States up to Iπ=(20+) have been established in the neutron-deficient Gd140 nucleus by means of the Mo92(50Cr, 2pγ) reaction. At a rotational frequency Latin small letter h with strokeω=0.30 MeV, the ground-state band is crossed by a band built on the aligned [πh11/2]2 two-quasiproton configuration. This proton-aligned band was observed from spins 10+ to (20+). A second 10+ state was established which is most likely built on the [νh11/2]2 two-quasineutron configuration. The γ-vibrational band was observed up to Iπ=(8+) with the odd- and even-spin members exhibiting a pronounced signature splitting. The results are compared to those found recently for the lighter Nd136 and Sm138 N=76 isotones.
ASJC Scopus subject areas
- Nuclear and High Energy Physics