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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
    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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  • 4
    Electronic Resource
    Electronic Resource
    T-violation experiments using Mössbauer transitions (1991)
    Springer
    The European physical journal 339 (1991), S. 305-310 
    Details
    ISSN: 1434-601X
    Keywords: 11.30.Er ; 23.20.−g ; 25.20.−x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyse the effects of time-reversal (T) violation on the transmission of photons through a system of magnetized foils that have a Mössbauer transition with comparableM1 andE2 strength (e. g.99Ru or197Au). We consider experiments that are true tests of T violation and therefore are not subject to effects from final-state interactions, discussing observables that probe either parity-violating or parity-conserving T-odd interactions. We propose a novel three-foil experiment sensitive to a T-odd, P-odd multipole admixture. This experiment should be insensitive to most systematic problems faced by the earlier experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284069
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    Paper (German National Licenses)
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