Seaborgium was obtained artificially by nuclear synthesis reaction. The great number of nucleons makes the nucleus instable, as a result of which a fission reaction may be initiated immediately after synthesizing. Seaborgium isotopes with mass numbers 259, 261, 263, 265 and 266 with different half-lives have been obtained. The 265Sg isotope has the biggest half-life equal to 21 s.
The first samples of Seaborgium had been synthesized via fusion of Californium-249 with Oxygen-18:
24998Cf + 188O -> 263106Sg + 41n
In Switzerland, at the Paul Scherrer Institute, the Seaborgium was synthesized by bombarding of Californium-248 by Neon:
24898Cf + 2210Ne -> 266106Sg + 41n |