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Cosmogenic backgrounds to 0νββ in EXO-200

Publication ,  Journal Article
Albert, JB; Auty, DJ; Barbeau, PS; Beck, D; Belov, V; Breidenbach, M; Brunner, T; Burenkov, A; Cao, GF; Chambers, C; Cleveland, B; Coon, M ...
Published in: Journal of Cosmology and Astroparticle Physics
April 15, 2016

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 Φ = 4.07 ± 0.14 (sys) ± 0.03 (stat) × 10-7 cm-2 s-1, with a vertical intensity of Iv = 2.97+0.14-0.13 (sys) ± 0.02 (stat) × 10-7 cm-2 s-1 sr-1. Simulations of muon-induced backgrounds identified several potential cosmogenic radionuclides, though only 137Xe is a significant background for the 136Xe 0νββ search with EXO-200. Muon-induced neutron backgrounds were measured using γ-rays from neutron capture on the detector materials. This provided a measurement of 137Xe yield, and a test of the accuracy of the neutron production and transport simulations. The independently measured rates of 136Xe neutron capture and of 137Xe decay agree within uncertainties. Geant4 and FLUKA simulations were performed to estimate neutron capture rates, and these estimates agreed to within ∼ 40% or better with measurements. The ability to identify 136Xe(n,γ) events will allow for rejection of 137Xe backgrounds in future 0νββ analyses.

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Published In

Journal of Cosmology and Astroparticle Physics

DOI

EISSN

1475-7516

Publication Date

April 15, 2016

Volume

2016

Issue

4

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., … Zeldovich, O. Y. (2016). Cosmogenic backgrounds to 0νββ in EXO-200. Journal of Cosmology and Astroparticle Physics, 2016(4). https://doi.org/10.1088/1475-7516/2016/04/029
Albert, J. B., D. J. Auty, P. S. Barbeau, D. Beck, V. Belov, M. Breidenbach, T. Brunner, et al. “Cosmogenic backgrounds to 0νββ in EXO-200.” Journal of Cosmology and Astroparticle Physics 2016, no. 4 (April 15, 2016). https://doi.org/10.1088/1475-7516/2016/04/029.
Albert JB, Auty DJ, Barbeau PS, Beck D, Belov V, Breidenbach M, et al. Cosmogenic backgrounds to 0νββ in EXO-200. Journal of Cosmology and Astroparticle Physics. 2016 Apr 15;2016(4).
Albert, J. B., et al. “Cosmogenic backgrounds to 0νββ in EXO-200.” Journal of Cosmology and Astroparticle Physics, vol. 2016, no. 4, Apr. 2016. Scopus, doi:10.1088/1475-7516/2016/04/029.
Albert JB, Auty DJ, Barbeau PS, Beck D, Belov V, Breidenbach M, Brunner T, Burenkov A, Cao GF, Chambers C, Cleveland B, Coon M, Craycraft A, Daniels T, Danilov M, Daugherty SJ, Davis J, Delaquis S, Mesrobian-Kabakian AD, Devoe R, Didberidze T, Dilling J, Dolgolenko A, Dolinski MJ, Dunford M, Fairbank W, Farine J, Feldmeier W, Feyzbakhsh S, Fierlinger P, Fudenberg D, Gornea R, Graham K, Gratta G, Hall C, Herrin S, Hughes M, Jewell MJ, Johnson A, Johnson TN, Johnston S, Karelin A, Kaufman LJ, Killick R, Koffas T, Kravitz S, Krücken R, Kuchenkov A, Kumar KS, Leonard DS, Licciardi C, Lin YH, Ling J, Maclellan R, Marino MG, Mong B, Moore D, Njoya O, Nelson R, Odian A, Ostrovskiy I, Piepke A, Pocar A, Prescott CY, Retière F, Rowson PC, Russell JJ, Schubert A, Sinclair D, Smith E, Stekhanov V, Tarka M, Tolba T, Tsang R, Twelker K, Vuilleumier JL, Waite A, Walton J, Walton T, Weber M, Wen LJ, Wichoski U, Wood J, Yang L, Yen YR, Zeldovich OY. Cosmogenic backgrounds to 0νββ in EXO-200. Journal of Cosmology and Astroparticle Physics. 2016 Apr 15;2016(4).
Journal cover image

Published In

Journal of Cosmology and Astroparticle Physics

DOI

EISSN

1475-7516

Publication Date

April 15, 2016

Volume

2016

Issue

4

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences