دورية أكاديمية
Element abundance patterns in stars indicate fission of nuclei heavier than uranium.
| العنوان: | Element abundance patterns in stars indicate fission of nuclei heavier than uranium. |
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| المؤلفون: | Roederer IU; Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA., Vassh N; TRIUMF (Tri-University Meson Facility), Vancouver, BC V6T 2A3, Canada., Holmbeck EM; Carnegie Observatories, Pasadena, CA 91101, USA., Mumpower MR; Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.; Center for Theoretical Astrophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA., Surman R; Department of Physics and Astronomy, University of Notre Dame, Notre Dame, IN 46556, USA., Cowan JJ; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA., Beers TC; Department of Physics and Astronomy, University of Notre Dame, Notre Dame, IN 46556, USA., Ezzeddine R; Department of Astronomy, University of Florida, Bryant Space Science Center, Gainesville, FL 32611, USA., Frebel A; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Hansen TT; Department of Astronomy, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden., Placco VM; National Optical-Infrared Astronomy Research Laboratory, National Science Foundation, Tucson, AZ 85719, USA., Sakari CM; Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA. |
| المصدر: | Science (New York, N.Y.) [Science] 2023 Dec 08; Vol. 382 (6675), pp. 1177-1180. Date of Electronic Publication: 2023 Dec 07. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Association for the Advancement of Science Country of Publication: United States NLM ID: 0404511 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1095-9203 (Electronic) Linking ISSN: 00368075 NLM ISO Abbreviation: Science Subsets: PubMed not MEDLINE; MEDLINE |
| أسماء مطبوعة: | Publication: Original Publication: New York, N.Y. : [s.n.] 1880- |
| مستخلص: | 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. |
| تواريخ الأحداث: | Date Created: 20231207 Latest Revision: 20231207 |
| رمز التحديث: | 20231215 |
| DOI: | 10.1126/science.adf1341 |
| PMID: | 38060658 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1095-9203 |
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| DOI: | 10.1126/science.adf1341 |