Magnetic Moment of the Lowest 6+ State in 42Ca

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Abstract
The g -factor of the 3190 keV 6 + state in 42 Ca was measured by the time-differential perturbed-angular-distribution method in the 40 Ca(α,2 p ) 42 Ca reaction. The result is g =-(0.50 -0.03 +0.02 ). Assuming the 0.99f 7/2 2 +0.13f 7/2 f 5/2 configuration for the 6 + state, the magnetic moment for the 0f 7/2 neutron is deduced to be -1.99µ N , being very different from the known magnetic moment of the 41 Ca ground state. The strong violation of the additivity relation is interpreted by a larger mixing of the core-excited deformed states into the 41 Ca ground state. The above magnetic moment for the 0f 7/2 neutron supports recent proposal that the orbital g -factor is enhanced in nuclei by around 0.1 τ z if the quenching due to the second-order core polarization is taken into account.