TY - JOUR

T1 - Neutrinos from pre-supernova in the framework of TQRPA method

AU - Dzhioev, A. A.

AU - Yudin, A. V.

AU - Dunina-Barkovskaya, N. V.

AU - Vdovin, A. I.

N1 - AY and NDB are grateful to S.I. Blinnikov for useful discussions on neutrino spectra from supernova progenitors on the late stages of their evolution. AY thanks RSF 22-12-00103 grant for support. All authors thank the anonymous reviewer for constructive comments and important suggestions that helped improve this manuscript.

PY - 2024/1/1

Y1 - 2024/1/1

N2 - We propose a new method for calculating spectra and luminosities for (anti)neutrinos produced in the pre-supernova environment by weak processes with hot nuclei. It is based on the thermal quasiparticle random phase approximation (TQRPA), which allows microscopic thermodynamically consistent calculations of the weak interaction response of nuclei at finite temperatures. For realistic representative pre-supernova conditions from the stellar evolution code MESA, we compute (anti)neutrino luminosities and spectra arising from neutral- and charged-current weak reactions with hot 56Fe and compare them with the contribution of thermal processes. We find that the TQRPA approach produces not only a higher total luminosity of electron neutrinos (mainly born in the electron capture reaction), compared to the standard technique based on the large-scale shell model (LSSM) weak interaction rates, but also a harder neutrino spectrum. Besides, applying the TQRPA and LSSM, we find that in the context of electron antineutrino generation, the neutral-current nuclear de-excitation (ND) process via neutrino-antineutrino pair emission is at least as important as the electron-positron pair annihilation process. We also show that flavour oscillations enhance the high-energy contribution of the ND process to the electron antineutrino flux. This could potentially be important for pre-supernova antineutrino registration by the Earth's detectors.

AB - We propose a new method for calculating spectra and luminosities for (anti)neutrinos produced in the pre-supernova environment by weak processes with hot nuclei. It is based on the thermal quasiparticle random phase approximation (TQRPA), which allows microscopic thermodynamically consistent calculations of the weak interaction response of nuclei at finite temperatures. For realistic representative pre-supernova conditions from the stellar evolution code MESA, we compute (anti)neutrino luminosities and spectra arising from neutral- and charged-current weak reactions with hot 56Fe and compare them with the contribution of thermal processes. We find that the TQRPA approach produces not only a higher total luminosity of electron neutrinos (mainly born in the electron capture reaction), compared to the standard technique based on the large-scale shell model (LSSM) weak interaction rates, but also a harder neutrino spectrum. Besides, applying the TQRPA and LSSM, we find that in the context of electron antineutrino generation, the neutral-current nuclear de-excitation (ND) process via neutrino-antineutrino pair emission is at least as important as the electron-positron pair annihilation process. We also show that flavour oscillations enhance the high-energy contribution of the ND process to the electron antineutrino flux. This could potentially be important for pre-supernova antineutrino registration by the Earth's detectors.

KW - instrumentation: detectors

KW - neutrinos

KW - supernovae: general

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85180126236&origin=inward&txGid=b8c5fe1e6e7691dccfd15eb52019fc4f

UR - https://www.mendeley.com/catalogue/2c1f41e4-9ee4-3676-b717-de51a12fcb13/

U2 - 10.1093/mnras/stad3730

DO - 10.1093/mnras/stad3730

M3 - Article

VL - 527

SP - 7701

EP - 7712

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -