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Different extensions of the standard model of particle physics, such asbraneworld or mirror matter models, predict the existence of a neutron sterilestate, possibly as a dark matter candidate. This Letter reports a newexperimental constraint on the probability $p$ for neutron conversion into ahidden neutron, set by the STEREO experiment at the high flux reactor of theInstitut Laue-Langevin. The limit is $p<3.1\times 10^{-11}$ at $95 \%$ C.L.improving the previous limit by a factor 13. This result demonstrates thatshort-baseline neutrino experiments can be used as competitivepassing-through-walls neutron experiments to search for hidden neutrons.

Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment