Abstract
The magnetic dipole response of N=28 isotones is obtained for 48 Ca, 50 Ti, 52 Cr and 54 Fe by means of shell model calculations in the full pf-shell. Spin quenching factors derived in all four nuclei by comparison to experimental strengths from electron scattering agree well with each other. The deduced effective g-factor g s eff =0.75(2) g s free is consistent with findings for the Gamow-Teller strength in this mass region. The ability of state-of-the-art shell-model calculations to describe the gross properties and the fragmentation of the complex experimental B( M1) strength distributions is investigated.
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