| Summary: | 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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