STUDIES OF SOME ISOMERIC YIELD RATIOS PRODUCED WITH BREMSSTRAHLUNG

The experimental isomeric ratios for Mn-52mg, Y-86mg, Zr-87mg, Zr-89mg , In-111mg, In-112mg, In-112mg, Pm-152mg, Eu-152m2ml, Ho-162mg, Ho-164 mg and Lu-178mg measured by the activation technique from different ta rgets in (gamma, xnp) reactions (x less than or equal to 3) at the bre msstrahlung end-point energy of 43 MeV are presented. The predictions of calculations performed by means of compound nucleus particle evapor ation and final gamma-deexcitation were critically discussed. The impo rtance of inclusion in the calculations of nonequilibrium particle emi ssion and an adequate gamma-decay mode of isomeric nuclei was consider ed for some of the reactions investigated. (C) 1998 Elsevier Science L td. All rights reserved.