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  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of relaxation phenomena in heavy-ion collisions (1978)
    Springer
    The European physical journal 284 (1978), S. 209-216 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transfer of mass, as well as the dissipation of relative kinetic energy and relative angular momentum in deeply inelastic heavy-ion collisions are studied as functions of time. Based on the determination of a parametrized deflection function from the experimental angular distributions, a classical model for the calculation of the mean interaction time as a function of initial relative angular momentum is presented. The method allows to include also those processes which correspond to long interaction times. The model is applied to determine mass transport coefficients from experimental mass (or element) distributions. The resulting mass drift and diffusion coefficients are accurate within less than 30% and compare well with the systematics obtained from the microscopic transport theory. The energy loss as function of interaction time is consistent with the following picture: Fast dissipation of the radial part of the kinetic energy accompanied by the loss of angular momentum with a larger relaxation time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411331
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microscopic transport theory of heavy-ion collisions (1978)
    Springer
    The European physical journal 286 (1978), S. 271-279 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the transfer of relative angular momentum into internal angular momentum of the fragments in deeply inelastic heavy-ion collisions. The previous studies of drift and diffusion coefficients for mass transfer and energy dissipation are extended to include the dissipation of relative angular momentum. In a single-particle model the transport coefficients are obtained in closed form. We discuss their dependence on initial relative angular momentuml, dissipated angular momentum, mass asymmetry and total mass. Using thel-dependent interaction times obtained earlier we calculate mean value and variance of the dissipated angular momentum. For sufficiently long interaction times, the mean value reaches the sticking limit. The large fluctuations, however, do not allow for a classical description of angular momentum dissipation. These results are consistent with recentγ-multiplicity experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408256
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Relaxation times in dissipative heavy-ion collisions (1979)
    Springer
    The European physical journal 290 (1979), S. 47-55 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The classical model introduced earlier for analyzing experimental data on dissipative heavy-ion collisions, is generalized to include effects from the gradual dissipation of radial kinetic energy and from the development of fragment deformations during the collision. Relaxation times for the dissipation of radial kinetic energy (τ R ) and relative angular momentum (τ l ) as well as for the development of deformations (τα) are fitted to the reaction86Kr (8.18 MeV/u) +166Er and applied to three other reactions. A consistent set of relaxation times isτ R = 0.3 · 10−21 s,τ l =1.5 · 10−21 s andτ α = 5 · 10−21 s. Empirical mass transport coefficients are deduced from comparisons with experimental element distributions. Effects from fluctuations in the deflection function are discussed. Evidence is found for the existence of a relaxation time of the order 10−21 s in the mass-drift coefficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408479
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    Paper (German National Licenses)
    Fulltext
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