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

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Title: 129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements.
Authors: Côté, Benoit, Eichler, Marius, López, Andrés Yagüe, Vassh, Nicole, Mumpower, Matthew R., Világos, Blanka, Soós, Benjámin, Arcones, Almudena, Sprouse, Trevor M., Surman, Rebecca, Pignatari, Marco, Peto, Mária K., Wehmeyer, Benjamin, Rauscher, Thomas, Lugaro, Maria
Source: Science (pre-March 2025). 2/26/2021, Vol. 371 Issue 6532, p945-948. 4p. 2 Diagrams, 1 Chart.
Subjects: Solar system, Planetary systems, Meteorites, Neutron capture, Nuclear physics
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: 129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements.
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  Data: <searchLink fieldCode="AR" term="%22Côté%2C+Benoit%22">Côté, Benoit</searchLink><br /><searchLink fieldCode="AR" term="%22Eichler%2C+Marius%22">Eichler, Marius</searchLink><br /><searchLink fieldCode="AR" term="%22López%2C+Andrés+Yagüe%22">López, Andrés Yagüe</searchLink><br /><searchLink fieldCode="AR" term="%22Vassh%2C+Nicole%22">Vassh, Nicole</searchLink><br /><searchLink fieldCode="AR" term="%22Mumpower%2C+Matthew+R%2E%22">Mumpower, Matthew R.</searchLink><br /><searchLink fieldCode="AR" term="%22Világos%2C+Blanka%22">Világos, Blanka</searchLink><br /><searchLink fieldCode="AR" term="%22Soós%2C+Benjámin%22">Soós, Benjámin</searchLink><br /><searchLink fieldCode="AR" term="%22Arcones%2C+Almudena%22">Arcones, Almudena</searchLink><br /><searchLink fieldCode="AR" term="%22Sprouse%2C+Trevor+M%2E%22">Sprouse, Trevor M.</searchLink><br /><searchLink fieldCode="AR" term="%22Surman%2C+Rebecca%22">Surman, Rebecca</searchLink><br /><searchLink fieldCode="AR" term="%22Pignatari%2C+Marco%22">Pignatari, Marco</searchLink><br /><searchLink fieldCode="AR" term="%22Peto%2C+Mária+K%2E%22">Peto, Mária K.</searchLink><br /><searchLink fieldCode="AR" term="%22Wehmeyer%2C+Benjamin%22">Wehmeyer, Benjamin</searchLink><br /><searchLink fieldCode="AR" term="%22Rauscher%2C+Thomas%22">Rauscher, Thomas</searchLink><br /><searchLink fieldCode="AR" term="%22Lugaro%2C+Maria%22">Lugaro, Maria</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 2/26/2021, Vol. 371 Issue 6532, p945-948. 4p. 2 Diagrams, 1 Chart.
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  Data: <searchLink fieldCode="DE" term="%22Solar+system%22">Solar system</searchLink><br /><searchLink fieldCode="DE" term="%22Planetary+systems%22">Planetary systems</searchLink><br /><searchLink fieldCode="DE" term="%22Meteorites%22">Meteorites</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+capture%22">Neutron capture</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+physics%22">Nuclear physics</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: 2/26/2021
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