Experimental neutron capture data of ^58 Ni from the CERN n_TOF facility

Žugec, Petar and Bosnar, Damir and Wright, T. (n_TOF Collaboration) (2014) Experimental neutron capture data of ^58 Ni from the CERN n_TOF facility. Physical Review C, 89 (1). pp. 14605-9. ISSN 0556-2813

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The ^58 Ni(n,γ) cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances have been analyzed up to 122 keV. Maxwellian averaged cross sections (MACS) have been calculated for stellar temperatures of kT=5–100 keV with uncertainties of less than 6%, showing fair agreement with recent experimental and evaluated data up to kT = 50 keV. The MACS extracted in the present work at 30 keV is 34.2±0.6_stat±1.8_sys mb, in agreement with latest results and evaluations, but 12% lower relative to the recent KADoNIS compilation of astrophysical cross sections. When included in models of the s-process nucleosynthesis in massive stars, this change results in a 60% increase of the abundance of ^58 Ni, with a negligible propagation on heavier isotopes. The reason is that, using both the old or the new MACS, ^58 Ni is efficiently depleted by neutron captures.

Item Type: Article
Date: January 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jul 2014 11:00
Last Modified: 10 Jul 2014 11:00
URI: http://digre.pmf.unizg.hr/id/eprint/2390

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