The beta decay of neutron-deficient rhodium and ruthenium isotopes
Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001, Leuven, Belgium
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The very neutron-deficient 91,92,93Rh and 90,91Ru nuclei were produced in 58Ni(36,40Ar, xn yp) fusion-evaporation reactions. Reaction products leaving the target were stopped in a gas cell and selectively laser ionised before mass separation using the LISOL setup. Data were collected in singles and coincidence formats to investigate -delayed and isomeric decays. Ground-state decays of 91,93 Rh to excited states in the daughter nucleus were identified for the first time and the decay schemes of 90,91 Ru were expanded. The low-spin isomeric decay of 92Rh was identified for the first time and detail added to the decay scheme of the known high-spin state. Results are discussed in terms of comparison with shell model calculations. -delayed proton activity in the lighter 90Rh and 89Ru isotopes was also investigated and upper limits for this decay mode in these two nuclei have been included.
© Società Italiana di Fisica and Springer-Verlag, 2004