Weak coupling and dipole bands in [Formula Presented]

N. Fotiades, J. A. Cizewski, D. P. McNabb, K. Y. Ding, D. E. Archer, J. A. Becker, L. A. Bernstein, K. Hauschild, W. Younes, R. M. Clark, P. Fallon, I. Y. Lee, A. O. Macchiavelli, R. W. MacLeod

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Excited states in the nucleus [Formula Presented] have been investigated by in-beam γ-ray spectroscopic techniques using the Gammasphere array. The reaction [Formula Presented] at a beam energy of 134.5 MeV was used to populate states of [Formula Presented] The level scheme of [Formula Presented] has been extended up to 5.1 MeV excitation energy and spin [Formula Presented] The lower part (below [Formula Presented]) presents the general features common in all odd-mass Pb isotopes, i.e., spherical states built on the [Formula Presented] isomer, with bandlike structures that follow weak-coupling expectations. In the upper part of the level scheme two dipole bands are observed with bandhead energies of [Formula Presented] and 2.291 MeV. A comparison of dipole band 1 with the strongest negative-parity dipole bands in the heavier odd-mass Pb isotopes reveals striking similarities. The spherical states are interpreted as the coupling of the [Formula Presented] neutron hole to the yrast states in the even-mass [Formula Presented] core. The dipole bands are interpreted as [Formula Presented] cascades which arise from the coupling of two protons in high-[Formula Presented] orbitals above the [Formula Presented] gap to neutron holes in the [Formula Presented] orbital.

Original languageEnglish (US)
Pages (from-to)1624-1633
Number of pages10
JournalPhysical Review C - Nuclear Physics
Issue number4
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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