Comparative analysis of the 178m2Hf yield at reactions with different projectiles

The long-lived high-spin 178m2Hf K isomer can be produced in nuclear reactions with different projectiles. The reaction yields and cross sections have been measured in a series of experiments and the results are now reviewed. The systematics of isomer-to-ground-state ratios are drawn and real production capabilities are estimated for the best reactions. Such a summary is relevant to the significance of isomer studies, both for nuclear-science knowledge and for possible applications. Potential isomer applications have been stressed previously in popular publications with probably overestimated expectations. The real possibilities are restricted in part by the production yield and by other shortcomings as well.