一种用于极化eV中子传输中宇称破坏的高精度测量的模块化装置。
A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission`
摘要：
本文描述了一种用于在小曼努埃尔·卢汉实验室进行高瞬时中子通量超热中子-核共振宇称破缺测量的模块化装置。洛斯阿拉莫斯国家实验室中子散射中心。该装置的目的是进行高精度测量的宇称奇传输不对称性的纵向极化中子通过目标含有核与p-波中子-核共振在0.1-10 eV的能量制度，并容纳未来的搜索时间反演违反极化中子传输通过极化核目标。该装置由可调中子和伽马准直系统、\(^3\) He- $^{4}$ He离子室中子通量监测器、用于靶冷却的两个相同的低温恒温器、绝热eV中子自旋翻转器、在电流模式下操作的近单位效率\(^6\) Li- \(^{7}\) Li闪烁探测器、柔性CAEN数据采集系统、以及基于$^{3}$ He气体的自旋交换光泵浦的中子自旋过滤器。我们描述的特点，致力于抑制系统误差奇偶不对称测量的设备设计。我们描述的配置的设备用于进行精确测量的奇偶性违反在0.7 eV的p波共振在$^{139}$ La，它采用两个相同的$^{139}$ La目标，一个使用弱相互作用和一个分析的偏振的p波共振的光束。
英文摘要：
We describe a modular apparatus for use in parity-violation measurements in epithermal neutron-nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr.\ Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron-nucleus resonances in the 0.1-10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a \(^3\)He-$^{4}$He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency \(^6\)Li-\(^{7}\)Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of $^{3}$He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in $^{139}$La which employs two identical $^{139}$La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.
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