Study of resonance spin flipping of neutrons on magnetic cluster oscillators

摘要

Polarized neutron transmission T(+-) studies have been performed in applied external magnetic fields versus neutron wavelength on a Li-Ti-Zn ferrite system exhibiting a magneto-crystalline cluster structure. Distinct maxima for transmission T(-), measured at the negative polarization P(sup -), were observed and interpreted as due to the resonance spin flipping of neutrons. This resonance spin flipping has been noticed for the first time on a dynamical magnetic cluster system in which the external magnetic field produce a rotating magnetic induction (sub perpendicular), perpendicular to the constant guide magnetic induction (sub parallel). Polarized neutrons passing through this system interact with a rotating magnetic induction (sub perpendicular)(t) connected with the correlated interaction of cluster oscillators. Based on the observed resonance maxima of neutron transmission T(-), the perpendicular (sub perpendicular) and parallel magnetic induction (sub parallel), as well as the length of periodicity of (sub perpendicular) component 'seen' by neutron have been determined. The values of (sub perpendicular) and (sub parallel) are in good agreement with those obtained previously by us in neutron depolarization experiments. Moreover, the magnetic 'cluster waves', induced by external magnetic field have been observed. It has been found that the generated 'cluster waves' in a coupled cluster system propagate with the velocity of v(sub f)approx. 344 m/s. The mean gyromagnetic ratio gamma(sub c) approx. -218,000 rad/s mT or gamma(sub c) of magnetic cluster was also determined as gamma(sub c) approx. -218,000, approx. -34,700 Hz/mT. (author). 17 refs, 8 figs, 3 tabs. (Atomindex citation 28:022813)