Oblate L=1 bands in 194,196-201Pb and 193Hg

J. A. Becker, E. A. Henry, A. Kuhnert, M. A. Stoyer, M. J. Brinkman, T. F. Wang, N. Roy, Jolie Cizewski, F. S. Stephens, M. A. Deleplanque, R. M. Diamond, J. R.B. Oliveira, J. E. Draper, F. Azaiez, A. O. Macchiavelli, W. Korten, E. Rubel, C. Duyar, W. H. Kelly, D. Vo

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Abstract

Reports of recent experiments have included observations of regular and irregular bands in neutron deficient Pb isotopes with A=194, 196-201. The bands are populated strongly in (HI, xn) reactions. The shared characteristics of the bands include: 1) bandhead energies of a few MeV; 2) high bandhead spin; 3) large alignments; 4) small dynamic moments of inertia, and 5) strong L=1 transitions and weaker L=2 crossover transitions, with B(M1) B(E2) ≈ 20 μ2 e2b2. Lifetimes of band members in the 198Pb regular band are B(M1) ≈ 1 W.u. and B(E2) ≈ 12 W.u. (with large errors). These observations are consistent with an interpretation of the regular structures as collective oblate bands with both proton and neutron excitations involved; the closed proton shell at Z=82 is broken, and coupled to v(i 13 2)-n excitations. The irregular structures may correspond to triaxial shapes, with similar orbits involved. A similar structure has been also found in 193Hg.

Original languageEnglish (US)
Pages (from-to)313-317
Number of pages5
JournalNuclear Inst. and Methods in Physics Research, B
Volume79
Issue number1-4
DOIs
StatePublished - Jun 2 1993

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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