Open AccessThe CROSS experiment: search for 0v2β decay with surface sensitive bolometers
Author(s) -
A. Zolotarova
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1468/1/012147
Subject(s) - bolometer , cryostat , majorana , physics , observatory , ultrapure water , surface (topology) , nuclear physics , materials science , detector , optoelectronics , analytical chemistry (journal) , neutrino , nanotechnology , optics , superconductivity , chemistry , astrophysics , geometry , mathematics , chromatography , quantum mechanics
CROSS (Cryogenic Rare-event Observatory with Surface Sensitivity) is a project aiming to develop a new bolometric technology enabling an active background rejection in 0 v 2 β search. The isotopes of interest are 100 Mo and 130 Te, and bolometers are based on Li 2 MoO 4 and TeO 2 crystals. The key feature of CROSS detectors is the possibility of pulseshape discrimination of near surface interactions. An ultrapure superconductive aluminum film, deposited on the crystal surface, is acting as a pulse-shape modifier for phonon sensors, providing separation of surface events from bulk ones. First prototypes were produced and successfully tested aboveground with the rejection of α surface radioactivity higher than 99.9%. A demonstrator with 32 0.28-kg Li 2 100 MoO 4 crystals will be installed in a dedicated cryostat in the Canfranc underground laboratory (Spain) to confirm the reproducibility of surface sensitive bolometers. CROSS demonstrator can obtain sensitivities to the effective Majorana mass down to 70 meV in the most favorable conditions. The CROSS technology can be applied for future ton-scale experiments, reaching sensitivities to the effective Majorana mass down to 10 meV.