Abstract
The 62Cu levels were investigated via three different reactions: 59Co(α, n) 62Cu (6.0 ≦ E α ≦ 11.0 MeV; γ-ray spectra, γ-γ and time-of-flight n-γ coincidence spectra), 60Ni( 3He, p) 62Cu (9.0 ≦ E 3 He ≦ 11.0 MeV; p-γ coincidence spectra) and 62Ni(p, n) 62Cu (5.5 ≦ E p ≦ 7.2 MeV; γ-ray spectra). The decay scheme deduced from these measurements includes about 80 new γ-ray transitions between 56 levels up to 3.6 MeV. The important 596-923-979-349-41 keV cascade originates from a level at 2888 keV and proceeds through the 2293, 1370, 390 and 41 keV excited states. Lifetimes determined by recoil-distance measurements are τ = 23.7 ± 1.8 ps for the 923 keV transition and τ < 3 ps for the 979 keV transition. Parallel measurements of the 59Co(α, p) 62Ni reaction (γ-γ and p-γ coincidence spectra) determined precise energies of 62Ni levels by means of their γ-rays cascades.
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