Measurement of muon-induced high-energy neutrons from rock in an underground Gd-doped water detector

Sutanto, F.; Akindele, O. A.; Askins, M.; Bergevin, M.; Bernstein, A.; Bowden, N. S.; Dazeley, S.; Jaffke, P.; Jovanovic, I.; Quillin, S.; Roecker, C.; Rountree, S. D.

doi:10.1103/physrevc.102.034616

Title: Measurement of muon-induced high-energy neutrons from rock in an underground Gd-doped water detector

Journal Article · Mon Sep 28 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.034616· OSTI ID:1673198

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Univ. of Michigan, Ann Arbor, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Davis, CA (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Atomic Weapons Research Establishment (AWRE), Aldermaston (United Kingdom)
Univ. of California, Berkeley, CA (United States)

We present a measurement of the rate of correlated neutron captures in the WATCHBOY detector, deployed at a depth of approximately 390 meters water equivalent (m.w.e.) in the Kimballton Underground Research Facility (KURF). WATCHBOY consists of a cylindrical 2 ton water target doped with 0.1% gadolinium, surrounded by a 40 ton undoped water hermetic shield. We present a comparison of our results with the expected rate of correlated neutron captures arising from high-energy neutrons incident on the outside of the WATCHBOY shield, predicted by a hybrid FLUKA/GEANT4-based simulation. The incident neutron energy distribution used in the simulation was measured by a fast neutron spectrometer, the 1.8-ton Multiplicity and Recoil Spectrometer (MARS) detector, at the same depth. We find that the measured detection rate of two correlated neutrons is consistent with that predicted by simulation. The result lends additional confidence in the detection technique used by MARS, and therefore in the MARS spectra as measured at three diferent depths. Confirmation of the fast neutron flux and spectrum is important as it helps validate the scaling models used to predict the fast neutron fluxes at different overburdens.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0002534; NA0003920

OSTI ID:: 1673198

Alternate ID(s):: OSTI ID: 1695701

Report Number(s):: LLNL-JRNL-796592; 998324; TRN: US2203934

Journal Information:: Physical Review C, Vol. 102, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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