Author/Authors :
Mineev، نويسنده , , O and Garber، نويسنده , , E and Frank، نويسنده , , J and Ivashkin، نويسنده , , A and Kettell، نويسنده , , S and Khabibullin، نويسنده , , M and Kudenko، نويسنده , , Yu and Li، نويسنده , , K and Littenberg، نويسنده , , L.S. and Mayatski، نويسنده , , V and Yershov، نويسنده , , N، نويسنده ,
Abstract :
A photon detector for BNL experiment E949 is described. The detector consists of a lead scintillator “sandwich” of 25 layers of 5 mm thick scintillator BC404 and 24 layers of 2 mm lead absorber. Readout is implemented with 30–60 cm long wavelength shifting (WLS) fibers (BCF 99-29AA) glued into grooves in the BC404. Average yield was measured with cosmic rays to be about 43 p.e./MeV. Performance of extruded plastic scintillation counters developed for sandwich detectors of photons for the KOPIO experiment are also described. For a 7 mm thick counter with 4.3 m long WLS fibers spaced at 7 mm, a light yield of 18.7 p.e./MeV and time resolution of 0.71 ns were obtained. A prototype photon veto module consisting of 10 layers of 7 mm thick extruded plastic slabs interleaved with 1 mm lead sheets was tested.
