62Ni(n, γ) and 63Ni(n, γ) cross sections measured at n TOF/CERN

Lederer, C. and Massimi, C. and Berthoumieux, E. and Colonna, N. and Dressler, R. and Guerrero, C. and Gunsing, F. and Käppeler, F. and Kivel, N. and Pignatari, Marco and Reifarth, R. and Schumann, D. and Wallner, A. and Altstadt, S. and Andriamonje, S. and Andrzejewski, J. and Audouin, L. and Barbagallo, M. and Bécares, V. and Becvár, F. and Belloni, F. and Berthier, B. and Billowes, J. and Boccone, V. and Bosnar, D. and Brugger, M. and Calviani, M. and Calviño, F. and Cano-Ott, D. and Carrapiço, C. (2014) 62Ni(n, γ) and 63Ni(n, γ) cross sections measured at n TOF/CERN. PHYSICAL REVIEW C, 89 (2). ISSN 2469-9985

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Abstract

The cross section of the 62Ni(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 63Ni(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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