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  • 1
    Electronic Resource
    Electronic Resource
    Nonmesonic decay of the Λ-hyperon in hypernuclei produced by p + Au collisions (2001)
    Springer
    The European physical journal 11 (2001), S. 1-4 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.30.-a Decays of baryons – 13.75.Ev Hyperon-nucleon interaction – 21.80Hypernuclei – 25.80.Pw Hyperon-induced reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The lifetime of the Λ-hyperon for the nonmesonic decay ΛN → NN has been determined by a measurement at COSY Jülich of the delayed fission of heavy hypernuclei produced in proton-Au collisions at T p = 1.9 GeV. It is found that heavy hypernuclei with mass numbers A≈ (180±5) and atomic numbers Z≈ (74±2) fission with a lifetime τΛ = 130±13 (stat.) ±15 (syst.) ps. This value together with the results obtained for other heavy hypernuclei in previous investigations indicates --on the confidence level of 0.9-- a violation of the phenomenological ΔI = 1/2 rule for the ΛN → NN transitions as known from the weak mesonic decays of kaons and hyperons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170089
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  • 2
    Electronic Resource
    Electronic Resource
    Studying the ω mass in-medium in γ + A →π0γ + X reactions (2001)
    Springer
    The European physical journal 11 (2001), S. 95-103 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.60.-r Photon and charged-lepton interactions with hadrons – 13.60.Le Meson production – 25.20.-x Photonuclear reactions – 14.40.-n Mesons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Simulations based on a coupled-channel transport model have been performed to analyze the feasibility to study the in-medium ω mass exploiting the process γ + A→π0γ + X for C, Ca and Nb nuclei. The distortions due to final-state interactions of the π0 and background contributions from the reaction γ + A→π0π0 + X are found to be small in the mass range of interest ( 0.6 〈 M π0γ 〈 0.8 GeV). Furthermore, the effect of the detector resolution on the π0γ mass determination is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170099
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    Paper (German National Licenses)
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