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  • 2000-2004  (8)
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  • 1
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 11 (2001), S. 95-103 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 9 (2000), S. 115-118 
    ISSN: 1434-601X
    Keywords: PACS. 12.39.Mk Glueball and nonstandard multiquark/gluon states – 13.75.Cs Nucleon-nucleon interactions – 13.75.Jz Kaon-baryon interactions – 14.20.-c Baryons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The possibility for an observation of a narrow penta-quark Z+-baryon in NN reactions is discussed. It is shown that the pp↦nΣ+ K + reaction at excess energies around 100 MeV above threshold provides optimal conditions for Z+-baryon detection by an analysis of the nK+ invariant mass spectrum, if the Z+ mass is located around 1.5 GeV involving a rather narrow width.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 7 (2000), S. 271-277 
    ISSN: 1434-601X
    Keywords: PACS: 13.75.Cs Nucleon-nucleon interactions – 25.40.-h Nucleon-induced reactions – 25.10.+s Nuclear reactions involving few-nucleon systems – 11.80.Fv Eikonal approximation – 24.10.Lx Monte Carlo simulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We explore the possibility to measure the elastic and inelastic ωN cross section in p+d→d+ω+p sp and p+A reactions. Our studies indicate that the elastic scattering cross sections can be determined for ω momenta above 1 GeV/c in p+d reactions by gating on high proton spectator momenta whereas the ωN absorption cross section down to low relative ω momenta is most effectively studied in p+A reactions at beam energies 2.0–2.7 GeV.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 7 (2000), S. 279-285 
    ISSN: 1434-601X
    Keywords: PACS: 25.43.+t Antiproton-induced reactions – 14.40.Lb Charmed mesons – 14.65.Dw Charmed quarks – 13.25.Ft Decays of charmed mesons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the possibility to measure the elastic ΦN (Φ≡J/ψ,ψ(2S), ψ(3770), χ2c) scattering cross section in the reaction ¯p+d→Φ+n sp and the elastic D(¯D)N scattering cross section in the reaction ¯p+d→D − D 0 p sp. Our studies indicate that the elastic scattering cross sections can be determined for Φ momenta about 4–6 GeV/c and D/¯D momenta 2–5 GeV/c by selecting events with p t≥ 0.4 GeV/c for Φ's and p t(p sp) ≥ 0.5 GeV/c for D/¯D-meson production.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 7 (2000), S. 407-413 
    ISSN: 1434-601X
    Keywords: PACS: 12.10.Kt Unification of couplings – 12.40.Vv Vector-meson dominance – 13.75.Cs Nucleon-nucleon interactions – 13.75.Gx Pion-baryon interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The available data on ω and φ production from πN and pp collisions are reanalyzed with respect to an OZI rule violation on the basis of transition matrix elements. The data are found to be compatible with a constant ratio R , which however, deviates substantially from the SU(3) prediction based on the present knowledge of the φ-ω mixing angle.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 7 (2000), S. 507-518 
    ISSN: 1434-601X
    Keywords: PACS:25.75.-q Relativistic heavy-ion collisions – 25.75.Dw Particle and resonance production – 25.75.Gz Particle correlations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The proton–charged pion correlated emission is studied in the reactions Au (1.06 AGeV) + Au, Ni (1.06 and 1.93 AGeV) + Ni and Ni (1.97 AGeV) + Cu within the BUU approach. The associated invariant mass distributions are shifted to smaller energies with respect to the free Δ(1232) mass distribution due to kinematical reasons. We find that the existing and partly conflicting experimental data do not allow to draw definite conclusions on the in-medium modification of the Δ(1232).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-601X
    Keywords: PACS. 25.10.+s Nuclear reactions involving few-nucleon systems – 13.75.-n Hadron induced reactions – 13.60.Le Meson production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate the reactions πN↦a 0 N and pp↦da 0 + near threshold and at medium energies. An effective Lagragian approach and the Regge pole model are applied to analyze different contributions to the cross-section of the reaction πN↦a 0 N. These results are used to calculate the differential and total cross-sections of the reaction pp↦da 0 + within the framework of the two-step model in which two nucleons produce an a0-meson via π-meson exchange and fuse to a deuteron. The necessity of new measurements on a0 production and branching fractions (of its decay to the K and πη channels) is emphasized for clarifying the a0 structure. Detailed predictions for the reaction pp→da 0 + are presented for the energy regime of the proton synchrotron COSY-Jülich.
    Type of Medium: Electronic Resource
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