At Los Alamos he headed F Division, part of which worked on Edward Teller's thermonuclear Trinity test on 16 July 1945, where he used his Fermi method to estimate the bomb's yield.
He headed F Division, part of which worked on Edward Teller's thermonuclear Trinity test on 16 July 1945, where he used his Fermi method to estimate the bomb's yield. This was at Los Alamos.