Spectroscopy in the Z=49108,110In 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, and S. Frauendorf
Phys. Rev. C 64, 054314 – Published 18 October 2001
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Abstract

Excited states have been populated in 108In and 110In in complementary backed- and thin-target experiments using the Stony Brook and the 8πGe-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.

  • Received 22 March 2001

DOI:https://doi.org/10.1103/PhysRevC.64.054314

©2001 American Physical Society

Authors & Affiliations

C. J. Chiara1,*, D. B. Fossan1, V. P. Janzen2, T. Koike1, D. R. LaFosse1, G. J. Lane1,†, S. M. Mullins3,‡, E. S. Paul4, D. C. Radford2,§, H. Schnare1, J. M. Sears1, J. F. Smith1,∥, K. Starosta1, P. Vaska1,¶, R. Wadsworth5, D. Ward2,**, and S. Frauendorf6,7

  • 1Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800
  • 2AECL Research, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0
  • 3Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 4Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 5Department of Physics, University of York, Heslington, York Y01 5DD, United Kingdom
  • 6Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
  • 7Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, PF 510119, D01314 Dresden, Germany

  • *Present address: Department of Chemistry, Washington University, St. Louis, Missouri 63130.
  • Present address: Department of Nuclear Physics, Australian National University, Canberra ACT 0200, Australia.
  • Present address: National Accelerator Center, P.O. Box 72, Faure 7131, South Africa.
  • §Present address: Bldg. 6000, M. S. 6371, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6371.
  • Present address: Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom.
  • Present address: Medical Department, Brookhaven National Laboratory, Upton, New York 11973.
  • **Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720.

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Vol. 64, Iss. 5 — November 2001

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