Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Instrumentation I

HK 6.1: Vortrag

Montag, 27. März 2017, 16:45–17:00, F 072

Pulse Shape Analysis with AGATA using coincident γ-ray detection after e⁺/e⁻ annihilation — •Lars Lewandowski and Peter Reiter for the AGATA collaboration — Institut für Kernphysik Köln

The γ spectrometer AGATA is a tracking array consisting of position sensitive, highly segmented HPGe detectors. The gamma ray tracking GRT is based on the pulse shape analysis PSA of the digital signals of the 36 segments and the central electrode. The PSA provides the interaction position within the segments by comparing the measured signals with simulations. To investigate and improve the position resolution a reliable method to determine the performance of the PSA is necessary. Therefore, a measurement with ²²Na, that decays by emission of a positron, was performed. The two 511 keV γ rays, that are emitted in an angle of 180 degree after e⁺/e⁻ annihilation, were detected in coincidence. In combination with the known annihilation position this provides a measure for the position resolution of the two detected γ rays. This method was used to improve the performance of the PSA, including a new way to calculate the figure of merit that is used to compare measured and simulated signals. Supported by the German BMBF (05P12PKFNE TP4)