Modelling the formation of fission tracks in apatite minerals using molecular dynamics simulations

Modelling the formation of fission tracks in apatite minerals using molecular dynamics simulations
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使用分子动力学模拟模拟磷灰石矿物中裂变径迹的形成

DOI:
10.1007/s00269-008-0250-6
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发表时间:
2008
影响因子:
1.4
通讯作者:
Rabone J
Rabone J
中科院分区:
地球科学4区
文献类型:
--
作者:
Rabone J

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介绍了一种在经典分子动力学框架内模拟裂变径迹形成的“离子爆炸尖峰”机制的简单方法。将该方法应用于六种磷灰石成分,并将得到的轨迹相互比较,以及与另一种机制--“位移尖峰”造成的损伤进行比较。与实验观察到的轨迹不同,模拟轨迹的半径不依赖于它们在晶体中的方向。由于模拟准确地模拟了磷灰石的弹性响应,这表明实验观察到的沿不同晶体方向的轨迹半径的差异并不完全是由磷灰石弹性的各向异性造成的。我们认为,裂变碎片电场与晶体离子相互作用的各向异性是影响裂变径迹最终半径的主要因素。在氟磷灰石中,模拟还揭示了在裂变径迹的核心形成小的类萤石物质簇,这一现象尚未得到实验证实。
We introduce a simple method to simulate the “ion explosion spike” mechanism of fission track formation within the framework of classical molecular dynamics. The method is applied to six apatite compositions and the resulting tracks are compared with each other as well as with the damage produced by another mechanism—the “Displacement spike”. In contrast to experimentally observed tracks, the radii of simulated tracks are not dependent on their direction in the crystal. Since the simulations model accurately the elastic response of apatites, this suggests that the experimentally observed difference in track radii for tracks along different crystal directions is not entirely caused by anisotropy in the elasticity of apatite. We suggest that anisotropy in the interactions between the electric fields of fission fragments and the crystal ions is a major factor in the final radii of fission tracks. In fluorapatite, the simulations also reveal the formation of small clusters of fluorite-like material in the core of the fission track, a phenomenon which has yet to be confirmed experimentally.
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