Recent results of the M ajorana D emonstrator experiment

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationWorkshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019
EditorsOsvaldo Civitarese, Ivan Stekl, Jouni Suhonen
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419100
DOIs
StatePublished - Oct 25 2019
Event12th Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019 - Prague, Czech Republic
Duration: May 27 2019May 31 2019

Publication series

NameAIP Conference Proceedings
Volume2165
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference12th Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019
Country/TerritoryCzech Republic
CityPrague
Period05/27/1905/31/19

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs ofthe National Science Foundation, and the Sanford Underground Research Facility. It is also funded by the National Science Foundation under Grant No. 1812356.

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