Cosmogenic neutron production at Daya Bay.
2017
Neutrons produced by cosmic ray muons are an important background for underground experiments studying
neutrino oscillations, neutrinoless
double beta decay, dark matter, and other
rare-eventsignals. A measurement of the neutron yield in the three different experimental halls of the
Daya Bay Reactor Neutrino Experimentat varying depth is reported. The neutron yield in Daya Bay's liquid scintillator is measured to be $Y_n=(10.26\pm 0.86)\times 10^{-5}$, $(10.22\pm 0.87)\times 10^{-5}$, and $(17.03\pm 1.22)\times 10^{-5}~\mu^{-1}~$g$^{-1}~$cm$^2$ at depths of 250, 265, and 860
meters-water-equivalent. These results are compared to other measurements and the simulated neutron yield in Fluka and Geant4. A global fit including the Daya Bay measurements yields a power law coefficient of $0.77 \pm 0.03$ for the dependence of the neutron yield on muon energy.
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