States in 65Cu from the 65Cu(p, p′ γ) reaction

Abstract

Levels in 65Cu up to an excitation energy of 2.7 MeV were studied through the 65Cu(p, p′ γ) reaction at incident proton energies E p = 5.25 and 6.0 MeV. Singles γ-ray spectra were obtained with a high resolution Ge(Li) detector at θ γ = 0°, 20°, 40°, 55°, 70°, and 90° and a second (monitor) Ge(Li) fixed at θ γ (monitor) = 90°. Transition energies were measured and levels deduced from the θ γ = 90° spectra with an accuracy better than ±0.5 keV. Branching ratios were extracted from the θ γ = 55° spectra. The lifetimes of two levels were determined through the Doppler shift attenuation method by studying the energy shift of γ-ray peaks in the angular distribution data. The analysis of angular distributions yielded multipole mixing ratios and J π values for several states. The experimental information obtained in this work, wherever complete, was employed to calculate reduced transition probabilities.