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Hauptverfasser:	Guo, Gang, Martínez-Pinedo, Gabriel, Wu, Meng-Ru
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Nuclear Theory Solar and Stellar Astrophysics
Online-Zugang:	https://arxiv.org/abs/2401.10737
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

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author	Guo, Gang Martínez-Pinedo, Gabriel Wu, Meng-Ru
author_facet	Guo, Gang Martínez-Pinedo, Gabriel Wu, Meng-Ru
contents	We compute the static density and spin structure factors in the long wavelength limit for pure neutron matter at subsaturation densities relevant to core-collapse supernovae within the Brueckner-Hartree-Fock (BHF) approach. The BHF results are reliable at high densities, extending beyond the validity of the virial expansion. Motivated by the similarities between the dilute neutron gas and a unitary gas, we propose a phenomenological approach to derive the static structures with finite momentum transfer as well as the dynamic ones with simple analytical expressions, based on the computed static structures in the long wavelength limit. We also compare the in-medium neutrino-neutron scattering cross sections using different structure factors. Our study emphasizes the importance of accurately computing the static structure factors theoretically and utilizing the full dynamic structure factors in core-collapse supernova simulations.
format	Preprint
id	arxiv_https___arxiv_org_abs_2401_10737
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Neutrino-Neutron Scattering Opacities in Supernova Matter Guo, Gang Martínez-Pinedo, Gabriel Wu, Meng-Ru Nuclear Theory Solar and Stellar Astrophysics We compute the static density and spin structure factors in the long wavelength limit for pure neutron matter at subsaturation densities relevant to core-collapse supernovae within the Brueckner-Hartree-Fock (BHF) approach. The BHF results are reliable at high densities, extending beyond the validity of the virial expansion. Motivated by the similarities between the dilute neutron gas and a unitary gas, we propose a phenomenological approach to derive the static structures with finite momentum transfer as well as the dynamic ones with simple analytical expressions, based on the computed static structures in the long wavelength limit. We also compare the in-medium neutrino-neutron scattering cross sections using different structure factors. Our study emphasizes the importance of accurately computing the static structure factors theoretically and utilizing the full dynamic structure factors in core-collapse supernova simulations.
title	Neutrino-Neutron Scattering Opacities in Supernova Matter
topic	Nuclear Theory Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2401.10737

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