Raymond A. Dewberry

Nuclear levels in166Ho: Evidence for a large configuration mixing

Fifty-six levels in166Ho have been observed up to an excitation energy of 2,000 keV using the167Er(t,α)166Ho reaction with 17.0-MeV tritons. An anomalously small spectroscopic factor for the states in the [411↑±633↑] configuration has been observed, which has been interpreted as evidence for a large amount of configuration mixing with the states in the [523↑±521↑] configuration. Residual interaction calculations with a finite range central force have failed to account for the large configuration mixing observed. New assignments for 29 rotational states have been proposed. An anomalous singlet-triplet splitting is observed in the [404↓±633↑] configuration.