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By Y. Aharonov, F. T. Avignone Iii and S. Nussinov


We address a possible implication of the triplet majoron (TM) model for neutrino pulses from supernovae. If the v~v~-majoron coupling is ~ 0.7 X 10-3, suggested by one of the recent ~13-decay experiments, equilibration of v-species via v~v~--.%v,(v~v~), occurs on a time scale ~ 10-4 s. Rapid equilibration followed by decay in flight via v(v~)--.9 ~ +X °, could dramatically enhance the probability of observing neutronization neutrinos, even for g ~ ~ ~ 10-is. This effect would make nearby supernovae sensitive tests of TM models. A millisecond "neutronization " pulse of v e is pre-dicted by most stellar collapse calculations [ 1-3]. Unfortunately this pulse is virtually undetectable in the present water Cerenkov counters. Thus the eleven and eight neutrinos from SN 1987A detected by the Kamioka II [ 4] and IMB [ 5] detectors respectively, are believed to originate from the thermal %, emit-ted with approximately equal numbers and energies as the other five species v~, 9~, v~, %, v~, over a 1-10 s interval, rather than from the neutronization puls

Year: 1987
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