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The possibility for our visible world to be a 3-brane embedded in amultidimensional bulk is at the heart of many theoretical edifices inhigh-energy physics. Probing the braneworld hypothesis is thus a majorexperimental challenge. Following recent theoretical works showing that matterswapping between braneworlds can occur, we propose aneutron-shining-through-a-wall experiment. We first show that an intenseneutron source such as a nuclear reactor core can induce a hidden neutron fluxin an adjacent hidden braneworld. We then describe how a low-backgrounddetector can detect neutrons arising from the hidden world and quantify theexpected sensitivity to the swapping probability. As a proof of concept, aconstraint is derived from previous experiments.

Probing the braneworld hypothesis with a neutron-shining-through-a-wall experiment