Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (Suppl): 64-68.doi: 10.3866/PKU.WHXB2014Ac17

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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
  • 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).


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


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