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  • 1980-1984  (6)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Stopping of slow recoil atoms in gases (1981)
    Springer
    The European physical journal 301 (1981), S. 101-107 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear Resonance Fluorescence spectra contain information on the slowing-down behaviour of recoiling atoms in the energy range pertinent to the specific reaction. On the basis of conventional transport theory, measured spectra for arsenic atoms with energies ≲15 eV slowing down in helium are analysed. The assumption of continuous slowing down turns out to be well justified, and the thermal motion of the gas atoms is shown to influence the effective stopping power only slightly. Somewhat surprising in view of uncertainties concerning the charge state of the recoiling atoms, theoretical predictions based on Lenz-Jensen elastic interaction agree well with the measured spectra. At present, the experimental data do not allow direct inversion, but the calculated spectra are shown to depend sensitively on the stopping-power input.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419238
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear resonance fluorescence in238U and a new approach to Doppler-shift-attenuation using high speed rotation (1981)
    Springer
    The European physical journal 300 (1981), S. 43-46 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using56Co sources, a 3.254 MeV level in238U was photoexcited by aγ-line emitted in the decay of the 4.100 MeV level in56Fe. 10γ-transitions deexciting this 3.254 MeV level were identified. Spin and parity were determined to be 1−. By moving the56Co source in a high speed centrifuge the profile of the 3.254 MeV emission line was investigated. By applying a new variety of Doppler shift analysis a lifetime ofτ Fe=55±25fs was obtained for the 4.100 MeV level in56Fe. The cross section for nuclear resonance fluorescence yields a lifetime ofτ U =0.33±0.12 ps for the 3.254 MeV level in238U.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412613
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear photoexcitation and delbrück scattering studied in the energy range 2–8 MeV (1981)
    Springer
    The European physical journal 300 (1981), S. 193-203 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Elastic scattering by nuclei in the range of mass numbers between 64 and 238 has been studied with monochromatic photons in the energy range between 2 and 8 MeV. These photons were provided either by a Ti(n,γ) source installed in the tangential through channel of the Grenoble high flux reactor, or by24Na and56Co sources produced by deuteron bombardment of Al or Fe at the Göttingen cyclotron. The photoexcitation of 23 nuclear levels has been observed and the decay properties and groundstate widths of the majority of these levels have been determined. For the lead scattering target the coherent elastic differential cross section has been studied in detail. There is evidence that below the photo-neutron threshold the elastic scattering via virtual photoexcitation of the nucleus can be approximated by extrapolating the real part of the Giant Dipole Resonance amplitude along a Lorentzian curve. Coulomb corrections to Delbrück scattering seem to play a small role at 6.5 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412295
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear resonance scattering studies on238U using a dense series of γ-ray photons (1983)
    Springer
    The European physical journal 314 (1983), S. 171-179 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the181Ta(n, γ) and141Pr(n, γ) reactions to provide a dense series of intenseγ-rays, photoexcitation of the238U nucleus has been studied in the 4–7 MeV range. It is shown that most of the effective cross sections are in line with an average strength function as given by the GDR Lorentzian line superimposed by Porter-Thomas fluctuations. Resonances of nonstatistical strength are found close to 5.2 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01879875
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Nuclear resonance fluorescence in121Sb (1981)
    Springer
    The European physical journal 302 (1981), S. 61-62 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Usingγ quanta from a56Co source, resonance fluorescence from a 3,452 keV level in121Sb was observed. Four deexcitingγ transitions were identified. The profile of theγ emission line, investigated by means of a high speed centrifuge, yields with a novel variety of Doppler shift analysis a lifetime of τ4,298=(110±50)fs for theγ emitting 4,298 keV level in56Fe. The lifetime of the 3,452 keV level was determined to beτ 3,452 =(200±100)fs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425103
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The stopping of slow75As recoil atoms in He, Ne and H2 (1982)
    Springer
    The European physical journal 306 (1982), S. 301-306 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The slowing down of75As recoil atoms with energies ≲10eV in He, Ne and H2 was investigated by measuring Doppler-widened line profiles of the 265 keV gamma line emitted by the recoil nuclei. The line profiles contain information on the stopping powers of gases for heavy ions with initial velocities υ≲3·105 cms−1. They are analyzed in terms of the continuous slowing down theory developed by Falcone et al. The profiles observed with He and Ne are well described by assuming the stopping power to be based on Lenz-Jensen elastic interaction between recoil and moderator atoms. The profiles observed with H2 do not agree with predictions based on that interaction. The stopping power of H2 for the75As recoil atoms is found to be larger than that of He.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432370
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    Paper (German National Licenses)
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