High sensitivity of a future search for P-odd/T-odd interactions on the 0.75 eV \(p\)-wave resonance in \(\vec{n}+^{139}\vec{\rm La}\) forward transmission determined using pulsed neutron beam

Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In...

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Veröffentlicht in:arXiv.org 2023-12
Hauptverfasser: Nakabe, R, Auton, C J, Endo, S, Fujioka, H, Gudkov, V, Hirota, K, Ide, I, Ino, T, Ishikado, M, Kambara, W, Kawamura, S, Kimura, A, Kitaguchi, M, Kobayashi, R, Okamura, T, Oku, T, Okudaira, T, Okuizumi, M, Otero Munoz, J G, Parker, J D, Sakai, K, Shima, T, Shimizu, H M, Shinohara, T, Snow, W M, Takada, S, Takahashi, R, Takahashi, S, Tsuchikawa, Y, Yoshioka, T
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Sprache:eng
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Zusammenfassung:Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In these compound processes, the TRIV cross-section is given as the product of the PV cross-section, a spin-factor \(\kappa\), and a ratio of TRIV and PV matrix elements. We determined \(\kappa\) to be \(0.59\pm0.05\) for \(^{139}\)La+\(n\) using both \((n, \gamma)\) spectroscopy and (\(\vec{n}+^{139}\vec{\rm La}\)) transmission. This result quantifies for the first time the high sensitivity of the \(^{139}\)La 0.75~eV \(p\)-wave resonance in a future search for P-odd/T-odd interactions in (\(\vec{n}+^{139}\vec{\rm La}\)) forward transmission.
ISSN:2331-8422