$\gamma$-Ray position reconstruction in large monolithic LaCl${}_3$(Ce) crystals with SiPM readout

Abstract

We report on the spatial response characterization of large LaCl${}_3$(Ce) monolithic crystals optically coupled to 8$\times$8 pixel silicon photomultiplier (SiPM) sensors. A systematic study has been carried out for 511 keV $\gamma$-rays using three different crystal thicknesses of 10 mm, 20 mm and 30 mm, all of them with planar geometry and a base size of 50$\times$50 mm${}^2$. In this work we investigate and compare two different approaches for the determination of the main $\gamma$-ray hit location. On one hand, methods based on the fit of an analytical model for the scintillation light distribution provide the best results in terms of linearity and field of view, with spatial resolutions close to $\sim$1 mm FWHM. On the other hand, position reconstruction techniques based on neural networks provide similar linearity and field-of-view, becoming the attainable spatial resolution $\sim$3 mm FWHM. For the third space coordinate $z$ or depth-of-interaction we have implemented an inverse linear calibration approach based on the cross-section of the measured scintillation-light distribution at a certain height. The detectors characterized in this work are intended for the development of so-called Total Energy Detectors with Compton imaging capability (i-TED), aimed at enhanced sensitivity and selectivity measurements of neutron capture cross sections via the time-of-flight (TOF) technique.

arXiv commentAccepted Manuscript Elsevier / CC-BY-NC-ND

References in corpus (3)

• Localisation of gamma-ray interaction points in thick monolithic CeBr3 and LaBr3:Ce scintillators
• On the performance of large monolithic LaCl3(Ce) crystals coupled to pixelated silicon photosensors
• First tests of the applicability of $\gamma$-ray imaging for background discrimination in time-of-flight neutron capture measurements

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• Detailed simulation for the ClearMind prototype detection module and event reconstruction using artificial intelligence
• Review and new concepts for neutron-capture measurements of astrophysical interest