The element was first synthesized in 1950 at the Lawrence Berkeley National Laboratory (then the University of California Radiation Laboratory), by bombarding curium with alpha particles (helium-4 ions).
Datu puniki kapertama kasintesis warsa 1950 ring Laboratorium Nasional Lawrence Bérkléy (selanturné Laboratorium Radiasi Universitas California), antuk ngabombardir kurium antuk partikel alpha (ion hélium-4).