Electronic measurements of nuclear lifetimes in the region 1 ps < τ < 100 ps

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A system is desribed which measures electronically lifetimes of excited nuclear states of radioactive probes in the region 1 ps < τ < 100 ps. The principle of the centroid-shift self-comparison method is applied. The technique which is developed allows to control all systematic errors to better than 0.2 ps in favourable cases. The half-lives of the first excited states of 60Ni and 46Ti were measured as t 1 2 (2 + state of 60 Ni) = (0.90±0. ps , and t 1 2 (2 + state of 46 Ti) = (4.65±0.35) ps .