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  • 1
    Electronic Resource
    Electronic Resource
    Can extended objects explain the GSI e+ e− lines? (1991)
    Springer
    The European physical journal 340 (1991), S. 377-384 
    Details
    ISSN: 1434-601X
    Keywords: 14.80.Pb ; 12.90.+b ; 23.20.Nx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The anomalous electron-positron coincidences observed in heavy-ion collisions have been interpreted as signal for the pair decay of hitherto unknown neutral objects with masses around 1.8 MeV. We discuss the decay modes of such extended composite particles when they are bound to a nucleus. In particular we investigate the angular correlation of the emitted pair and the competing single-photon decay channel. We confront the particle hypothesis with recent negative results from experiments searching for resonances in Bhabha scattering. The induced pair decay of a metastable 1++ state in secondary collisions with target atoms is discussed as a possible explanation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290325
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Neutral particle production in strong electromagnetic fields (1994)
    Springer
    The European physical journal 349 (1994), S. 47-51 
    Details
    ISSN: 1434-601X
    Keywords: 13.40.−f ; 41.60.−m ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The sharp electron-positron coincidences observed at GSI are still unexplained. One possibility quite often discussed, is that a new neutral particle might be produced due to a direct highly non-linear coupling to the strong electro-magnetic fields encountered in heavyion collisions. We show that this is no valid possibility as the momentum spectrum resulting from any such coupling is incompatible with the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01296332
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bound states of composite particles and the GSI lines (1993)
    Springer
    The European physical journal 346 (1993), S. 133-136 
    Details
    ISSN: 1434-601X
    Keywords: 03.65.Ge ; 31.20.Di ; 12.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the correlated wave functions and the energy eigenvalues of a charged fermion-antifermion pair bound in the Coulomb field of a heavy nucleus, assuming a confining potential between the fermions. This model is motivated by properties of the coincident electron-positron lines observed at GSI. We confirm the results of earlier calculations which were based on simplifying assumptions. In addition we find new, very weakly bound states which, however, do not have the decay properties required to explain the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294628
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Two-particle bound states in the field of a heavy nucleus (1993)
    Springer
    The European physical journal 346 (1993), S. 137-141 
    Details
    ISSN: 1434-601X
    Keywords: 03.65.Ge ; 31.20.Di ; 12.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the wavefunction and the energy eigenvalues of two non-relativistic interacting particles in an external field with spherical symmetry. The techniques used and the formalism developed are suitable for all problems of this kind. We give explicit formulae for the matrixelements. As an example we discuss the case of a light charged fermion-antifermion pair in the Coulomb field of a heavy nucleus, assuming a confining potential between the fermions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294629
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  • 5
    Electronic Resource
    Electronic Resource
    Hartree-Fock-calculation of parity-violation in cesium (1985)
    Springer
    The European physical journal 322 (1985), S. 539-545 
    Details
    ISSN: 1434-601X
    Keywords: 12.30.Cx ; 32.70.−n ; 11.30.Er
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a relativistic Hartree-Fock calculation of the parity violatingE1-matrixelement of the 6s↔7s transition in cesium. Our resultE1= −8.4·10−12 iea 0 for sin2 θ w = 0.22 is in good agreement with the experimental value. We also give a general discussion of the consequences of a violation of discrete symmetries for the solutions of the Dirac equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415132
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    Paper (German National Licenses)
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