Experiments on the synthesis of element 107
Oganesyan Yu.Ts., Demin A.G., Danilov N.A., Ivanov M.P., Il'inov A.S., Kolesnikov N.N., Markov B.M., Plotko V.M., Tret'yakova S.P., Flerov G.N.
Results are presented of experiments on the synthesis of the 107th element. Bombardment of 209Bi by S4Cr has revealed new spontaneously fissioning emitters with half-lives ~5 sec and ~2 msec. Different control experiments using the crossing-reaction method give grounds for assuming that activity with Tm ~5 sec is due to the spontaneous fission of the isotope 257 1 05, which is formed as a result of the α decay of the isotope 261107, which has a half-life of about 2 msec in a noticeable fraction of the events (~20%) and experiencing spontaenous fission.