DT中子下聚乙烯球中<sup>232</sup>Th (n, 2n)反应率的测量与分析

刘竹君; 羊奕伟; 郑雷; 刘荣; 杨朝文; 王玫

doi:10.11889/j.0253-3219.2018.hjs.41.060502

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DT中子下聚乙烯球中²³²Th (n, 2n)反应率的测量与分析

核物理、交叉学科研究 | 更新时间：2021-05-19

- DT中子下聚乙烯球中²³²Th (n, 2n)反应率的测量与分析
- Measurement and analysis of the ²³²Th(n, 2n) reaction rate in a polyethylene shell with DT neutrons
- 核技术 2018年41卷第6期文章编号：060502
- 作者机构：
  
  1.中国工程物理研究院核物理与化学研究所绵阳 621900
  2.四川大学物理科学与技术学院核工程与核技术系成都 610064
  3.清华大学工程物理系北京 100084
- 作者简介：
  
  [ "刘竹君, 女, 1991年出生, 2015年毕业于四川大学, 现为硕士研究生, 研究领域为核信息获取与处理", "LIU Zhujun, female, born in 1991, graduated from Sichuan University in 2015, master student, focusing on acquisition and processing of nuclear information" ]
  羊奕伟, E-mail:winfield1920@126.com YANG Yiwei, E-mail: winfield1920@126.com
- 基金信息：
  
  国家自然科学基金(11505164);中国工程物理研究院院长基金(YZJJLX2016003);中子重点实验室基金(2015BA02)
- DOI：10.11889/j.0253-3219.2018.hjs.41.060502
  中图分类号： TL99
- 收稿日期：2018-02-05，
  
  修回日期：2018-03-14，
  
  纸质出版日期：2018-06-10
- 稿件说明：
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刘竹君, 羊奕伟, 郑雷, 等. DT中子下聚乙烯球中²³²Th (n, 2n)反应率的测量与分析[J]. 核技术, 2018,41(6):060502

Zhujun LIU, Yiwei YANG, Lei ZHENG, et al. Measurement and analysis of the ²³²Th(n, 2n) reaction rate in a polyethylene shell with DT neutrons[J]. Nuclear techniques, 2018, 41(6): 060502
刘竹君, 羊奕伟, 郑雷, 等. DT中子下聚乙烯球中²³²Th (n, 2n)反应率的测量与分析[J]. 核技术, 2018,41(6):060502 DOI： 10.11889/j.0253-3219.2018.hjs.41.060502.

Zhujun LIU, Yiwei YANG, Lei ZHENG, et al. Measurement and analysis of the ²³²Th(n, 2n) reaction rate in a polyethylene shell with DT neutrons[J]. Nuclear techniques, 2018, 41(6): 060502 DOI： 10.11889/j.0253-3219.2018.hjs.41.060502.

摘要

232

Th（n，2n）数据对于钍基反应堆研究十分重要，有必要针对其开展中子积分实验，因此，建立了聚乙烯球基准宏观装置，利用活化法在DT中子源下开展了测量

232

Th（n，2n）反应率的中子积分实验。实验中分别采用了钍粉末以及钍片两种样品形态，以消除实验样品状态对实验结果的影响，将样品置于与D离子入射方向成0°的位置进行辐照，利用金硅面α探测器进行中子产额监测以及中子注量波动监测。辐照结束后，利用高纯锗谱仪离线测量反应产物

231

Th发射的能量为84.2 keV的γ射线，得到

232

Th（n，2n）反应率值。同时使用MCNP（Monte Carlo N Particle Transport Code）在数据库ENDF/B-.1 Ⅶ、ENDF/B-.0 Ⅶ、JENDL4.0下对实验进行了精确模拟，数据库JENDL4.0下的反应率计算结果与实验符合较好。

Abstract

Background

The

232

Th(n

2n) reaction dominates the neutron generation

so the validity of the cross section data is significant in the thorium based reactor.

Purpose

In order to provide the data reference for the design of thorium based reactor

an integral experiment to measure the

232

Th(n

2n) reaction rate was carried out using the activation method in a polyethylene shell with DT neutrons.

Methods

In the experiment

thorium samples were arranged in the 0° direction to the incident D

beam

and a Au-Si surface barrier detector was used to monitor the neutron yield and the fluctuation of neutron flux.

Results

After irradiation

the 84.2 keV γ ray emitted from

231

Th was measured by HPGe spectrometer

and the

232

Th(n

2n) reaction rate was then obtained. The thorium sample was in foil and powder respectively to eliminate the effect of the sample condition. Simultaneously

the experiment was simulated precisely using Monte Carlo N Particle Transport Code (MCNP) code in the ENDF/B-Ⅶ.1

ENDF/B-Ⅶ.0

and JENDL4.0 libraries.

Conclusion

The calculated values in the JENDL4.0 were in good agreement with the experimental ones

which can provide reference for the design of thorium based reactors.

关键词

Keywords

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DT中子下聚乙烯球中232Th (n, 2n)反应率的测量与分析

Measurement and analysis of the 232Th(n, 2n) reaction rate in a polyethylene shell with DT neutrons

DOI：10.11889/j.0253-3219.2018.hjs.41.060502

摘要

Abstract

关键词

Keywords

references

DT中子下聚乙烯球中²³²Th (n, 2n)反应率的测量与分析

Measurement and analysis of the ²³²Th(n, 2n) reaction rate in a polyethylene shell with DT neutrons