First cryogenic tests on BINGO innovations

Abstract

Neutrinoless double-beta decay ($0\nu 2{\hat{I}}^2$) is a hypothetical rare nuclear transition. Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. BINGO (Bi-Isotope $0\nu 2{\hat{I}}^2$ Next Generation Observatory) aims to set the technological grounds for future bolometric $0\nu 2{\hat{I}}^2$ experiments. It is based on a dual heat-light readout, i.e. a main scintillating absorber embedding the double-beta decay isotope accompanied by a cryogenic light detector. BINGO will study two of the most promising isotopes: ${}^{100}$Mo embedded in Li${}_2$MoO${}_4$ (LMO) crystals and ${}^{130}$Te embedded in TeO${}_2$. BINGO technology will reduce dramatically the background in the region of interest, thus boosting the discovery sensitivity of $0\nu 2{\hat{I}}^2$. The proposed solutions will have a high impact on next-generation bolometric tonne-scale experiments, like CUPID. In this contribution, we present the results obtained during the first tests performed in the framework of BINGO R&D.

4 pages, 2 figures. Contribution to the proceedings of 32nd Rencontres de Blois, Blois, France, 17-22 October 2021