March 19, 2016 14:23 WSPC/Trim Size: 9in x 6in for Proceedings dokuch3p HIDDEN SOURCES OF HIGH-ENERGY NEUTRINO V. S. BEREZINSKY INFN, Laboratori Nazionali del Gran Sasso, I-67010 Assergi (AQ), Italy E-mail: berezinsky@inr.npd.ac.ru V. I. DOKUCHAEV Institute for Nuclear Research, Russian Academy of Sciences, 60th October Anniversary prospect 7a, 117312 Moscow, Russia E-mail: dokuchaev@inr.npd.ac.ru The model of a short-lived and powerful hidden source of high-energy neutrinos which does not restricted by limitations for transparent astrophysical sources is described. This source is formed under the natural dynamical evolution of a galac- tic nucleus prior to its collapse into a massive black hole. Frequent collisions of neutron stars are accompanied by the generation of ultrarelativistic fireballs and shock waves. These repeating fireballs result in a formation of the rarefied cavity inside the massive envelope. Protons are effectively accelerated in the cavity and, due to pp-collisions in the gas envelope, they produce high-energy neutrinos. All high-energy particles, except neutrinos, are absorbed in the envelope. High-energy neutrino signal from this source can be detected by underground neutrino telescope with effective area S ∼ 1 km 2 . 1. Hidden astrophysical sources of high-energy neutrino High-energy (HE) neutrino radiation from transparent astrophysical sources is accompanied by other types of radiation, most notably by the HE gamma-radiation and cosmic rays (CRs): “cosmic proton accelerators pro- duce cosmic rays, γ -rays and neutrinos with comparable luminosities” 1 . These provides strong limits on the HE neutrino fluxes from possible transparent astrophysical accelerators 2,3,4 . However, there can be “hid- den sources”, where accompanying electromagnetic radiation and CRs are absorbed. Several models of hidden sources were discussed up to date: (1) Thorne-Zytkow Star: the binary with a pulsar submerged into a red giant star, can emit HE neutrinos while all kinds of e-m radiation are absorbed by the red giant component 5 . 1