Abstract
The measured energy resolution of electrons and γ-rays detected in liquid argon ionization chambers is about an order of magnitude worse than the prediction based on the calculated Fano factor. It is suggested that along the path of an ionizing particle low energy δ-rays are copiously produced. They ionize the argon much more strongly than the primary electron, and the liberated charges experience a correspondingly higher recombination rate. The loss of ionization electrons from these δ-rays causes fluctuations in the detectable signal, which dominate the observed energy resolution. Measurements with a liquid argon filled gridded ionization chamber are presented that support this assumption.
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