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  • 1
    ISSN: 1434-601X
    Keywords: 25.70 ; 14.40.Aq ; 21.65. + f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The pion production cross section in nucleus-nucleus collisions at aboutE lab/A=1 GeV is calculated within the relativistic (RQMD) and the nonrelativistic quantum molecular dynamics (QMD) approach. We use both soft and hard equations of state (EOS) with and without the momentum dependence in the interaction. For the nucleon-nucleon (NN) cross section, isospin-dependent Cugnon parameterization and BruecknerG-matrix ones are utilized. A parameterized cross section is used for pion production in baryon-baryon collisions. The reabsorption of pions in the nuclear medium is taken into account in an empirical way. A detailed comparison is made between the pion production cross sections obtained in RQMD and QMD, with soft and hard EOS, with and without the momentum dependence in the in-medium NN interaction, with different NN cross sections and with different pion mean free paths. The agreement between the theoretical results and available experimental data is encouraging, although no definite and systematical evidence is found concerning the incompressibility of nuclear matter and the significance of a fully Lorentz covariant treatment of heavy-ion collisions at present energy domain.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: 24.10.-i ; 24.10.Eq ; 24.20.Ht ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Elastic, inelastic scattering as well as one-neutron transfer channels have been measured over a wide angular range for systems16O+16O at the incident energy of 350 MeV and20Ne+12C at 390 MeV, respectively, using the Q3D magnetic spectrometer. In both cases differential cross sections have been measured down to about 50 nb/sr (or dσ/dσ R≤10−4) at large angles. For the16O+16O system refractive contributions are found at the level of these cross sections, whereas in the20Ne+12C case a steeper decrease of the differential cross section with the angle is observed and the refractive contribution can not be determined. The elastic scattering data have been analyzed using standard Woods-Saxon potentials and potentials calculated in different versions of the double-folding model. Some properties of these potentials are tested in the calculations for inelastic scattering and one-neutron transfer within the DWBA. With the refractive pattern observed for the16O+16O system, the scattering and transfer data are found to be sensitive to the interaction potential at small internuclear distances down to about 2.5 fm.
    Type of Medium: Electronic Resource
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