In:
The European Physical Journal C, Springer Science and Business Media LLC, Vol. 79, No. 9 ( 2019-09)
Kurzfassung:
The advanced molybdenum-based rare process experiment (AMoRE) aims to search for neutrinoless double beta decay ( $$0\nu \beta \beta $$ 0 ν β β ) of $$^{100}$$ 100 Mo with $$\sim 100\,\hbox {kg}$$ ∼ 100 kg of $$^{100}$$ 100 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 $$^{48}$$ 48 Ca-depleted calcium and $$^{100}$$ 100 Mo-enriched molybdenum ( $$^{48{{\text {depl}}}}\hbox {Ca}^{100}\hbox {MoO}_{4}$$ 48 depl Ca 100 MoO 4 ). 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 $$0\nu \beta \beta $$ 0 ν β β search with a 111 kg day live exposure of $$^{48{{\text {depl}}}}\hbox {Ca}^{100}\hbox {MoO}_{4}$$ 48 depl Ca 100 MoO 4 crystals. No evidence for $$0\nu \beta \beta $$ 0 ν β β decay of $$^{100}$$ 100 Mo is found, and a upper limit is set for the half-life of $$0\nu \beta \beta $$ 0 ν β β of $$^{100}$$ 100 Mo of $$T^{0\nu }_{1/2} 〉 9.5\times 10^{22}~\hbox {years}$$ T 1 / 2 0 ν 〉 9.5 × 10 22 years at 90% C.L. This limit corresponds to an effective Majorana neutrino mass limit in the range $$\langle m_{\beta \beta }\rangle \le (1.2-2.1)\,\hbox {eV}$$ ⟨ m β β ⟩ ≤ ( 1.2 - 2.1 ) eV .
Materialart:
Online-Ressource
ISSN:
1434-6044
,
1434-6052
DOI:
10.1140/epjc/s10052-019-7279-1
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2019
ZDB Id:
1397769-6
ZDB Id:
1459069-4
