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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Origin of the p-process radionuclides 92Nb and 146Sm in the early solar system and inferences on the birth of the Sun
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Origin of the p-process radionuclides 92Nb and 146Sm in the early solar system and inferences on the birth of the Sun

机译：早期太阳系中p过程放射性核素92Nb和146Sm的起源以及太阳诞生的推论

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摘要

The abundances of 92Nb and 146Sm in the early solar system are determined from meteoritic analysis, and their stellar production is attributed to the p process. We investigate if their origin from thermonuclear supernovae deriving from the explosion of white dwarfs with mass above the Chandrasekhar limit is in agreement with the abundance of 53Mn, another radionuclide present in the early solar system and produced in the same events. A consistent solution for 92Nb and 53Mn cannot be found within the current uncertainties and requires the 92Nb/92Mo ratio in the early solar system to be at least 50% lower than the current nominal value, which is outside its present error bars. A different solution is to invoke another production site for 92Nb, which we find in the α-rich freezeout during core-collapse supernovae from massive stars. Whichever scenario we consider, we find that a relatively long time interval of at least ∼10 My must have elapsed from when the star-forming region where the Sun was born was isolated from the interstellar medium and the birth of the Sun. This is in agreement with results obtained from radionuclides heavier than iron produced by neutron captures and lends further support to the idea that the Sun was born in a massive star-forming region together with many thousands of stellar siblings.
机译：根据气象分析确定了早期太阳系中 92 Nb和 146 Sm的丰度，其恒星产生归因于p过程。我们调查了它们的起源是否来自质量超过Chandrasekhar极限的白矮星爆炸所产生的热核超新星，它是否与 53 Mn的丰度相吻合，Mn是早期太阳系中存在并在太阳系中产生的另一种放射性核素。同样的事件。在当前不确定性范围内无法找到一致的解决方案 92 Nb和 53 Mn，需要 92 Nb / 92 早期太阳系中的Mo比至少比当前标称值低50％，这超出了其当前误差范围。另一种解决方案是调用另一个 92 Nb的生产站点，我们在大质量恒星坍塌超新星期间的富含α的冻结中发现了该站点。无论我们考虑哪种情况，我们都发现从太阳诞生的恒星形成区域与星际介质和太阳的诞生隔离开来，至少要经过大约10 My的较长时间间隔。这与从放射性核素获得的结果相符，放射性核素比中子捕获产生的铁重，并且进一步支持了太阳与成千上万个恒星同胞一起诞生在巨大恒星形成区域的想法。

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