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

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

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
Volume64
Issue number5
DOIs
Publication statusPublished - 2001 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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