Experimental Comparison of Performances of Ultracold Neutron Gravity Spectrometers

本研究的目的是对两台超冷中子重力谱仪的性能进行实验比较，一台是劳厄朗之万研究所的中子到达聚焦原理的超冷中子重力谱仪，另一种是本申请人的小组利用散射中子的下落聚焦原理开发的改进型。作为本国际合作的第一步，为了进行实验对比，主持人访问了罗得岛大学，与发明并完成了NESSIE的Albert Steyerl教授进行了讨论，得到了关于超冷中子重力谱仪的超高能量分辨率、中子的聚焦特性以及散射样品的几个条件等方面的有益启示。我们之间也达成了协议，我们的性能比较实验应该进行。 ...更多信息 D在劳厄·朗之万研究所的超冷中子装置上进行了研究。接下来，T.惠比泽访问了劳厄·朗之万研究所，并与W.德雷克塞尔，这些超冷中子设备的负责人。通过这些研究，特别是关于散射样品和重力谱仪实验条件的研究，得出了几个重要的结论和注意事项。川端康成还访问了劳厄朗之万研究所和我们的新重力光谱仪的实验地点，由德雷克塞尔博士命名为SUPERNESSIE，进行性能测试和演示。目前所使用的重力衍射仪正处于实验研究的最后阶段，因此根据我们的研究计划，它将在不久的将来被替换到我们的超验仪器中。少

The purpose of the present research is to carry out the experimental comparison of the performances of two ultracold neutron gravity spectrometers, one is now working at the Institut Laue Langevin with the principle of reach focusing of neutrons, and the other is the improved version developed by the group of the present applicant with the principle of the fall focusing of scattered neutrons.As the first step of the present international collaboration for the experimental comparison, the head investigator visited the University of Rhode Island to discuss with Prof. Albert Steyerl who invented and completed the reach focusing gravity spectrometer named NESSIE, and obtained much instructive indications concerning the very high energy resolution, focusing properties of neutrons and several conditions on the scattering samples for the gravity spectrometers of ultracold neutrons. The agreement among us was also derived that our experiment for the comparisons of performances should bec arrie … More d out at the ultracold neutron facility of the Institut Laue Langevin.In the next place, further details of the working conditions of NESSIE were investigated by Mr. T. Ebisawa who visited the Institut Laue Langevin and discussed actively with Dr. W. Drexel, the responsible staff on these ultracold neutron facilities. Several important conclusions and precautions werederived through these investigations concerning especially the scattering sample and related conditions for the experiment using the gravity spectrometer.Further, some preliminary preparations were progressed by Dr. Y. Kawabata who also visited the Institut Laue Langevin and the experimental location for our new gravity spectrometer, named SUPERNESSIE by Dr. Drexel, to carry out performance tests and demonstrations was assigned. The gravity diffractometer which occupying now the location assigned is in the course of the final stage of the experimental research and therefore it will be replaced to our supernessie in near future according to our research program. Less