The Effects of Variations in Nuclear Processes on Type I X-Ray Burst Nucleosynthesis
The Effects of Variations in Nuclear Processes on Type I X-Ray Burst Nucleosynthesis
复制标题
核过程变化对 I 型 X 射线爆发核合成的影响
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
C. Iliadis
中科院分区：
文献类型：
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作者：
A. Parikh;J. José;F. Moreno;C. Iliadis
I型X射线爆发是一种猛烈的恒星事件，发生在吸积的中子星的富氢/氦包层中。我们研究了核过程中的不确定性对伴随这些爆炸现象的核合成所起的作用。在后处理计算的框架内采用了两种不同的方法。在第一种情况下，核速率在不确定的情况下是不同的。已经考虑了10种不同的模型，涵盖了这些恒星事件的特征参数空间。第二种具有一定互补性的方法涉及蒙特卡罗编码，在该编码中，所有核速率同时在不确定范围内随机变化。总而言之，在这项工作中进行了大约50,000次后处理计算，网络包含606个核素(H到113Xe)和3500多个核过程。概述了这两种程序之间的简要比较，并概述了在我们的X射线爆发核合成研究中对其不确定性影响最大的关键核反应。
Type I X-ray bursts are violent stellar events that take place in the H/He-rich envelopes of accreting neutron stars. We have investigated the role played by uncertainties in nuclear processes on the nucleosynthesis accompanying these explosive phenomena. Two different approaches have been adopted, in the framework of postprocessing calculations. In the first one, nuclear rates are varied individually within uncertainties. Ten different models, covering the characteristic parameter space for these stellar events, have been considered. The second, somewhat complementary approach involves a Monte Carlo code in which all nuclear rates are randomly varied within uncertainty limits simultaneously. All in all, about 50,000 postprocessing calculations, with a network containing 606 nuclides (H to 113Xe) and more than 3500 nuclear processes, have been performed in this work. A brief comparison between both procedures is outlined together with an overall account of the key nuclear reactions whose uncertainties have the largest impact in our X-ray burst nucleosynthesis studies.