Collectivity and single-particle degrees of freedom: Studies of light f7/2 nuclei at EUROBALL IV and recoil filter detector.

Intruder rotational bands in ⁴⁵Sc and ⁴⁵Ti have been investigated up to the maximum aligned angular momentum by means of EUROBALL IV and the Recoil Filter Detector (RED). The use of the RED allowed for a reduction of the γ-line Doppler broadening and, moreover, for a determination of very short level lifetimes. In the studied nuclei, the estimated deformation shows a gradual disappearance of the collectivity at the highest available spins. [ABSTRACT FROM AUTHOR]