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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.74: Poster
Wednesday, March 18, 1998, 17:00–19:00, Foyer
A new preamplifier for the segmented HPGe detectors* — •D. Weißhaar1, G. Pascovici1, J. Eberth1, H.G. Thomas1, and L. Palafox2 — 1Institut für Kernphysik, Universität zu Köln — 2Max-Planck-Institut für Kernphysik, Heidelberg
In the framework of the MINIBALL project [1,2] a six-fold segmented
encapsulated HPGe detector has been developed which corresponds in
size and shape to the elements of the EUROBALL CLUSTER detector.
The segmentation as well as the radial position sensitivity extracted
from pulse shape analysis reduces the effective solid angle of the
detector and thus the Doppler broadening of γ-rays emitted
from fast moving nuclei. These properties are needed for
experiments proposed for the new radioactive beam
facilities like REX-ISOLDE.
Each detector requires seven preamplifiers - one for the core and
six for the segments - of small size, fast risetime for optimum pulse
shape analysis, and an excellent signal-to-noise ratio. As such
preamplifiers are not available commercially, a new preamplifier
for Ge detectors has been developed in Köln. The preamplifier is
designed in SMD technique and meets above mentioned requirements.
The performance of a six-fold
segmented encapsulated Ge detector equipped with these preamplifiers
was tested in-beam and with radioactive sources.
[1] J. Eberth et al., Prog. Part. Nucl. Phys. 38, 111 (1997).
[2] D. Habs et al., Prog. Part. Nucl. Phys. 38, 29 (1997).
see also C. Fischbeck et al., DPG Verhandlungen 1998.
* supported by BMBF under contract no. 06OK668 I(0)