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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.

研究了本研究所研制的超冷中子落焦重能仪的特征性能，其能量传递和动量传递的分辨率均达到了10^<-8> eV和10^<-3> A^< 0 -1>的高分辨率。这种极高的分辨率是其他单台中子光谱仪无法达到的，但最近将研制一种新型的自旋回波光谱仪，它采用小角排列方法，也应具有与现有设备相似的性能。跌落聚焦光谱仪可以同时测量不同的散射角，这是传统的到达聚焦重力光谱仪所不能做到的。散射角分析的这一特性对于研究扩散样品的动力学等问题是非常有用的。在此基础上，对比了新型的小角自旋回波光谱仪与我们的光谱仪的特性性能，结果表明，由于样品中超冷中子在散射过程中的中子光学过程，超冷中子重能仪对散射样品的动力学信息有很大的不同。这些从本研究中得到的具有指导意义的结论，将有效地应用于即将对几个正在制备的实际散射样品进行的应用实验。