Acta Physica Polonica B

Vol. 32, No. 3, March 2001, page 957

Octupole Correlations and Deformation in Ba, La and Pr

J.H. Hamilton, Y.X. Luo, J.K. Hwang, E.F. Jones, A.V. Ramayya, S.H. Zhu, P.M. Gore, C.J. Beyer, J. Kormicki, X.Q. Zhang, T.N. Ginter, M.G. Wang, J.D. Cole, M.W. Drigert, W.C. Ma, P.G. Varmette, G.M. Ter-Akopian, Yu.Ts. Oganessian, A.V. Daniel, J. Kliman, J.O. Rasmussen, I.Y. Lee, R. Donangelo, A.P. de Lima

Stable octupole deformation was predicted and subsequently found to occur centered around the reinforcing shell gaps at Z=56 and N=88 for \noindent \beta 3 \simeq 0.15. Evidence for stable octupole deformation is reviewed. New results in 145Ba and 141Ba are presented. Rotational enhancement of octupole deformation is found at intermittent spins in Ba and La nuclei and the quenching of such deformation at higher spins in 146Ba but not in 144Ba. Symmetric and asymmetric shapes coexist in 145Ba and 145La. Evidence for octupole correlation is found in 147Pr but only h11/2 bands are found in 149,151Pr. The new 141Ba levels have two sets of two intertwined bands of levels with the characteristics of octupole deformation as found in 143,145Ba, however, a problem occurs with the assignment of parities in 141Ba.

PACS numbers: 21.60.--n, 27.60.+j, 25.85.Ca, 21.20.Hw

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