Using 1440 hours of neutron multiplicity data at 1166 m.w.e., the authors set 90% upper limits on dark matter-nucleus cross sections under the assumption that all dark matter mass energy converts to hadronic energy in a lead target.
Neutron- and muon-induced background in underground physics experiments
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abstract
Background induced by neutrons in deep underground laboratories is a critical issue for all experiments looking for rare events, such as dark matter interactions or neutrinoless 2-beta decay. Neutrons can be produced either by natural radioactivity, via spontaneous fission or (alpha,n) reactions, or by interactions initiated by high-energy cosmic rays. In all underground experiments, Monte Carlo simulations of neutron background play a crucial role for the evaluation of the total background rate and for the optimization of rejection strategies. The Monte Carlo methods that are commonly employed to evaluate neutron-induced background and to optimize the experimental setup, are reviewed and discussed. Focus is given to the issue of reliability of Monte Carlo background estimates.
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Dark Matter Induced Neutron Production Search Limits
Using 1440 hours of neutron multiplicity data at 1166 m.w.e., the authors set 90% upper limits on dark matter-nucleus cross sections under the assumption that all dark matter mass energy converts to hadronic energy in a lead target.