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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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the possibility of f 0 observation in low energy pp collisions (1999)
    Springer
    The European physical journal 4 (1999), S. 165-170 
    Details
    ISSN: 1434-601X
    Keywords: PACS:13.75.Cs Nucleon-nucleon interactions – 13.75.Gx Pion-baryon interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Within the meson-exchange model we calculate f 0-meson production cross section in πN and NN reactions and investigate the possibility for f 0 observation via the K¯K decay mode in pp collisions. Our studies indicate that an extraction of the f 0 signal is unlikely due to the large background from other reaction channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050215
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    On the ΔI= 1/2 rule in the ΛN→NN reaction (1999)
    Springer
    The European physical journal 5 (1999), S. 127-129 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 13.30.-a Decays of baryons – 13.75.Ev Hyperon-nucleon interaction – 21.80 Hypernuclei – 25.80.Pw Hyperon-induced reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: It is shown that the mass dependence of the Λ-lifetime in heavy hypernuclei is sensitive to the ratio of neutron-induced to proton-induced non-mesonic decay rates R n/R p. A comparison of the experimental mass dependence of the lifetimes with the calculated ones for different values of R n/R p leads to the conclusion that this ratio is larger than 2 on the confidence level of 0.75. This suggests that the phenomenological ΔI= 1/2 rule might be violated for the nonmesonic decay of the Λ-hyperon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050267
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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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    Paper (German National Licenses)
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