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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31551
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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