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  • 1975-1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 290 (1979), S. 327-334 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angular distributions and integral cross sections for heavy reaction products from84Kr +238U collisions at 522 MeV were measured using catcher foil techniques and off-line X-ray identification of individual reaction product isotopes. There is no evidence for a fission-fusion mechanism being responsible for the formation of the “gold finger”. The data show that usual deep inelastic collisions account for the formation of all products with 70≦Z≦86. Compared to existing data atE≦605 MeV, the deduced mass distribution indicates reduced fission probabilities forZ≧80 fragments at 522 MeV. This is consistent with the expected dependence of fission probability on excitation energy and especially on angular momentum.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A search with radiochemical methods for long-lived superheavy elements in 238U targets bombarded with intense beams of136Xe ions produced negative results. A formation cross section of ≤1×10−35 cm2 is deduced at 95% confidence level for nuclides with half-lives between 1 and 200 d.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 272 (1975), S. 291-300 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After bombardments of enriched152Sm with 14-MeV neutrons, three isomers of125Pm reaction, have been observed with half-lives of 4.2±0.2 min, 7.5±0.2 min and 15.0±1.0 min. Sources of pure 4.2-min152Pm were obtained by separating the promethium from its parent 11-min152Nd produced by thermal-neutron induced fission of235U. The beta and gamma radiations of the 4.2-min152Pm have been investigated using semiconductor and scintillation spectrometers. Most of theγ-ray transitions could be placed in a level scheme for 152Sm. Especially interesting is a level at 1083 keV for which the assignmentI π=0+ is proposed. In a 4πβγ experiment, the ground state feeding of152Sm in theβ −-decay of the 4.2-min152Pm has been measured to be 61% of allβ-ray transitions. AQ β-value of 3.4±0.2 MeV has been obtained.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 49-57 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß eines Temperaturgradienten senkrecht zur Faserachse auf das Gefüge einer gerichtet erstarrten eutektischen 73C-LegierungDie thermische Stabilität einer gerichtet erstarrten eutektischen CoCrCAl-Legierung in einem Temperaturgradienten wird mit dem Verhalten unter isothermen Bedingungen verglichen.Zur Prüfung von gerichtet erstarrten Eutektika in hohem Temperaturgradienten und bei Temperaturen oberhalb 1300 K wurde eine Versuchseinrichtung entwickelt, die Experimente in unterschiedlicher Atmosphäre und im Vakuum ermöglicht. Die Versuche in diesem Gradienten-Ofen ergaben eine Vergröberung der Karbidfasern, die in dieser Legierung die Verstärkungsphase bilden. Durch die Umwandlung von Karbiden wird die Gefügestabilität beeinträchtigt.Diese Effekte werden in bezug auf isotherme Bedingungen diskutiert und ihre Auswirkungen auf die Anwendbarkeit dieser Legierung als Material für Hochtemperatur-Gas-Turbinen überprüft.
    Notes: The thermal stability of a directionally solidified (d. s.) eutectic CoCrCAl-alloy in a thermal gradient is compared to isothermal conditions.A device has been designed and constructed for examination of d. s. eutectics in high temperature gradients at temperatures above 1300 K in different atmospheres and vacuum.Experiments in this gradient furnace show coarsening of the carbide fibres forming the aligned strengthening phase. A microstructural instability resulting from the transformation of carbide fibres has been observed.These effects are discussed in relation to isothermal conditions and their implications on the applicability of the alloy as high temperature gas turbine blade material.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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