Abstract
An empirical rule for the sign of the Newby shifts inK=0 rotational bands from purej-shells is proposed. An examination of 42 experimentalK=0 bands demonstrates the usefulness of this rule. A fit of the parameters in the residual neutron-proton interaction to the experimental Newby shifts shows the importance of the space exchange term for a good description of the Newby shifts.
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The Swedish Research Council is gratefully acknowledged for a grant, giving me the possibility to visit Institut Sciences Nucléaires, Grenoble, and be stimulated by the good working conditions and the hospitality there. I am also indebted to French CNRS for financial support. Encouragement from J. Kern, R. Pipenbring and R.K. Sheline is also appreciated.