Testing calorimeter prototypes improves energy resolution with low energy photons, highlighting design effectiveness.
In this work we report the complete set of measurements carried out at LADON on small size calorimeter modules composed of a uniform array of plastic scintillating fibers and lead (50:35 by volume ratio) for photons in the energy range 20-80 MeV. Calorimeter properties for both head-on and side-on incidence conditions have been investigated. With photons hitting the fibers laterally, an energy resolution of 4.8%/\√E[GeV] is obtained. This figure includes a 2%/\√E[GeV] term added in quadrature due to the photoelectron statistics.
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D' et al. (1993) studied this question.
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