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)
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)
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)
The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear(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)
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 shell structure of atomic nuclei is associated with 'magic numbers' and originates in the nearly independent motion of neutrons and protons in a mean potential generated by all nucleons. During β(+)-decay, a proton transforms into a neutron in a previously not fully occupied orbital, emitting a positron-neutrino pair with either parallel or antiparallel(More)
The neutron-rich lead isotopes, up to (216)Pb, have been studied for the first time, exploiting the fragmentation of a primary uranium beam at the FRS-RISING setup at GSI. The observed isomeric states exhibit electromagnetic transition strengths which deviate from state-of-the-art shell-model calculations. It is shown that their complete description demands(More)