Collective and two-quasiparticle excitations in 128Te

S. F. Hicks, J. C. Boehringer, N. Boukharouba, C. Fransen, S. R. Lesher, J. M. Mueller, J. R. Vanhoy, and S. W. Yates
Phys. Rev. C 86, 054308 – Published 15 November 2012

Abstract

Excited levels of 128Te to 3.3 in MeV excitation have been studied using γ-ray spectroscopy following inelastic scattering of accelerator-produced neutrons. Spectroscopic information, including transition energies, level spins, E2/M1 multipole-mixing ratios, and γ-ray branching ratios, was determined from γ-ray excitation functions measured from En=2.15–3.33 MeV in 90-keV increments, γ-ray angular distributions measured at En=2.2, 2.8, and 3.3 MeV, and γγ coincidences measured at En=3.6 MeV. Lifetimes of levels in 128Te were deduced using Doppler-shift attenuation techniques. Absolute transition probabilities were determined for many levels and compared to interacting boson model and particle-core coupling model calculations to identify few particle and collective structures; states exhibiting the decay characteristics expected for two-phonon, mixed-symmetry, and quadrupole-octupole coupled states are identified.

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  • Received 17 May 2012

DOI:https://doi.org/10.1103/PhysRevC.86.054308

©2012 American Physical Society

Authors & Affiliations

S. F. Hicks1,*, J. C. Boehringer1, N. Boukharouba2,3, C. Fransen2,4, S. R. Lesher2,5, J. M. Mueller6, J. R. Vanhoy6, and S. W. Yates2,7

  • 1Department of Physics, University of Dallas, Irving, Texas 75062, USA
  • 2Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA
  • 3Department of Physics, University of Guelma, Guelma 24000, Algeria
  • 4Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 5Department of Physics, University of Wisconsin-La Crosse, La Crosse, Wisconsin 54601, USA
  • 6Department of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA
  • 7Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA

  • *Electronic address: hicks@udallas.edu

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Issue

Vol. 86, Iss. 5 — November 2012

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