Synthesis of element 107
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Bohrium “…In the first experiments on the bombardment of 209Bi by 54Cr ions we observed a spontaneously fissioning emitter with an approximate half-life 5 sec. The results of experiments with the crossing reactions 209Bi + 54Cr, 208Pb + 55M and 205Tl + 58Fe have indicated that the yield of the observed activity exhibits the same regularities that can be expected when the 107th element is produced. |
…In the succeeding experiments the speed of the experimental procedure was greatly increased, and bombardment of 209Bi by 54Cr ions revealed a spontaneously fissioning emitter with T1/2 ~ 2 msec. The yield of this emitter correlated in all experiments with the yield of the long-lived activity with T1/2 ~ 5 sec, which can be regarded as the result of the spontaneous fission of the isotope 257105, produced after α decay of 261107…” |
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From “Experiments on the synthesis of element 107” Yu.Ts.Oganesyan, A.G.Demin, N.A.Danilov, M.P.Ivanov, A.S.Il’inov, N.N.Kolesnikov, B.N.Markov, Plotko V.M., S.P.Tretyakova and G.N.Flerov, JINR E7-9686 (1976)
“Experimental Studies of the Formation and Radioactive Decay of Isotopes with Z=104-109” Yu.Ts.Oganessian, M.Hussonnois, A.G.Demin, Yu.P.Kharitonov, H.Bruchertseifer, O.Constantinescu, Yu.S.Korotkin, S.P.Tretyakova, V.K.Utyonkov, I.V.Shirokovsky and J.Estevez, JINR E2-84-651 (1984), p.4-7
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