Delayed Neutron Emission fromI137

The $\beta$-delayed neutron energy spectrum from ${}_{}{}^{137}{}_{}{}^{}\mathrm{I}$ has been studied with a high-resolution neutron spectrometer. The neutron energy distribution is found to exhibit prominent line structure. The overall shape of the distribution indicates that $\gamma$-ray emission strongly competes with $d$-wave neutron emission over a large excitation energy interval. The line structure is shown to be in general agreement with spin-dependent level-density calculations.