利用脉冲中子束确定0.75 eV p波共振在\\(\vec{n}+^{139}\vec{\rm La}\\)前向透射中对P奇/T奇相互作用未来搜寻的高灵敏度
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
AI总结:
本文通过脉冲中子束实验测定\\(^{139}\\)La+\\(n\\)的自旋因子\\(κ=0.59\pm0.05\\),首次量化了0.75 eV p波共振在未来前向透射中搜寻P奇/T奇相互作用的高灵敏度。
摘要:
中子透射实验可以通过与中子诱发的复合核过程中观测到的大宇称破坏(PV)效应相同的增强机制,为核子-核子相互作用中的时间反演不变性破坏(TRIV)效应提供一种新型的高灵敏度搜寻手段。在这些复合过程中,TRIV截面表示为PV截面、自旋因子\\(κ\\)以及TRIV与PV矩阵元之比的乘积。我们利用\\((n, γ)\\)谱学和\\((\vec{n}+^{139}\vec{\rm La})\\)透射两种方法,确定了\\(^{139}\\)La+\\(n\\)的\\(κ\\)值为\\(0.59\pm0.05\\)。这一结果首次量化了\\(^{139}\\)La 0.75 eV p波共振在未来\\((\vec{n}+^{139}\vec{\rm La})\\)前向透射中搜寻P奇/T奇相互作用时的高灵敏度。
英文摘要:
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 $κ$, and a ratio of TRIV and PV matrix elements. We determined $κ$ to be $0.59\pm0.05$ for $^{139}$La+$n$ using both $(n, γ)$ 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.
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