Shell Model Configurations in the 2 + 1 State in 46 Ca from a g-factor Measurement

Abstract

The g factor of the first excited 21+ state in 46Ca has been remeasured with better accuracy than previously obtained, g(21+, 46Ca) = -0.26(6). The experiment utilized the transient field technique combined with Coulomb excitation in inverse kinematics. This result was analyzed in terms of shell model plus deformed core calculations. The positive g factors of the 2 1+ states in Ca and Ca suggest that the 21+ state wave functions require significant particle-hole excitations of the Z = 20, N = 20 core. The new data for 46Ca show that (fp) ν6 configurations dominate near the shell closure at 48Ca and indicate that core excitation plays a lesser role than was hitherto believed. Show more