Publication Date:
2019-09-01
Description:
The advanced molybdenum-based rare process experiment (AMoRE) aims to search for neutrinoless double beta decay ($$0
u eta eta $$0νββ) of $$^{100}$$100Mo with $$sim 100,hbox {kg}$$∼100kg of $$^{100}$$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 $$^{48}$$48Ca-depleted calcium and $$^{100}$$100Mo-enriched molybdenum ($$^{48{{ext {depl}}}}hbox {Ca}^{100}hbox {MoO}_{4}$$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 $$0
u eta eta $$0νββ search with a 111 kg day live exposure of $$^{48{{ext {depl}}}}hbox {Ca}^{100}hbox {MoO}_{4}$$48deplCa100MoO4 crystals. No evidence for $$0
u eta eta $$0νββ decay of $$^{100}$$100Mo is found, and a upper limit is set for the half-life of $$0
u eta eta $$0νββ of $$^{100}$$100Mo of $$T^{0
u }_{1/2} 〉 9.5imes 10^{22}~hbox {years}$$T1/20ν〉9.5×1022years at 90% C.L. This limit corresponds to an effective Majorana neutrino mass limit in the range $$langle m_{ eta eta }
angle le (1.2-2.1),hbox {eV}$$⟨mββ⟩≤(1.2-2.1)eV.
Print ISSN:
1434-6044
Electronic ISSN:
1434-6052
Topics:
Physics
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