Characterizing r -Process Sites through Actinide Production
Characterizing r -Process Sites through Actinide Production
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通过锕系元素生产表征 r 过程位点
DOI：
10.1088/1742-6596/1668/1/012020
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Beers, Timothy C.
中科院分区：
文献类型：
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作者：
Holmbeck, Erika M.;Surman, Rebecca;Frebel, Anna;McLaughlin, G. C.;Mumpower, Matthew R.;Sprouse, Trevor M.;Kawano, Toshihiko;Vassh, Nicole;Beers, Timothy C.
在用r-过程元素增强的恒星的元素丰度模式的变化中，相对锕系元素与镧系元素比率的变化是最显著的。我们调查这些锕系元素差异的来源，以确定这些变化是否是由于天体物理学站点的自然差异，或由于在r-过程站点访问的不确定的核属性。我们发现，恒星锕系元素相对丰度之间的变化很可能是天体物理性质的，因为r过程事件的喷出物可能富含中子。此外，如果一个r-过程网站是能够产生的变化，在其喷出的物质的中子丰度，那么只有一种类型的r-过程网站是需要解释所有水平的观察到的相对锕系元素的增强。
Of the variations in the elemental abundance patterns of stars enhanced with r-process elements, the variation in the relative actinide-to-lanthanide ratio is among the most significant. We investigate the source of these actinide differences in order to determine whether these variations are due to natural differences in astrophysical sites, or due to the uncertain nuclear properties that are accessed in r-process sites. We find that variations between relative stellar actinide abundances is most likely astrophysical in nature, owing to how neutron-rich the ejecta from an r-process event may be. Furthermore, if an r-process site is capable of generating variations in the neutron-richness of its ejected material, then only one type of r-process site is needed to explain all levels of observed relative actinide enhancements.