WEAK s-PROCESS IRRADIATIONS.
WEAK s-PROCESS IRRADIATIONS.
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弱 s 过程辐射。
DOI：
10.1086/151450
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
D. Clayton
中科院分区：
文献类型：
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作者：
J. Peters;W. Fowler;D. Clayton
我们计算了稀有富中子物种的过剩时，硅和镍之间的种子核暴露于小中子辐照，以确定这些物种是否可能欠他们的自然丰度这样一个原因，特别注意的是54 Cr和58 Fe，两个相对突出的富中子物种，已被绕过爆炸核合成的计算。虽然58 Fe有可能是由于弱s过程产生的，但54 Cr似乎不太可能与它沿着产生，因为它的过剩丰度比55 Fe少得多。然而，关键的中子俘获截面的不确定性并不允许这种说法明确无误。此外，如果58 Fe是由于弱s过程辐射造成的，那么某些较轻的物种（例如Cl和41 K）似乎也必须在s过程中合成。e认为这是不可能的，因此怀疑s-过程在这些核的合成中发挥了重要作用。因此，54 Cr和58 Fe的起源仍然是一个谜。排除了Amiet和Zek提出的反过程核是s过程的重种子的观点。
We calculate the overabundances of rare neutron-rich species produced when seed nuclei between silicon and nickel are exposed to small neutron irradiations in order to ascertain whether those species may owe their natural abundances to such a cause, Particular attention is given to 54Cr and 58Fe, two relatively prominent neutron-rich species that have been bypassed by calculation of explosive nucleosynthesis. Although it is possible that 58Fe is due to weak s-processes, it seems unlikely that 54Cr can be produced along with it because its calculated overabundance is so much less than that of 55Fe. Uncertainties in key neutron-capture cross-sections do not allow this statement to be made unequivocally, however. If 58Fe is due to weak s-process irradiations, moreover, it seems that certain lighter species syn thesixed satisfactorily in explosive oxygen and silicon burning, such as Cl and 41K, must also be synthesixed in the s-process. e regard this as unlikely and therefore doubt that the s-process has played a major role in the synthesis of these nuclei. Accordingly, the origins of 54Cr and 58Fe remain somewhat of a mystery. The suggestion of Amiet and Zek that the rtrocess nuclei are the heavy seeds for the s-process is ruled out.