K dependence in the gamma decay of neutron resonances in 168Er and 178Hf.

Abstract

The energy-corrected transition rates for \ensuremath{\gamma} decay of the n-capture states in $^{168}\mathrm{Er}$ and $^{178}\mathrm{Hf}$ are calculated from data available in the literature. If one assumes that the capture states have good K values, the data reveal a significantly lower average transition rate when the normal K-selection rules are broken than for K-allowed transitions. The effect is more profound in the data from thermal neutron capture than in the data from 2 keV neutron capture.