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  • 1
    Digitale Medien
    Digitale Medien
    Neutral particle production in strong electromagnetic fields (1994)
    Springer
    The European physical journal 349 (1994), S. 47-51 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.40.−f ; 41.60.−m ; 14.80.Pb
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01296332
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Can extended objects explain the GSI e+ e− lines? (1991)
    Springer
    The European physical journal 340 (1991), S. 377-384 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 14.80.Pb ; 12.90.+b ; 23.20.Nx
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290325
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  • 3
    Digitale Medien
    Digitale Medien
    Hartree-Fock-calculation of parity-violation in cesium (1985)
    Springer
    The European physical journal 322 (1985), S. 539-545 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 12.30.Cx ; 32.70.−n ; 11.30.Er
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415132
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