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Title: | Stellar s -process neutron capture cross sections on 78,80,84,86Kr determined via activation, atom trap trace analysis, and decay counting | Authors: | Tessler, M. Zappala, J. CRISTALLO, Sergio Roberti, L. Paul, M. Halfon, S. Heftrich, T. Jiang, W. Kijel, D. Kreisel, A. LIMONGI, Marco Lu, Z. -T. Müller, P. Purtschert, R. Reifarth, R. Shor, A. Veltum, D. Vescovi, D. Weigand, M. Weissman, L. |
Issue Date: | 2021 | Journal: | PHYSICAL REVIEW C | Number: | 104 | Issue: | 1 | First Page: | 015806 | Abstract: | We present a detailed account of neutron capture experiments of astrophysical relevance on <SUP>78,80,84,86<SUP>Kr (n ,γ ) reactions at the border between weak and main s process. The experiments were performed with quasi-Maxwellian neutrons from the Liquid-Lithium Target (LiLiT) and the mA-proton beam at 1.93 MeV (2-3 kW) of the Soreq Applied Research Accelerator Facility (SARAF). The setup yields high-intensity ≈40 keV quasi-Maxwellian neutrons (3-5 ×10<SUP>10</SUP> n /s) closely reproducing the conditions of s -process stellar nucleosynthesis. A sample of 100 mg of atmospheric, pre-nuclear-age Kr gas contained in a Ti spherical shell was activated in the LiLiT neutron field. The abundances of long-lived Kr isotopes (<SUP>81,85 g</SUP>Kr) were measured by atom counting via atom trap trace analysis (ATTA) at Argonne National Laboratory and low-level counting (LLC) at University of Bern. This work is the first measurement of a nuclear cross section using atom counting via ATTA. The activities of short-lived Kr isotopes (<SUP>79,85 m,87</SUP>Kr) were measured by γ -decay counting with a high-purity germanium detector. Maxwellian-averaged cross sections for s -process thermal energies are extracted. By comparison to reference values, our nucleosynthesis network calculations show that the experimental cross sections have a strong impact on calculated abundances of krypton and neighboring nuclides, in some cases improving agreement between theory and observations. <P /></SUP></SUP> | URI: | http://hdl.handle.net/20.500.12386/31551 | URL: | https://journals.aps.org/prc/abstract/10.1103/PhysRevC.104.015806 https://api.elsevier.com/content/abstract/scopus_id/85111800045 |
ISSN: | 2469-9985 | DOI: | 10.1103/PhysRevC.104.015806 | Bibcode ADS: | 2021PhRvC.104a5806T | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Tessler_2021_PRC_104_015806_compressed.pdf | Pdf editoriale | 2.95 MB | Adobe PDF | View/Open |
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