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CEPA4: A LaBr3(Ce)/LaCl3(Ce) Phoswich prototype array for simultaneous detection of high-energy gamma and proton radiation

AuthorsTengblad, Olof ; García Borge, María José ; Nácher, Enrique ; Perea, Ángel ; Ribeiro, Guillermo; Sánchez del Río, José ; Martensson, M.; Nilsson, T.; Johansson, H.T.
Issue Date2-Jun-2014
Citation2nd Conference on >Advances in Radioactive Isotope Science> (2014)
AbstractFast scintillator materials and properly segmented detectors for Doppler correction are needed to study reactions at relativistic energies. CEPA4 is a design effort in this direction: CEPA4 is an array of 4 individual optically isolated scintillator detectors, each of them consisting of 4 cm of LaBr3(Ce) coupled to 6 cm of LaCl3(Ce) in phoswich configuration with a total entrance surface of 60x60 mm2 and packed together in a can of Al of 0.5 mm thickness with a readout surface of 4mm glass. The response of CEPA4 to high-energy protons was measured using proton beams from the cyclotron at the IFJ facility in Krakow. This accelerator, designed for medical treatment, provides mono-energetic proton beams ranging from 70 to 220 MeV with a resolution < 1%. The maximum energy was just enough to test the punch-through of protons in the total of 10 cm phoswich, which happens arround 200 MeV. The two-layer detector can be used as a ¿ELaBr3 ¿ ETot telescope or if very high energies as a double energy loss detector (¿ ELaBr3+ ¿ ELaCl3) in order to determine the initial energy. These results are the first experimental tests obtained with high energy protons for an array of LaBr3(Ce):LaCl3(Ce) phoswich crystals. The electronic set-up was made in two branches, an analogue and a digital, in order to process the pulses, 4 Hamamatsu R5380 PM tubes were coupled via the 4mm glass window to the phoswich crystals. Pulses shape analysis was performed to reconstruct the primary energy of the protons. An analytical method to calculate the ultimate resolution of the array based on the ¿ELaBr3 ¿ ETot projections on lineal function (for energies at which protons deposit their energy in the first crystals ) and third grade functions (protons that deposit their energy in the second crystals) is presented.
DescriptionITO International Research Center, University of Tokyo. Tokyo, Japan from June 1 to 6, 2014
Appears in Collections:(CFMAC-IEM) Comunicaciones congresos
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