Synthesis of several isotopes of fermium and determination of their radioactive properties

Evidence of Complete Fusion in the Sub-BarrierO16+U238Reaction

“…In the analysis, the branching ratio of the decay was used as 0.95 ( 250 Fm), 0.15 ( 249 Fm), and 0.99 ( 248 Fm) [18]. Our data are close to those of [14] in the absolute values and the E c:m: values corresponding to the maximum cross sections for each xn channels. The 4n-channel cross section in Ref.…”

“…For the 16 [14], whereas the data in [15] gives the maximum at 86 MeV and the cross section drops below this energy. The different conclusions are derived in the sub-barrier region, necessitating further measurement.…”

Discovery of isotopes with Z≤10

“…Alphaparticles emitted from the recoils were measured. No further details about the experimental setup were given referring to a preprint [30]. "By comparing the illustrated excitation functions of reactions leading to the formation of α-emitters with 8.08, 8.23, and 8.…”

Rapid Chemical Separations

“…Helium was superior to argon as the stopping medium but argon was employed occasionally (67) . An admixture of 1 per cent air to the helium reduced the collection efficiency of rare earths by a factor of two (50) but increased that of astatine by an order of magnitude (68 example, sequential counting of the activity with several solid-state detec tors (69) , or operation inside a cyclotron chamber (70,71). Construction details may be seen in these and other publications (72-74).…”