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Experimental comparison of performances of ultracold neutron gravity spectrometers

超冷中子重力谱仪性能实验比较

基本信息

批准号：
03044079
负责人：
UTSURO Masahiko
金额：
$ 1.92万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044079/
关键词：
Very high resolutions Scattering angle analyses Dynamical structure Neutron optical effects Spin echo spectrometer Small angle arrangement

项目摘要

The characteristic performances of the fall focusing gravity spectrometer with ultracold neutrons developed in our Institute were investigated to be the high resolutions for both of the energy transfer and of the momentum transfer, about 10^<-8> eV and about 10^<-3> A^<o-1>, respectively. These very high resolutions are not attained with any other single machine of neutron spectrometers, but recently a new type of spin echo spectrometer is going to be developed applied with the method of small angle arrangements which should also show similar performances with the present device.Our fall focusing spectrometer gives the possibility of measurements of various scattering angles simultaneously, which was not possible with the conventional reach focusing gravity spectrometer. This property of scattering angle analyses is very much useful for studying, for example, dynamics of diffusing samples. In the next place, the Characteristic performances of our spectrometer compared to the new type of the small angle spin echo spectrometer were studied in the present investigation and the result was indicated that the gravity spectrometer with ultracold neutrons should give much different dynamical information on the scattering sample due to the neutron optical processes of ultracold neutrons in the scattering processes in the sample.These much instructive indications derived as the results of the present studies would be effectively applied in the coming applied experiments for several actual scattering samples now under preparation.

对我所研制的超冷中子落下聚焦重力谱仪的特性性能进行了考察，能量传递和动量传递分辨率分别为10^<-8> eV左右和10^<-3> A^<o-1>左右。这些非常高的分辨率是任何其他单机中子能谱仪都无法达到的，但最近将开发一种新型的自旋回波能谱仪，采用小角度布置的方法，它也应该表现出与现有装置类似的性能。我们的落下聚焦能谱仪提供了同时测量各种散射角的可能性，这是传统的远距离聚焦重力能谱仪无法实现的。散射角分析的这种特性对于研究扩散样品的动力学等非常有用。其次，本研究对我们的谱仪与新型小角自旋回波谱仪的特性性能进行了比较，结果表明，由于超冷中子在样品中散射过程中的中子光学过程，超冷中子重力谱仪应该给出与样品散射有很大不同的动力学信息。这些具有指导意义的指示将有效地应用于样品中。应用于即将进行的几个实际散射样品的应用实验，目前正在准备中。