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

Côté, Benoit and Eichler, Marius and López, Andrés Yagüe and Vassh, Nicole and Mumpower, Matthew R. and Világos, Blanka and Soős, Benjámin and Arcones, Almudena and Sprouse, Trevor M. and Surman, Rebecca and Pignatari, Marco and Pető, Mária K. and Wehmeyer, Benjamin and Rauscher, Thomas and Lugaro, Maria. (2021) 129-I and 247-Cm in meteorites constrain the last astrophysical source of solar r-process elements. Science, 371 (6532). pp. 945-948.

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Official URL: https://edoc.unibas.ch/82186/

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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 <span id="MathJax-Element-1-Frame" class="MathJax" style="position: relative;" tabindex="0" role="presentation" data-mathml=" ( &#x2243; 15.6 &#xA0;million&#xA0;years ) "> ( ≃ 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 129 I/ 247 Cm = 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association for the Advancement of Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:11 May 2021 09:48
Deposited On:11 May 2021 09:48

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