Abstract
Abstract The spin is a very useful probe for the space-time symmetry violation in fundamental interactions. Recent topics in this field are about the large enhancement (106) of the parity (P) violation in the neutron-nucleus interaction in the incident neutron-energy region of eV, where a large neutron-helicity dependence is found in the cross section [1, 2, 3, 4]. The large enhancement is also expected in the symmetry-violation effect under time reversal (T). A T-odd triple-correlation term between the neutron spin, nuclear spin and neutron momentum, which changes in sign under T, is measured in the T-violation test. The neutron spin is also used as a probe in condensed matter science. For example, the magnetic moment of the neutron and the neutron magnetic Bragg-scattering have been widely used for the study of the magnetism in condensed matter. In these studies, the neutron-spin polarization and analysis play a decisive role. 'He nuclear polarization has potentially the most preferable properties as a ...
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