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Ni62(n,γ) and Ni63(n,γ) cross sections measured at the n_TOF facility at CERN

Abstract : The cross section of the Ni62(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 Ni63(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.
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Submitted on : Tuesday, June 24, 2014 - 3:18:56 PM
Last modification on : Monday, December 13, 2021 - 9:15:22 AM

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C. Lederer, L. Audouin, B. Berthier, L. S. Leong, L. Tassan-Got, et al.. Ni62(n,γ) and Ni63(n,γ) cross sections measured at the n_TOF facility at CERN. Physical Review C, American Physical Society, 2014, 89, pp.025810. ⟨10.1103/PhysRevC.89.025810⟩. ⟨in2p3-01011765⟩



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