60 Fe and 244 Pu deposited on Earth constrain the r-process yields of recent nearby supernovae.
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| Title: | 60 Fe and 244 Pu deposited on Earth constrain the r-process yields of recent nearby supernovae. |
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| Authors: | Wallner, A., Froehlich, M. B., Hotchkis, M. A. C., Kinoshita, N., Paul, M., Martschini, M., Pavetich, S., Tims, S. G., Kivel, N., Schumann, D., Honda, M., Matsuzaki, H., Yamagata, T. |
| Source: | Science (pre-March 2025). 5/14/2021, Vol. 371 Issue 6543, p742-745. 4p. 2 Charts, 2 Graphs. |
| Subjects: | Supernovae, Nuclear astrophysics, Neutron stars, Pulsars, Nucleosynthesis |
| Abstract: | Half of the chemical elements heavier than iron are produced by the rapid neutron capture process (r-process). The sites and yields of this process are disputed, with candidates including some types of supernovae (SNe) and mergers of neutron stars. We search for two isotopic signatures in a sample of Pacific Ocean crust—iron-60 (60Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and plutonium-244 (244Pu) (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of 60Fe to Earth in the last 10 million years and accompanying lower quantities of 244Pu. The 244Pu/60Fe influx ratios are similar for both events. The 244Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources. [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 |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 150277878 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: 60 Fe and 244 Pu deposited on Earth constrain the r-process yields of recent nearby supernovae. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Wallner%2C+A%2E%22">Wallner, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Froehlich%2C+M%2E+B%2E%22">Froehlich, M. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Hotchkis%2C+M%2E+A%2E+C%2E%22">Hotchkis, M. A. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Kinoshita%2C+N%2E%22">Kinoshita, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Paul%2C+M%2E%22">Paul, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Martschini%2C+M%2E%22">Martschini, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Pavetich%2C+S%2E%22">Pavetich, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Tims%2C+S%2E+G%2E%22">Tims, S. G.</searchLink><br /><searchLink fieldCode="AR" term="%22Kivel%2C+N%2E%22">Kivel, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Schumann%2C+D%2E%22">Schumann, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Honda%2C+M%2E%22">Honda, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Matsuzaki%2C+H%2E%22">Matsuzaki, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Yamagata%2C+T%2E%22">Yamagata, T.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 5/14/2021, Vol. 371 Issue 6543, p742-745. 4p. 2 Charts, 2 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Supernovae%22">Supernovae</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+astrophysics%22">Nuclear astrophysics</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+stars%22">Neutron stars</searchLink><br /><searchLink fieldCode="DE" term="%22Pulsars%22">Pulsars</searchLink><br /><searchLink fieldCode="DE" term="%22Nucleosynthesis%22">Nucleosynthesis</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Half of the chemical elements heavier than iron are produced by the rapid neutron capture process (r-process). The sites and yields of this process are disputed, with candidates including some types of supernovae (SNe) and mergers of neutron stars. We search for two isotopic signatures in a sample of Pacific Ocean crust—iron-60 (60Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and plutonium-244 (244Pu) (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of 60Fe to Earth in the last 10 million years and accompanying lower quantities of 244Pu. The 244Pu/60Fe influx ratios are similar for both events. The 244Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1126/science.aax3972 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 742 Subjects: – SubjectFull: Supernovae Type: general – SubjectFull: Nuclear astrophysics Type: general – SubjectFull: Neutron stars Type: general – SubjectFull: Pulsars Type: general – SubjectFull: Nucleosynthesis Type: general Titles: – TitleFull: 60 Fe and 244 Pu deposited on Earth constrain the r-process yields of recent nearby supernovae. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Wallner, A. – PersonEntity: Name: NameFull: Froehlich, M. B. – PersonEntity: Name: NameFull: Hotchkis, M. A. C. – PersonEntity: Name: NameFull: Kinoshita, N. – PersonEntity: Name: NameFull: Paul, M. – PersonEntity: Name: NameFull: Martschini, M. – PersonEntity: Name: NameFull: Pavetich, S. – PersonEntity: Name: NameFull: Tims, S. G. – PersonEntity: Name: NameFull: Kivel, N. – PersonEntity: Name: NameFull: Schumann, D. – PersonEntity: Name: NameFull: Honda, M. – PersonEntity: Name: NameFull: Matsuzaki, H. – PersonEntity: Name: NameFull: Yamagata, T. IsPartOfRelationships: – BibEntity: Dates: – D: 14 M: 05 Text: 5/14/2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 00368075 Numbering: – Type: volume Value: 371 – Type: issue Value: 6543 Titles: – TitleFull: Science (pre-March 2025) Type: main |
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