Abstract

The lack of systematic band crossings at high spin in /sup 159,160/Er and the selectivity of the single observed neutron band crossing at (h/2..pi..)..omega..>0.37 MeV in /sup 159/Er (i) indicate that static neutron-pair correlations are too weak for the excitation of a pair of quasineutrons, and (ii) can be explained in terms of the expected spectrum of single-neutron states in the absence of static pair correlations.

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