Isomeric ratios for ^{196,198}{\rm Tl} and ^{196,198}{\rm Au} from fusion and transfer in the interaction of ⁶He with ¹⁹⁷Au

Abstract

Excitation functions and isomeric cross-section ratios have been measured for the isomeric pairs 198m,gTl, 196m,gTl, 198m,gAu and 196m,gAu, formed in fusion–evaporation and transfer processes in reactions of 6He with 197Au in the energy range 7–60 MeV. The population probability of high- and low-spin states in the fusion reaction with the formation of 198Tl and 196Tl (Jπm = 7+, Jπg = 2−), as well as of the transfer products 198Au and 196Au (Jπm = 12−, Jπg = 2−) is compared with calculations within the statistical model and with similar results, obtained in reactions induced by other nuclei.