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  • Articles  (18)
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  • 78.70
  • 1985-1989  (18)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (18)
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  • Articles  (18)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (18)
  • Physics  (23)
  • 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
    Analysis of UV-Laser induced oxidation of implanted silicon by optical reflectivity measurements (1988)
    Springer
    Applied physics 47 (1988), S. 255-258 
    Details
    ISSN: 1432-0630
    Keywords: 81.60 ; 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 The oxidation of ion implanted silicon induced by a repetitive excimer laser working in liquid phase regime has been monitored by a simple in situ technique. It consists to follow the optical reflectivity at the wavelength 633 nm of the silicon samples under irradiation. The influence of implantation and laser irradiation conditions on the oxidation process has been investigated by this technique. The results obtained have been compared using infrared absorption data. The role of the Si/SiO2 interface roughness on the oxide film quality has been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615931
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  • 6
    Electronic Resource
    Electronic Resource
    Experimentation with thin single crystal W foils as slow positron transmission mode moderators (1988)
    Springer
    Applied physics 47 (1988), S. 409-412 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 81.40 ; 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 Results are reported on the performance of single crystal W foils as positron moderators. A simple annealing technique has been developed which gives efficiencies comparable to those obtained by in situ heating under high vacuum conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615506
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  • 7
    Electronic Resource
    Electronic Resource
    Possibility of enhancement of slow positron emission (1985)
    Springer
    Applied physics 36 (1985), S. 47-49 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 82.65
    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 possibility to apply directional action of a metal-metal junction on positron diffusion motion has been shown to increase the slow positron reemission from a metallic moderator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616460
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  • 8
    Electronic Resource
    Electronic Resource
    Experimentation with thin single crystal W foils as slow positron transmission mode moderators (1988)
    Springer
    Applied physics 47 (1988), S. 409-412 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 81.40 ; 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 Results are reported on the performance of single crystal W foils as positron moderators. A simple annealing technique has been developed which gives efficiencies comparable to those obtained by in situ heating under high vacuum conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615506
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  • 9
    Electronic Resource
    Electronic Resource
    Time and temperature dependent three-quantum annihilation and lifetime of positronium in alumina powder (1989)
    Springer
    Applied physics 48 (1989), S. 343-346 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 82.65
    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 relative three-quantum yieldP 3 and the lifetime of ortho-positronium generated by alumina fine powders were studied as a function of temperature and of time. A strong variation in theP 3 value and a constant value of the long lifetime component are interpreted as the existence of two positronium states, one in the interparticle free volume, the second as positronium absorbed to the surface. The latter state is quenched by surface impurities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618896
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature characteristics of positron trapping at defects in electron-irradiated silicon (1989)
    Springer
    Applied physics 49 (1989), S. 659-664 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 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-annihilation lifetime and Doppler-broadening measurements are used to investigate defects in silicon irradiated at 373 K with 6 MeV electrons to a dose of 1×l019e/cm2. In the unirradiated silicon sample (p type) a temperature-independent behaviour of the bulk-lifetime is observed in the temperature interval 110–500 K with a constant value of 220±1 ps. The slight effect observed on the S-parameter evolution is explained taking into account the thermal expansion of the lattice. The lifetime results obtained at 80 K and at 300 K after isochronal annealing as well as the behaviour of the intensity of the second lifetime componentI 2 during lifetime measurements below the irradiation temperature in the irradiated silicon sample (n type), clearly indicate the temperature dependent characteristics of the positron trapping cross section σt(T) ∝T n withn= −1.905±0.016. From isochronal annealing results, an annealing stage is observed in which di-vacancies agglomerate into quadri-vacancies. The mean positron lifetime in those quadri-vacancies is 350 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616990
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