Laser trapping of short-lived radioactive isotopes

We describe an experiment which demonstrates the feasibility of trapping significant quantities of short-lived radioactive atoms with laser light. A thermal beam of 22.5 sec half-life ${}_{}{}^{21}{}_{}{}^{}\mathrm{Na}$ atoms was produced on-line at the LBL 88’ ’ Cyclotron. After decelerating the beam using a Zeeman-tuned slowing technique we stored about 4×${10}^3$ ${}_{}{}^{21}{}_{}{}^{}\mathrm{Na}$ atoms in a magneto-optical trap. The number of trapped atoms is large enough to be used in experimental studies of the beta decay of ${}_{}{}^{21}{}_{}{}^{}\mathrm{Na}$. The basic method can be adapted for other rare isotopes.