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27 April 2024

» arxiv » 2212.10889

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Angular distribution of $γ$-rays from a neutron-induced $p$-wave resonance of $^{132}$Xe
T. Okudaira ; Y. Tani ; S. Endo ; J. Doskow ; H. Fujioka ; K. Hirota ; K. Kameda ; A. Kimura ; M. Kitaguchi ; M. Luxnat ; K. Sakai ; D. Schaper ; T. Shima ; H. M. Shimizu ; W. M. Snow ; S. Takada ; T. Yamamoto ; H. Yoshikawa ; T. Yoshioka ;
Date:	21 Dec 2022
Abstract:	A neutron-energy dependent angular distribution was measured for individual $gamma$-rays from the 3.2 eV $p$-wave resonance of $^{131}$Xe+$n$, that shows enhanced parity violation owing to a mixing between $s$- and $p$-wave amplitudes. The $gamma$-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 $gamma$-rays, which correspond to a transition to the 1807 keV excited state of $^{132}$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.
Source:	arXiv, 2212.10889
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