2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81181A two-step reaction scheme for the production of extremely neutron-rich radioactive beams, fission followed by cold fragmentation, is considered. The cross sections of the second step, the cold fragmentation of neutron-rich fission fragments, are estimated with different computer codes. Discrepancies between an empirical systematics and nuclear-reaction codes are found.31 pages, 13 figures, background information on http://www-wnt.gsi.de/kschmidt/Nuclear Experimenttext