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The possibility that a neutron can be transformed to a hidden sector particleremains intriguingly open. Proposed theoretical models conjecture that thehidden sector can be represented by a mirror sector, and the neutron n canoscillate into its sterile mirror twin n', exactly or nearly degenerate in masswith n. Oscillations n - n' can take place in vacuum and in the environment ofthe regular matter and the magnetic field where only neutron will be subject ofinteraction with the environment. We describe the propagation of theoscillating n - n' system as a particle of the cold neutron beam passingthrough the dense absorbing materials in connection with the possibleregeneration type of experiments where the effect of n -> n' -> ntransformation can be observed.

Neutron-Mirror Neutron oscillations in Matter