Measurement of Th-232(n,f) and Th-232(n,gamma) reaction rates in thorium powder cylinder bombarded with D-T neutrons
Measurement of Th-232(n,f) and Th-232(n,gamma) reaction rates in thorium powder cylinder bombarded with D-T neutrons
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D-T中子轰击钍粉筒中Th-232(n,f)和Th-232(n,gamma)反应速率的测量
DOI：
10.1080/00223131.2017.1291373
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发表时间：
2017
影响因子：
1.2
通讯作者：
Liu R
中科院分区：
文献类型：
--
作者：
Zheng Lei;Yang Yiwei;Liu Zhujun;Liu Rong;Jiang Li;Wang Mei;Wen Jie;Liu Zhujun;Wen Jie;Liu R
为了给聚变-裂变混合能堆概念设计中的钍参数评估提供参考，在D-T中子轰击钍粉筒中进行了专门的积分实验。利用激活法和离线伽马射线技术获得了入射D+束0°方向上的钍捕获率和裂变率，实验不确定度为钍捕获率为~ 3.1%，基于裂变产物85mkr、143Ce和87kr的钍裂变率分别为5.5%、8.1%和6.3%。基于85mkr的钍裂变速率与采用ENDF/B-VII的模拟结果吻合较好。0库数据。并对氧化钍粉中氧含量和实验大厅散射中子的影响进行了评价。采用ENDF/B-Ⅶ的MCNP仿真。0、JENDL-4.0库数据除采用ENDF/B-Ⅶ.1外，在不确定度范围内与实验一致（6.0%）和CENDL-3.1(7.9%)，而对于钍捕获率，采用JENDL-4.0的模拟与实验结果吻合最好。采用不同库数据的钍输运介质反应通道对钍反应速率的影响可以忽略不计。中子谱下的钍俘获裂变比表明燃料增殖效率很低，能量产生起主导作用。
In order to provide reference for the evaluation of thorium parameters for the conceptual design of fusion–fission hybrid energy reactor, a dedicated integral experiment was carried out in a thorium powder cylinder bombarded with D-T neutrons. Thorium capture and fission rates in the 0° direction to the incident D+beam were obtained using the activation method followed by the off-line gamma-ray technique, experimental uncertainties were ∼3.1% for thorium capture rate, and were 5.5%, 8.1%, and 6.3% for thorium fission rates based on fission products85mKr,143Ce, and87Kr, respectively. The thorium fission rate based on85mKr agreed well with the simulation employing ENDF/B-VII.0 library data. The influence of the oxygen contained in the thorium oxide powder and the scattering neutrons from the experimental hall was also evaluated. MCNP simulations employing ENDF/B-Ⅶ.0, JENDL-4.0 library data agreed with experiment within uncertainties except that employing ENDF/B-Ⅶ.1 (6.0%) and CENDL-3.1 (7.9%) for thorium fission rate, while for thorium capture rate, simulation employing JENDL-4.0 agreed with experiment best. The influence of reaction channels of thorium transport medium employing different library data on the thorium reaction rates could be neglected according to the simulation. The thorium capture to fission ratio demonstrated that the fuel breeding efficiency is quite low and energy production plays a leading role under the neutron spectra in this experiment.