Abstract
A sophisticated design of 750 LaBr3(Ce):LaCl3(Ce) phoswich crystals (CEPA10) with a segmentation determined by the Doppler correction and an energy resolution of 5% at 1 MeV is presented. Monte Carlo simulations have been performed for high energy protons (50–500 MeV) and gamma radiation (0.5–30 MeV) to determine the length and shape of the crystals for optimum performance of the detector. In the case of protons, the two-layer detector can be used as a ΔELaBr3 − ETot telescope or, for very high energies, as a double energy loss detector (ΔELaBr3 + ΔELaCl3), in order to determine the initial energy. In addition, an experimental test with high energy protons (70–230 MeV) was performed at the cyclotron center in Krakow, Poland with a first prototype of 2 x 2 phoswich rectangular crystals (CEPA4) packed in an aluminum can (0.5 mm case). To simulate CEPA10 efficiencies and resolutions, optical pulses detected in CEPA4 by photomultiplier tubes with a DAQ system were used as energy input functions in Monte Carlo simulations.
Highlights
Detectors made of fast scintillator materials, properly segmented for Doppler correction and adapted to a high level of electronics and mechanical integration, are increasingly needed to study nuclear reactions at relativistic energies
A very realistic simulation of CEPA10 was performed when the photomultiplier (PM) pulses detected with a first prototype of 2 x 2 phoswich rectangular crystals (CEPA4) of 10 cm length (4 cm of LaBr3 + 6 cm of LaCl3) packed in one can made of Al (0.5 mm case) were included in R3BRoot simulation package.[2]
We have presented a sophisticated design of a 750 LaBr3(Ce):LaCl3(Ce) phoswich crystal detector (CEPA10) with a high energy resolution and efficiency for protons and gamma radiation
Summary
Detectors made of fast scintillator materials, properly segmented for Doppler correction and adapted to a high level of electronics and mechanical integration, are increasingly needed to study nuclear reactions at relativistic energies. In an attempt to complete the CEPA10 final design, we have used Monte Carlo simulations to establish the proper shape and length of the crystals for the most efficient high energy proton and gamma radiation detection.
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