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Measurement of Cosmic-ray Muons and Muon-induced Neutrons in the Aberdeen Tunnel Underground Laboratory

  • Blyth, S. C.
  • Chan, Y. L.
  • Chen, X. C.
  • Chu, M. C.
  • Cui, K. X.
  • Hahn, R. L.
  • Ho, T. H.
  • Hor, Y. K.
  • Hsiung, Y. B.
  • Hu, B. Z.
  • Kwan, K. K.
  • Kwok, M. W.
  • Kwok, T.
  • Lau, Y. P.
  • Lee, K. P.
  • Leung, J. K. C.
  • Leung, K. Y.
  • Lin, G. L.
  • Lin, Y. C.
  • Luk, K. B.
  • And 14 more
Published Article
Publication Date
Nov 26, 2016
Submission Date
Sep 30, 2015
DOI: 10.1103/PhysRevD.93.072005
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We have measured the muon flux and production rate of muon-induced neutrons at a depth of 611 m water equivalent. Our apparatus comprises three layers of crossed plastic scintillator hodoscopes for tracking the incident cosmic-ray muons and 760 L of gadolinium-doped liquid scintillator for producing and detecting neutrons. The vertical muon intensity was measured to be $I_{\mu} = (5.7 \pm 0.6) \times 10^{-6}$ cm$^{-2}$s$^{-1}$sr$^{-1}$. The yield of muon-induced neutrons in the liquid scintillator was determined to be $Y_{n} = (1.19 \pm 0.08 (stat) \pm 0.21 (syst)) \times 10^{-4}$ neutrons/($\mu\cdot$g$\cdot$cm$^{-2}$). A fit to the recently measured neutron yields at different depths gave a mean muon energy dependence of $\left\langle E_{\mu} \right\rangle^{0.76 \pm 0.03}$ for liquid-scintillator targets.

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