron star matter with {delta} isobars},
author = {Chen Yanjun and Guo Hua and MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871 and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 and Liu Yuxin and MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871 and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.75.035806},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}