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  • 1975-1979
  • 1970-1974  (6)
  • 1974  (6)
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  • 1975-1979
  • 1970-1974  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 129-137 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations of Ternary Chalkogenides. XXIII. On the Structure of the Tl0,33TaSe2 - PhaseThe system Tl/Ta/Se, at low thallium concentrations gives rise to a phase with the empirical formula TlxTaSe2, in which x has values between 0.33 and 0.5. It crystallizes hexagonal (a = 3.473 Å; c = 8.393 Å; c/a = 2.42) with one formula weight per unit cell. The structure of this phase (space group D3h1-P6m2) consists of TaSe2 layers between which the thallium atoms are arranged in such a way, that both metals attain a trigonal-prismatic coordination concerning the selenium atoms. The interatomic distances as well as bonding resulting from them and the relations of this structure with similar structure types are discussed.
    Notes: Im System Tl/Ta/Se bildet sich bei kleinen Thalliumgehalten eine Phase der Zusammensetzung TlxTaSe2 mit x zwischen 0,33 und 0,5. Sie kristallisiert hexagonal mit a = 3,473 Å; c = 8,393 Å; c/a = 2,42 mit einer Formeleinheit in der Elementarzelle. Die Struktur dieser Phase (Raumgruppe D3h1-P6m2) baut sich aus TaSe2-Schichten auf, zwischen denen die Thalliumatome so eingelagert sind, daß sich für beide Metalle eine trigonal-prismatische Koordination gegenüber den Selenatomen ergibt. Die interatomaren Abstände, die sich daraus ergebenden Bindungsverhältnisse sowie die Beziehungen dieser Struktur zu ähnlichen Strukturtypen werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1974-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 3
    Publication Date: 2019-06-27
    Description: The generation and detection of transition radiation have been studied in a series of experiments with electrons from 1 to 15 GeV at SLAC and at the Cornell Synchrotron. Periodic radiators, consisting of thin plastic foils stretched in air at constant spacings, were used, and proportional chambers filled with krypton or xenon served as detectors. A detailed discussion of the theoretical predictions is given, and the measurements are systematically compared with the predictions by varying the most critical parameters, such as configuration of radiators and detectors, and energy of the electrons. In general, good agreement between theory and experiment has been found. On the basis of these results, the criteria are summarized under which transition radiation can readily be observed.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review D - Particles and Fields; vol. 10
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: A system of transition radiation detectors has been constructed and exposed to beams of electrons and pions in the energy range of 3 to 15 GeV at SLAC. Transition radiation was generated in a variety of stacks of mylar foils (radiators), and its intensity was detected with 7 multiwire proportional chambers. The raw data demonstrate a good separation between electron and pion induced signals. A more detailed analysis shows that a very efficient identification of individual particles is possible. Typically, a detection efficiency for electrons above 90%, combined with a pion-electron discrimination ratio of .001, has been achieved. Some conclusions with respect to the design of a practical detector for relativistic particles are drawn.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
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  • 5
    Publication Date: 2019-07-13
    Description: Recent measurements of the nuclear cosmic ray composition up to 100 GeV/n and of the spectrum of cosmic ray electrons to almost 1000 GeV have provided new evidence relevant to the origin of these particles and to their propagation in the interstellar medium. It was shown that the abundance of galactic daughter nuclei decreases with increasing energy relative to the abundance of parent nuclei. It was also found that the energy spectrum of electrons is consistent with a single power law up to 1000 GeV without much steepening. These results are possibly related, and the present work discusses them in terms of (1) a relatively local origin of energetic cosmic rays, (2) an extragalactic origin of the cosmic radiation, and (3) an energy dependent confinement of galactic cosmic rays.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
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  • 6
    Publication Date: 2019-07-13
    Description: A counter telescope has been exposed in three balloon flights in 1970 to measure the flux and energy spectrum of cosmic ray electrons between 10 and 1000 GeV. This instrument has been modified by incorporating a large area CsI crystal as well as highly efficient time of flight circuitry, and was flown again twice during 1972. The methods of data analysis are based on extensive accelerator calibrations at SLAC. The resulting electron spectrum fits well to a single power law with an index (gamma) equal to 2.66 over the whole energy region. No obvious steepening can be observed, although statistical uncertainties prohibit definite claims beyond 250 GeV.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
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