Nuclear structure apects in a approximately 90

A systematic review of the experimental studies on some neutron deficient nuclei in the A approximately 90 region performed at the Bucharest FN tandem is presented. After a brief account of the measurements, several transitionality aspects are evidenced, like a change of structure in the odd Sr isotopes from N = 48 to N = 46 and the occurence of decoupled g 9/2 bands. The description of these characteristics is discussed in connection with the triaxial rotor, with the VMI model, as well as the cluster-vibration and the interacting boson-fermion model. A systematics of the B(E2) values for the 81+ state in the N = 46 isotones is also presented. (authors)