<p> Fission-product bromine was isolated from a uranium target by the hot-atom reaction of the fission recoils with methane to form organic bromides. The organically-bound bromine was shown to be formed preferentially by primary (independently-formed) bromine with little contribution from secondary bromine. </p> <p> The delayed-neutron activity of the short-lived bromine isotopes was analyzed to obtain the relative yields of delayed neutrons from Br8?, Br88 and Br89 produced as primary fission products. The relative delayed-neutron yields are summarized below. (see abstract in text) </p> / Thesis / Doctor of Philosophy (PhD)