The response of lead-tungstate scintillators (PWO) to photons with energies in the range 13 MeV-64 MeV
Författare
Summary, in English
The response of a matrix of 25 lead tungstate (PWO) scintillator detectors, operated at -25 degrees C, to photons in the range 13 MeV-64 MeV has been measured at the tagged-photon facility at MAX-lab, Lund. The tapered PWO crystals, each with a length of 200 mm and a cross-section of 24.4 x 24.4 mm(2) in the front end, read out by 19 mm photomultiplier tubes, were arranged in a 5 x 5 matrix. The response was measured for photons directed towards the centre of the central crystal as well as for photons directed towards the corner of the central crystal, where four crystals meet. The obtained energy resolution surpasses what has been published so far and is close to the limit given by Poisson statistics and escaped energy. For photons directed towards the centre(corner) of the central crystal the relative energy resolution, defined as (FWHM/2.35)/E-gamma, decreases from 7.3%(11.0%) at E-gamma = 13 MeV to 3.3%(3.6%) at E-gamma = 64 MeV. The reconstructed point of impact of a photon in this energy range is determined with an uncertainty (one standard deviation) of 7.3 +/- 0.1 mm. (C) 2012 Elsevier B.V. All rights reserved.
Avdelning/ar
Publiceringsår
2012
Språk
Engelska
Sidor
36-43
Publikation/Tidskrift/Serie
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Volym
679
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Accelerator Physics and Instrumentation
Nyckelord
- Lead tungstate
- PWO scintillators
- Electromagnetic calorimeter
- PANDA
- Tagged photons
Status
Published
Projekt
- Development of Radiation Detectors and Radiation-Detection Techniques
ISBN/ISSN/Övrigt
- ISSN: 0167-5087