212Pb (Th B ) as a time calibration standardfor delayed coincidence measurements.

The lifetimes of the excited states in 133Cs have been measured by the delayed coincidence technique. The results are:The 81.0 keV level: T½ = 6.27 ± 0.04 nsThe 160.5 keV level: T½ = 190 ± 15 psThe 384 keV level: T½ = 40 ± 20 psThe 437 keV level: T½ ⩽ 150 psA comparison is made between experimental and theoretical transition probabilities. The 160 keV state is interpreted as a three quasi particle state.

The probability for K-conversion of the 35 keV M1 + E2 transition is determined from coincidences between Auger electrons and conversion electrons. The result is χ K =0.804±0.010.

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Half-lives of the 181.8 keV level (1.91 ± 0.06 ns) and the 477.9 keV level (68 ± 16 ps) have been measured by the delayed coincidence technique. Upper limits for the half-lives of two levels in 101Ru are reported.