The Majorana Demonstrator Status and Preliminary Results

arXiv: Nuclear Experiment Pub Date : 2018-03-29 DOI:10.1051/epjconf/201817801006

C. -. Yu, S. Alvis, I. Arnquist, F. Avignone, A. Barabash, C. Barton, F. Bertrand, T. Bode, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Y. Chan, C. Christofferson, P. Chu, C. Cuesta, J. Detwiler, C. Dunagan, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, L. Hehn, R. Henning, E. Hoppe, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, G. Othman, W. Pettus, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, N. Ruff, B. Shanks, M. Shirchenko, A. Suriano, D. Tedeschi, R. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, V. Yumatov, I. Zhitnikov, B. M. L. A. N. Laboratory, Oak Ridge, Tn, Usa, Center for High Energy Physics, Astrophysics, D. Physics, U. Washington, Wa, P. N. N. Laboratory, Richland, Astronomy, U. O. N. Carolina, Columbia, Sc, N. Center, K. Institute, Institute for Theoretical, E. Physics, Moscow,

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引用次数: 1

Abstract

The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{\beta\beta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.

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马约拉纳示范现状及初步结果

马约拉纳合作小组正在使用一组高纯度的锗探测器来寻找76Ge中的中微子双β衰变。寻找无中微子的双β衰变被认为是测试中微子马约拉纳性质的唯一可行的实验方法。对这种衰变的观测将意味着轻子数的违反，即中微子在本质上是马约拉纳的，并提供有关中微子质量的信息。马约拉纳演示器由44.1千克p型点接触锗探测器(富集76Ge 29.7千克)组成，周围是低背景屏蔽系统。实验实现了将原始锗材料高效率地转化为探测器，并在Q$_{\beta\beta}$处获得了前所未有的2.5 keV FWHM探测器能量分辨率。马约拉纳项目于2016年开始采集物理数据。本文总结了验证机的关键构造方面，并从初始数据中给出了初步结果。

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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arXiv: Nuclear Experiment

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