학술논문
Spin dependence in the $p$-wave resonance of ${^{139}\vec{\rm{La}}+\vec{n}}$
Document Type
Working Paper
Author
Okudaira, T.; Nakabe, R.; Endo, S.; Fujioka, H.; Gudkov, V.; Ide, I.; Ino, T.; Ishikado, M.; Kambara, W.; Kawamura, S.; Kobayashi, R.; Kitaguchi, M.; Okamura, T.; Oku, T.; Munoz, J. G. Otero; Parker, J. D.; Sakai, K.; Shima, T.; Shimizu, H. M.; Shinohara, T.; Snow, W. M.; Takada, S.; Tsuchikawa, Y.; Takahashi, R.; Takahashi, S.; Yoshikawa, H.; Yoshioka, T.
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Subject
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Abstract
We measured the spin dependence in a neutron-induced $p$-wave resonance by using a polarized epithermal neutron beam and a polarized nuclear target. Our study focuses on the 0.75~eV $p$-wave resonance state of $^{139}$La+$n$, where largely enhanced parity violation has been observed. We determined the partial neutron width of the $p$-wave resonance by measuring the spin dependence of the neutron absorption cross section between polarized $^{139}\rm{La}$ and polarized neutrons. Our findings serve as a foundation for the quantitative study of the enhancement effect of the discrete symmetry violations caused by mixing between partial amplitudes in the compound nuclei.