Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-11-09
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 5 EPS figures, based on the talk presented by A. A. Okrugin at the XVI International Seminar Quarks'2010, Kolomna, Mo
Scientific paper
We investigate the neutrino helicity-flip process under supernova core conditions, where the left-handed neutrinos being produced can be converted into right-handed neutrinos sterile with respect to the weak interaction due to the interaction of magnetic moments with plasma electrons and protons. Instead of the uniform ball model for the SN core used in previous analyses, realistic models for radial distributions and time evolution of physical parameters in the supernova core are considered. We have obtained new upper limits on the Dirac neutrino magnetic moment averaged over flavours and time from the condition that the influence of the right-handed neutrino emission on the total cooling time scale should be limited.
Kuznetsov Alexander Vasilievich
Mikheev Nickolay V.
Okrugin A. A.
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