Search for Neutrinoless Double-β Decay with the Complete EXO-200 Dataset

被引:198
作者
Anton, G. [1 ]
Badhrees, I [2 ,30 ]
Barbeau, P. S. [3 ,4 ]
Beck, D. [5 ]
Belov, V [6 ]
Bhatta, T. [7 ]
Breidenbach, M. [8 ]
Brunner, T. [9 ,10 ]
Cao, G. F. [11 ]
Cen, W. R. [11 ]
Chambers, C. [9 ,12 ]
Cleveland, B. [13 ,31 ]
Coon, M. [5 ]
Craycraft, A. [12 ]
Daniels, T. [14 ]
Danilov, M. [6 ,32 ]
Darroch, L. [9 ]
Daugherty, S. J. [15 ,16 ]
Davis, J. [8 ]
Delaquis, S. [8 ]
Mesrobian-Kabakian, A. Der [13 ]
DeVoe, R. [17 ]
Dilling, J. [10 ]
Dolgolenko, A. [6 ]
Dolinski, M. J. [18 ]
Echevers, J. [5 ]
Fairbank, W., Jr. [12 ]
Fairbank, D. [12 ]
Farine, J. [13 ]
Feyzbakhsh, S. [19 ,20 ]
Fierlinger, P. [21 ,22 ]
Fudenberg, D. [17 ]
Gautam, P. [18 ]
Gornea, R. [2 ,10 ]
Gratta, G. [17 ]
Hall, C. [23 ]
Hansen, E., V [18 ]
Hoessl, J. [1 ]
Hufschmidt, P. [1 ]
Hughes, M. [24 ]
Iverson, A. [12 ]
Jamil, A. [25 ]
Jessiman, C. [2 ]
Jewell, M. J. [17 ]
Johnson, A. [8 ]
Karelin, A. [6 ]
Kaufman, L. J. [8 ,15 ,16 ,33 ]
Koffas, T. [2 ]
Krucken, R. [10 ]
Kuchenkov, A. [6 ]
机构
[1] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[2] Carleton Univ, Phys Dept, Ottawa, ON K1S 5B6, Canada
[3] Duke Univ, Dept Phys, Durham, NC 27708 USA
[4] Triangle Univ Nucl Lab, Durham, NC 27708 USA
[5] Univ Illinois, Phys Dept, Urbana, IL 61801 USA
[6] Natl Res Ctr Kurchatov Inst, Inst Theoret & Expt Phys, Moscow 117218, Russia
[7] Univ South Dakota, Dept Phys, Vermillion, SD 57069 USA
[8] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
[9] McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada
[10] TRIUMF, Vancouver, BC V6T 2A3, Canada
[11] Inst High Energy Phys, Beijing 100049, Peoples R China
[12] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA
[13] Laurentian Univ, Dept Phys, Sudbury, ON P3E 2C6, Canada
[14] Univ North Carolina Wilmington, Dept Phys & Phys Oceanog, Wilmington, NC 28403 USA
[15] Indiana Univ, Phys Dept, Bloomington, IN 47405 USA
[16] Indiana Univ, CEEM, Bloomington, IN 47405 USA
[17] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[18] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA
[19] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA
[20] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA
[21] Tech Univ Munich, Phys Dept, D-80805 Garching, Germany
[22] Tech Univ Munich, Excellence Cluster Universe, D-80805 Garching, Germany
[23] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[24] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA
[25] Yale Univ, Dept Phys, Wright Lab, New Haven, CT 06511 USA
[26] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[27] IBS Ctr Underground Phys, Daejeon 34126, South Korea
[28] CALTECH, Kellogg Lab, Pasadena, CA 91125 USA
[29] Univ Bern, Albert Einstein Ctr, LHEP, CH-3012 Bern Ch, Switzerland
[30] King Abdulaziz City Sci & Technol, Riyadh, Saudi Arabia
[31] SNOLAB, Sudbury, ON, Canada
[32] Russian Acad Sci, PN Lebedev Phys Inst, Moscow, Russia
[33] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA
基金
加拿大自然科学与工程研究理事会;
关键词
Particle detectors - Neutrons;
D O I
10.1103/PhysRevLett.123.161802
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A search for neutrinoless double-beta decay (0 nu beta beta) in Xe-136 is performed with the full EXO-200 dataset using a deep neural network to discriminate between 0 nu beta beta and background events. Relative to previous analyses, the signal detection efficiency has been raised from 80.8% to 96.4 +/- 3.0%, and the energy resolution of the detector at the Q value of Xe-136 0 nu beta beta has been improved from sigma/E = 1.23% to 1.15 +/- 0.02% with the upgraded detector. Accounting for the new data, the median 90% confidence level 0 nu beta beta half-life sensitivity for this analysis is 5.0 x 10(25) yr with a total Xe-136 exposure of 234.1 kg yr. No statistically significant evidence for 0 nu beta beta is observed, leading to a lower limit on the 0 nu beta beta half-life of 3.5 x 10(25) yr at the 90% confidence level.
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页数:7
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