Abstract
A plunger system for measuring mean lives τ and g-factors of excited nuclear states with τ⋍1−100 ps is described. The plunger distance is adjustable over a range of 25 mm by a fully piezo-electrically controlled “inchworm”. The actual distance measurement is performed by a laser-interferometer system and by measuring the plunger capacity. Test experiments on the mean lives of 21 Ne( 5 2 1 +) and 25 Mg( 3 2 1 +) show that the performance of the system is satisfactory.
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