Electromagnetic showers as seen by a streamer tube presampler

Abstract

Streamer tubes with graphited walls and external pick up strip electrodes have been used to study the localization and the spread of electromagnetic showers following compact or distributed converters of up to two radiation lengths of materials. Comparing the strip distributions for different conditions, we find no deterioration, neither in the positioning nor in the resolving power with respect to minimum ionizing particles traversing no material.