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Measurements of the lifetime of neutrons trapped in a bottle have beenconsistently shorter than the lifetime measured in neutron beam experiments.With trapping potentials as low as 50 neV and neutron detectors located only atthe top of the bottle, this discrepancy could be the result of the softscattering of dark matter with neutrons. However, it is challenging to obtainthe observed loss rate in conventional models of dark matter scattering. Weshow that this phenomenology is possible in composite models of dark matterwhere the soft scattering is from dark matter that has been captured andaccumulated in the earth. This solution can be tested by placing more neutrondetectors around the trap, providing better angular coverage. The phenomenologyof soft scattering by trapped composite dark matter is generic and suggests newexperimental directions that could be pursued to detect this large class ofmodels.

A Composite Solution to the Neutron Bottle Anomaly