DYNAMICS OF A NEUTRON IN ELECTROMAGNETIC-FIELDS AND QUANTUM PHASE INTERFERENCE

The dynamics of a neutral spinning particle in electromagnetic fields is investigated. The interference with unpolarized neutron beams is re asonably interpreted as the observation of spin precession in electrom agnetic fields which has a dynamical origin. It is shown that only for a particular choice af the initial polarization of the spin the condi tions for the Aharonov-Casher topological phase shift and the scalar A haronov-Bohm effect can be fulfilled. The recent experiment on the Aha ronov-Casher phase shift with neutron interferometry can be considered as a test of a new anyon model, which is a result of spin precession in the local electric field.