The CROSS Experiment: Rejecting Surface Events by PSD Induced by Superconducting Films

Abstract

Neutrinoless double beta ($0\nu \beta \beta$) decay is a hypothetical rare nuclear transition ($T_{1/2}>10^{26}$ y). Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. This decay can be investigated with bolometers embedding the double beta decay isotope (${}^{76}$Ge, ${}^{82}$Se, ${}^{100}$Mo, ${}^{116}$Cd, ${}^{130}$Te...), which perform as low temperature calorimeters (10 mK) detecting particle interactions via a small temperature rise read out by a dedicated thermometer. CROSS (Cryogenic Rare-event Observatory with Surface Sensitivity) aims at the development of bolometric detectors (Li${}_2$MoO${}_4$ and TeO${}_2$) capable of discriminating surface $\alpha$ and $\beta$ interactions by exploiting superconducting properties of Al film deposited on the crystal surface. We report in this paper the results of tests on prototypes performed at CSNSM (Orsay, France) that showed the capability of a-few-$\mu$m-thick superconducting Al film deposited on crystal surface to discriminate surface $\alpha$ from bulk events, thus providing the detector with the required surface sensitivity capability. The CROSS technology would further improve the background suppression and simplify the detector construction with a view to future competitive double beta decay searches.

arXiv commentAccepted for publication in J. Low Temp. Phys

References in corpus (11)

• Neutrinoless Double-Beta Decay: Status and Prospects
• Neutrinoless double beta decay: 2015 review
• First Results from CUORE: A Search for Lepton Number Violation via $0\nu \beta \beta$ Decay of ${}^{130}$Te
• Scintillating double beta decay bolometers
• Development of ${}^{100}$Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search
• CUORE crystal validation runs: results on radioactive contamination and extrapolation to CUORE background
• A novel technique of particle identification with bolometric detectors
• Low background techniques in bolometers for double-beta decay search
• The $0\nu 2\beta$-decay CROSS experiment: preliminary results and prospects
• ${}^{100}$Mo-enriched Li${}_2$MoO${}_4$ scintillating bolometers for $0\nu 2\beta$ decay search: from LUMINEU to CUPID-0/Mo projects
• Tunable Superconducting Properties of a-NbSi Thin Films and Application to Detection in Astrophysics

Cited by in corpus (4)

• Phonon-mediated crystal detectors with metallic film coating capable of rejecting $\alpha$ and $\beta$ events induced by surface radioactivity
• Twelve-crystal prototype of Li${}_2$MoO${}_4$ scintillating bolometers for CUPID and CROSS experiments
• A novel mechanical design of a bolometric array for the CROSS double-beta decay experiment
• Cosmic muon flux attenuation methods for superconducting qubit experiments