用于 CSNS Back-n 束流中对称性违规研究的 eV 中子极化技术开发与应用
仪器与探测器
2026-02-23 v1 高能物理 - 实验
核实验
摘要
中子-核子共振中对称性破坏效应的动态增强提供了对 Time-Reversal Invariance Violation (TRIV) 的灵敏测试场域。利用这一机制，Neutron Optics Parity and Time Reversal Experiment (NOPTREX) 旨在阐明宇宙剩余质量不对称性的起源。关键在于精确测量 Parity Violation (PV) 偏斜，这对于校准未来 TRIV 实验所必需的核参数至关重要。为支持此类研究，我们在中国中子源 (CSNS) 的 Back-n 白中子束流中开发了 eV 极化中子。通过现场 Spin-Exchange Optical Pumping (SEOP) He 滤波器产生中子极化。通过绝热旋回器进行自旋操控，通过具备螺线场的真空输送系统保持中子极化。实验成功测得 La 0.747 eV p 轨道共振处的偏斜为约 (统计) (系统) %。这些结果与该共振的先前结果一致，验证了该系统进行 PV 测量的能力。
引用
@article{arxiv.2602.17742,
title = {Development and Application of an eV Neutron Polarization for Parity Violation Studies at CSNS Back-n Beamline},
author = {Xu Qin and Tianhao Wang and Xuanbo Chen and Changdong Deng and Yongce Gong and Zenghang Huang and Wei Jiang and Zhengquan Liu and Guangyuan Luan and Haotian Luo and Qiuyue Luo and Yongjia Lv and You Lv and Nikolaos Vassilopoulos and Xichao Ruan and William Michael Snow and Kang Sun and Sepehr Samiei and Jian Tang and Shilin Wang and Hongyi Wu and Xiaomin Xiong and Xinyu Yuan and Junpei Zhang and Mofan Zhang and Qiwei Zhang and Qingbo Zheng and Ruirui Fan and Xin Tong},
journal= {arXiv preprint arXiv:2602.17742},
year = {2026}
}