Angular distribution of γ rays from neutron-induced compound states of la 140

T. Okudaira, S. Takada, K. Hirota, A. Kimura, M. Kitaguchi, J. Koga, K. Nagamoto, T. Nakao, A. Okada, K. Sakai, H. M. Shimizu, T. Yamamoto, T. Yoshioka

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Abstract

The angular distribution of individual γ rays, emitted from a neutron-induced compound-nuclear state via radiative capture reaction of La139(n,γ) has been studied as a function of incident neutron energy in the epithermal region by using germanium detectors. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrals of low- and high-energy region of a neutron resonance respectively, and we found that ALH has the angular dependence of (Acosθγ+B), where θγ is the emitted angle of γ rays, with A=-0.3881±0.0236 and B=-0.0747±0.0105 in 0.74 eV p-wave resonance. This angular distribution was analyzed within the framework of interference between s- and p-wave amplitudes in the entrance channel to the compound-nuclear state, and it is interpreted as the value of the partial p-wave neutron width corresponding to the total angular momentum of the incident neutron combined with the weak matrix element, in the context of the mechanism of enhanced parity-violating effects. Additionally, we use the result to quantify the possible enhancement of the breaking of time-reversal invariance in the vicinity of the p-wave resonance.

Original languageEnglish
Article number034622
JournalPhysical Review C
Volume97
Issue number3
DOIs
Publication statusPublished - Mar 27 2018

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Okudaira, T., Takada, S., Hirota, K., Kimura, A., Kitaguchi, M., Koga, J., Nagamoto, K., Nakao, T., Okada, A., Sakai, K., Shimizu, H. M., Yamamoto, T., & Yoshioka, T. (2018). Angular distribution of γ rays from neutron-induced compound states of la 140. Physical Review C, 97(3), [034622]. https://doi.org/10.1103/PhysRevC.97.034622