A gas ionization counter for particle identification

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Abstract

A method is described for the identification of products from nuclear reactions. A gas ionization counter is used as a thin (0.8 mg/cm2) transmission detector in a counter telescope particle-identification system. The response of the system is approximately linear in Z for the ions produced by heavy-ion-induced fission of medium-Z targets. Reaction products with Z up to ∽ 30 can be well resolved.

Methods of fabrication of entrance windows for the counter are discussed and a procedure for determination of the window thickness is presented. Generally entrance windows were either Formvar or VYNS with a thickness of 40–60μg/cm2.

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