Intruder structures observed in 122Te through inelastic neutron scattering

S. F. Hicks, G. K. Alexander, C. A. Aubin, M. C. Burns, C. J. Collard, M. M. Walbran, J. R. Vanhoy, E. Jensen, P. E. Garrett, M. Kadi, A. Martin, N. Warr, S. W. Yates

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21 Scopus citations

Abstract

The excited levels of 122Te to 3.3-MeV excitation have been studied using γ-ray spectroscopy following inelastic neutron scattering. The decay characteristics of these levels have been determined from γ-ray excitation functions, angular distributions at En = 1.72, 2.80, and 3.35 MeV, Doppler shifts, and γγ coincidences. Electromagnetic transition rates were deduced for many levels, as were multipole-mixing and branching ratios. Level energies and electromagnetic transition rates were compared to interacting boson model (IBM) calculations, both with and without intruder-state mixing, and to particle-core coupling model calculations. The energies of low-lying levels of 122Te are well described by the IBM with intruder-state mixing calculations, and observed transition rates support emerging intruder bands built on 0+ levels. The other models considered do not produce enough low-lying positive parity states; however, U(5) energies to the four quadrupole-phonon level agree very well with observations when states with large intruder configurations are ignored. Mixed-symmetry and quadrupole-octupole excitations have been investigated, but mixing with other configurations and fragmentation of strength prohibit a clear identification of these states.

Original languageEnglish
Article number034307
JournalPhysical Review C - Nuclear Physics
Volume71
Issue number3
DOIs
StatePublished - Mar 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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