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Title: Search for neutrinoless double- β decay in Ge 76 with 26 kg yr of exposure from the Majorana Demonstrator

Abstract

The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of $$^{76}$$Ge. The MAJORANA DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in $$^{76}$$Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in $$^{76}$$Ge with $$26.0\pm0.5$$ kg-yr of enriched exposure. With the DEMONSTRATOR's unprecedented energy resolution of 2.53 keV FWHM at $$Q_{\beta\beta}$$, we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the $$^{76}$$Ge neutrinoless double-beta decay half-life of $$2.7\times10^{25}$$ yr (90% CL) with a median sensitivity of $$4.8\times10^{25}$$ yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is $$11.9\pm2.0$$ counts/(FWHM t yr).

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
Majorana Collaboration
OSTI Identifier:
1564073
Alternate Identifier(s):
OSTI ID: 1558732
Grant/Contract Number:  
AC02-05CH11231; AC05-00OR22725; AC05-76RL0130; AC52-06NA25396; FG02-97ER41020; FG02-97ER41033; FG02-97ER41041; SC0010254; SC0012612; SC0014445; SC0018060
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Basu, V., Bertrand, F. E., Bos, B., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y-D., Christofferson, C. D., Chu, P. -H., Clark, M., Cuesta, C., Detwiler, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hegedus, R. J., Hehn, L., Henning, R., Hervas Aguilar, D., Hoppe, E. W., Howe, M. A., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., Othman, G., Pettus, W., Piliounis, A., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Ruof, N. W., Shanks, B., Shirchenko, M., Tedeschi, D., Varner, R. L., Vasilyev, S., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C. -H., Yumatov, V., Zhitnikov, I., and Zhu, B. X. Search for neutrinoless double-β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator. United States: N. p., 2019. Web. doi:10.1103/physrevc.100.025501.
Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Basu, V., Bertrand, F. E., Bos, B., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y-D., Christofferson, C. D., Chu, P. -H., Clark, M., Cuesta, C., Detwiler, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hegedus, R. J., Hehn, L., Henning, R., Hervas Aguilar, D., Hoppe, E. W., Howe, M. A., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., Othman, G., Pettus, W., Piliounis, A., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Ruof, N. W., Shanks, B., Shirchenko, M., Tedeschi, D., Varner, R. L., Vasilyev, S., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C. -H., Yumatov, V., Zhitnikov, I., & Zhu, B. X. Search for neutrinoless double-β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator. United States. doi:10.1103/physrevc.100.025501.
Alvis, S. I., Arnquist, I. J., Avignone, F. T., Barabash, A. S., Barton, C. J., Basu, V., Bertrand, F. E., Bos, B., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y-D., Christofferson, C. D., Chu, P. -H., Clark, M., Cuesta, C., Detwiler, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., Gilliss, T., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Hegedus, R. J., Hehn, L., Henning, R., Hervas Aguilar, D., Hoppe, E. W., Howe, M. A., Kidd, M. F., Konovalov, S. I., Kouzes, R. T., Lopez, A. M., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Myslik, J., Othman, G., Pettus, W., Piliounis, A., Poon, A. W. P., Radford, D. C., Rager, J., Reine, A. L., Rielage, K., Ruof, N. W., Shanks, B., Shirchenko, M., Tedeschi, D., Varner, R. L., Vasilyev, S., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yu, C. -H., Yumatov, V., Zhitnikov, I., and Zhu, B. X. Fri . "Search for neutrinoless double-β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator". United States. doi:10.1103/physrevc.100.025501.
@article{osti_1564073,
title = {Search for neutrinoless double-β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator},
author = {Alvis, S. I. and Arnquist, I. J. and Avignone, F. T. and Barabash, A. S. and Barton, C. J. and Basu, V. and Bertrand, F. E. and Bos, B. and Busch, M. and Buuck, M. and Caldwell, T. S. and Chan, Y-D. and Christofferson, C. D. and Chu, P. -H. and Clark, M. and Cuesta, C. and Detwiler, J. A. and Efremenko, Yu. and Ejiri, H. and Elliott, S. R. and Gilliss, T. and Giovanetti, G. K. and Green, M. P. and Gruszko, J. and Guinn, I. S. and Guiseppe, V. E. and Haufe, C. R. and Hegedus, R. J. and Hehn, L. and Henning, R. and Hervas Aguilar, D. and Hoppe, E. W. and Howe, M. A. and Kidd, M. F. and Konovalov, S. I. and Kouzes, R. T. and Lopez, A. M. and Martin, R. D. and Massarczyk, R. and Meijer, S. J. and Mertens, S. and Myslik, J. and Othman, G. and Pettus, W. and Piliounis, A. and Poon, A. W. P. and Radford, D. C. and Rager, J. and Reine, A. L. and Rielage, K. and Ruof, N. W. and Shanks, B. and Shirchenko, M. and Tedeschi, D. and Varner, R. L. and Vasilyev, S. and White, B. R. and Wilkerson, J. F. and Wiseman, C. and Xu, W. and Yakushev, E. and Yu, C. -H. and Yumatov, V. and Zhitnikov, I. and Zhu, B. X.},
abstractNote = {The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of $^{76}$Ge. The MAJORANA DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in $^{76}$Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in $^{76}$Ge with $26.0\pm0.5$ kg-yr of enriched exposure. With the DEMONSTRATOR's unprecedented energy resolution of 2.53 keV FWHM at $Q_{\beta\beta}$, we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the $^{76}$Ge neutrinoless double-beta decay half-life of $2.7\times10^{25}$ yr (90% CL) with a median sensitivity of $4.8\times10^{25}$ yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is $11.9\pm2.0$ counts/(FWHM t yr).},
doi = {10.1103/physrevc.100.025501},
journal = {Physical Review C},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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