Weak coupling and dipole bands in 191Pb

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, and R. W. MacLeod
Phys. Rev. C 57, 1624 – Published 1 April 1998
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Abstract

Excited states in the nucleus 191Pb have been investigated by in-beam γ-ray spectroscopic techniques using the Gammasphere array. The reaction 173Yb(24Mg,6n) at a beam energy of 134.5 MeV was used to populate states of 191Pb. The level scheme of 191Pb has been extended up to 5.1 MeV excitation energy and spin 45/2. The lower part (below 2.3MeV) presents the general features common in all odd-mass Pb isotopes, i.e., spherical states built on the 13/2+ 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 2.512 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 i13/2 neutron hole to the yrast states in the even-mass 192Pb core. The dipole bands are interpreted as M1 cascades which arise from the coupling of two protons in high-j orbitals above the Z=82 gap to neutron holes in the i13/2 orbital.

  • Received 10 November 1997

DOI:https://doi.org/10.1103/PhysRevC.57.1624

©1998 American Physical Society

Authors & Affiliations

N. Fotiades1, J. A. Cizewski1, D. P. McNabb1, K. Y. Ding1, D. E. Archer2, J. A. Becker2, L. A. Bernstein2, K. Hauschild2, W. Younes2, R. M. Clark3, P. Fallon3, I. Y. Lee3, A. O. Macchiavelli3, and R. W. MacLeod3

  • 1Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903
  • 2Lawrence Livermore National Laboratory, Livermore, California 94550
  • 3Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

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Vol. 57, Iss. 4 — April 1998

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