A neutron-energy dependent angular distribution was measured for individual γ-rays from the 3.2 eV p-wave resonance of 131Xe+n, that shows enhanced parity violation owing to a mixing between s- and p-wave amplitudes. The γ-ray transitions from the p-wave resonance were identified, and the angular distribution with respect to the neutron momentum was evaluated as a function of the neutron energy for 7132 keV γ-rays, which correspond to a transition to the 1807 keV excited state of 132Xe. The angular distribution is considered to originate from the interference between s- and p-wave amplitudes, and will provide a basis for a quantitative understanding of the enhancement mechanism of the fundamental parity violation in compound nuclei.
@article{arxiv.2212.10889,
title = {Angular distribution of $\gamma$-rays from a neutron-induced $p$-wave resonance of $^{132}$Xe},
author = {T. Okudaira and Y. Tani and S. Endo and J. Doskow and H. Fujioka and K. Hirota and K. Kameda and A. Kimura and M. Kitaguchi and M. Luxnat and K. Sakai and D. Schaper and T. Shima and H. M. Shimizu and W. M. Snow and S. Takada and T. Yamamoto and H. Yoshikawa and T. Yoshioka},
journal= {arXiv preprint arXiv:2212.10889},
year = {2023}
}