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STUDY ON NEUTRON CAPTURE REACTION BY IMPORTANT FISSION PRODUCTS WITH A HIGHLY SENSITIVE DETECTOR

用高灵敏探测器研究重要裂变产物的中子俘获反应

基本信息

批准号：
09680475
负责人：
IGASHIRA Masayuki
金额：
$ 1.66万
依托单位：
Tokyo Institute of Technology
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 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680475/
关键词：
FISSION PRODUCTS NEUTRON CAPTURE REACTION keV NERTRONS CROSS SECTIONS GAMMA-RAY SPECTRA KeV中性子

项目摘要

The accurate neutron capture reaction cross sections of important fission products are indispensable for the development of an innovative nuclear reactor which aims at high burn-up or at the incineration of transuranic elements. The purposes of the present study were (1) the measurements of capture cross sections and capture gamma-ray spectra of Nd-144, 146, Eu-151, and Dy-164 in the neutron energy region of 10 to 800 keV with a highly sensitive detector, (2) the theoretical analysis of the present experimental results, (3) the comparison of the present results with those for Sm-147, 148, 149, 150, 152, 154, Nd-143, 145, and Dy-161, 162, 163, and (4) the investigation of the mechanism of neutron capture reaction by important fission products.All measurements were made with the 3UH-HC Pelletron accelerator, the highly sensitive detector, and the data acquisition system of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. Highly enriched samples were employed in the measurements. The measurements were performed for Nd-146, Eu-151, and Dy-164 as scheduled, but the measurement for Nd-144 was not performed because of a shortage of funds. The measurements for Er-166, 167 were, however, additionally performed. As a result, the capture cross sections of those five isotopes were derived with the errors of about 5% in the neutron energy region of 10 to 600 keV. The capture gamma-ray spectra of those isotopes were also derived with good accuracy. The theoretical analysis was performed for the experimental results of those isotopes, Sm-147, 148, 149, 150, 152, 154, Nd-143, 145, Eu-153, and Dy-161, 162, 163. The results of the present study have been already published.

重要裂变产物的准确中子俘获反应截面对于发展以高燃耗或焚烧超铀元素为目标的新型核反应堆是必不可少的。本工作的目的是：（1）用高灵敏度探测器测量10 - 800 keV中子能区Nd-144，146，Eu-151和Dy-164的俘获截面和俘获γ能谱，（2）对实验结果进行理论分析，（3）将实验结果与Sm-147的结果进行比较，148，149，150，152，154，Nd-143，145，Dy-161，162，163，以及（4）重要裂变产物俘获中子反应机理的研究。以及东京工业大学核反应堆研究实验室的数据采集系统。在测量中采用了高度富集的样品。Nd-146、Eu-151和Dy-164的测定按计划进行，但Nd-144的测定因资金不足而未进行。然而，额外进行了Er-166、167的测量。在10 ~ 600 keV中子能量范围内，计算了这五种同位素的俘获截面，误差约为5%。这些同位素的俘获γ射线谱也得到了良好的精度。对Sm-147、148、149、150、152、154，Nd-143、145，Eu-153，Dy-161、162、163的实验结果进行了理论分析。本研究的结果已经发表。