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  • 1
    Electronic Resource
    Electronic Resource
    Production and use of low-energy, monoenergetic positron beams from electron LINACS (1987)
    Springer
    Applied physics 43 (1987), S. 247-255 
    Details
    ISSN: 1432-0630
    Keywords: 78.70BJ ; 07.77
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Low-energy intense positron beams derived from pair production can be made at high-energy electron linacs and such beams are in operation or under installation at several linac facilities. Using a pulsed position beam made at a 100 MeV electron linac, we have measured the intensity and velocity distribution of positronium emitted from materials by measuring the time-of-flight of annihilating positronium. The time-of-flight data are augmented by positron lifetime and angular correlation measurements performed with the beam. Positronium spectra have been measured for a number of metallic samples. Several new observations have been made including details of the energy distribution of positronium emission formed by a thermalized positron and a conduction electron and the production of positronium from energetic positrons scattered out of the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635179
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new positron source for positron annihilation lifetime experiments (1979)
    Springer
    Applied physics 18 (1979), S. 305-306 
    Details
    ISSN: 1432-0630
    Keywords: 06.60 ; 78.70 ; 71.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A method using ion-implantation of Na22 to produce source-sample systems applicable to positron annihilation lifetime experiments at elevated temperatures in metals is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885519
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ion implantation of58Co for positron-annihilation Doppler-broadening measurements (1981)
    Springer
    Applied physics 24 (1981), S. 67-69 
    Details
    ISSN: 1432-0630
    Keywords: 06.60 ; 78.70 ; 71.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A method using ion implantation of58Co to produce source-sample systems applicable to positron-annihilation Doppler-broadening experiments at elevated temperatures in metals is presented. In addition, a crucible and furnace assembly is described which has been used to study the solid and liquid states of Ni in conjunction with the present source-sample system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900401
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 169-173 
    Details
    ISSN: 1572-9605
    Keywords: La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730389
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    Paper (German National Licenses)
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