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Emission Mossbauer Spectroscopy of ^<237>Np Probe in Uranium Compounds.

铀化合物中^ 237 Np探针的发射穆斯堡尔光谱。

基本信息

批准号：
09650060
负责人：
ONODERA Hideya
金额：
$ 2.11万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650060/
关键词：
Mossbauer spectroscopy Neptunium Uranium compounds Strong-correlation system 強相関電子系物質

项目摘要

This research project was started in order to investigate the physical properties of uranium compounds with strong-correlated electrons by emission ^<237>Np Mossbauer spectroscopy on the basis of new idea that parent ^<237>U nuclei as probes are introduced in U compounds through ^<238>U(gamma, n) reaction. It is also a purpose to establish the emission ^<237>Np Mossbauer spectroscopy to be general and powerful tool for material researches of actinide compounds and alloys. Therefore, the more specific purpose of this work is to develop and construct a spectrometer with sufficient ability for the emission ^<237>Np Mossbauer spectroscopy. The results are summarized as follows.1. A liquid-helium cryostat for the emission ^<237>Np Mossbauer spectroscopy was constructed. In the cryostat, a standard ^<237>NpO_2 absorber is maintained at a constant temperature of 78 K.A sample Mossbauer source put on a long stem whose temperature is controlled between 1.5 K and room temperature can be driven by a precise velocity wave form of *100 mm/sec.2. In the geometry mentioned above, the condition for precise drive of source is surveyed using a absolute velocity calibrator using a laser interferometer which is put in the system in order to observe regularly the precise velocity.3. From the view point of precise drive and velocity calibration, it was confirmed repeatedly that the whole system satisfies the ability demanded for the emission ^<237>Np Mossbauer spectroscopy through measurements of the popular ^<57>Fe Mossbauer effects and the time spectra of interference fringes. Consequently, the whole spectrometer system with sufficient ability for the emission ^<237>Np Mossbauer spectroscopy was completed by the present research project.

本研究项目是基于通过^ U（γ，n）反应将母体^ U核作为探针引入到铀化合物中的新思想，利用发射^ Np穆斯堡尔谱研究具有强关联电子的铀化合物的物理性质而启动<237><237><238>的。同时也是为了使发射<237>穆斯堡尔谱成为锕系化合物和合金材料研究的通用和强有力的工具。因此，本工作的更具体的目的是开发和构建具有足够发射^<237>Np穆斯堡尔谱能力的谱仪。研究结果如下：1.研制了一台用于发射穆斯堡尔谱的液氦低温恒温器<237>。在低温恒温器中，标准的<237>NPO_2吸收体保持在78 K的恒温下，样品穆斯堡尔源放置在温度控制在1.5 K至室温的长杆上，可以用 *100 mm/sec的精确速度波形驱动。在上述几何条件下，利用绝对速度校准器测量源的精确驱动条件，该校准器使用激光干涉仪，该激光干涉仪被放置在系统中以定期观察精确的速度.从精确驱动和速度标定的角度出发，<237>通过对常用的~ 1Fe<57>穆斯堡尔效应和干涉条纹时间谱的测量，反复验证了整个系统满足发射~ 1 Np穆斯堡尔谱的能力要求。因此，本研究项目完成了一套具有足够能力的发射~（40<237>）Np穆斯堡尔谱仪系统。