Bochum 1998 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 60: Instrumentation VI, Detector Systems
HK 60.8: Vortrag
Donnerstag, 19. März 1998, 16:15–16:30, A
Source and in-beam tests of the MINIBALL prototype Ge-detector — •C. Fischbeck1, D. Weisshaar2, D. Rudolph1, M. Chromik1, J. Eberth2, D. Gassmann1, D. Habs1, P. G. Thirolf1, H.-G. Thomas2, Ch. Gund3, and D. Schwalm3 — 1LMU München, D-85748 Garching — 2Universität zu Köln, D-50937 Köln — 3Max-Planck-Institut für Kernphysik, D-69029 Heidelberg
Radioactive beam facilities will soon become operational in Europe. To exploit these weak beams dedicated Ge-γ-detector arrays in close geometry are currently being built: Miniball and Exogam [1]. The basic element of Miniball is a six-fold segmented encapsulated Ge-detector of Euroball shape [2]. The capsules are envisaged to be used individually, or packed to clusters of either three or seven. This will provide a high level of flexibility of the set-up, dedicated to the demands of different kinds of experiments. Mid 1997 the first working prototype was delivered. Extensive tests with (collimated) sources have been performed to check the response of the prototype against Geant-simulations, including pulse-shape analysis to elucidate radial position sensitivity. Data points at high γ-ray energies (up to 7 MeV) were added by measuring the 24Al β+ decay following the reaction 24Mg(p,n) at the Munich Tandem. The fusion reaction 32S+24Mg at 130 MeV provided a realistic test (v/c=5 %) to reduce Doppler-broadening by employing position information of incident γ rays.
[1] D. Habs et al., Prog. Part. Nucl. Phys. 38, 111 (1997).
[2] J. Eberth et al., Prog. Part. Nucl. Phys. 38, 29 (1997).