BINGO innovative assembly for background reduction in bolometric 0νββ experiments
arxiv(2024)
摘要
BINGO is a project aiming to set the grounds for large-scale bolometric
neutrinoless double-beta-decay experiments capable of investigating the
effective Majorana neutrino mass at a few meV level. It focuses on developing
innovative technologies to achieve a very low background index, of the order of
10^-5 counts/(keV kg yr) in the region of interest. The BINGO demonstrator,
called MINI-BINGO, will be composed of Li_2MoO_4 and TeO_2 crystals
coupled to bolometric light detectors designed to investigate the promising
double-beta-decay isotopes ^100Mo and ^130Te. This will allow us to
reject a significant background in bolometers caused by surface contamination
from α-active radionuclides by means of light yield selection. In
addition, BINGO introduces new methods to mitigate other sources of background,
such as surface radioactive contamination, external γ radioactivity, and
pile-up due to random coincidence of background events. This paper focuses on
the description of an innovative assembly designed to reduce the passive
materials in line of sight of the detectors, which is expected to be a dominant
source of background in next-generation bolometric experiments. We present the
performance of two prototype modules – housing four Li_2MoO_4 crystals in
total – operated in the Canfranc underground laboratory in Spain within a
facility developed for the CROSS double-beta-decay experiment.
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