Yields of neutron-rich rubidium and cesium isotopes from fast-neutron induced fission of $^{238}$U, obtained by studying their release from a thick ISOL target

In the framework of the EURISOL project, the production of neutron-rich isotopes of rubidium and cesium has been studied. The intensities of mass-separated beams of rubidium and cesium isotopes generated from a thick 238UCx target connected to a surface ionizer have been measured. The release properties of 140Cs and 91Rb have been investigated. The obtained results allowed us to determine the relative fission yields of rubidium and cesium isotopes with high accuracy