The first second of SN1987A neutrino emission

Details The first second of SN1987A neutrino emission The first second of SN1987A neutrino emission

2007-05-28

arxiv.org/abs/0705.4032v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures

Scientific paper

A large fraction of SN1987A electron antineutrino events has been recorded in the first second. We study how this observation fits into the conventional paradigm for neutrino emission, and show that there is a 3.2 sigma hint for an initial accretion phase. This phase involves a large fraction of the energy emitted in neutrinos and antineutrinos, about 20 % or larger. The occurrence of neutrino oscillations strengthens these inferences. We discuss why three flavor oscillations with normal mass hierarchy are completely acceptable, whereas oscillations with inverted mass hierarchy require more troublesome interpretations, if theta(13) is above 0.5-1 degrees.

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