A microwave method for lifetime measurements of nuclear states excited by α-particle decay

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Abstract

A method is described for measuring short lifetimes of converted γ-transitions fed by α-particle decay. A combination of a β-spectrometer and a microwave cavity is used for timing conversion electrons. The α-particles are timed with another hf cavity which modulates the energy of secondary electrons produced by the α-particles in a foil and accelerated up to 2 keV. The time resolution of the arrangement is about 50 ps. Methods of data analysis are discussed and the results of lifetime measurements of excited states in 219Rn and 207Tl are given.

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