IMPLICATIONS OF MAJORANA NEUTRINO TRANSITION MAGNETIC-MOMENTS FOR NEUTRINO SIGNALS FROM SUPERNOVAE

We study resonant neutrino oscillations (RNO) and resonant spin-flavor precession (RSFP) of Majorana neutrinos inside supernovae. The response of H2O and D2O detectors to supernova neutrinos is calculated for the following scenarios: (i) standard model; (ii) RNO; (iii) RSFP, and (iv) RNO + RSFP. For the H2O detectors, event numbers for both the Kamiokande II and IMB detection efficiencies are calculated. It is shown that for sufficiently large H2O detectors (such as the planned Super-Kamiokande one) the combined analysis of the isotropic/directional event-number ratio and prompt neutronization burst signal will enable one to distinguish between all the considered possibilities provided the distance to supernova is less than 10 kpc. Even more rich and conclusive information may be reached by using the D2O detector since it will allow one to observe the neutrinos via two charged-current reaction modes and a neutral-current mode in addition to the nu-e scattering.