A large solid angle electron detector with very low sensitivity to γ-rays

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Abstract

A large solid angle detector consisting of a hin crystal of anthracene coupled to a fast photomultiplier by an air-filled light guide has been designed and constructed for use in experiments which require the detection of electrons of positrons from the internal pair decay of excited nuclear levels in coincidence with nuclear reaction products. The primary design considerations were high efficiency for electrons and low sensitivity to γ rays. In tests involving the first excited 0+ state of 16O an efficiency of (31.9 ± 0.6)% was observed; γ rays from the nearby second excited state were detected with a sensitivity approximately 100 times smaller.

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Cited by (5)

This project has benefited considerably from suggestions by Prof. R.W. Zurmühle. We are indebted to Prof. T. Chapuran for assistance in making the final efficiency measurements; D.P. Bybell and C.M. Laymon have also provided valuable experimental assistance during various phases of this work. Finally, we are indebted to R. Schiff for valuable help in calculating the theoretical detector efficiency. This work was supported by the National Science Foundation.

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