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  • 25.40.-h  (2)
  • 25.40.−h  (2)
  • 13.75 Gx  (1)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Antiproton production inp+A andd+A reactions at subthreshold energies (1994)
    Springer
    The European physical journal 348 (1994), S. 247-248 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.-h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of antiprotons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to one-step nucleon-nucleon (NN → NNp¯ p) and secondary Δ-nucleon (ΔN → NNN¯ p) production channels within a phase-space model incorporating the selfenergies of the baryons. It is found that contrary to nucleus-nucleus collisions the Δ induced reaction channels are of minor importance except at very low bombarding energies. The data from KEK are approximately reproduced when accounting for the internal momentum distribution of the deuteron which provides a natural explanation for the large enhancement of the ¯p cross section ind+A as compared top+A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305878
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    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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    Paper (German National Licenses)
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  • 5
    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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