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  • 2000-2004  (2)
  • 1940-1944  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Electron–positron pair production in the external electromagnetic field of colliding relativistic heavy ions (2002)
    Springer
    The European physical journal 23 (2002), S. 545-550 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The results concerning the $e^+e^-$ production in peripheral highly relativistic heavy-ion collisions presented in a recent paper by Baltz et al. are rederived in a very straightforward manner. It is shown that the solution of the Dirac equation directly leads to the multiplicity, i.e. to the total number of electron–positron pairs produced by the electromagnetic field of the ions, whereas the calculation of the single pair production probability is much more involved. A critical observation concerns the unsolved problem of seemingly absent Coulomb corrections (Bethe–Maximon corrections) in pair production cross sections. It is shown that neither the inclusion of the vacuum–vacuum amplitude nor the correct interpretation of the solution of the Dirac equation concerning the pair multiplicity is able the explain (from a fundamental point of view) the absence of Coulomb corrections. Therefore the contradiction has to be accounted to the treatment of the high energy limit.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100520200891
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  • 2
    Digitale Medien
    Digitale Medien
    Bestäubungs-und Befruchtungsverhältnisse bei weißem Senf (Sinapis alba L.) (1940)
    Springer
    Theoretical and applied genetics 12 (1940), S. 189-193 
    Details
    ISSN: 1432-2242
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01886801
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  • 3
    Digitale Medien
    Digitale Medien
    Influence of damping on the excitation of the double giant resonance (2000)
    Springer
    The European physical journal 7 (2000), S. 55-58 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS: 24.10.Eq Coupled-channel and distorted wave models – 24.30.Cz Giant resonances – 25.70.De Coulomb excitation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We study the effect of the spreading widths on the excitation probabilities of the double giant dipole resonance. We solve the coupled-channels equations for the excitation of the giant dipole resonance and the double giant dipole resonance. Taking Pb+Pb collisions as example, we study the resulting effect on the excitation amplitudes, and cross sections as a function of the width of the states and of the bombarding energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500050011
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