Cosmogenic backgrounds to 0νββ in EXO-200

被引：25

作者：

Albert, J. B. ^{[1
,2
]}

Auty, D. J. ^{[3
,27
]}

Barbeau, P. S. ^{[4
,5
]}

Beck, D. ^{[6
]}

Belov, V. ^{[7
]}

Breidenbach, M. ^{[8
]}

Brunner, T. ^{[9
,10
]}

Burenkov, A. ^{[7
]}

Cao, G. F. ^{[11
]}

Chambers, C. ^{[12
]}

Cleveland, B. ^{[13
,28
]}

Coon, M. ^{[6
]}

Craycraft, A. ^{[12
]}

Daniels, T. ^{[8
]}

Danilov, M. ^{[7
]}

Daugherty, S. J. ^{[1
,2
]}

Davis, J. ^{[8
]}

Delaquis, S. ^{[14
]}

Der Mesrobian-Kabakian, A. ^{[13
]}

DeVoe, R. ^{[15
]}

Didberidze, T. ^{[3
]}

Dilling, J. ^{[10
]}

Dolgolenko, A. ^{[7
]}

Dolinski, M. J. ^{[16
]}

Dunford, M. ^{[17
]}

Fairbank, W., Jr. ^{[12
]}

Farine, J. ^{[13
]}

Feldmeier, W. ^{[18
,19
]}

Feyzbakhsh, S.

Fierlinger, P. ^{[18
,19
]}

Fudenberg, D. ^{[15
]}

Gornea, R. ^{[10
,17
]}

Graham, K. ^{[17
]}

Gratta, G. ^{[15
]}

Hall, C. ^{[22
]}

Herrin, S. ^{[8
]}

Hughes, M. ^{[3
]}

Jewell, M. J. ^{[15
]}

Johnson, A. ^{[8
]}

Johnson, T. N. ^{[1
,2
]}

Johnston, S. ^{[20
,21
]}

Karelin, A. ^{[4
,5
]}

Kaufman, L. J. ^{[1
,2
]}

Killick, R. ^{[17
]}

Koffas, T. ^{[17
]}

Kravitz, S. ^{[15
]}

Krucken, R. ^{[10
]}

Kuchenkov, A. ^{[7
]}

Kumar, K. S. ^{[23
]}

Leonard, D. S. ^{[24
]}

机构：

[1] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[2] Indiana Univ, CEEM, Bloomington, IN 47405 USA

[3] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[4] Duke Univ, Dept Phys, Durham, NC 27708 USA

[5] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[6] Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA

[7] Inst Theoret & Expt Phys, Moscow, Russia

[8] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[9] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[10] TRIUMF, Vancouver, BC V6T 2A3, Canada

[11] Inst High Energy Phys, Beijing, 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 Bern, Albert Einstein Ctr, LHEP, Bern, Switzerland

[15] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[16] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[17] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[18] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[19] Tech Univ Munich, Excellence Cluster Universe, D-85748 Garching, Germany

[20] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA

[21] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[22] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[23] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[24] IBS Ctr Underground Phys, Daejeon, South Korea

[25] Univ South Dakota, Dept Phys, Vermillion, SD 57069 USA

[26] Waste Isolat Pilot Plant, Carlsbad, NM 88220 USA

[27] Univ Alberta, Edmonton, AB, Canada

[28] SNOLAB, Sudbury, ON, Canada

[29] Sun Yat Sen Univ, Guangzhou, Guangdong, Peoples R China

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2016年 / 04期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

double beta decay; cosmic ray experiments; neutrino experiments; NUCLEAR-DATA SHEETS; ENERGY-LEVELS; LIGHT-NUCLEI; SIMULATION; DECAY;

D O I：

10.1088/1475-7516/2016/04/029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background must be understood and eliminated. With this in mind, cosmogenic backgrounds have been studied with the EXO-200 experiment. Using the EXO-200 TPC, the muon flux (through a flat horizontal surface) underground at the Waste Isolation Pilot Plant (WIPP) has been measured to be Phi = 4.07 +/- 0.14 (sys) +/- 0.03 (stat) x 10(-7) cm(-2) s(-1), with a vertical intensity of I-v = 2.97(-0.13)(+0.14) (sys) +/- 0.02 (stat) x 10(-7) cm(-2) s(-1) sr(-1). Simulations of muon-induced backgrounds identified several potential cosmogenic radionuclides, though only Xe-137 is a significant background for the Xe-136 0v beta beta search with EXO-200. Muon-induced neutron backgrounds were measured using gamma-rays from neutron capture on the detector materials. This provided a measurement of Xe-137 yield, and a test of the accuracy of the neutron p roduction and transport simulations. The independently measured rates of Xe-137 neutron capture and of Xe-137 decay agree within uncertainties. Geant4 and FLUKA simulations were performed to estimate neutron capture rates, and these estimates agreed to within similar to 40% or better with measurements. The ability to identify Xe-136(n, gamma) events will allow for rejection of Xe-137 backgrounds in future 0v beta beta analyses.

引用

页数：29

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