Shape-driving effects in the triaxial nucleus, 128Xe
Orce, J.N., Bruce, A.M., Emmanouilidis, A., Byrne, A.P., Dracoulis, G.D., Kibédi, T., Caamaño, M., El-Masri, H., Pearson, C.J., Podolyák, Zs., Stevenson, P.D., Walker, P.M., Xu, F.R., Cullen, D.M. and Wheldon, C. (2006) Shape-driving effects in the triaxial nucleus, 128Xe Physical Review C, 74 (3). ISSN 0556-2813
An extended decay scheme for 128Xe has been constructed by using data from the 124Sn(9Be, 5n)128Xe reaction at a beam energy of 58 MeV. Bands have been identified as being built on several intrinsic states, including a proposed 9/2- [direct-product]1/2+ two-quasineutron configuration that forms the Kpi=5- intrinsic state at 2228 keV, and on a previously assigned Kpi=8- intrinsic state at 2786 keV. A half-life of 73(3) ns has been measured for the latter. Theoretical calculations have been performed by using the configuration-constrained blocking method based on a nonaxial Woods-Saxon potential. Large gamma deformation and gamma softness are predicted for the ground state and the Kpi=5- intrinsic state, whereas a nearly axially symmetric shape is predicted for the Kpi=8- two-quasiparticle configuration. The low value of the hindrance factor for the E1 transition depopulating the Kpi=8- intrinsic state is discussed in the context of analogous transitions in neighbouring N=74 isotones.
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