A study of the low-lying levels in 61Ni

Electromagnetic decay properties for seventeen states in 61Ni have been examined by means of the 58Fe(α,nγ)61Ni reaction with Esub(α)=8 MeV and the 60Ni(d, pγ)61Ni reaction at Esub(d)=6 MeV. Mean lifetimes were obtained with the Doppler-shift attenuation method. Spins, parities, and mixing ratios were determined from angular correlation studies and linear polarization measurements. The combined results permit new Jsup(π) assignments of 7/2-, 5/2-, 7/2-, and 9/2+ for the levels at 1016, 1611, 2020 and 2123 keV, respectively. Experimental results, including transition strengths, are compared to shell model predictions. (Auth.)