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Slow or trapped RI-beams from projectile fragment separators and their laser spectroscopy

A new idea to obtain slow or trapped unstable nuclear ions which are primarily produced by a projectile fragment separator is presented. The energetic unstable nuclear ion beams are, firstly, degraded by an energy degrader, then, injected into an RF ion-guide gas cell. A certain fraction of ions are thermalized in the gas cell as singly charged ions. They are rapidly and efficiently transported to an exit by DC and RF electric field. An off-line test experiment for the RF ion-guide is briefly described.