This element, Pu, was first detected in a cyclotron at Berkely in 1940
... With 
Benjamin S. Loeb he wrote a historical series, the first of which was... [DOC] [TLE] Discovery of Transuranium Elements at Berkeley Lab [PAR] Neptunium, the first element beyond uranium, was created by capture of slow 
neutrons ... Synthesis of new elements at Berkeley Lab began with the discovery 
of neptunium ...