Recent results of the Majorana Demonstrator experiment

WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19) Pub Date : 2019-09-16 DOI:10.1063/1.5130979

J. M. López-Castaño, S. Alvis, I. Arnquist, F. T. AvignoneIII, A. Barabash, C. Barton, V. Basu, F. Bertrand, B. Bos, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Yuen-Dat Chan, Cabot-Ann Christofferson, Ph Chu, M. Clark, C. Cuesta, J. Detwiler, A. Drobizhev, D. Edwins, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. P. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, R. Hegedus, R. Henning, D. H. Aguilar, E. Hoppe, A. Hostiuc, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, E. L. Martin, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, T. Oli, G. Othman, W. Pettus, A. Piliounis, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, N. Ruof, B. Shanks, M. Shirchenko, D. Tedeschi, R. L. Varner, S. Vasilyev, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C. H. Yu, V. Yumatov, I. Zhitnikov, B. Zhu

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Abstract

The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.

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马约拉纳演示实验的最新结果

马约拉纳演示器正在用两个模块阵列的天然锗和富集76Ge的锗探测器寻找76Ge中的中微子双β衰变。它位于美国南达科他州铅市桑福德地下研究设施4850英尺的高度，其锗探测器总质量为44.1千克，其中29.7千克为富集。对前26 kg- year数据的分析提供了前所未有的能量分辨率0.13%，在2039 keV的感兴趣区域和15.4±2.0计数/(FWHM t yr)的背景水平。在76Ge中，在90% CL条件下，确定了中微子双β衰变半衰期的下限为2.7 1025 yr。这个分析将在这里进行总结，重点放在能量的确定上。马约拉纳演示器正在用两个模块阵列的天然锗和富集76Ge的锗探测器寻找76Ge中的中微子双β衰变。它位于美国南达科他州铅市桑福德地下研究设施4850英尺的高度，其锗探测器总质量为44.1千克，其中29.7千克为富集。对前26 kg- year数据的分析提供了前所未有的能量分辨率0.13%，在2039 keV的感兴趣区域和15.4±2.0计数/(FWHM t yr)的背景水平。在76Ge中，在90% CL条件下，确定了中微子双β衰变半衰期的下限为2.7 1025 yr。这个分析将在这里进行总结，重点放在能量的确定上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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