Angular distribution of γ rays from a neutron-induced p -wave resonance of Xe132

A neutron-energy dependent angular distribution was measured for individual $\ensuremath{\gamma}$ rays from the 3.2 eV $p$-wave resonance of $^{131}\mathrm{Xe}+n$, that shows enhanced parity violation owing to a mixing between $s$- and $p$-wave amplitudes. The $\ensuremath{\gamma}$-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 $\ensuremath{\gamma}$ rays, which correspond to a transition to the 1807 keV excited state of $^{132}\mathrm{Xe}$. 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.