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  • 2000-2004  (8)
  • 1995-1999  (9)
  • 1980-1984  (4)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Connected Green function approach to symmetry breaking inΦ 1+1 4 -theory (1995)
    Springer
    The European physical journal 353 (1995), S. 301-310 
    Details
    ISSN: 1434-601X
    Keywords: 11.30.Qc ; 11.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than 4 th order for theλΦ 4-theory in 1 + 1 dimensions. We apply the equations to the investigation of spontaneous symmetry breaking, i.e. to the evaluation of the effective potential at temperatureT=0. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling ofλ crit /4m 2=2.446 as compared to a first order phase transition andλ crit /4m 2=2.568 from the Gaussian effective potential approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292336
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Studying the ωN elastic and inelastic cross section with nucleons (2000)
    Springer
    The European physical journal 7 (2000), S. 271-277 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 13.75.Cs Nucleon-nucleon interactions – 25.40.-h Nucleon-induced reactions – 25.10.+s Nuclear reactions involving few-nucleon systems – 11.80.Fv Eikonal approximation – 24.10.Lx Monte Carlo simulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We explore the possibility to measure the elastic and inelastic ωN cross section in p+d→d+ω+p sp and p+A reactions. Our studies indicate that the elastic scattering cross sections can be determined for ω momenta above 1 GeV/c in p+d reactions by gating on high proton spectator momenta whereas the ωN absorption cross section down to low relative ω momenta is most effectively studied in p+A reactions at beam energies 2.0–2.7 GeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013602
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Interactions of charmed mesons with nucleons in the ¯p d reaction (2000)
    Springer
    The European physical journal 7 (2000), S. 279-285 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.43.+t Antiproton-induced reactions – 14.40.Lb Charmed mesons – 14.65.Dw Charmed quarks – 13.25.Ft Decays of charmed mesons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the possibility to measure the elastic ΦN (Φ≡J/ψ,ψ(2S), ψ(3770), χ2c) scattering cross section in the reaction ¯p+d→Φ+n sp and the elastic D(¯D)N scattering cross section in the reaction ¯p+d→D − D 0 p sp. Our studies indicate that the elastic scattering cross sections can be determined for Φ momenta about 4–6 GeV/c and D/¯D momenta 2–5 GeV/c by selecting events with p t≥ 0.4 GeV/c for Φ's and p t(p sp) ≥ 0.5 GeV/c for D/¯D-meson production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013607
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the current status of OZI violation in πN and pp reactions (2000)
    Springer
    The European physical journal 7 (2000), S. 407-413 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 12.10.Kt Unification of couplings – 12.40.Vv Vector-meson dominance – 13.75.Cs Nucleon-nucleon interactions – 13.75.Gx Pion-baryon interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The available data on ω and φ production from πN and pp collisions are reanalyzed with respect to an OZI rule violation on the basis of transition matrix elements. The data are found to be compatible with a constant ratio R , which however, deviates substantially from the SU(3) prediction based on the present knowledge of the φ-ω mixing angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013625
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    (p,π±) correlations in central heavy-ion collisions at 1 ÷ 2 AGeV (2000)
    Springer
    The European physical journal 7 (2000), S. 507-518 
    Details
    ISSN: 1434-601X
    Keywords: PACS:25.75.-q Relativistic heavy-ion collisions – 25.75.Dw Particle and resonance production – 25.75.Gz Particle correlations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The proton–charged pion correlated emission is studied in the reactions Au (1.06 AGeV) + Au, Ni (1.06 and 1.93 AGeV) + Ni and Ni (1.97 AGeV) + Cu within the BUU approach. The associated invariant mass distributions are shifted to smaller energies with respect to the free Δ(1232) mass distribution due to kinematical reasons. We find that the existing and partly conflicting experimental data do not allow to draw definite conclusions on the in-medium modification of the Δ(1232).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013652
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    Paper (German National Licenses)
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  • 8
    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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    Paper (German National Licenses)
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  • 9
    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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  • 10
    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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    Paper (German National Licenses)
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