Solid methane in neutron radiation: Cryogenic moderators and cometary cryo volcanism
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Solid methane in neutron radiation: Cryogenic moderators and cometary cryo volcanism

机译：中子辐射中的固体甲烷：低温主持人和彗星冷冻火山

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Highlights?A model of radiolysis defect recombination in solid methane is shown.?The model is in good agreement with solid methane moderator test results.?Radiolysis defect recombination occurs at two different temperatures.?Results could be used for designing new methane moderators for neutron sources.?An application relating to cryo-volcanism on comets is discussed.AbstractThe effect of ionizing radiation on solid methane has previously been an area of interest in the astrophysics community. In the late 1980s this interest was further boosted by the possibility of using solid methane as a moderating medium in spallation neutron sources. Here we present test results of solid methane moderators commissioned at the ISIS neutron source, and compare them with a model based on the theory of thermal explosion. Good agreement between the moderator test data and our model suggests that the process of radiolysis defect recombination happens at two different temperature ranges: the “lower temperature” recombination process occurs at around 20?K, with the “higher temperature” process taking place between 50 and 60?K. We discuss consequences of this mechanism for the designing and operation of solid methane moderators used in advanced neutron sources. We also discuss the possible role of radiolysis defect recombination processes in cryo-volcanism on comets, and suggest an application based on this phenomenon.]]>
机译：<！[cdata [ 亮点 ？ 显示了固体甲烷中的放射性分解缺陷重组模型。 ？ 该模型与良好协议固体甲烷调节剂测试结果。 ？ 放射性分解缺陷重组发生在两个不同的温度下发生。 ？ 结果可用于设计新的甲烷主持人for子n来源。 ？ 讨论了与Couro-Volcanism上的应用程序。 抽象 电离辐射对固体甲烷的影响先前是在天体物理学中的感兴趣区域社区。在20世纪80年代后期，这种兴趣进一步推动了在介质中子源中使用固体甲烷作为调节介质的可能性。在这里，我们呈现在ISIS中子源委托的固体甲烷中间剂的测试结果，并将它们与基于热爆炸理论的模型进行比较。主持人测试数据与我们的模型之间的良好一致性建议在两个不同的温度范围内发生辐射性缺陷重组的过程：“较低温度”重组过程发生在约20〜k，“较高温度”过程发生在50之间和60？k。我们讨论了这种机制的后果，用于高中中子源使用的固体甲烷中间剂的设计和运行。我们还讨论了放射性缺陷重组过程在Cro-Plcanism上的可能作用，并建议基于这种现象的应用。 ] ]

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