Abstract
Neutron background for the high‐sensitivity underground particle astrophysics experiments, such as dark matter searches, double‐beta decay detectors, low‐energy neutrino physics and astrophysics, is discussed. Neutron production via spontaneous fission and (α,n) reactions from U and Th, and by cosmic‐ray muons is considered. We describe the method of calculating neutron spectra from radioactivity and effects produced in the detectors. The requirements for passive neutron shielding are given and the efficiency of an active veto system is discussed. It is shown that muon‐induced neutrons require complex and accurate simulations where any simplification may lead to a significant error in the result.
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