AGATA: Gamma-ray tracking in segmented HPGe detectors

摘要

The next generation of radioactive ion beam facilities, which will giveexperimental access to many exotic nuclei, are presently being developed. Atthe same time the next generation of high resolution gamma-ray spectrometers,based on gamma-ray tracking, for studying the structure of these exotic nucleiare being developed. One of the main differences in tracking of $\gamma$ raysversus charged particles is that the gamma rays do not deposit their energy"continuously" in the detector, but in a few discrete steps. Also, in the fieldof nuclear spectroscopy, the location of the source is mostly well known whilethe exact interaction position in the detector is the unknown quantity. Thismakes the challenges of gamma-ray tracking in germanium somewhat differentcompared to vertexing in silicon detectors. In these proceedings we present themethods for determining the 3D interaction positions in the detector and howthese are used to reconstruct the gamma-ray tracks in the AGATA detector array.We also present preliminary simulation results of a proposed in-beam method tomeasure the interaction position resolution in the germanium detectors.