تقرير
Angular Distribution of $\gamma$-rays from Neutron-Induced Compound States of $^{140}$La
| العنوان: | Angular Distribution of $\gamma$-rays from Neutron-Induced Compound States of $^{140}$La |
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| المؤلفون: | 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. |
| المصدر: | Phys. Rev. C 97, 034622 (2018) |
| سنة النشر: | 2017 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | Angular distribution of individual $\gamma$-rays, emitted from a neutron-induced compound nuclear state via radiative capture reaction of ${}^{139}$La(n,$\gamma$) has been studied as a function of incident neutron energy in the epithermal region by using germanium detectors. An asymmetry $A_{\mathrm{LH}}$ was defined as $(N_{\mathrm L}-N_{\mathrm H})/(N_{\mathrm L}+N_{\mathrm H})$, where $N_{\mathrm L}$ and $N_{\mathrm H}$ are integrals of low and high energy region of a neutron resonance respectively, and we found that $A_{\mathrm{LH}}$ has the angular dependence of $(A\cos\theta_\gamma+B)$, where $\theta_\gamma$ is emitted angle of $\gamma$-rays, with $A= -0.3881\pm0.0236$ and $B=-0.0747\pm0.0105$ 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 used the result to quantify the possible enhancement of the breaking of the time-reversal invariance in the vicinity of the p-wave resonance. Comment: 14pages, 25 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.97.034622 |
| URL الوصول: | http://arxiv.org/abs/1710.03065 |
| رقم الأكسشن: | edsarx.1710.03065 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.97.034622 |
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