A refined fit of the SN1987A antineutrino data finds accretion at about 99% confidence and a small, theory-compatible neutron fraction, closing a tension in older analyses.
Inverted Hierarchy of Neutrino Masses Disfavored by Supernova 1987A
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We discuss the flavor conversion of supernova neutrinos in the three-flavor mixing scheme of neutrinos. We point out that by neutrino observation from supernova one can discriminate the inverted hierarchy of neutrino masses from the normal one if s_{13}^2 \gsim a few \times 10^{-4}, irrespective of which oscillation solution to the solar neutrino problem is realized in nature. We perform an analysis of data of SN1987A and obtain a strong indication that the inverted mass hierarchy is disfavored unless s_{13}^2 \lsim a few \times 10^{-4}.
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The flux of electron antineutrinos from supernova SN1987A data
A refined fit of the SN1987A antineutrino data finds accretion at about 99% confidence and a small, theory-compatible neutron fraction, closing a tension in older analyses.