Coexistence of collective and non-collective structures in the odd-A f(sub 7/2) nuclei

摘要

High-spin states in (sup 43)Ca, (sup 45)Sc, and (sup 45)Ti were studied with the GASP multidetector array coupled with the Recoil Mass Spectrometer. The nuclei were excited in the 60 MeV (sup 18)O +(sup 30)Si reaction. Lifetimes were extracted from the analysis of the Doppler-shift attenuation of (gamma)- rays observed in the reversed (sup 35)Cl+(sup 12)C reaction. The measurements suggest significant deformations of the positive-parity intruder bands in (sup 45)Sc and (sup 45)Ti. These bands are predicted by the mean-field calculations to be the cross-shell particle-hole excitation associated with a strong quadrupole core-polarization. Spherical shell-model calculations reproduce observed excitation energies and transition rates in both spherical and deformed structures. (author) 24 refs, 3 figs, 1 tab