Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 47: Instrumentation V, Detector Systems

HK 47.10: Vortrag

Mittwoch, 18. März 1998, 16:45–17:00, A

Detection of Photons Between 50 and 790 MeV With a PbWO₄-Scintillator Array¹⁾ — •K. Mengel¹, W. D"oring¹, K. Metag¹, V. Novotny¹, R. Beck², and H. Str"oher² — ¹II.Physikalisches Institut, Heinrich Buff Ring 16, 35392 Giessen — ²Institut f"ur Kernphysik, Joachim Becher Weg 33, 55128 Mainz

The performance and applicability of PbWO₄ as a fast scintillator material in the energy regime below 1 GeV has been investigated at MAMI using tagged photons down to energies as low as E_γ = 50 MeV. A matrix consisting of 25 crystals (20x20x150-200mm³) provided by suppliers from China and Russia was used to determine the response function of the electromagnetic shower at 15 different discrete energies up to 790 MeV. The scintillators were individually read-out by photomultiplier tubes and operated at a temperature stabilized at T = 8⁰C. Excellent energy (σ/E=1.54%/√E[GeV] + 0.30%) and time resolution (σ_t=130 ps) have been achieved and will be compared to results obtained for electrons and to similar measurements using the high resolution calorimeter TAPS, which uses BaF₂ as scinitillator material.

¹⁾ supported by BMBF and DFG.