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

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission
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一种用于高精度测量偏振 eV 中子传输中奇偶校验破坏的模块化装置

DOI:
10.1016/j.nima.2020.163961
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发表时间:
2020
期刊:
Detectors and Associated Equipment
影响因子:
--
通讯作者:
Dickerson, K.A.
Dickerson, K.A.
中科院分区:
--
文献类型:
--
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.

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我们描述了一种模块化装置,用于在洛斯阿拉莫斯国家实验室小曼努埃尔·卢扬中子散射中心进行具有高瞬时中子通量的超热中子-核共振的宇称破坏测量。该装置旨在对纵向偏振中子通过含有在 0.1-10 eV 能量范围内具有 p 波中子-核共振的核的目标的奇偶校验传输不对称性进行高精度测量,并适应未来对通过偏振核目标的偏振中子传输的时间反转破坏的研究。该装置由可调节中子和伽马准直系统、3 He-4 He 离子室中子通量监测器、两个相同的用于靶冷却的低温恒温器、绝热电子中子自旋翻转器、电流模式下运行的近单位效率 6 Li-7 Li 闪烁探测器、灵活的 CAEN 数据采集系统和基于 3 He 气体自旋交换光泵浦的中子自旋过滤器组成。我们描述了致力于抑制奇偶不对称测量中的系统误差的设备设计的特征。我们描述了用于在 139 La 中的 0.7 eV p 波谐振处进行奇偶校验破坏精确测量的设备配置,该设备采用两个相同的 139 La 目标,一个使用弱相互作用在 p 波谐振上偏振光束,另一个用于分析偏振。
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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