München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 27: Instrumentation und Anwendungen

HK 27.4: Vortrag

Dienstag, 21. März 2006, 17:45–18:00, H

Pulse shape analysis of segmented large volume HPGe detectors — •Bart Bruyneel, Peter Reiter, and Gheorghe Pascovici — IKP, Universität zu Köln

γ-ray tracking in future HPGe arrays like AGATA will rely on pulse shape analysis (PSA) of multiple γ-interactions. A simple and fast procedure was developed which enabled the first full characterization of a segmented large volume HPGe detector. Preamplified signals from a 12-fold segmented MINIBALL detector [1] were processed using digital electronics. The crystal orientation, detector geometry, changing field strength, space charge, crosstalk and the anisotropic behavior of electron and hole mobility are taken into account. The high accuracy in simulation enabled very high position resolution using PSA. We report on the first application of this technique in a real experiment [2] aiming at the reconstruction of the line width of γ-rays using adaptive optics for the diffraction of γ-rays. A position resolution of σ = 1.4 mm was achieved with 184 keV γ-rays employing the same detector setup.

∗ Supported by the German BMBF(06 K-167).

[1] J. Eberth et al., Prog. Part. Nucl. Phys. 46 389 (2001)

[2] T. Materna et al., Submitted to Nature