The Stern-Gerlach interaction between a traveling particle and a time varying magnetic field

Dipartimento di Fisica dell’Universita di Padova and`INFN Sezione di Padova, Via Marzolo 8, 35131 Padova, ItalyAbstractThe general expression of the Stern-Gerlach force is deduced for a chargedparticle, endowed with a magnetic moment, which travels inside a time vary-ing magnetic field. Then, the energy integral of the Stern-Gerlach force isevaluated in the case of a particle crossing a TE rf cavity with its magneticmoment oriented in different ways with respect as the cavity axis. We shalldemonstrate that appropriate choices of the cavity characteristics and of thespin orientation confirm the possibility of separating in en ergy the oppositespin states of a fermion beam circulating in a storage ring and, in addition,make feasible an absolute polarimeter provide that a parametric converteracting between two coupled cavities is implemented.Report no.: INFN/TC-00/03, March, 22, 2000PACS: 29.27.Hj; 03.65