62Ni(n,gamma) and 63Ni(n,gamma) cross sections measured at the n_TOF facility at CERN
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European Commisision's projectENSAR - European Nuclear Science and Applications Research (EC-FP7-262010)
The cross section of the Ni62(n,gamma) 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,¿) 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.
CitationLederer, C. [et al.]. 62Ni(n,gamma) and 63Ni(n,gamma) cross sections measured at the n_TOF facility at CERN. "Physical review C", 28 Febrer 2014, vol. 89, núm. 2, p. 025810-1-025810-11.
|20140228_PhysRevC.89.025810.pdf||62Ni(n,gamma) and 63Ni(n,gamma) cross sections measured at the n_TOF facility at CERN||1,287Mb||Restricted access|