High-spin spectroscopy of Ce139
Résumé
High-spin states in Ce139 have been populated using the Te130(C14,5n) reaction. The level scheme has been extended to higher spins, including a new band of dipole transitions. The parity of several states has been changed from negative to positive, mainly based on the comparison with the level structure of the core nucleus Ce140 and the results of a realistic shell-model calculation. The dipole band is interpreted as a magnetic rotation band with πh211/2⊗νh−111/2 configuration built on small deformation axial shape with (ɛ2=0.12,γ=0∘).
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