Abstract
The evaporation residues produced in heavy ion fusion reactions between40Ar and206Pb,208Pb, and209Bi, respectively, were investigated. They were separated in-flight using a velocity filter (SHIP) and identified after implantation into an array of position sensitive surface barrier detectors by measuring their decay characteristics. Three newα-emitting isotopes were found:247Md,243Fm, and239Cf.247Md was identified by correlation to its known daughter decay243Es, and243Fm and239Cf were observed as correlated decays. Moreover, all previously known deexcitation channels, characterized by spontaneous fission or byα decay, could be observed for the first time in one experimental setup. Our results for formation cross sections and decay characteristics are in agreement with known data.
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