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  • 2000-2004  (8)
  • 1995-1999  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    η′ Production in proton-proton collisions near threshold (1998)
    Springer
    The European physical journal 2 (1998), S. 333-335 
    Details
    ISSN: 1434-601X
    Keywords: PACS:13.75.C Nucleon-nucleon interactions – 12.40.V One-meson exchange model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstact: Within the one-pion exchange model we calculate the near-threshold η′ production from pp collisions including the final state interaction between the protons. Since the description of the data is quite well we conclude that η, ρ or ω exchange currents either play no role or cancel each other to a large extent in this reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050129
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation dynamics of Yukawa-theory in 1+1 dimensions (1998)
    Springer
    The European physical journal 2 (1998), S. 355-370 
    Details
    ISSN: 1434-601X
    Keywords: PACS:11.10-z Field theory – 11.10.Ef Lagrangian and Hamiltonian approach – 11.15.Tk Other nonperturbativ techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstact: Using the method of correlation dynamics we investigate the properties of a field-theory for fermions and scalar bosons coupled via a Yukawa interaction. Within this approach, which consists in an expansion of full equal-time Green functions into connected equal-time Green functions and a corresponding truncation of the hierarchy of equations of motion we carry out calculations up to 4th order in the connected Green functions and evaluate the effective potential of the theory in 1+1 dimensions on a torus. Comparing the different approximations we find a strong influence of the connected 4-point functions on the properties of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050132
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Isospin equilibration in relativistic heavy-ion collisions (1999)
    Springer
    The European physical journal 5 (1999), S. 77-84 
    Details
    ISSN: 1434-601X
    Keywords: PACS:25.75.+r Relativistic heavy-ion collisions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the mixing and the kinetic equilibration of projectile and target nucleons in relativistic heavy-ion collisions in the energy regime between 150 AMeV and 2 AGeV in a coupled-channel BUU (CBUU) approach. We find that equilibrium in the projectile-target degrees of freedom is in general not reached even for large systems at low energy where elastic nucleon-nucleon collisions dominate. Inelastic nucleon excitations are more favorable for equilibration and their relative abundance increases both with energy and mass. Experimentally, the projectile/target admixture can be determined by measuring the degree of isospin equilibration in isospin asymmetric nuclear collisions. For one of the most promising systems currently under investigation, 96 44Ru +96 40Zr, we investigate the influence of the equation of state and the inelastic in-medium cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050259
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of flow effects in relativistic heavy-ion collisions within the CBUU approach (1999)
    Springer
    The European physical journal 5 (1999), S. 157-172 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.75.-q Relativistic heavy-ion collisions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study flow phenomena in relativistic heavy-ion collisions, both in transverse and radial direction, in comparison to experimental data. The collective dynamics of the nucleus-nucleus collision is described within a transport model of the coupled channel BUU type (CBUU). This recently developed version includes all nucleonic resonances up to 1.95 GeV in mass and mean-field potentials both of the Skyrme and momentum dependent MDYI type. We find that heavy resonances play an important role in the description of transverse flow above 1 AGeV incident energy. For radial flow we analyse reaction times and equilibration and extract the parameters T and β for temperature and collective flow velocity within different prescriptions. Furthermore, we apply a coalescence model for fragment production and check the mass dependence of the flow signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050272
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  • 7
    Electronic Resource
    Electronic Resource
    On the ΔI= 1/2 rule in the ΛN→NN reaction (1999)
    Springer
    The European physical journal 5 (1999), S. 127-129 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 13.30.-a Decays of baryons – 13.75.Ev Hyperon-nucleon interaction – 21.80 Hypernuclei – 25.80.Pw Hyperon-induced reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: It is shown that the mass dependence of the Λ-lifetime in heavy hypernuclei is sensitive to the ratio of neutron-induced to proton-induced non-mesonic decay rates R n/R p. A comparison of the experimental mass dependence of the lifetimes with the calculated ones for different values of R n/R p leads to the conclusion that this ratio is larger than 2 on the confidence level of 0.75. This suggests that the phenomenological ΔI= 1/2 rule might be violated for the nonmesonic decay of the Λ-hyperon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050267
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  • 8
    Electronic Resource
    Electronic Resource
    On the search for a narrow penta-quark Z+-baryon in NN interactions (2000)
    Springer
    The European physical journal 9 (2000), S. 115-118 
    Details
    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
    URL: http://dx.doi.org/10.1007/s100500070061
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Λ-Hypernucleus formation in proton-nucleus reactions (1995)
    Springer
    The European physical journal 351 (1995), S. 217-224 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.-h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the production ofΛ hyperons inp + A reactions within the BUU transport approach including elasticΛ N rescattering and extract theΛ sticking probabilities and hypernucleus formation cross sections as a function of bombarding energy and target mass. At 1.5 GeV about 25% of theΛ hyperons are found to be bound in case of heavy nuclei like238U leading to large cross sections forΛ-hypernuclei. The respective hypernuclei show broad distributions in excitation energy, momentum and angular momentum. The decay of theΛ hyperon in case of heavy targets is found to be almost entirely due to nonmesonic decay channels, i.e.ΛN → NN processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289532
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Connected Green function approach to symmetry breaking inΦ 1+1 4 -theory (1995)
    Springer
    The European physical journal 353 (1995), S. 301-310 
    Details
    ISSN: 1434-601X
    Keywords: 11.30.Qc ; 11.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than 4 th order for theλΦ 4-theory in 1 + 1 dimensions. We apply the equations to the investigation of spontaneous symmetry breaking, i.e. to the evaluation of the effective potential at temperatureT=0. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling ofλ crit /4m 2=2.446 as compared to a first order phase transition andλ crit /4m 2=2.568 from the Gaussian effective potential approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292336
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