Synthesis of Heaviest Elements Using a Gas-Filled Recoil Separator at Riken

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Using heavy-ion fuision reactions with one neutron evaporation, production and decay of isotopes of the heaviest elements with atomic numbers 108, 110, 111, 112, and 113, were studied. The reactions used were 208Pb(58Fe, n), 208Pb(64Ni, n), 209Bi(64Ni, n), 208Pb(70Zn, n), and 209Bi(70Zn, n), respectively. A gas-filled recoil separator was used to separate the isotopes of our interest from the primary beams from the accelerator, and from the other background particles. Our results clearly confirmed the productions of 265Hs, 271Ds, 271Rg (Z=111), and 277112 reported previously by a GSI group. The convincing candidate event of the isotope of the 113th element, 278113, and its daughter nuclei, 274Rg and 270Mt were observed for the first time.

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