Abundances for p-process nucleosynthesis
Abundances for p-process nucleosynthesis
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p-过程核合成的丰度
DOI：
10.1103/physrevc.77.045803
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
J. R. Laeter
中科院分区：
文献类型：
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作者：
J. R. Laeter
发展p-过程核合成模型的一个重要制约因素是，许多p-过程核素的丰度还不是很清楚。最近对p-过程的一项审查确定了对p-过程理论家特别重要的六种p-过程核素[M.Arnould和S.Goriely，Phys.代表384，1(2003)]。这些核素是：{sup 92，94}Mo，{sup 96，98}Ru，{sup 138}La和{sup 180}Ta{sup m}。没有这些同位素的准确丰度是因为有关元素的同位素组成没有经过测量所用的热电离质谱仪引起的同位素分馏校正。为了弥补这一不足，VG354质谱计用浓缩同位素的重量混合物进行了校准，以便能够获得这些元素的绝对同位素组成。虽然已经报道了{sup 92，94}Mo，{sup 138}La和{sup 180}Ta{sup m}的同位素丰度，但本文首次报道了{sup 96，98}Ru的绝对丰度，其数值与现有丰度相比有很大的降低。
An important constraint in developing models of p-process nucleosynthesis is that the abundances of many of the p-process nuclides are not well known. A recent review of the p-process has identified six p-process nuclides that are of particular significance to p-process theorists [M. Arnould and S. Goriely, Phys. Rep. 384, 1 (2003)]. These nuclides are {sup 92,94}Mo, {sup 96,98}Ru, {sup 138}La, and {sup 180}Ta{sup m}. The absence of accurate abundances for these isotopes is due to the fact that the isotopic composition of the elements concerned have not been corrected for isotope fractionation induced by the thermal ionization mass spectrometric instruments used to measure them. To remedy this deficiency, a VG 354 mass spectrometer was calibrated using gravimetric mixtures of enriched isotopes to enable the absolute isotopic compositions of these elements to be obtained. Although the isotopic abundances of {sup 92,94}Mo, {sup 138}La, and {sup 180}Ta{sup m} have previously been reported, the absolute abundances of {sup 96,98}Ru are reported for the first time in this article, with a significant reduction in the magnitude of the values as compared to existing abundances.