Level structure in double odd 104Ag

Abstract

The level structure of the odd-odd 47 104Ag 57 nucleus has been studied using the 103Rh(α,3nγ) 104Ag reaction. The assignment of γ-rays to 104Ag and the construction of the level scheme are based on relative excitation function and γ- γ- Δt coincidence experiments. Spins and parities of levels are proposed on the basis of the angular distribution of γ-rays and conversion electron measurements. Excited states with spin value up to J π = 13 + have been observed. The 212.1 keV; J π = 7 + level was found to decay with T 1 2 = 1.4±0.2 ns while for the 112.6 and 387.0 keV levels upper limits of T 1 2 < 1 ns and T 1 2 ≦ 0.4 ns , respectively, were obtained. A positive-parity band with spin sequence ΔI = 1 based on the J π = 5 + ground state has been identified. This band is interpreted as resulting from the coupling of the π g 9 2 ν g 7 2 proton-neutron configuration to the even-even moderately deformed core. Performed calculations on the basis of the Nilsson model (at deformation ε = 0.15) with Coriolis interaction reproduce well the observed band and the electromagnetic transition probabilities when taking into account attenuation of the Coriolis interaction α = 0.55.