^62 Ni(n,γ) and ^63 Ni(n,γ) cross sections measured at the n_TOF facility at CERN

Lederer, C. and Bosnar, Damir and Žugec, Petar (n_TOF Collaboration) (2014) ^62 Ni(n,γ) and ^63 Ni(n,γ) cross sections measured at the n_TOF facility at CERN. Physical Review C, 89 (2). pp. 25810-11. ISSN 0556-2813

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Abstract

The cross section of the ^62 Ni(n,γ) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT= 5–100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT=30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the ^63 Ni(n,γ) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.

Item Type: Article
Date: February 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 11:03
Last Modified: 10 Jul 2014 11:03
URI: http://digre.pmf.unizg.hr/id/eprint/2386

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