The search for neutrino bursts from core collapse Supernovae at the Baksan Underground Scintillation Telescope

Measuring Muon-Induced Fast Neutrons at the Baksan Underground Scintillation Telescope

“…The total mass of the liquid scintillator contained in 3186 counters is 330 tons. The internal planes have the effective target mass 130 tons and are used for monitoring the Galaxy to study neutrino bursts from gravitational stellar collapses [2]. A standard scintillation counter of the BUST is an aluminium parallelepiped container with sizes 0.7 × 0.7 × 0.3 m 3 viewed from the top by a 15 cm diameter photomultiplier (PMT) through a organic glass illuminator.…”

“…In experiments searching for rare events, signals from neutrons have the same signature as the useful signal. In particular, the registration of electron anti-neutrinos [2] at the BUST made mainly through the inverse beta-decay reaction of electron antineutrinos on protons ν e + p → e + + n. The signal from the positron appears as a single operation of one of the internal counters, at the absence of signals from the other counters. Since the cross sections of reactions with neutrinos are relatively small, all possible reactions with neutrons effectively mimic signals from neutrinos.…”

Opto-acoustical gravitational bar detector with cryogenic mirrors

“…The sensitivity estimation can be found through the same formulas as for the large antenna (1) - (4). Analysis shows that for the test setup, parameters of the optical sensor can be taken not so extreme as for the large antenna, namely: the pump power can be 0.1 W and the number of reflection can be N=10 3 . The antenna in test setup cooled down to the liquid nitrogen temperature will have the sensitivity ~ 10 -18 (Hz) -1/2 in the "strain terminology", i.e.…”

A high frequency resonance gravity gradiometer

“…8 The BUST sensitivity is determined by the neutrino (antineutrino) threshold energy 8-10 MeV in 20 s pulses. Presently the both detectors, OGRAN and BUST, have a moderate sensitivity sufficient for registration of core collapse events in the Galaxy and in close environment ∼100 kpc, i.e., their application remains to be in the frame of "searching for rare events."…”

“…It consists in a search for Galactic collapsing stars on the neutrino channel. 8 In this paper, we describe the uncooled opto-acoustical gravitational antenna constructed for a "multi-channel mode" operation in the deep underground of Baksan Neutrino Observatory in parallel with Baksan Underground Scintillator Telescope (BUST) involved in the "collapse searching for" program. At the end of the final discussion, we present also a brief prospect of the multi-channel observational strategy.…”