Dominant g(9/2)² neutron configuration in the 4+1 state of 68Zn based on new g factor measurements

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The g factor of the 4₁+ state in ⁶⁸Zn has been remeasured with improved energy resolution of the detectors used. The value obtained is consistent with the previous result of a negative g factor thus confirming the dominant 0g₉/₂ neutron nature of the 4₁+ state. In addition, the accuracy of the g factors of the 2₁+, 2₂+ and 3₁- states has been improved an d their lifetimes were well reproduced. New large-scale shell model calculations based on a ⁵⁶Ni core and an 0f₅/₂1pg₉/₂ model space yield a theoretical value, g(4₁+) = +0.008. Although the calculated value is small, it cannot fully explain the experimental value, g(4₁+) = -0.37(17). The magnitude of the deduced B(E2) of the 4₁+ and 2₁+ transition is, however, rather well described. These results demonstrate again the importance of g factor measurements for nuclear structure determination s due to their specific sensitivity to detailed proton and neutron components in the nuclear wave functions.