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Citation: ZHENG Hui, SUN Bo, LIU Hai-Feng, SONG Hai-Feng. Modeling of Helium Bubble Growth in Plutonium[J]. Acta Physico-Chimica Sinica, ;2015, 31(S1): 64-68. doi: 10.3866/PKU.WHXB2014Ac17 shu

Modeling of Helium Bubble Growth in Plutonium

1.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, P. R. China

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

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.
- Plutonium,
- Helium bubble,
- Growth,
- Collision cascade,
- Rate equation
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