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  • 12.20.Fv  (2)
  • 34.50.F  (2)
  • 1985-1989  (4)
  • 1920-1924
Collection
Keywords
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Years
  • 1985-1989  (4)
  • 1920-1924
Year
  • 1
    Electronic Resource
    Electronic Resource
    Positron line structures in U-U collisions (1986)
    Springer
    The European physical journal 323 (1986), S. 275-280 
    Details
    ISSN: 1434-601X
    Keywords: 34.50.Fa ; 25.70.Gh ; 12.20.Fv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract U-U collisions at energies near the Coulomb barrier are discussed. A quantum mechanical treatment of nuclear motion including the influence of quasibound states in a pocket of the scattering potential is developed. Positron emission probabilities are calculated exhibiting a sharp line due to the decay of a hole in the supercritical 1s-state. In addition conversion processes and multiple pockets in the potential creating sidebands in the spectrum are computed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283785
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Systematics of spontaneous positron lines (1986)
    Springer
    The European physical journal 323 (1986), S. 261-274 
    Details
    ISSN: 1434-601X
    Keywords: 34.50.Fa ; 25.70.Ef ; 12.20.Fv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dynamical and spontaneous positron emission are investigated for heavy-ion collisions with long time delay using a semiclassical description. Numerical results and analytical expressions for the characteristic quantities of the resulting spontaneous positron line, i.e., its position, width, and cross section, are compared. The expected behaviour of the line position and cross section and its visibility against the spectrum of dynamically created positrons is discussed in dependence on the united chargeZ u of projectile and target nucleus in a range of systems fromZ u =180 up toZ u =188. The results are confronted with presently available experimental data, and possible implications on further experiments are worked out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283784
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Angular correlations of electron-positron pairs produced in heavy-ion collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 81-84 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 ; 34.50.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the strength of angular correlations between coincident electron-positron pairs produced in Pb + Pb collisions at 5.7 MeV/u. The angular correlations are predicted to be observable at electron energies above 200 keV, almost independent of positron energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295185
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  • 4
    Electronic Resource
    Electronic Resource
    Can multiple structures in positron spectra be caused by atomic effects? (1988)
    Springer
    The European physical journal 8 (1988), S. 305-313 
    Details
    ISSN: 1434-6079
    Keywords: 25.70 ; 34.50.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In recent experiments at least two structures have been detected in positron spectra from subcritical (total chargeZ ≦ 174) heavy-ion collisions at bombarding energiesE Lab=5.7−5.9 MeV/n. The origin of these structures is unexplained up to now. Atomic effects have already been discussed as a possible source in a previous paper, where a schematic ansatz for the electronic transition matrix elements was employed. Meanwhile numerical calculations forK-vacancy formation also exhibited oscillations in the impact parameter dependence when using this ansatz. In this paper we report on a scaling law describing these oscillations. As a consequence certain subsidiary conditions have to be imposed on our schematic ansatz, which in turn yield a new understanding on eligible atomic sources for multiple structures in the emission spectra of positrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437096
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