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arXiv · hep-ex/9412008

Study of a Threshold Cherenkov Counter Based on Silica Aerogels with Low Refractive Indices

I. Adachi et al
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Abstract

To identify $π^{\pm}$ and $K^{\pm}$ in the region of $1.0\sim 2.5$ GeV/c, a threshold Cherenkov counter equipped with silica aerogels has been investigated. Silica aerogels with a low refractive index of 1.013 have been successfully produced using a new technique. By making use of these aerogels as radiators, we have constructed a Cherenkov counter and have checked its properties in a test beam. The obtained results have demonstrated that our aerogel was transparent enough to make up for loss of the Cherenkov photon yield due to a low refractive index. Various configurations for the photon collection system and some types of photomultipliers, such as the fine-mesh type, for a read out were also tested. From these studies, our design of a Cherenkov counter dedicated to $π/ K$ separation up to a few GeV/c %in the momentum range of $1.0 \sim 2.5$ GeV/c with an efficiency greater than $90$ \% was considered.

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I. Adachi et al. 1994-12-13. Study of a Threshold Cherenkov Counter Based on Silica Aerogels with Low Refractive Indices. https://doi.org/10.1016/0168-9002(94)01119-2

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