Paul trapping of radioactive 6He+ions and direct observation of their   beta-decay
  We demonstrate that abundant quantities of short-lived beta unstable ions can be trapped in a novel transparent Paul trap and that their decay products can directly be detected in coincidence. Low energy 6He+ (807 ms half-life) ions were extracted from the SPIRAL source at GANIL, then decelerated, cooled and bunched by means of the buffer gas cooling technique. More than 10^8 ions have been stored over a measuring period of six days and about 10^5 decay coincidences between the beta particles and the 6Li^{++} recoiling ions have been recorded. The technique can be extended to other short-lived species, opening new possibilities for trap assisted decay experiments. 
X. Flechard (1), E. Lienard (1), A. Mery (1), D. Rodriguez (1), G. Ban   (1), D. Durand (1), F. Duval (1), M. Herbane (1), M...