NEUTRINO EMISSIVITIES FROM DEUTERON BREAKUP AND FORMATION IN SUPERNOVAE

Journal Article · Tue Mar 10 04:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/801/2/78· OSTI ID:22522072

Nasu, S.; Nakamura, S. X.; Sato, T. ^[1]; Sumiyoshi, K. ^[2]; Myhrer, F.

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1. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
2. Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501 (Japan)

Neutrino emissions from electron/positron capture on the deuteron and the nucleon-nucleon fusion processes in a supernova core are studied. These weak processes are evaluated in an approach which consists of one-nucleon and two-nucleon meson-exchange currents and nuclear wave functions generated by a high precision nucleon-nucleon potential. In addition to the cross sections for these processes involving the deuteron, we present neutrino emissivities due to these processes calculated for typical profiles of core-collapsed supernovae. These novel neutrino emissivities are compared with the standard neutrino-emission mechanisms. We find that the electron-type neutrino emissivity due to electron capture on the deuteron is comparable to that on the proton in the deuteron abundant region. The electron-type antineutrino emissivity due to positron capture on the deuteron is much smaller than that on the neutron. The neutrino emissivity through deuteron formation is smaller than the conventional processes, but may be important in a situation where the nucleon-nucleon bremsstrahlung is important. The implications of the new channels involving deuterons for the supernova mechanism are discussed.

• OSTI ID: 22522072
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 801; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
ANTINEUTRINOS
BOSON-EXCHANGE MODELS
BREMSSTRAHLUNG
COMPARATIVE EVALUATIONS
COSMIC NEUTRINOS
CROSS SECTIONS
DEUTERONS
ELECTRON CAPTURE
EMISSIVITY
NUCLEAR REACTIONS
NUCLEON-NUCLEON POTENTIAL
NUCLEOSYNTHESIS
SUPERNOVAE
WAVE FUNCTIONS