A CaMoO4 Crystal Low Temperature Detector for the AMoRE Neutrinoless Double Beta Decay Search

Abstract

We report the development of a CaMoO4 crystal low temperature detector for the AMoRE neutrinoless double beta decay (0ν\b{eta}\b{eta}) search experiment. The prototype detector cell was composed of a 216 g CaMoO4 crystal and a metallic magnetic calorimeter. An over-ground measurement demonstrated FWHM resolution of 6-11 keV for full absorption gamma peaks. Pulse shape discrimination was clearly demonstrated in the phonon signals, and 7.6 σ of discrimination power was found for the α and \b{eta}/γ separation. The phonon signals showed rise-times of about 1 ms. It is expected that the relatively fast rise-time will increase the rejection efficiency of two-neutrino double beta decay pile-up events which can be one of the major background sources in 0ν\b{eta}\b{eta} searches.

6 pages, 8 figures, 1 table. Published in Advanced in High Energy Physics

References in corpus (7)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Limits on the neutrino mass from neutrinoless double-$\beta$ decay
• Performance of scintillation materials at cryogenic temperatures
• Q value of the 100Mo Double-Beta Decay
• Development of CaMoO4 crystal scintillators for double beta decay experiment with 100-Mo
• Random coincidence of $2\nu 2\beta$ decay events as a background source in bolometric $0\nu 2\beta$ decay experiments
• Rejection of randomly coinciding events in ZnMoO${}_4$ scintillating bolometers

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• Radiopure tungstate and molybdate crystal scintillators for double beta decay experiments
• Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers
• Growth and characterization of a Li2Mg2(MoO4)3 scintillating bolometer
• Neutron and muon-induced background studies for the AMoRE double-beta decay experiment
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