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Evidence for prolate deformation in highly excited neutron-deficient Pb isotopes

1987; American Physical Society; Volume: 58; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.58.1092

1092-0145

D. R. Chakrabarty, M. Thoennessen, N. Alamanos, P. Paul, S. Sen,

Quantum Chromodynamics and Particle Interactions

We report the observation of the giant dipole resonance in Pb nuclei near A\ensuremath{\sim}200 at excitation energies of 66, 88, and 103 MeV and with average angular momenta of 25\ensuremath{\Elzxh} to 44\ensuremath{\Elzxh}. The fits to the dipole strength distribution require two components indicating a strongly deformed nuclear shape. Using width parameters consistent with the ground-state systematics of heavy deformed nuclei gives ${E}_{1}$=11.9 MeV, ${E}_{2}$apeq215.6 MeV, and prolate deformation with \ensuremath{\beta}apeq20.3. These results are compared with a prediction for superdeformed shapes in $^{196}\mathrm{Pb}$ at L=30\ensuremath{\Elzxh}.