CC BY
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BMy. CepHH 3. OH3HKA. ACTPOHOMHfl. 2022. №2
NEUTRINOS
Search for Neutrino Radiation from the Collapse of Stellar Cores Using LVD Detector
N. Agafonova", V. Ashikhmin, E. Dobrynina, R. Enikeev, O. Ryazhskaya, I. Shakyrianova, V. Yakushev
(on Behalf of the LVD Collaboration) E-mail: aagafonova@inr.ru
Institute for Nuclear Research of RAS. Moscow, 117312 Russia Received January 15, 2022
The article presents the latest results with the experiment of the Large Volume Detector located in the Gran Sasso Laboratory at the depth of 3650 m.w.e. LVD has been in operation since 1992 on the program a search for neutrino bursts from stellar core colapses, variations of the cosmic ray muon flux, and investigations of background sources at detecting rare events. According to the data of the LVD neutrino telescope for 29 years of operation (1992-2021), an experimental limitation on the frequency of neutrino bursts from gravitational collapses of stars in the Galaxy was obtained: less than 1 event in 12.6 years (f = 0.08 year-1) at a 90% confidence level.
Keywords: neutrino, Gravitational collapse, underground physics.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 349-351.
BINGO: Bi-Isotope 0v2/3 Next Generation Observatory
A. Armatol (on behalf of the BINGO collaboration) E-mail: antoine.armatol@cea.fr
IRFU, CEA, Université Paris-Saclay. Saclay, France Received January 16, 2022
The search for neutrinoless double-beta decay (0v23), a hypothetical nuclear decay, is one of the major challenges of contemporary physic since its discovery would prove the non conservation of the lepton number and would give an answer to the question of neutrino nature (Dirac or Majorana particles). Starting from the scintillating bolometer technique (a scintillating cryogenic absorber embedding a 0v23 candidate coupled with a cryogenic light detector for dual heat-light readout), BINGO will search for this decay using the knowledge acquired so far by bolometric experiments with the addition of new methods and technologies to reduce drastically the background in the region of interest. BINGO will study two isotopes which have already shown their good suitability for this detection method: 100Mo and 130Te. The proposed solutions will have a high impact on next-generation bolometric tonne-scale experiments, like CUPID, to push further the sensitivity to the half-life of the process. In this contribution, we present the main axes of the project.
Keywords: bolometers, cryogenics, neutrinoless double beta decay, low radioactivity.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 352-353.
Review on Reactor Neutrino Present and Future
Thiago Bezerra E-mail: s26@sussex.ac.uk Department of Physics and Astronomy, University of Sussex Sussex House, Falmer, Brighton, BN1 9RH, United Kingdom Received January 16, 2022
Nuclear reactors are an essential source of neutrinos. In this proceeding, I review the past and current status of the research on neutrino oscillations using reactor neutrinos. I also present a promising idea for positron tagging that will potentially be a game-changer in the field.
Keywords: reactor neutrino present, three flavour neutrino oscillation, inverse beta decay.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 354-358.
