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

Tobias Fischer, Gang Guo, Alan A. Dzhioev, Gabriel Martínez-Pinedo, Meng Ru Wu, Andreas Lohs, Yong Zhong Qian

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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 νe and ν̄e 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 ν̄e. 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 ν̄e. 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.

Original languageEnglish (US)
Article number025804
JournalPhysical Review C
Issue number2
StatePublished - Feb 2020

Bibliographical note

Funding Information:
The supernova simulations were performed at the Wroclaw Center for Scientific Computing and Networking (WCSS) in Wroclaw (Poland). T.F. acknowledges support from the Polish National Science Center (NCN) under Grant No. UMO-2016/23/B/ST2/00720. G.M.P. acknowledge the support of the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Projektnummer 279384907-SFB 1245 “Nuclei: From Fundamental Interactions to Structure and Stars.” M.R.W. acknowledges support from the Ministry of 673 Science and Technology, Taiwan under Grants No. 107-2119-674 M-001-038 and No. 108-2112-M-001-010, and from the Physics Division of National Center for Theoretical Sciences. This work was supported by the COST Actions CA16117 “ChETEC” and CA16214 “PHAROS,” and by the US DOE Grant No. DE-FG02-87ER40328.

Publisher Copyright:
© 2020 American Physical Society.


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