Henning Schaffner

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—The performance of a position sensitive-ray scintil-lator detector (PSD) is described. This PSD is based on a lutetium yttrium oxyorthosilicate (LYSO) crystal read out by a crossed-wire anode position sensitive photomultiplier tube (PSPMT). The main difference with respect to similar existing devices is the individual multi-anode readout (IMAR) approach(More)
Future experiments on hypernuclei γ-spectroscopy at FINUDA@DAFNE and PANDA@FAIR require the operation of germanium detectors in high magnetic fields (B ≈ 1 T). The performance of these detectors in such an environment has not been well investigated. In particular, one might expect three problems to arise: (i) breakdown of FETs in the preamplifiers, (ii)(More)
The performance of a position sensitive gamma-ray scintillator detector (PSD) is described. This PSD is based on a lutetium yttrium oxyorthosilicate (LYSO) crystal read out by a crossed-wire anode position sensitive photomultiplier tube (PSPMT). The main difference with respect to similar existing devices is the individual multi-anode readout (IMAR)(More)
A systematic study of the population probabilities of microsecond isomers produced following the fragmentation of 208 Pb projectiles at 1 GeV/nucleon has been undertaken at the SIS/FRS facility at GSI Darmstadt. Gamma decays from approximately 20 isomeric states, mainly in the rare-earth and transitional nuclei with Aϳ180, were identified and the(More)
100 Sn is a unique case in the nuclear landscape, being doubly magic and the heaviest particle-stable N=Z nucleus. It had been produced and studied already in two FRS experiments [1,2] identifying together eight events. With the improved intensities from the SIS an experiment with good statistics became feasible. We have produced 100 Sn and nuclei in its(More)
The β decay of five heavy, neutron-rich nuclei, 204,203 Pt and 202−200 Ir, has been investigated following relativistic cold fragmentation reactions of lead projectiles using the FRS+RISING set up at GSI. This paper reports on the study of the low-lying states in the decay daughter nuclei 204,203 Au and 202−200 Pt. The characteristic γ rays for each nucleus(More)
Pulse shapes of preamplifier signals for VEGA and EU-ROBALL detectors [1] under high magnetic field were further investigated. The analysis provides a new method which drives to recover the energy resolution under strong magnetic fields. The observation of a simultaneous large shift and broadening of the rise time distributions [2, 3] of preamplifier(More)
The core principle of segmented detectors like AGATA [1], GRETA [2], that will be used in future for 4π gamma detection arrays, is the application of the concept of pulse shape analysis (PSA). The key ingredient for this analysis is a data base containing pulses for all the interaction points inside the segmented detector. A full 3D scanning of the(More)
116 Ru and 118 Ru have been studied via β-delayed γ-ray spectroscopy of nuclei produced in fragmentation reactions at the Radioactive Ion-Beam Factory (RIBF) facility. Level schemes with positive-parity states up to spin J = 6 have been constructed. The results have been discussed in terms of the interacting boson model, the algebraic collective model, and(More)
The Segmented Super Clover VEGA detectors which were developed at GSI [1] consist of four Ge crystals of 14 cm length and 7 cm diameter composed like a clover leaf. Each Ge crystal is electrically segmented in radial quarters by using divided electrodes. The segmentation improves position sensitivity for reconstructing vertices of γ-ray interaction. To(More)