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  • 07.77  (1)
  • 12.20.Fv  (1)
  • 72.80  (1)
  • Acute myeloid leukemia  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Amorphous hydrogenated silicon studied by positron lifetime spectroscopy (1986)
    Springer
    Applied physics 40 (1986), S. 145-149 
    Details
    ISSN: 1432-0630
    Keywords: 71.60 ; 72.80 ; 78.70 Bj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon (a-Si:H) prepared by dc glow discharge in silane was investigated by positron lifetime measurements at room temperature. The lifetime spectrum shows considerably longer lifetimes than in simultaneously measured Si single crystals. The dominant component with the time constantτ 2=402 ps is discussed thoroughly in conjunction with positron trapping at microvoids containing more than 10 to 15 vacancies. Positron trapping at H-saturated dangling bonds cannot be ruled out. The long-lived component withτ 3=1800 ps (I 3=0.06) indicates positronium formation at larger voids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617395
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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zytochemisch und ultrastrukturell nachweisbare ringförmige Einschlüsse bei akuter myeloischer Leukämie (1981)
    Springer
    Annals of hematology 43 (1981), S. 15-24 
    Details
    ISSN: 1432-0584
    Keywords: Acute myeloid leukemia ; Ring-shaped inclusions ; Cytochemistry and ultrastructure ; Akute myeloische Leukämie ; ringförmige Einschlüsse ; Zytochemie und Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Zellen einer akuten, vorwiegend promyelozytär differenzierten Leukämie wurden lichtmikroskopisch und elektronenmikroskopisch ringförmige Einschlüsse nachgewiesen. Unter aggressiver Chemotherapie ließ sich eine Vollremission erzielen. Es wird diskutiert, inwieweit diese morphologischen Besonderheiten eine Bedeutung für die Einordnung des Krankheitsbildes haben.
    Notes: Summary In cells of an acute, predominantely promyelocytic differentiated leukemia ring-shaped inclusions could be demonstrated by light- and electronmicroscopic examinations. The patient showed good response to aggressive chemotherapy with complete remission. It is discussed, how far the presence of these morphological characteristics will have any bearing on the classification of this variety of leukemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319927
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy (1988)
    Springer
    The European physical journal 330 (1988), S. 173-181 
    Details
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293393
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    Paper (German National Licenses)
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