Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-18
Phys.Rev. D70 (2004) 043006
Astronomy and Astrophysics
Astrophysics
14 pages, 5 figures
Scientific paper
10.1103/PhysRevD.70.043006
We reanalyze the neutrino events from SN1987A in IMB and Kamiokande-II (KII) detectors, and compare them with the expectations from simple theoretical models of the neutrino emission. In both detectors the angular distributions are peaked in the forward direction, and the average cosines are 2 sigma above the expected values. Furthermore, the average energy in KII is low if compared with the expectations; but, as we show, the assumption that a few (probably one) events at KII have been caused by elastic scattering is not in contrast with the 'standard' picture of the collapse and yields a more satisfactory distributions in angle and (marginally) in energy. The observations give useful information on the astrophysical parameters of the collapse: in our evaluations, the mean energy of electron antineutrinos is
Costantini Maria Laura
Ianni Aldo
Vissani Francesco
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