The level structure of the transitional even-even Ce136 nucleus has been investigated using the Sn122(18O, 4n) reaction. The prominent structure observed at high spin is a I=1 rotational band, populated with 25% intensity of the 2+0+ transition, which has a low dynamic moment of inertia <20Latin small letter h with stroke2 MeV-1 for frequencies below Latin small letter h with stroke=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating =-60° oblate shape, and is related to the oblate h11/2[h11/2]2 configuration seen in several nearby odd-Z nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other I=2 bands, built on states including h11/2 quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band (<2% intensity), showing an enhanced dynamic moment of inertia 57Latin small letter h with stroke2 MeV-1, built on the highly deformed [i13/2]2 prolate configuration.
ASJC Scopus subject areas
- Nuclear and High Energy Physics