Proportional crosstalk correction for the segmented clover at iThemba LABS
PHYSICA SCRIPTA(2017)
摘要
Reaching new depths in nuclear structure investigations requires new experimental equipment and new techniques of data analysis. The modern gamma-ray spectrometers, like AGATA and GRETINA are now built of new-generation segmented germanium detectors. These most advanced detectors are able to reconstruct the trajectory of a gamma-ray inside the detector. These are powerful detectors, but they need careful characterization, since their output signals are more complex. For instance for each gamma-ray interaction that occurs in a segment of such a detector additional output signals (called proportional crosstalk), falsely appearing as an independent (often negative) energy depositions, are registered on the non-interacting segments. A failure to implement crosstalk correction results in incorrectly measured energies on the segments for two- and higher-fold events. It affects all experiments which rely on the recorded segment energies. Furthermore incorrectly recorded energies on the segments cause a failure to reconstruct the gamma-ray trajectories using Compton scattering analysis. The proportional crosstalk for the iThemba LABS segmented clover was measured and a crosstalk correction was successfully implemented. The measured crosstalk-corrected energies show good agreement with the true gamma-ray energies independent on the number of hit segments and an improved energy resolution for the segment sum energy was obtained.
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关键词
gamma-ray instruments,segmented germanium detectors,TIGRESS,pulse shapes analysis,crosstalk
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