Eur. Phys. J. A (2004) 21: 243-255
https://doi.org/10.1140/epja/i2003-10204-2

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

^* e-mail: sarah.dean@fys.kuleuven.ac.be

Abstract

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.