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Element abundance p...
Element abundance patterns in stars indicate fission of nuclei heavier than uranium
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Roederer, Ian U. (author)
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Vassh, Nicole (author)
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Holmbeck, Erika M. (author)
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Mumpower, Matthew R. (author)
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Surman, Rebecca (author)
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Cowan, John J. (author)
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Beers, Timothy C. (author)
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Ezzeddine, Rana (author)
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Frebel, Anna (author)
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- Hansen, Terese T (author)
- Stockholms universitet,Institutionen för astronomi
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Placco, Vinicius M. (author)
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Sakari, Charli M. (author)
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Science. - 0036-8075 .- 1095-9203. ; 382:6675
- Related links:
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https://urn.kb.se/re...
Abstract
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- The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and inaccessible to experiments so must be extrapolated by using nucleosynthesis models. We examined element abundances in a sample of stars that are enhanced in r-process elements. The abundances of elements ruthenium, rhodium, palladium, and silver (atomic numbers Z = 44 to 47; mass numbers A = 99 to 110) correlate with those of heavier elements (63 <= Z <= 78, A > 150). There is no correlation for neighboring elements (34 <= Z <= 42 and 48 <= Z <= 62). We interpret this as evidence that fission fragments of transuranic nuclei contribute to the abundances. Our results indicate that neutron-rich nuclei with mass numbers >260 are produced in r-process events.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
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- By the author/editor
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Roederer, Ian U.
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Vassh, Nicole
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Holmbeck, Erika ...
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Mumpower, Matthe ...
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Surman, Rebecca
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Cowan, John J.
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show more...
-
Beers, Timothy C ...
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Ezzeddine, Rana
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Frebel, Anna
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Hansen, Terese T
-
Placco, Vinicius ...
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Sakari, Charli M ...
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Science
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Stockholm University