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  • 1985-1989  (6)
  • 25.70  (4)
  • 25.70.−z  (2)
  • Organic Chemistry
  • Polymer and Materials Science
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Material
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Electromagnetic probes of nuclear collisions at intermediate energy (1985)
    Springer
    The European physical journal 321 (1985), S. 589-592 
    Details
    ISSN: 1434-601X
    Keywords: 34.50.Fa ; 25.70.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that emission of high-energy electrons and photons in nuclear collisions at intermediate energies is sensitive to the space-time evolution of the reaction. The electron and photon spectra measure related but complementary quantities connected with the nuclear charge distribution. We show that at 60 MeV/u beam energy production of 50 MeV electrons is predicted to measurable probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432434
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Coherent photon production in heavy-ion collisions at intermediate energies (1988)
    Springer
    The European physical journal 330 (1988), S. 315-318 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied photon production in heavy-ion collisions at intermediate energies in the Molecular Dynamics approach, where the radiation amplitudes have been derived from the many-body dynamics in the classical bremsstrahlung formalism. This concept allows for a comparison of cross sections obtained by coherent and incoherent summation of amplitudes. The numerical results show a significant enhancement of the coherent cross section for photon energies below 40 MeV due to the dynamical influence of the nuclear mean field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294876
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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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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Models for new particle production in nuclear collisions (1986)
    Springer
    The European physical journal 324 (1986), S. 243-259 
    Details
    ISSN: 1434-601X
    Keywords: 13.90 ; 14.80 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following up our earlier work and also stimulated by recent experimental results on positron production in heavy ion collisions we investigate various mechanisms for the production of a light, previously unknown particle in such collisions. As more conventional mechanisms seem to be inadequate we concentrate on processes directly or indirectly connected with the strong electric or magnetic fields and quark degrees of freedom in nuclei. We also consider modifications of the color confinement scheme. Our analysis is confined to schemes staying within the framework of the standardSU(3)c ×SU(2)×U(1) model. Since most of the possibilities discussed can be rejected, severe modifications of basic concepts of particle physics seem to be required if the production of a new particle is confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294578
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    MO-radiation interference phenomena as a “clock” for nuclear reaction times (1986)
    Springer
    The European physical journal 1 (1986), S. 47-50 
    Details
    ISSN: 1434-6079
    Keywords: 34.50 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molecular orbitalK x-rays emitted during Pb+Pb collisions are investigated. Two results are presented: A slight filling up of the minimum observed in the differential radiation cross-section is given by radiative transitions from theM-shell to theL-shell. The minima are shifted with increasing nuclear contact times to higher photon energies. The observation of the shift allows the estimation of the sticking time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384657
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    Paper (German National Licenses)
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  • 6
    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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    Paper (German National Licenses)
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