Stringent tests of shell model calculations in fp shell nuclei 46,48Ti and 50,52Cr from measurements of g factors and B(E2) values

Measurements of magnetic moments and lifetimes of 2(1)(+) and 4(1)(+) states of Ti-46,Ti-48 and Cr-50,Cr-52 were performed with high accuracy via projectile Coulomb excitation and the technique of transient magnetic fields. The high quality of the data allows for the first time to establish stringent constraints on large scale shell model calculations. Whereas the global behavior of the data is well explained by full fp shell model calculations, distinct deviations in the g factors and B(E2) values of Ti-46,Ti-48 from theoretical predictions can be attributed to excitations of the Ca-40 core. This suggestion is supported by recent Monte Carlo calculations which provide evidence that Ca-48 is a better inert core.