Abstract
Ion beams of many isotopes of Rb, Cs, Ba, Fr, and Ra have been produced at the ISOLDE facility, CERN, by bombarding heavy element targets with 600 MeV protons, followed by on-line surface ionization and electromagnetic mass separation. Overall production yields are reported, and the prospects for measuring formation cross-sections of short-lived nuclear species are discussed, taking the production of Cs from La as an example. The following half-lives of new nucleides have been determined: 75 Rb (21±3) sec, 76 Rb (36·8±1·5) sec, 116 Cs (3·6±0·2) sec, 136m Cs (19±2) sec, 227 Fr (2·4±0·2) min, 228 Fr (39±1) sec, 229 Fr(50±20) sec, 229Ra (4·0±0·2) min. The systematics of average beta ( β + , EC) strength functions has been updated.
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