Very precise detection of spin fluctuation by polarized neutrons

采用偏振中子导的新概念，为国家高能物理研究所增强型同步加速器利用设施的TOP光谱仪设计了一个中子偏振器。PNG由直镍导管和铁/硅超镜偏振器组成，它们在中子导管内呈v形。在TOP光谱仪上对其性能进行了研究。结果表明，与以往的Co/Ti Soller极化导相比，PNG能很好地处理脉冲冷中子，提供的极化中子量是极化中子的两倍，且极化效果更好。JAERI东海基地jsr - 3m中6G TOPAN光谱仪极化分析选项的制备工作已经完成，现已投入使用。然而，我们仍在继续尝试通过对极化单色仪和分析仪的Heusler晶体进行热处理，得到偏振性更好的极化中子。

A neutron polarizer has been designed for the TOP spectrometer at Booster Synchrotron Utilization Facility at National institute of High Energy Physics by a new concept of polarizing neutron guide (PNG). The PNG consists of straight Ni guide tubes and Fe/Si supermirror polarizers which make V-shape in the neutron guide. Its performance has been studied on the TOP spectrometer. It is revealed that PNG works very well with pulsed cold neutrons and that it provides twice as much as polarized neutron with better polarization compared with the previous polarizer of Co/Ti Soller polarizing guide.Preparation of polarization analysis option on TOPAN spectrometer at 6G in JRR-3M at the Tokai establishment of JAERI has been completed and now ready for use. However, we still continue to try to get polarized neutrons with better polarization by heat treatment of Heusler crystals of polarizing monochorometer and analyzer.