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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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  • 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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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    ωN final state interactions and ω-meson production from heavy-ion collisions (1999)
    Springer
    The European physical journal 6 (1999), S. 71-81 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.75.-q Relativistic heavy-ion collisions – 25.80.-e Meson- and hyperon-induced reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We calculate the elastic and inelastic ωN→ωN, →πN, →ρN, →ρπN, →ππN, →σN reactions within a boson exchange approximation where the ωρπ coupling constant and form factor are fixed by the reaction πN→ωN in comparison to the experimental data. We find rather large ωN cross sections at low relative momenta of the ω-meson which leads to a substantial broadening of the ω-meson width in nuclear matter. The implications of the ωN final state interactions are studied for ω production in 12C +12C, 40Ca +40Ca and 58Ni +58Ni reactions at about 2 · A GeV within the HSD transport approach; the drastic changes of the transverse mass spectra relative to a general m T-scaling (for π0 and η mesons) might be controlled experimentally by the TAPS Collaboration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050319
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  • 6
    Electronic Resource
    Electronic Resource
    On the current status of OZI violation in πN and pp reactions (2000)
    Springer
    The European physical journal 7 (2000), S. 407-413 
    Details
    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
    URL: http://dx.doi.org/10.1007/PL00013625
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  • 7
    Electronic Resource
    Electronic Resource
    A quantal toy model for heavy-ion collisions (1987)
    Springer
    The European physical journal 326 (1987), S. 21-31 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.−z ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A one-dimensional toy model of two moving finite boxes is analysed with respect to quantal phenomena associated with heavy-ion dynamics at low and intermediate energies. Special attention is payed to the relation between energy and momentum of the nucleons inside and outside the time-dependent mean field. A Wigner transformation of the one-body density matrix in space and time allows for a unique comparison with classical phase-space dynamics. It is found that high momentum components of the nuclear groundstate wave function approximately become on-shell during the heavy-ion reaction. This leads to the emission of energetic nucleons which do not appear classically. It is furthermore shown, that the low lying eigenstates of the dinuclear system for fixed time are only partly occupied throughout the reaction at intermediate energies. This opens up final phase space for nucleons after producing e.g. a pion or energetic photon. Though the present model does not allow for a reliable calculation of double differential nucleon spectra, pion or photon cross sections, it transparently shows the peculiar features of quantum dynamics in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294567
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  • 8
    Electronic Resource
    Electronic Resource
    Microscopic investigations of pion production in heavy-ion collisions (1987)
    Springer
    The European physical journal 326 (1987), S. 97-106 
    Details
    ISSN: 1434-601X
    Keywords: 25.70−z ; 25.90+k ; 13.75 Gx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Production mechanisms for subthreshold pions in nucleus-nucleus collisions are studied on a microscopic level. The non-relativistic expansion of the pseudoscalar πNN-vertex provides a basis for the construction of several two-nucleon models. These are incorporated into a dynamical description of the heavy-ion collision by boosted harmonic oscillators that adopts essential features from TDHF. The approach allows for a separate analysis of the various production processes and the influence of the collision dynamics on the total pion yield. Results are presented for the system16O +16O at laboratory energies of 40 and 80 MeV per nucleon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294576
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical study of a selfconsistent two-body theory for colliding ions in a one-dimensional model (1987)
    Springer
    The European physical journal 328 (1987), S. 423-429 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cn ; 24.10.−i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A selfconsistent quantal two-body theory as obtained from the density-matrix hierarchy is solved numerically for the first time for a one-dimensional system modelling α+ α collisions at 80 MeV/u. Various truncation schemes for the two-body correlation function are investigated in order to explore the convergence properties of the theory. We find that perturbative treatments with respect to two-body processes do not yield reliable results in the energy regime investigated and that the nuclear stopping power sensitively depends on the order of the two-body correlations considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289628
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamical aspects of intermediate-energy nucleus-nucleus collisions (1988)
    Springer
    The European physical journal 329 (1988), S. 487-495 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.-i ; 25.70.-z ; 25.80.Ls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of pions in intermediate energy nucleus-nucleus collisions by incoherent nucleon-nucleon collisions is studied within a microscopic quantal phase-space approach. Employing free production rates for the elementary processN+N → π+X experimental data for inclusive pion yields are approximately reproduced from 20–150 MeV/u within the first collision approximation. These results indicate that cooperative phenomena — apart from the time-dependent mean field — seem to play a minor role for energetic particle production even at very low bombarding energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294353
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