Author
D. Tröster
Other affiliations: CERN
Bio: D. Tröster is an academic researcher from University of Basel. The author has contributed to research in topics: Annihilation & Protonium. The author has an hindex of 4, co-authored 4 publications receiving 54 citations. Previous affiliations of D. Tröster include CERN.
Topics: Annihilation, Protonium, Spectrometer
Papers
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TL;DR: The γ-ray spectrum after p annihilation at rest was measured in two independent high-statistics runs as discussed by the authors, showing narrow peaks corresponding to masses of 1210, 1638, 1694 and 1771 MeV.
25 citations
TL;DR: In this article, the [gamma]-spectrum originating from pp[combining macron] annihilations at rest in liquid hydrogen was measured with two BGO spectrometers, and a total of 24 i?œ 106[gamma]s were accumulated.
16 citations
01 Apr 1986-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a spectrometer consisting of two sets of bismuth germanium oxide (BGO) crystals and a lead-glass array has been used to measure the π 0 and η momentum spectra produced from proton-antiproton annihilations at rest.
Abstract: A spectrometer consisting of two sets of bismuth germanium oxide (BGO) crystals and a lead-glass array has been used to measure the π 0 and η momentum spectra produced from proton-antiproton annihilations at rest. We describe the test of the BGO sets in electron beams of energies from 50 to 450 MeV. We discuss the method of construction and calibration of the lead-glass array, as well as procedures to extract the energy and position resolutions for detected photons. A momentum resolution (σ) for π 0 's and η's of 4% and 3%, respectively has been achieved at momenta below 1 GeV/ c .
8 citations
TL;DR: In this paper, the γ spectrum associated with p p annihilation on 4He at rest was measured, showing two peaks, at energies of 161.9 and 203.0 MeV, corresponding to intermediate narrow states of masses which seem to be related to states found in p p annihilations.
6 citations
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TL;DR: In this article, it was shown that the universe can be a patchwork consisting of distinct regions of matter and antimatter, and that after recombination, it is impossible to avoid annihilation near regional boundaries.
Abstract: We ask whether the universe can be a patchwork consisting of distinct regions of matter and antimatter. We demonstrate that, after recombination, it is impossible to avoid annihilation near regional boundaries. We study the dynamics of this process to estimate two of its signatures: a contribution to the cosmic diffuse γ-ray background and a distortion of the cosmic microwave background. The former signal exceeds observational limits unless the matter domain we inhabit is virtually the entire visible universe. On general grounds, we conclude that a matter-antimatter symmetric universe is empirically excluded.
261 citations
TL;DR: In this paper, recent progress in crystal growth technology is described for typical alkali (alkali-earth) halide and oxide scintillation crystals such as NaI:Tl, CsI: Tl, Bismuth germanate (BGO), Bi4Ge3O12, Cadmium tungstate (CWO), CdWO4, and cerium-doped gadolinium silicate (GSO:Ce).
153 citations
TL;DR: In this paper, a more phenomenological approach is adopted, in which various annihilation topologies combined with different prescriptions for the dependence of the effective quark-antiquark (QQ) creation/destruction operator on spin, flavor and color.
135 citations
TL;DR: In this paper, the general properties of antiproton-proton annihilation at rest are presented, with special focus on the two-meson final states, and the data exhibit remarkable dynamical selection rules: some allowed annihilation modes are suppressed by one order of magnitude with respect to modes of comparable phase-space.
97 citations
TL;DR: In this article, the Nambu and Jona-Lasinio model was used as a QCD-motivated effective lagrangian for the chiral symmetry breaking.
59 citations