The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in 76Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in 76Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. In this paper, we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Qββ and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9 × 1025 yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0$$+3.1\atop{-2.5}$$ counts/(FWHM t yr).
Aalseth, C. E., et al. "Search for Neutrinoless Double- <math display='inline'><mi>β</mi></math> Decay in <math display='inline'><mrow><mmultiscripts><mrow><mi>Ge</mi></mrow><mprescripts/><none/><mrow><mn>76</mn></mrow></mmultiscripts></mrow></math> with the Majorana Demonstrator." Physical Review Letters, vol. 120, no. 13, Mar. 2018. https://doi.org/10.1103/PhysRevLett.120.132502
Aalseth, C. E., Abgrall, N., Aguayo, E., Alvis, S. I., Amman, M., Arnquist, I. J., Avignone, F. T., Back, H. O., Barabash, A. S., Barbeau, P. S., Barton, C. J., Barton, P. J., Bertrand, F. E., Bode, T., Bos, B., Boswell, M., Bradley, A. W., Brodzinski, R. L., ... Zimmermann, S. (2018). Search for Neutrinoless Double- <math display='inline'><mi>β</mi></math> Decay in <math display='inline'><mrow><mmultiscripts><mrow><mi>Ge</mi></mrow><mprescripts/><none/><mrow><mn>76</mn></mrow></mmultiscripts></mrow></math> with the Majorana Demonstrator. Physical Review Letters, 120(13). https://doi.org/10.1103/PhysRevLett.120.132502
Aalseth, C. E., Abgrall, N., Aguayo, E., et al., "Search for Neutrinoless Double- <math display='inline'><mi>β</mi></math> Decay in <math display='inline'><mrow><mmultiscripts><mrow><mi>Ge</mi></mrow><mprescripts/><none/><mrow><mn>76</mn></mrow></mmultiscripts></mrow></math> with the Majorana Demonstrator," Physical Review Letters 120, no. 13 (2018), https://doi.org/10.1103/PhysRevLett.120.132502
@article{osti_1436672,
author = {Aalseth, C. E. and Abgrall, N. and Aguayo, E. and Alvis, S. I. and Amman, M. and Arnquist, I. J. and Avignone, F. T. and Back, H. O. and Barabash, A. S. and Barbeau, P. S. and others},
title = {Search for Neutrinoless Double- <math display='inline'><mi>β</mi></math> Decay in <math display='inline'><mrow><mmultiscripts><mrow><mi>Ge</mi></mrow><mprescripts/><none/><mrow><mn>76</mn></mrow></mmultiscripts></mrow></math> with the Majorana Demonstrator},
annote = {The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in 76Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in 76Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. In this paper, we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Qββ and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9 × 1025 yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0$+3.1\atop{-2.5}$ counts/(FWHM t yr).},
doi = {10.1103/PhysRevLett.120.132502},
url = {https://www.osti.gov/biblio/1436672},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {13},
volume = {120},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2018},
month = {03}}
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
National Science Foundation (NSF); Russian Foundation for Basic Research; Sanford Underground Research Facility (SURF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
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