An optical pumping apparatus has been attached to the reconstructed ISOLDE on-line mass separator at CERN in order to obtain nuclear data of isotopes far from fi stability. As first results the spins of 76Rb (T1/2= 36.8 s) and 119Cs (Ti/2 = 37.7 s) have been determined by/3 radiation detected optical pumping (/3-RADOP) to be I = 1 and I= 9/2 respectively.
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