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We describe a novel photon detector which operates under an intense flux ofneutrons. It is composed of lead-aerogel sandwich counter modules. Its salientfeatures are high photon detection efficiency and blindness to neutrons. As aresult of Monte Carlo (MC) simulations, the efficiency for photons with theenergy larger than 1 GeV is expected to be higher than 99.5% and that for 2GeV/$c$ neutrons less than 1%. The performance on the photon detection undersuch a large flux of neutrons was measured for a part of the detector. It wasconfirmed that the efficiency to photons with the energy $>$1 GeV wasconsistent with the MC expectation within 8.2% uncertainty.

An aerogel Cherenkov detector for multi-GeV photon detection with low sensitivity to neutrons