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The decays of strongly neutron rich isotopes of Zn have been studied with the primary aim of nuclear mass determinations. The work has also resulted in considerable information on the previously practically unknown level structure of 75,76,77,79,80Ga. Improved Qβ-values are obtained for 75,76,77,78Zn and 76,78,80Ga. The Qβ-values of 79,80Zn are reported for the first time. The experimental results are compared with predicted values of nuclear masses.

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A comprehensive study has been carried out of the yield pattern of fission products formed in thermal neutron-induced fission of 235 U. An isotope separator on-line a nuclear reactor was used for rapid separation of the fission products. At a target temperature of 2400 Q C all fission elements, with the exception of the little volatile transition elements zirconium, niobium, molybdenum, technetium, ruthenium, and rhodium, are released. Their isotopes are then available for study which means that a very complete mapping of the yield distribution is within reach. In the analysis the delay between production and measurement and the overall separator efficiency for three consecutive elements -the one under study and its parent and grandparentare taken into account. Independent and/or cumulative yields have been obtained for 195 nuclear species, among them 83 isomeric states.

The decay of ~3SSb has been investigated at the online fission product mass separator OSIRIS. The low energy level scheme of the daughter nucleus 135Te, revealing states of strong single-particle character. The results are compared to experimental data for isotonic nuclei, and are discussed within the framework of the shell-model. PACS: 23.20.Lv; 25.85.Ec