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129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements
Science ( IF 56.9 ) Pub Date : 2021-02-26 , DOI: 10.1126/science.aba1111
Benoit Côté 1, 2, 3 , Marius Eichler 4 , Andrés Yagüe López 1 , Nicole Vassh 5 , Matthew R. Mumpower 6, 7 , Blanka Világos 1, 2 , Benjámin Soós 1, 2 , Almudena Arcones 4, 8 , Trevor M. Sprouse 5, 6 , Rebecca Surman 5 , Marco Pignatari 1, 9 , Mária K. Pető 1 , Benjamin Wehmeyer 1, 10 , Thomas Rauscher 10, 11 , Maria Lugaro 1, 2, 12
Affiliation  

The composition of the early Solar System can be inferred from meteorites. Many elements heavier than iron were formed by the rapid neutron capture process (r-process), but the astrophysical sources where this occurred remain poorly understood. We demonstrate that the near-identical half-lives (15.6 million years) of the radioactive r-process nuclei iodine-129 and curium-247 preserve their ratio, irrespective of the time between production and incorporation into the Solar System. We constrain the last r-process source by comparing the measured meteoritic ratio 129I/247Cm = 438 ± 184 with nucleosynthesis calculations based on neutron star merger and magneto-rotational supernova simulations. Moderately neutron-rich conditions, often found in merger disk ejecta simulations, are most consistent with the meteoritic value. Uncertain nuclear physics data limit our confidence in this conclusion.



中文翻译:

陨石中的129I和247Cm限制了太阳r过程元素的最后天体来源

可以从陨石推断出早期太阳系的组成。快速中子俘获过程(r过程)形成了许多比铁重的元素,但是发生这种情况的天体物理来源仍然知之甚少。我们证明了几乎相同的半衰期15.6 百万年放射性r-过程核碘129和ium 247的比例保持不变,而与生产和掺入太阳系之间的时间无关。我们通过将测得的陨石比率129 I / 247 Cm = 438±184与基于中子星合并和磁旋转超新星模拟的核合成计算进行比较,来约束最后一个r过程源。通常在合并盘弹出模拟中发现的中等中子富集条件与气象学值最一致。不确定的核物理数据限制了我们对该结论的信心。

更新日期:2021-02-26
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