<sup>129</sup>I and <sup>247</sup>Cm in meteorites constrain the last astrophysical source of solar r-process elements

doi:10.1126/science.aba1111

GSTDTAP > 气候变化

DOI	10.1126/science.aba1111
	¹²⁹I and ²⁴⁷Cm in meteorites constrain the last astrophysical source of solar r-process elements
	Benoit Côté; Marius Eichler; Andrés Yagüe López; Nicole Vassh; Matthew R. Mumpower; Blanka Világos; Benjámin Soós; Almudena Arcones; Trevor M. Sprouse; Rebecca Surman; Marco Pignatari; Mária K. Pető; Benjamin Wehmeyer; Thomas Rauscher; Maria Lugaro
	2021-02-26
发表期刊	Science
出版年	2021
英文摘要	Theoretical models predict that the synthesis of heavy elements by the rapid neutron capture process (r-process) occurs in extreme astrophysical environments such as neutron star mergers or some types of supernovae. Testing those predictions by comparing them with the isotopic record has been difficult. Côté et al. examined two r-process isotopes, iodine-129 and curium-247, both of which have half-lives of 15.6 million years. Therefore, their ratio remains constant even long after the nucleosynthesis event. The ratio of those isotopes at the time of Solar System formation is recorded in meteorites. Comparing this value with nuclear astrophysics calculations shows that the most likely source was moderately neutron-rich material ejected from a binary neutron star merger. Science , this issue p. [945][1] 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. [1]: /lookup/doi/10.1126/science.aba1111
领域	气候变化 ; 资源环境
URL	查看原文
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/315944
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Benoit Côté,Marius Eichler,Andrés Yagüe López,et al. ¹²⁹I and ²⁴⁷Cm in meteorites constrain the last astrophysical source of solar r-process elements[J]. Science,2021.
APA	Benoit Côté.,Marius Eichler.,Andrés Yagüe López.,Nicole Vassh.,Matthew R. Mumpower.,...&Maria Lugaro.(2021).¹²⁹I and ²⁴⁷Cm in meteorites constrain the last astrophysical source of solar r-process elements.Science.
MLA	Benoit Côté,et al."¹²⁹I and ²⁴⁷Cm in meteorites constrain the last astrophysical source of solar r-process elements".Science (2021).