학술논문
Improved limit on neutrinoless double beta decay of \mohundred~from AMoRE-I
Document Type
Working Paper
Author
Agrawal, A.; Alenkov, V. V.; Aryal, P.; Beyer, J.; Bhandari, B.; Boiko, R. S.; Boonin, K.; Buzanov, O.; Byeon, C. R.; Chanthima, N.; Cheoun, M. K.; Choe, J. S.; Choi, Seonho; Choudhury, S.; Chung, J. S.; Danevich, F. A.; Djamal, M.; Drung, D.; Enss, C.; Fleischmann, A.; Gangapshev, A. M.; Gastaldo, L.; Gavrilyuk, Y. M.; Gezhaev, A. M.; Gileva, O.; Grigorieva, V. D.; Gurentsov, V. I.; Ha, C.; Ha, D. H.; Ha, E. J.; Hwang, D. H.; Jeon, E. J.; Jeon, J. A.; Jo, H. S.; Kaewkhao, J.; Kang, C. S.; Kang, W. G.; Kazalov, V. V.; Kempf, S.; Khan, A.; Khan, S.; Kim, D. Y.; Kim, G. W.; Kim, H. B.; Kim, Ho-Jong; Kim, H. J.; Kim, H. L.; Kim, H. S.; Kim, M. B.; Kim, S. C.; Kim, S. K.; Kim, S. R.; Kim, W. T.; Kim, Y. D.; Kim, Y. H.; Kirdsiri, K.; Ko, Y. J.; Kobychev, V. V.; Kornoukhov, V.; Kuzminov, V. V.; Kwon, D. H.; Lee, C. H.; Lee, DongYeup; Lee, E. K.; Lee, H. J.; Lee, H. S.; Lee, J.; Lee, J. Y.; Lee, K. B.; Lee, M. H.; Lee, M. K.; Lee, S. W.; Lee, Y. C.; Leonard, D. S.; Lim, H. S.; Mailyan, B.; Makarov, E. P.; Nyanda, P.; Oh, Y.; Olsen, S. L.; Panasenko, S. I.; Park, H. K.; Park, H. S.; Park, K. S.; Park, S. Y.; Polischuk, O. G.; Prihtiadi, H.; Ra, S.; Ratkevich, S. S.; Rooh, G.; Sari, M. B.; Seo, J.; Seo, K. M.; Sharma, B.; Shin, K. A.; Shlegel, V. N.; Siyeon, K.; So, J.; Sokur, N. V.; Son, J. K.; Song, J. W.; Srisittipokakun, N.; Tretyak, V. I.; Wirawan, R.; Woo, K. R.; Yeon, H. J.; Yoon, Y. S.; Yue, Q.
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Abstract
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 $0\nu\beta\beta$ decay and report a new lower limit of the half-life of $^{100}$Mo $0\nu\beta\beta$ decay as $ T^{0\nu}_{1/2}>3.0\times10^{24}~\mathrm{years}$ at 90\% confidence level. The effective Majorana mass limit range is $m_{\beta\beta}<$(210--610) meV using nuclear matrix elements estimated in the framework of different models, including the recent shell model calculations.
Comment: 7 pages, 4 figures
Comment: 7 pages, 4 figures