抄録
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.
| 元の言語 | 英語 |
|---|---|
| 記事番号 | 034622 |
| ジャーナル | Physical Review C |
| 巻 | 97 |
| 発行部数 | 3 |
| DOI | |
| 出版物ステータス | 出版済み - 3 27 2018 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
これを引用
Angular distribution of γ rays from neutron-induced compound states of la 140. / 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, Tamaki.
：: Physical Review C, 巻 97, 番号 3, 034622, 27.03.2018.研究成果: ジャーナルへの寄稿 › 記事
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TY - JOUR
T1 - Angular distribution of γ rays from neutron-induced compound states of la 140
AU - Okudaira, T.
AU - Takada, S.
AU - Hirota, K.
AU - Kimura, A.
AU - Kitaguchi, M.
AU - Koga, J.
AU - Nagamoto, K.
AU - Nakao, T.
AU - Okada, A.
AU - Sakai, K.
AU - Shimizu, H. M.
AU - Yamamoto, T.
AU - Yoshioka, Tamaki
PY - 2018/3/27
Y1 - 2018/3/27
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevC.97.034622
DO - 10.1103/PhysRevC.97.034622
M3 - Article
VL - 97
JO - Physical Review C
JF - Physical Review C
SN - 2469-9985
IS - 3
M1 - 034622
ER -