On the Neutron Transition Magnetic Moment

We discuss the possibility of the transition magnetic moments (TMM) between the neutron n and its hypothetical sterile twin mirror neutron n ' from a parallel particle mirror sector. The neutron can be spontaneously converted into mirror neutron via the TMM (in addition to the more conventional transformation channel due to n-n ' mass mixing) interacting with the magnetic field B as well as with mirror magnetic field B '. We derive analytic formulae for the average probability of n-n ' conversion and consider possible experimental manifestations of neutron TMM effects. In particular, we discuss the potential role of these effects in the neutron lifetime measurement experiments leading to new, testable predictions.