|author(s)||V. 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.|
|title||First results from the AMoRE-Pilot neutrinoless double beta decay experiment|
|source||Eur. Phys. J. C 79, 791 (2019)|
The advanced molybdenum-based rare process experiment (AMoRE) aims to search for neutrinoless double beta decay (0𝜈𝛽𝛽) of 100Mo with ∼100kg of 100Mo-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 48Ca-depleted calcium and 100Mo-enriched molybdenum (48deplCa100MoO4). 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 0𝜈𝛽𝛽 search with a 111 kg day live exposure of 48deplCa100MoO4 crystals. No evidence for 0𝜈𝛽𝛽 decay of 100Mo is found, and a upper limit is set for the half-life of 0𝜈𝛽𝛽 of 100Mo of 𝑇0𝜈1/2>9.5×1022 years at 90% C.L. This limit corresponds to an effective Majorana neutrino mass limit in the range ⟨𝑚𝛽𝛽⟩≤(1.2−2.1)eV.