(ALPHA,3PXN) OR (ALPHA,ALPHA-PXN) REACTIONS ON NATURAL DYSPROSIUM

Excitation functions for the production of Tb-155, (156(m1+m2+g))Tb, T b-160 and Tb-161 by (alpha,3pxn) reactions on natural dysprosium were experimentally determined by the method of activation of stacked metal lic foils. The irradiations were performed in the external beam of the isochronous cyclotron at Karlsruhe (Germany) with alpha-particles up to 88.5 MeV. Gamma-rays spectrometry with an n-type intrinsic coaxial Ge detector was used to determine the reaction product activities. The data are compared with theoretical predictions provided by equilibriu m and pre-equilibrium reaction models. Thick target yields for the pro duction of Tb-155, (156(m1+m2)+g))Tb, Tb-160 and Tb-161 are presented.