A high-resolution 62Ni(p,γ)63Cu study

The γ-ray decay of ten selected 62Ni(p,γ)63Cu resonances in the proton-energy range Esub(p)=1.15-1.70 MeV has been measured with a Compton suppression spectrometer. Analysis of these measurements provides detailed information about the decay of about one hundred bound states. This includes more than fifty levels, which have up to now not been observed. Excitation-energy measurements, necessary to study the very complicated decay schemes, are performed with an average uncertainty of 30 ppm. Resonance energies with a precision of typically 0.1 keV have been determined by comparing the 62Ni(p,γ) yield curves with 27Al(p,γ) resonance yield curves. The reaction Q-value is found to be Q=6122.35+-0.09 keV. Shell-model calculations have been performed in a 2psub(3/2), 1fsub(5/2) and 2psub(1/2) configuration space with a closed 56Ni core. The calculated excitation energies agree quite well with the experimental values. (orig.)