Spectroscopy in the Z = 49 ^108,110In isotopes: Lifetime measurements in shears bands

Excited states have been populated in ¹⁰⁸In and ¹¹⁰In in complementary backed- and thin-target experiments using the Stony Brook and the 8π Ge-detector arrays. The level schemes for both isotopes have been extended and modified, including the first observation of ΔI = 2 bands in ¹¹⁰In. Lifetimes of states in four ΔI = 1 bands and one ΔI = 2 band have been measured using the Doppler-shift attenuation method. Experimental total angular momenta and reduced transition strengths for the ΔI = 1 bands have been compared with tilted axis cranking predictions for shears bands with configurations involving one proton g_9/2 hole and one or three valence quasineutrons from the h_11/2 and g_7/2/d_5/2 orbitals. The ΔI = 2 bands have been compared with principal axis cranking predictions for configurations with two g_9/2 proton holes and a g_7/2 or d_5/2 proton and one-or three-quasineutron configurations involving the h_11/2 and g_7/2/d_5/2 orbitals. In general, there is good overall agreement for both the angular momenta and reduced transition strengths. The ΔI = 1 and ΔI = 2 bands have large J⁽²⁾B(E2) ratios as expected for the shears mechanism. The B(M1) strengths deduced for the ΔI = 1 bands show a decreasing trend as a function of spin, which is also a feature of the shears mechanism. Configuration assignments have been made for most observed bands based on comparisons with theory and systematics of neighboring nuclei.