Abstract
The gas-filled separator JOSEF at the reactor FRJ-2 of the nuclear research centre Jülich has been in use since 1973 for nuclear spectroscopic investigations on neutron-rich nuclei produced through the fission of 235U, Sr-, Y- and Zr-isotopes in the light fission product group and Ba-, La-, Ce-, Pr- isotopes in the heavy group have been studied. Detailed measurements on the focusing and dispersive properties of the separator have been performed in order to obtain information on its characteristics. Of special interest was the dependence of the mass and nuclear charge dispersion on different gas-fillings. It will be shown, that an unambiguous identification of unknown emitters is possible. Further possibilities to improve the separation are discussed.
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