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中子在大气中产生氮俘获γ的蒙特卡罗模拟研究

刘利 左应红 牛胜利 朱金辉 李夏至

刘利, 左应红, 牛胜利, 等. 中子在大气中产生氮俘获γ的蒙特卡罗模拟研究[J]. 强激光与粒子束, 2022, 34: 086002. doi: 10.11884/HPLPB202234.220055
引用本文: 刘利, 左应红, 牛胜利, 等. 中子在大气中产生氮俘获γ的蒙特卡罗模拟研究[J]. 强激光与粒子束, 2022, 34: 086002. doi: 10.11884/HPLPB202234.220055
Liu Li, Zuo Yinghong, Niu Shengli, et al. Monte Carlo simulation of neutron capture γ-rays from nitrogen in the atmosphere[J]. High Power Laser and Particle Beams, 2022, 34: 086002. doi: 10.11884/HPLPB202234.220055
Citation: Liu Li, Zuo Yinghong, Niu Shengli, et al. Monte Carlo simulation of neutron capture γ-rays from nitrogen in the atmosphere[J]. High Power Laser and Particle Beams, 2022, 34: 086002. doi: 10.11884/HPLPB202234.220055

中子在大气中产生氮俘获γ的蒙特卡罗模拟研究

doi: 10.11884/HPLPB202234.220055
基金项目: 强脉冲辐射环境模拟与效应国家重点实验室专项经费项目(SKLIPR.1504)
详细信息
    作者简介:

    刘利:刘 利,liuli@nint.ac.cn

  • 中图分类号: TL99

Monte Carlo simulation of neutron capture γ-rays from nitrogen in the atmosphere

  • 摘要: 为了精确计算早期核辐射,建立了中子及次级γ在大气中输运的蒙特卡罗计算模型,并利用几何分裂算法与时间分裂算法等减方差技巧提高计算效率,计算得到了距源点不同距离球面上中子与中子次级γ的信息,给出了不同位置不同时间的氮俘获γ能量释放率。开展了氮俘获γ能量释放率的规律性研究,并分析了中子能量对氮俘获γ的影响。结果表明,氮俘获γ能量释放率先随源点的距离增加而增大,在距源点约500 m达到峰值,而后随距离增加指数衰减。氮俘获γ能量释放率在时间上服从指数衰减规律,衰减时间在0.1 s左右。引入表征氮俘获γ辐射强度参数a和特征衰减时间参数$ \tau $,拟合得到了不同距离不同时间氮俘获γ能量释放率的快速计算公式。研究表明,氮俘获γ辐射强度、衰减时间及其空间分布均与中子能量密切相关。
  • 图  1  中子与14N的核反应截面

    Figure  1.  Reaction cross-section between neutron and 14N

    图  2  中子在大气中输运的几何模型

    Figure  2.  Geometry model of neutron transport in the atmosphere

    图  3  中子与低能中子面积分流和注量随距离变化

    Figure  3.  Neutron surface current and fluence vs. distances

    图  4  不同距离的中子次级γ能量释放率随时间变化

    Figure  4.  Neutron secondary gamma energy release rate vs time at different distances

    图  5  中子次级γ能量及能量释放率随距离变化

    Figure  5.  Neutron secondary gamma energy and energy release rate vs distances

    图  6  氮俘获γ能量释放率拟合参数公式

    Figure  6.  Fitting of neutron capture γ-ray energy release rate

    图  7  不同能量中子对氮俘获γ能量释放率随时间的变化

    Figure  7.  Neutron secondary gamma energy release rate vs. time for different neutron energy

    图  8  不同能量中子的氮俘获γ能量释放率拟合参数

    Figure  8.  Fitting parameters of neutron capture γ-ray energy release rate for different neutron energy

    表  1  采用不同减方差方法模拟所得γ注量率、相对误差及FOM因子

    Table  1.   Gamma ray fluence rate, relative error and FOM factor by using different variance reduction method

    distance/kmmethod of variance reductionfluence rate of γ at 1×10−2 s /(10−3cm−2·s−1)relative errorFOM factor
    2.0none59.88.1%2.7
    time splitting63.11.4%3.5
    geometry splitting62.42.3%11
    time splitting + geometry splitting62.20.6%13
    3.0none3.5736%0.14
    time splitting4.775.3%0.24
    geometry splitting4.714.9%2.4
    time splitting + geometry splitting4.581.1%3.2
    下载: 导出CSV

    表  2  不同距离球面处的中子及次级γ的平均能量

    Table  2.   Energy of neutron and secondary gamma at different distances

    distance/kmneutron energy/MeVgamma energy/MeV
    0.10.921.54
    0.30.391.46
    0.50.261.46
    1.00.171.33
    1.50.161.24
    2.00.181.24
    2.50.201.27
    3.00.231.32
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-02-25
  • 录用日期:  2022-04-28
  • 修回日期:  2022-04-22
  • 网络出版日期:  2022-04-29
  • 刊出日期:  2022-07-20

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