Characterization of PARIS LaBr_3(Ce)-NaI(Tl) phoswich detectors up to E_γ ~ 22MeV

摘要

In order to understand the performance of the PARIS (Photon Array for the studies with Radioactive Ion and Stable beams) detector, detailed characterization of two individual phoswich (LaBr_3(Ce)-NaI(Tl)) elements has been carried out. The detector response is investigated over a wide range of E_γ = 0.6 to 22.6 MeV using radioactive sources and employing 11B(p,γ) reaction at E_p = 163 keV and E_p = 7.2 MeV. The linearity of energy response of the LaBr_3(Ce) detector is tested upto 22.6 MeVusing three different voltage dividers. The data acquisition system usingCAEN digitizers is set up and optimized to get the best energy and time resolution. The energy resolution of ~ 2.1% at E_γ = 22.6 MeV is measured for the configuration giving best linearity upto high energy. Time resolution of the phoswich detector is measured with a ~(60)Co source after implementing CFD algorithm for the digitized pulses and is found to be excellent (FWHM ~ 315 ps). In order to study the effect of count rate on detectors, the centroid position and width of the E_γ = 835 keV peak were measured upto 220 kHz count rate. The measured efficiency data with radioactive sources are in good agreement with GEANT4 based simulations. The total energy spectrum after the add-back of energy signals in phoswich components is also presented.