Reaction Mn-55+Tb-159 : preparation for the synthesis of new elements

The complete fusion reaction of Mn-55 + Tb-159 was studied on the gas-filled recoil separator SHANS2.Nineteen ER - alpha(1) - alpha(2) decay chains from Th-210 produced from the 4n evaporation channel were observed. The alpha-particle energy and half-life of Th-210 were determined as 7922(14) keV and 14(4) ms, respectively. In addition, the decay properties of E-alpha= 7788(14) keV and T-1/2 = 36(-8)(+15) ms were obtained for Th-211. The measured alpha decay properties of Th-211 and Th-211 were consistent with literature data. The cross sections were measured to be 0.59(-0.23)(+0.25) nb and 0.19-(+0.12)(0.09) nb for Th-210 and Th-211, respectively. The equilibrium charge state of the recoiled nucleus Th-210 was determined experimentally. The new data were helpful for estimating the equilibrium charge states of elements 119 and 120, which could be produced via the Pu-240(Mn-55, 3n)(292) and Am-243(Mn-55, 3n)(295)120 reactions, respectively