Diffuse supernova neutrino background and neutrino decay

Full text: The study of diffuse supernova neutrino background (DNSB) is an experimental and theoretical challenge, previous works establish an energy window approximately [11-20] MeV for neutrino and antineutrino flux within there are probabilities for detecting these signals. Superkamiokande established an upper experimental bound for electronic antineutrino flux (Φνe (E > 19.3 MeV) < 1.4 - 1.9cm-2s-1). This bound is near to theoretical values. The detection of this flux let us know many aspects of the neutrino physics and the early physics of the universe. We would know more about the neutrino oscillation, and we can also test the stability of this particle. In previous works were studied models in which the lepton number was violated, these models led us to neutrino's decay and gave mass to this particle. The Majorons (Goldstone Bosons) are in theory, scalar massless particles which appears when the leptonic global symmetry is broken, in this work we take neutrinos as Majorana particles and consider a heavy neutrino decay in two particles, one light neutrino and one Majoron. We revisit and recalculate DNSB for electronic neutrino and antineutrino, and we see how this flux is altered with neutrino decay. We take also two different models for the supernova creation rate. Finally we calculate the number of events in a given detector. (author)