Measurement of the transverse asymmetry of $\gamma$-rays in the ${}^{117}$Sn(n,$\gamma$)${}^{118}$Sn reaction

Abstract

Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity-violation also enhances the breaking of time-reversal-invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual $\gamma$-rays emitted from the compound nuclear state. For a detailed study of the mixing model, a $\gamma$-ray yield in the reaction of ${}^{117}$Sn(n,$\gamma$)${}^{118}$Sn was measured using the pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric $\gamma$-ray yields for the orientation of the neutron polarization was observed.

arXiv comment7 pages, 10 figures

References in corpus (6)

• Development and application of a ${}^3$He Neutron Spin Filter at J-PARC
• Angular Distribution of $\gamma$-rays from Neutron-Induced Compound States of ${}^{140}$La
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Cited by in corpus (2)

• Angular distribution of $\gamma$-rays from a neutron-induced $p$-wave resonance of ${}^{132}$Xe
• Measurements of neutron total and capture cross sections of ${}^{139}$La and evaluation of resonance parameters