Experimental Comparison of Performances of Ultracold Neutron Gravity Spectrometers

Research Project

Project/Area Number	02044077
Research Category	Grant-in-Aid for international Scientific Research
Allocation Type	Single-year Grants
Section	Joint Research
Research Institution	Kyoto University
Principal Investigator	UTSURO Masahiko Research Reactor Institute, Kyoto University ; Prof., 原子炉実験所, 教授 (50027421)
Co-Investigator(Kenkyū-buntansha)	EBISAWA Toru Research Reactor Institute, Kyoto University ; Assist. Res., 原子炉実験所, 助手 (30027453) KAWABATA Yuji Research Reactor Institute, Kyoto University ; Assist. Res., 原子炉実験所, 助手 (00224840) KANAYA Toshiharu Institute for Chemical Research, Kyoto University ; Ass. Prof., 化学研究所, 助教授 (20152788) KOMURA Shigehiro Department of Arts and Sciences, Hiroshima University ; Prof., 総合科学部, 教授 (50034583) DREXEI Winfried Institut Laue Langevin ; Senior Scientist, ランジュバン研究所(フランス国), 主任研究員 STEYERI Albert Physics Department, the University of Rhode Island ; Prof., 物理学科(アメリカ合衆国), 教授
Project Period (FY)	1990
Project Status	Completed (Fiscal Year 1990)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,900,000) Fiscal Year 1990: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywords	Neutron spectrometer / Neutron scattering experiment / Ultrahigh resolution / Ultracold neutrons / Performance test / Comparisons / High flux reactor
Research Abstract	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