A method for the calculation of isomer ratios in reactions in which the compound nucleus decays by the emission of a few particles followed by $\gamma$ emission is presented. It is shown that the calculated value of the isomer ratio is sensitive to the spin cutoff parameter, the amount of quadrupole admixture in the $\gamma$-ray cascade, and the presence of discrete levels. In most cases good agreement between experimentally measured and calculated values of isomer ratios is obtained.

• Received 6 July 1970

DOI:https://doi.org/10.1103/PhysRevC.3.447