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

Côté, Benoit; Eichler, Marius; Yagüe, Andrés; Vassh, Nicole; R. Mumpower, Matthew; Világos, Blanka; Soós, Benjámin; Arcones, Almudena; M. Sprouse, Trevor; Surman, Rebecca; Pignatari, Marco; Pet?, Mária K.; Wehmeyer, Benjamin; Rauscher, Thomas; Lugaro, Maria


Benoit Côté

Marius Eichler

Andrés Yagüe

Nicole Vassh

Matthew R. Mumpower

Blanka Világos

Benjámin Soós

Almudena Arcones

Trevor M. Sprouse

Rebecca Surman

Marco Pignatari

Mária K. Pet?

Benjamin Wehmeyer

Thomas Rauscher

Maria Lugaro


Meteoritic analysis demonstrates that radioactive nuclei heavier than iron were present in the early Solar System. Among them, $^{129}$I and $^{247}$Cm both have a rapid neutron-capture process ($r$ process) origin and decay on the same timescale ($\simeq$ 15.6 Myr). We show that the $^{129}$I/$^{247}$Cm abundance ratio in the early Solar System (438$\pm$184) is immune to galactic evolution uncertainties and represents the first direct observational constraint for the properties of the last $r$-process event that polluted the pre-solar nebula. We investigate the physical conditions of this event using nucleosynthesis calculations and demonstrate that moderately neutron-rich ejecta can produce the observed ratio. We conclude that a dominant contribution by exceedingly neutron-rich ejecta is highly disfavoured.


Côté, B., Eichler, M., Yagüe, A., Vassh, N., R. Mumpower, M., Világos, B., …Lugaro, M. (2021). 129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements. Science, 371(6532), 945-948.

Journal Article Type Article
Acceptance Date Jan 25, 2021
Online Publication Date Feb 26, 2021
Publication Date Feb 26, 2021
Deposit Date Dec 17, 2020
Publicly Available Date Mar 22, 2021
Journal Science
Print ISSN 0036-8075
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 371
Issue 6532
Pages 945-948
Keywords Solar and Stellar Astrophysics; High Energy Astrophysical Phenomena; Nuclear Theory
Public URL


Article (1.2 Mb)

Copyright Statement
This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science vol. 371, 26 Feb 2021, 10.1126/science.aba1111

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