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Parity violating effects enhanced by up to 10 6  times compared to proton-proton scattering have been observed in several neutron capture induced compound nuclei. This enhancement is explained as an interference between an s-wave and a p-wave amplitude (s-p mixing). Theory predicts that this mechanism can also enhance T-violating effects. For estimation of this enhancement in a promising candidate nucleus, we measured the angular distribution of γ-rays in the (n,γ) reaction induced in a  139 La target. Experiments were performed at J-PARC, using a germanium detector array at an intense neutron beam. Analysis of the observed angular dependence around the 0.74 eV p-wave resonance allowed us to determine the ratio of the partial p-wave neutron width to the total neutron width in the entrance channel of the compound nucleus. We also report our development of a  3 He spin filter needed as an epithermal-neutron polarizer for the T-violation search.

Measurement of the angular distribution of γ-rays after neutron capture by 139La for a T-violation search

Measurement of the angular distribution of γ-rays after neutron capture by ¹³⁹La for a T-violation search