“…Thus, for Zn ionization with the RILIS, the most serious background will be Rb and, to less degree also Ga and Sr. In the mentioned decay spectroscopy experiments either selective detection methods (beta-delayed neutrons in [2]) and/ or an identification via the time behaviour or ''laser on"/ ''laser off" differences respectively and a removal of longlived background by a tape system [3,4] were employed. However, new applications of RIBs include direct precision mass measurements with a Penning trap and experiments with post-accelerated beams like e.g.…”