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First results from the AMoRE-Pilot neutrinoless double beta decay experimentV. Alenkov, H. W. Bae, J. Beyer, R. S. Boiko, K. Boonin, O. Buzanov, N. Chanthima, M. K. Cheoun, D. M. Chernyak, J. S. Choe, S. Choi, F. A. Danevich, M. Djamal, D. Drung, C. Enss, A. Fleischmann, A. M. Gangapshev, L. Gastaldo, et. al.
The advanced molybdenum-based rare process experiment (AMoRE) aims to search for neutrinoless double beta decay () of Mo with of Mo-enriched molybdenum embedded in cryogenic detectors with a dual heat and light readout. At the current, pilot stage of the AMoRE project we employ six calcium molybdate crystals with a total mass of 1.9 kg, produced from Ca-depleted calcium and Mo-enriched molybdenum (). The simultaneous detection of heat (phonon) and scintillation (photon) signals is realized with high resolution metallic magnetic calorimeter sensors that operate at milli-Kelvin temperatures. This stage of the project is carried out in the Yangyang underground laboratory at a depth of 700 m. We report first results from the AMoRE-Pilot search with a 111 kg day live exposure of crystals. No evidence for decay of Mo is found, and a upper limit is set for the half-life of of Mo of at 90% C.L. This limit corresponds to an effective Majorana neutrino mass limit in the range .
Eur. Phys. J. C 79, 791 (2019)