论文标题

用于在极化EV中子传播中用于高精度测量的模块化设备

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission`

论文作者

Schaper, D. C., Auton, C., Barrón-Palos, L., Borrego, M., Chavez, A., Cole, L., Crawford, C. B., Curole, J., Dhahri, H., Dickerson, K. A., Doskow, J., Fox, W., Gervais, M. H., Goodson, B. M., Knickerbocker, K., Jiang, C., King, P. M., Lu, H., Mocko, M., Olivera-Velarde, D., Munoz, J. G. Otero, Penttilä, S. I., Pérez-Martín, A., Snow, W. M., Steffen, K., Vanderwerp, J., Visser, G.

论文摘要

我们描述了一种模块化设备,用于在洛斯阿拉莫斯国家实验室的Manuel Lujan Jr。该设备旨在通过在0.1-10 eV能量状态下含有核核的靶标,对纵向极化的中子的平均值传播不对称进行高精度测量,并通过极化核目标在极性核目标中搜索时间反向紫罗兰。该设备由可调节的中子和伽马准确系统组成,A \(^3 \)He-$^{4} $ he ion submer中子通量监测器,两个用于靶向冷却的低温恒温器,一种绝热的EV-内部旋转flaipper,一种近乎单位的效率,一种近(^6 \)li-(^6 \)li- \(^6 \)li- \(^6 \)fertrantive crestion crestiation,灵活的CAEN数据采集系统,以及基于$^{3} $ HE气体的自旋交换光学泵的中子自旋滤波器。我们描述了用于抑制奇偶校验不对称测量中系统误差的设备设计的特征。我们描述了用于在$^{139} $ la中以0.7 eV p-波及共振进行精确测量的设备的配置,该设备采用了两个相同的$^{139} $ la目标,一种使用弱的互动和一个分析偏振化的相同的$^{139} $ la目标,可在P波波之间进行偏振。

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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