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  • 11
    Electronic Resource
    Electronic Resource
    The impact parameter dependence of the K MO X-ray emission in208Pb +208Pb collisions (1984)
    Springer
    The European physical journal 319 (1984), S. 239-251 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The emission probabilities for quasimolecular K-x-radiation (K-MOR) have been measured in208Pb +208Pb collisions at 4.3 MeV/u and 4.8 MeV/u as a function of the scattering angle using the particle-photon-coincidence technique. The probabilities exhibit a superposition of two exponential slopes with different fall-off constants. We identify the sharp fall off at very small impact parameters (〈60 fm) with the K-MOR contribution from the decay of 1sσ-vacancies. The flatter slope for impact parameters larger than 60 fm is attributed to the radiative decay of holes in 2p 1/2 σ molecular states. In this way, experimental “1sσ-MOR-emission probabilities” could be extracted and compared with theory. For 4.3 MeV/u the1sσ- and 2p 1/2 σ-excitation probabilities could also be determined and have been compared to coupled-channel calculations and to a scaling law for 1sσ excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412536
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  • 12
    Electronic Resource
    Electronic Resource
    Recombination of U 92 + ions with electrons (2001)
    Springer
    The European physical journal 15 (2001), S. 145-154 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 34.80.Lx Electron-ion recombination and electron attachment – 29.20.Dh Storage rings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Recombination of fully stripped U92+ ions with electrons has been investigated at the Experimental Storage Ring (ESR) in Darmstadt. Absolute recombination rate coefficients have been measured for relative energies from 0 to 33 eV. For energies greater than 20 meV the experimental result is well described by the theory for radiative recombination (RR). Below 20 meV the experimental rate increasingly exceeds the RR calculation as observed previously in the recombination of light bare ions as well as of Bi83+. This low-energy rate enhancement is shown to scale as Z2.6 for bare ions, where Z is the atomic number of the ion. The U92+ recombination rate enhancement is insensitive to changes of the electron density. Variation of the magnetic guiding field strength from 80 mT to 120 mT resulted in oscillations of the recombination rate at 0 eV. The oscillations are partly attributed to changes of the transverse electron temperature accompanying the change of the magnetic guiding field strength; partly they may be caused by uncompensated small changes of the interaction angle between the two beams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170160
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    Paper (German National Licenses)
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