Neutrino-nucleon scattering in supernova matter from the virial expansion
| Autor: | O. L. Caballero, Evan O'Connor, Charles Horowitz, Zidu Lin, Achim Schwenk |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Nuclear Theory 010308 nuclear & particles physics FOS: Physical sciences Virial mass Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Virial theorem Nuclear physics Nuclear Theory (nucl-th) Supernova Virial coefficient 0103 physical sciences Virial expansion Neutrino Präzisionsexperimente - Abteilung Blaum Nucleon Random phase approximation Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Physical Review C |
| DOI: | 10.48550/arxiv.1611.05140 |
| Popis: | We generalize our virial approach to study the neutral current neutrino response of nuclear matter at low densities. In the long-wavelength limit, the virial expansion makes model-independent predictions for neutrino-nucleon scattering rates and the density S_V and spin S_A responses. We find S_A is significantly reduced from one even at low densities. We provide a simple fit S_A^f(n,T,Y_p) of the axial response as a function of density n, temperature T and proton fraction Y_p. This fit reproduces our model independent virial results at low densities and reproduces the Burrows and Sawyer random phase approximation (RPA) results at high densities. Our fit can be incorporated into supernova simulations in a straight forward manner. Preliminary one dimensional supernova simulations suggest that the reduction in the axial response may enhance neutrino heating rates in the gain region during the accretion phase of a core-collapse supernovae. Comment: 7 pages, 3 figures |
| Databáze: | OpenAIRE |
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