HIGH-SPIN STATES IN SC-45 AND COEXISTENCE OF COLLECTIVE AND NONCOLLECTIVE STRUCTURES IN THE ODD-A F(7 2) NUCLEI/

High-spin states in Ca-43, Sc-45, and Ti-45 were studied with the GASP multidetector array coupled with the Recoil Mass Spectrometer. The nu clei were excited in the 60 MeV O-18 + Si-30 reaction. Lifetimes were extracted from the analysis of the Doppler-shift attenuation of gamma- rays observed in the reversed Cl-35 + C-12 reaction. The Lifetimes, B( MI) and B(E2) values for Sc-45 are presented. The measurements suggest significant deformation of the positive-parity intruder band in this nucleus. The band is predicted by the mean-field calculations to be th e cross-shell particle-hole excitation associated with a strong quadru pole core-polarization. Spherical shell-model calculations reproduce o bserved excitation energies and transition rates in both spherical and deformed structures.