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  • 25.40.−h  (2)
  • 11.15Kc  (1)
  • 1
    Electronic Resource
    Electronic Resource
    K + production in proton and deuteron induced reactions at subthreshold energies (1994)
    Springer
    The European physical journal 349 (1994), S. 77-86 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofK + mesons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to one-step nucleon-nucleon (NN → N ΛK +),Δ- nucleon (ΔN → N Λ K+) and two-step pion-nucleon (πN → K + Λ) production channels on the basis of experimental ground state momentum distributions and free on-shell production processes. Whereas forK + production in proton-nucleus reactions the secondary channelπN clearly dominates at subthreshold energies, meson and nucleon induced channels are of similar magnitude in deuteron-nucleus reactions. Contrary to nucleus-nucleus collisions theΔ induced reaction channels are found to be of minor importance. The experimental differentiation of the underlying microscopic reaction channels appears possible via differential proton —K + coincidence measurements as shown in detail by the microscopic simulations including proton rescattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01296336
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    η Production in proton-nucleus reactions (1991)
    Springer
    The European physical journal 340 (1991), S. 51-57 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofη-mesons in proton-nucleus reactions is analysed with respect to primary nucleon-nucleon (NN→NNη) and secondary pion-nucleon (πN→ηN) production processes on the basis of Hartree-Fock groundstate momentum distributions and free on-shell production processes. The folding model adopted compares well for meson production with more involved simulations based on VUU transport equations. Similar to K+ production in proton-nucleus reactions theη-mesons are primarily produced by theπN →ηN channel. However,η-mesons are absorbed in nuclei via excitation of the N* (1535) resonance which leads to strong distortions of the primordial spectra. On the other hand, the experimental mass dependence of the differential cross sections might yield information about the in-medium properties of this resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284480
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quark deconfinement in a semiclassical string-bag model (1987)
    Springer
    The European physical journal 327 (1987), S. 243-249 
    Details
    ISSN: 1434-601X
    Keywords: 11.15Kc ; 12.35Ht ; 12.40Qq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe the effective static quark-(anti)quark colour potential inside hadronic bags in terms of linear strings and semiclassical corrections of orderħ/r. According to (chromo-) electrostatics we generalize this potential to colour non-neutral configurations making use of the mirror charge method. A thermodynamical study of quark-antiquark pairs and many-quark systems shows a virtually higher order phase transition from the hadronic phase to colour deconfinement. The free plasma stage, furthermore, is achieved only at temperatures much higher thanT c≈200 MeV. Hadrons increase in size by a factor of 1.5 fromT=0 toT=T c.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284447
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    Paper (German National Licenses)
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