STUDY ON NEUTRON REACTION CROSS SECTIONS OF IMPORTANT FISSION PRODUCTS

重要裂变产物中子反应截面的研究

基本信息

批准号：
07680525
负责人：
IGASHIRA Masayuki
金额：
$ 1.41万
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：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680525/
关键词：
Fission Product Neutron Reaction Cross Section Neutron Capture Reaction Neutron Inelastic Scattering Reaction

项目摘要

Accurate neutron reaction cross sections of important fission products are needed to develop an innovative nuclear reactor which aims at very high burn-up of fuel or incineration of transuranic elements. The purposes of the present study are to accurately measure capture cross sections, capture gamma-ray spectra, and inelastic scattering cross sections of Nd-143,145 and Sm-147,150 in an incident neutron energy region of 10 to 800 keV,to theoretically analyze the mesured results, to investigate not only the present results but also the current results of Ce-140, Pr-141, Sm-148,149,152,154, and Dy-161,162,163, and to elucidate the mechanisms of neutron capture and inelastic scattering by important fission products.The results of the present study are summarized as follows :1. The capture cross sections, capture gamma-ray spectra, and inelastic scattering cross sections of Nd-143,145 and Sm-147,150 were measured with the error of about 5% in an incident neutron energy region of 10 to 800 keV.2. It was found that a statistical model calculation could reproduce the measured capture cross sections and capture gamma-ray spectra of the four nuclides.3. It was found that the inelastic scattering cross sections of the four nuclides could be reproduced by a statistical model calculation plus a direct model calculation with a distorted-wave Born approximation.4. It is the next problem to elucidate the mechanisms of neutron capture and inelastic scattering by important fission products after investigating not only the experimental and theoretical results of the four nuclides but also the current results of other nuclides.

开发创新型核反应堆需要重要裂变产物的准确中子反应截面，该反应堆旨在实现燃料的高燃耗或超铀元素的焚烧。本研究的目的是准确测量Nd-143,145和Sm-147,150在10~800 keV入射中子能量范围内的俘获截面、俘获伽马能谱和非弹性散射截面,并对测量结果进行理论分析。结果，不仅研究当前结果，还研究 Ce-140、Pr-141、 Sm-148,149,152,154和Dy-161,162,163，阐明重要裂变产物的中子俘获和非弹性散射机制。本研究结果总结如下： 1．在10至800 keV的入射中子能量范围内，测量了Nd-143,145和Sm-147,150的俘获截面、俘获伽马射线能谱和非弹性散射截面，误差约为5%。2。结果发现，统计模型计算可以再现测量的捕获截面并捕获四种核素的伽马能谱。 3．结果发现，四种核素的非弹性散射截面可以通过统计模型计算加上畸变波玻恩近似的直接模型计算来再现。4．在研究了四种核素的实验和理论结果以及其他核素的当前结果之后，下一个问题是阐明重要裂变产物的中子俘获和非弹性散射机制。