Abstract

The four new neutron deficient isotopes246Md (T1/2=(1.0±0.4) s),245Md (T1/2=(0.35 −0.16 +0.23 ) s),242Es (T1/2=(16 −4 +6 ) s) and241Es(T1/2=(8 −4 +6 ) s) were produced in fusion reactions of40Ar ions with209Bi targets at bombarding energies of E p =4.78, 4.93 and 5.12 A*MeV. The assignment was based on evaporation residue-α-α time and position correlations. A spontaneous fission activity of T1/2=(0.90±0.25) ms was observed at a projectile energy of E p =5.12 A*MeV and assigned to245Md.

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