Angular distribution of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math> rays from a neutron-induced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-wave resonance of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Xe</mml:mi><mml:mprescripts/><mml:none/><mml:mn>132</mml:mn></mml:mmultiscripts></mml:math>
Takuya Okudaira, Y. Tani, Shunsuke Endo, Jak Doskow, Hiroyuki Fujioka, K. Hirota, K. Kameda, A. Kimura, Masaaki Kitaguchi, M. Luxnat, K. Sakai, Danielle Schaper, Tatsushi Shima, Hirohiko M. Shimizu, W. M. Snow, S. Takada, Tomoki Yamamoto, H. Yoshikawa, T. Yoshioka
Abstract
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.