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Title: A search for cosmogenic production of β-neutron emitting radionuclides in water

Here we present the first results of WATCHBOY, a water Cherenkov detector designed to measure the yield of β-neutron emitting radionuclides produced by cosmic ray muons in water. In addition to the β-neutron measurement, we also provide a first look at isolating single-β producing radionuclides following muon-induced hadronic showers as a check of the detection capabilities of WATCHBOY. The data taken over 207 live days indicates a 9Li production yield upper limit of $$1.9\times10^{-7}\mu^{-1}g^{-1}\mathrm{cm}^2$$ at $$\sim400$$ meters water equivalent (m.w.e.) overburden at the 90% confidence level. In this work the 9Li signal in WATCHBOY was used as a proxy for the combined search for 9Li and 8He production. This result will provide a constraint on estimates of antineutrino-like backgrounds in future water-based antineutrino detectors.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of California, Davis, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  4. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-677613; SAND-2015-8590J
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC52-07NA27344; AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; cosmogenic radionuclides; antineutrino; muon; spallation; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1241987
Alternate Identifier(s):
OSTI ID: 1254323; OSTI ID: 1359640

Dazeley, S., Askins, M., Bergevin, M., Bernstein, A., Bowden, N. S., Shokair, T. M., Jaffke, P., Rountree, S. D., and Sweany, M.. A search for cosmogenic production of β-neutron emitting radionuclides in water. United States: N. p., Web. doi:10.1016/j.nima.2016.03.014.
Dazeley, S., Askins, M., Bergevin, M., Bernstein, A., Bowden, N. S., Shokair, T. M., Jaffke, P., Rountree, S. D., & Sweany, M.. A search for cosmogenic production of β-neutron emitting radionuclides in water. United States. doi:10.1016/j.nima.2016.03.014.
Dazeley, S., Askins, M., Bergevin, M., Bernstein, A., Bowden, N. S., Shokair, T. M., Jaffke, P., Rountree, S. D., and Sweany, M.. 2016. "A search for cosmogenic production of β-neutron emitting radionuclides in water". United States. doi:10.1016/j.nima.2016.03.014. https://www.osti.gov/servlets/purl/1241987.
@article{osti_1241987,
title = {A search for cosmogenic production of β-neutron emitting radionuclides in water},
author = {Dazeley, S. and Askins, M. and Bergevin, M. and Bernstein, A. and Bowden, N. S. and Shokair, T. M. and Jaffke, P. and Rountree, S. D. and Sweany, M.},
abstractNote = {Here we present the first results of WATCHBOY, a water Cherenkov detector designed to measure the yield of β-neutron emitting radionuclides produced by cosmic ray muons in water. In addition to the β-neutron measurement, we also provide a first look at isolating single-β producing radionuclides following muon-induced hadronic showers as a check of the detection capabilities of WATCHBOY. The data taken over 207 live days indicates a 9Li production yield upper limit of $1.9\times10^{-7}\mu^{-1}g^{-1}\mathrm{cm}^2$ at $\sim400$ meters water equivalent (m.w.e.) overburden at the 90% confidence level. In this work the 9Li signal in WATCHBOY was used as a proxy for the combined search for 9Li and 8He production. This result will provide a constraint on estimates of antineutrino-like backgrounds in future water-based antineutrino detectors.},
doi = {10.1016/j.nima.2016.03.014},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {3}
}