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In a recent paper submitted to Physical Review Letters, Fornal and Grinsteinhave suggested that the discrepancy between two different methods of neutronlifetime measurements, the beam and bottle methods can be explained by apreviously unobserved dark matter decay mode, n$\rightarrow$ X+$\gamma$ where Xis a dark matter particle. We have performed a search for this decay mode overthe allowed range of energies of the monoenergetic gamma ray for X to be a darkmatter particle. We exclude the possibility of a sufficiently strong branch toexplain the lifetime discrepancy with greater than 4 sigma confidence.

Search for the Neutron Decay n$\rightarrow$ X+$\gamma$ where X is a dark matter particle