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Title: Neutrino signal from proto-neutron star evolution: Effects of opacities from charged-current–neutrino interactions and inverse neutron decay

Abstract

In this work, we investigate the impact of charged-current–neutrino processes on the formation and evolution of neutrino spectra during the deleptonization of proto-neutron stars. To this end we develop the full kinematics of these reaction rates consistent with the nuclear equation of state, including weak magnetism contributions. This allows us to systematically study the impact of inelastic contributions and weak magnetism on the $$ν_e$$ and $$\bar{ν}_e$$ luminosities and average energies. Furthermore, we explore the role of the inverse neutron decay, also known as the direct Urca process, on the emitted spectra of $$\bar{ν}_e$$. This process is commonly considered in the cooling scenario of cold neutron stars but has so far been neglected in the evolution of hot proto-neutron stars. We find that the inverse neutron decay becomes the dominating opacity source for low-energy $$\bar{ν}_e$$. Accurate three-flavor Boltzmann neutrino transport enables us to relate the magnitude of neutrino fluxes and spectra to details of the treatment of weak processes. This allows us to quantify the corresponding impact on the conditions relevant for the nucleosynthesis in the neutrino-driven wind, which is ejected from the proto-neutron star surface during the deleptonization phase.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [7]
  1. Univ. of Wroclaw (Poland)
  2. GSI Helmholtzzentrum für Schwerioneneforschung, Darmstadt (Germany); Academia Sinica, Taipei (Taiwan)
  3. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
  4. GSI Helmholtzzentrum für Schwerioneneforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)
  5. Academia Sinica, Taipei (Taiwan); National Center for Theoretical Sciences, Hsinchu (Taiwan)
  6. GSI Helmholtzzentrum für Schwerioneneforschung, Darmstadt (Germany)
  7. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Centre of Poland (NCN); German Research Foundation (DFG); Taiwan Ministry of Science and Technology (MOST)
OSTI Identifier:
1800659
Alternate Identifier(s):
OSTI ID: 1599691
Grant/Contract Number:  
FG02-87ER40328; UMO-2016/23/B/ST2/00720; 107-2119-674 M-001-038; 108-2112-M-001-010
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C
Additional Journal Information:
Journal Volume: 101; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Physics

Citation Formats

Fischer, Tobias, Guo, Gang, Dzhioev, Alan A., Martínez-Pinedo, Gabriel, Wu, Meng-Ru, Lohs, Andreas, and Qian, Yong-Zhong. Neutrino signal from proto-neutron star evolution: Effects of opacities from charged-current–neutrino interactions and inverse neutron decay. United States: N. p., 2020. Web. doi:10.1103/physrevc.101.025804.
Fischer, Tobias, Guo, Gang, Dzhioev, Alan A., Martínez-Pinedo, Gabriel, Wu, Meng-Ru, Lohs, Andreas, & Qian, Yong-Zhong. Neutrino signal from proto-neutron star evolution: Effects of opacities from charged-current–neutrino interactions and inverse neutron decay. United States. https://doi.org/10.1103/physrevc.101.025804
Fischer, Tobias, Guo, Gang, Dzhioev, Alan A., Martínez-Pinedo, Gabriel, Wu, Meng-Ru, Lohs, Andreas, and Qian, Yong-Zhong. Fri . "Neutrino signal from proto-neutron star evolution: Effects of opacities from charged-current–neutrino interactions and inverse neutron decay". United States. https://doi.org/10.1103/physrevc.101.025804. https://www.osti.gov/servlets/purl/1800659.
@article{osti_1800659,
title = {Neutrino signal from proto-neutron star evolution: Effects of opacities from charged-current–neutrino interactions and inverse neutron decay},
author = {Fischer, Tobias and Guo, Gang and Dzhioev, Alan A. and Martínez-Pinedo, Gabriel and Wu, Meng-Ru and Lohs, Andreas and Qian, Yong-Zhong},
abstractNote = {In this work, we investigate the impact of charged-current–neutrino processes on the formation and evolution of neutrino spectra during the deleptonization of proto-neutron stars. To this end we develop the full kinematics of these reaction rates consistent with the nuclear equation of state, including weak magnetism contributions. This allows us to systematically study the impact of inelastic contributions and weak magnetism on the $ν_e$ and $\bar{ν}_e$ luminosities and average energies. Furthermore, we explore the role of the inverse neutron decay, also known as the direct Urca process, on the emitted spectra of $\bar{ν}_e$. This process is commonly considered in the cooling scenario of cold neutron stars but has so far been neglected in the evolution of hot proto-neutron stars. We find that the inverse neutron decay becomes the dominating opacity source for low-energy $\bar{ν}_e$. Accurate three-flavor Boltzmann neutrino transport enables us to relate the magnitude of neutrino fluxes and spectra to details of the treatment of weak processes. This allows us to quantify the corresponding impact on the conditions relevant for the nucleosynthesis in the neutrino-driven wind, which is ejected from the proto-neutron star surface during the deleptonization phase.},
doi = {10.1103/physrevc.101.025804},
journal = {Physical Review. C},
number = 2,
volume = 101,
place = {United States},
year = {Fri Feb 14 00:00:00 EST 2020},
month = {Fri Feb 14 00:00:00 EST 2020}
}

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