物理化学学报 >> 2015, Vol. 31 >> Issue (Suppl): 64-68.doi: 10.3866/PKU.WHXB2014Ac17

研究论文 上一篇    下一篇

钚中氦泡生长模型

郑晖, 孙博, 刘海风, 宋海峰   

  1. 北京应用物理与计算数学研究所, 北京100094
  • 发布日期:2015-05-20
  • 通讯作者: 郑晖 E-mail:zheng_hui@iapcm.ac.cn
  • 基金资助:

    国家磁约束聚变研究计划专项(2011GB108003), 中国工程物理研究院专项基金(9090902)和中国工程物理研究院中子物理学重点实验室基金(2012AB02)资助

Modeling of Helium Bubble Growth in Plutonium

ZHENG Hui, SUN Bo, LIU Hai-Feng, SONG Hai-Feng   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, P. R. China
  • Published:2015-05-20
  • Contact: ZHENG Hui E-mail:zheng_hui@iapcm.ac.cn
  • Supported by:

    The project was supported by the National Magnetic Confinement Fusion Program, China (2011GB108003), Special Foundation of China Academy of Engineering Physics (9090902), and Foundation of Key Laboratory of Neutron Physics, China Academy of Engineering Physics (2012AB02).

摘要:

239Pu核自发衰变产生的氦原子在材料中聚集形成氦泡, 氦泡生长是钚材料老化的重要因素之一. 通过分子动力学模拟, 发现钚核自发衰变引起的原子级联碰撞过程可导致影响区域内的氦泡散裂, 对氦泡生长的影响不可忽略, 这是传统速率方程理论不能很好描述钚中氦泡生长数据的一个重要原因. 通过改进Schaldach-Wolfer 速率方程模型, 并选取适当的级联碰撞影响因子, 得到与实验数据较好符合的理论结果, 最后预测了100年内室温储存的钚中氦泡生长行为.

关键词: 钚, 氦泡, 生长, 级联碰撞, 速率方程

Abstract:

The agglomeration of helium atoms created by nuclear fission in plutonium is an important factor in plutonium aging. Using molecular dynamic simulation we found that atomic collision cascades had a significant effect on the stability of helium bubbles, which is a possible reason why rate-equation theory cannot well describe helium bubble growth in aged plutonium. We improved Schaldach-Wolfer theory by considering atomic collision cascade effects, and the theoretical results agreed well with the experimental data and predicted the behavior of helium bubbles in plutonium at room temperature in 100 years.

Key words: Plutonium, Helium bubble, Growth, Collision cascade, Rate equation

MSC2000: 

  • O648