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  • Articles  (8)
  • 78.70  (8)
  • 1985-1989  (8)
  • 1950-1954
  • 1987  (8)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (8)
  • Technology
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  • Articles  (8)
Source
Keywords
Publisher
Years
  • 1985-1989  (8)
  • 1950-1954
Year
Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (8)
  • Technology
  • Physics  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Applications of accelerator-based low-energy positron beams in atomic physics (1987)
    Springer
    Applied physics 43 (1987), S. 235-245 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 34.90 ; 36.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Applications of LINAC-based positron beams in atomic physics are described. The following broad subject areas are treated; e+ mobility and momentum transfer cross section determinations, angularly resolved and integral cross sections for e+-atomic processes plus charge transfer (Ps formation) type experiments, experiments with tunable positronium beams and experiments with thermal Ps sources. In addition, some discussion is given concerning the use of channel electron multiplier arrays (CEMAs) in conjunction with charge coupled devices (CCDs) as position sensitive detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635178
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  • 2
    Electronic Resource
    Electronic Resource
    A high-intensity58Co slow-positron beam and applications to probe near-surface disorder (1987)
    Springer
    Applied physics 43 (1987), S. 269-274 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 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 Properties and performance of a magnetically-guided, high-intensity, ultra-high-vacuum slow-positron beam are reviewed. Basic positron behaviour in solids is briefly described. Results from various58Coβ + sources in conjunction with a backscattering W(110) moderator are presented. We discuss research applications to probe depth distribution of open-volume lattice defects. Two experimental methods capable of yielding information on defects within ∼500 Å and ∼1 μm from the surface, respectively, are considered. Results are shown on defect distribution in ion implanted metals and semiconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635182
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  • 3
    Electronic Resource
    Electronic Resource
    Antihydrogen formation through positron-antiproton radiative combination (1987)
    Springer
    Applied physics 43 (1987), S. 287-293 
    Details
    ISSN: 1432-0630
    Keywords: 07.77 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper the production of a beam of antihydrogen atoms through the capture of positrons by antiprotons in an arrangement of merged parallel beams is considered. The achievable luminosity is estimated on the basis of available antiproton and positron intensities. The scaling of the luminosity with various parameters is investigated. It is argued that an intense beam of antihydrogen can be obtained if antiprotons and positrons are stored, recirculated and cooled. While the number of stored antiprotons which can be achieved at present is already high, schemes for the accumulation of slow and cooled positrons have to be developed. Possible ways are pointed out. The fact that a high number of both species of charged particles can be accumulated, stored, and recirculated, compensates largely for the low capture cross-section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635185
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  • 4
    Electronic Resource
    Electronic Resource
    Positron-lifetime study of vacancy annealing in neutron-irradiated GaAs (1987)
    Springer
    Applied physics 42 (1987), S. 125-127 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron-lifetime measurements have been used to study the annealing of vacancies in neutron-irradiated GaAs. The vacancies which are interpreted as defects in the Ga sublattice disappear in a single annealing stage (at 500°C in GaAs doped with Si or Zn, and at 600°C in Cr-doped GaAs).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616721
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  • 5
    Electronic Resource
    Electronic Resource
    A field-assisted moderator for low-energy positron beams (1987)
    Springer
    Applied physics 42 (1987), S. 111-116 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 72.90 ; 79.90
    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 new positron field-assisted (FA) moderator based on the drift of positrons across a cooled silicon crystal is proposed. Using estimates for both theβ + implantation profile and attainable drift velocities, the efficiency of drift to a slow e+ emitting surface is calculated using a diffusion equation which incorporates terms describing positron drift and annihilation. It is conjectured that efficiencies of up to 10% can be achieved. The use of epitaxially grown metallic suicide contacts to facilitate the application of the electric field is described and the consequences of using such contacts are fully discussed. Applications of the FA transmission mode moderator described here to produce timed brightness enhanced beams are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616719
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrathin-layer (AlAs) m (GaAs) m superlattices withm = 1,2,3 grown by molecular beam epitaxy (1987)
    Springer
    Applied physics 43 (1987), S. 75-79 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 78.65 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ultrathin-layer (AlAs) m (GaAs) m superlattices withm = 1, 2, and 3 were grown by molecular beam epitaxy and characterized by x-ray diffraction and photoluminescence measurements. The appearance of distinct satellite peaks around the Bragg reflections demonstrate the formation of high-quality layered crystals. The observed luminescence shows a maximum at 2.033 eV form = 3, and the emission energy decreases form = 2 andm = 1 as well as for them = 4 superlattice. This result for the monolayer superlattice is in good agreement with recent theoretical calculations, and it shows that the (AlAs)1(GaAs)1 superlattice represents a new artificial semiconductor material with novel electronic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615210
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  • 7
    Electronic Resource
    Electronic Resource
    Positron annihilation study of ordering processes in rare-earth cobalt permanent magnets (1987)
    Springer
    Applied physics 42 (1987), S. 287-289 
    Details
    ISSN: 1432-0630
    Keywords: 75 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The ordering process in 1/5 and in 2/17 Sm-Co permanent magnets was followed by positron annihilation lifetime and Doppler broadening measurements. No correlation between magnetic hardness and positron annihilation parameters was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616564
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  • 8
    Electronic Resource
    Electronic Resource
    The positron beam at the stuttgart pelletron accelerator and its applications toβ +γ positron lifetime measurements (1987)
    Springer
    Applied physics 43 (1987), S. 261-267 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 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 A slow-positron source has been installed in the therminal of an electrostatic 6.5 MeV accelerator and provides a monoenergetic positron beam in the few-MeV range. It will be used to operate a “fast” positron lifetime spectrometer based onβ + γ coincidences. The properties of the beam, the expected performance of the spectrometer, its advantages over conventionalγγ lifetime measurements, a number of intended applications, as well as recent positron-electron scattering experiments and plans for positron channelling and channelling-radiation studies are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635181
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