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

C. J. Chiara*, D. B. Fossan, V. P. Janzen, T. Koike, D. R. LaFosse, G. J. Lane, S. M. Mullins, E. S. Paul, D. C. Radford, H. Schnare, J. M. Sears, J. F. Smith, K. Starosta, P. Vaska, R. Wadsworth, D. Ward, S. Frauendorf

*Corresponding author for this work

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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 g9/2 hole and one or three valence quasineutrons from the h11/2 and g7/2/d5/2 orbitals. The ΔI = 2 bands have been compared with principal axis cranking predictions for configurations with two g9/2 proton holes and a g7/2 or d5/2 proton and one-or three-quasineutron configurations involving the h11/2 and g7/2/d5/2 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.

Original languageEnglish
Article number054314
Pages (from-to)543141-5431430
Number of pages4888290
JournalPhysical Review C - Nuclear Physics
Issue number5
Publication statusPublished - 1 Jan 2001

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