Improved limit on neutrinoless double beta decay of $^{100}$Mo from AMoRE-I
Creators: name: Agrawal, A.
name: Alenkov, V. V.
name: Aryal, P.
name: Beyer, J.
name: Bhandari, B.
name: Boiko, R. S.
name: Boonin, K.
name: Buzanov, O.
name: Byeon, C. R.
name: Chanthima, N.
name: Cheoun, M. K.
name: Choe, J. S.
name: Choi, Seonho
name: Choudhury, S.
name: Chung, J. S.
name: Danevich, F. A.
name: Djamal, M.
name: Drung, D.
name: Enss, C.
name: Fleischmann, A.
name: Gangapshev, A. M.
name: Gastaldo, L.
name: Gavrilyuk, Y. M.
name: Gezhaev, A. M.
name: Gileva, O.
name: Grigorieva, V. D.
name: Gurentsov, V. I.
name: Ha, C.
name: Ha, D. H.
name: Ha, E. J.
name: Hwang, D. H.
name: Jeon, E. J.
name: Jeon, J. A.
name: Jo, H. S.
name: Kaewkhao, J.
name: Kang, C. S.
name: Kang, W. G.
name: Kazalov, V. V.
name: Kempf, S.
name: Khan, A.
name: Khan, S.
name: Kim, D. Y.
name: Kim, G. W.
name: Kim, H. B.
name: Kim, Ho-Jong
name: Kim, H. J.
name: Kim, H. L.
name: Kim, H. S.
name: Kim, M. B.
name: Kim, S. C.
name: Kim, S. K.
name: Kim, S. R.
name: Kim, W. T.
name: Kim, Y. D.
name: Kim, Y. H.
name: Kirdsiri, K.
name: Ko, Y. J.
name: Kobychev, V. V.
name: Kornoukhov, V.
name: Kuzminov, V. V.
name: Kwon, D. H.
name: Lee, C. H.
name: Lee, DongYeup
name: Lee, E. K.
name: Lee, H. J.
name: Lee, H. S.
name: Lee, J.
name: Lee, J. Y.
name: Lee, K. B.
name: Lee, M. H.
name: Lee, M. K.
name: Lee, S. W.
name: Lee, Y. C.
name: Leonard, D. S.
name: Lim, H. S.
name: Mailyan, B.
name: Makarov, E. P.
name: Nyanda, P.
name: Oh, Y.
name: Olsen, S. L.
name: Panasenko, S. I.
name: Park, H. K.
name: Park, H. S.
name: Park, K. S.
name: Park, S. Y.
name: Polischuk, O. G.
name: Prihtiadi, H.
name: Ra, S.
name: Ratkevich, S. S.
name: Rooh, G.
name: Sari, M. B.
name: Seo, J.
name: Seo, K. M.
name: Sharma, B.
name: Shin, K. A.
name: Shlegel, V. N.
name: Siyeon, K.
name: So, J.
name: Sokur, N. V.
name: Son, J. K.
name: Song, J. W.
name: Srisittipokakun, N.
name: Tretyak, V. I.
name: Wirawan, R.
name: Woo, K. R.
name: Yeon, H. J.
name: Yoon, Y. S.
name: Yue, Q.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: AMoRE searches for the signature of neutrinoless double beta decay of $^{100}$Mo with a 100 kg sample of enriched $^{100}$Mo. Scintillating molybdate crystals coupled with a metallic magnetic calorimeter operate at milli-Kelvin temperatures to measure the energy of electrons emitted in the decay. As a demonstration of the full-scale AMoRE, we conducted AMoRE-I, a pre-experiment with 18 molybdate crystals, at the Yangyang Underground Laboratory for over two years. The exposure was 8.02 kg$\cdot$year (or 3.89 kg$_{\mathrm{^{100}Mo}}\cdot$year) and the total background rate near the Q-value was 0.025 $\pm$ 0.002 counts/keV/kg/year. We observed no indication of $0νββ$ decay and report a new lower limit of the half-life of $^{100}$Mo $0νββ$ decay as $ T^{0ν}_{1/2}&gt;2.9\times10^{24}~\mathrm{yr}$ at 90\% confidence level. The effective Majorana mass limit range is $m_{ββ}&lt;$(210--610) meV using nuclear matrix elements estimated in the framework of different models, including the recent shell model calculations.
description: 7 pages, 5 figures