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  • 1
    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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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pion and eta photoproduction in nuclei (1995)
    Springer
    The European physical journal 352 (1995), S. 223-230 
    Details
    ISSN: 1434-601X
    Keywords: 25.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the quasifree photoproduction of pions and eta mesons on nuclei from12C to208Pb. Assuming that for the quasifree process the cross sections forπ/η photoproduction on a nucleon in medium are — besides a lowering due to Pauli blocking — identical to those on a free nucleon, we use these as an input. The produced mesons or resonances then propagate through the nucleus where they can undergo several scattering and absorption processes. This final state interaction, which leads to a lowering of the initial meson yield up to 70%, we simulate in a coupled channel Boltzmann-Uehling-Uhlenbeck transport model. It allows us to study in detail the influence of Fermi motion, Pauli blocking and of the additional decay channels for nucleon resonances in medium on the photoproduction cross section. The calculated total and differential cross sections are compared to experimental data and the influence of the different medium effects on the cross sections is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01298912
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  • 4
    Electronic Resource
    Electronic Resource
    Production of eta-mesons in collisions of nucleons and delta-resonances (1995)
    Springer
    The European physical journal 353 (1995), S. 333-339 
    Details
    ISSN: 1434-601X
    Keywords: 13.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the cross section for the production ofη-mesons viaΔN → NNη in a relativistic One-Boson-Exchange-Model. Using this cross section we then determine the probability for the production of anη-meson by aΔ-resonance moving in nuclear matter. The result is compared to prescriptions in BUU-calculations in whichη-production proceeds both through a direct channel and through the sequential processΔ → Nπ;πN → Nη.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292339
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    Paper (German National Licenses)
    Fulltext
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