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  • 1990-1994  (3)
  • 12.40.Qq  (1)
  • 25.40  (1)
  • 61.80.f  (1)
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    The effects of electron screening and resonances in (p, α) reactions on10B and11B at thermal energies (1993)
    Springer
    The European physical journal 345 (1993), S. 231-242 
    Details
    ISSN: 1434-601X
    Keywords: 25.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fusion reactions10B(p, α)7Be and11B(p, α)8Be have been studied over the c.m. energy range E=17 to 134 keV using intense proton beams and thick solid targets. In the case of11B(p, α)8Be the low-energy data in terms of the astrophysical S(E) factor show an exponential enhancement (up to a factor of 1.9) due to the effects of electron screening, where the deduced screening potential is larger than expected. In the case of10B(p, α)7Be the low-energy data exhibit an enhancement by more than a factor of 200, which cannot be explained by the effects of electron screening. The enhancement arises here from the high-energy tail of an expecteds-wave resonance at ER=10 keV. The results offer an improved prospect for this reaction as advanced fuel in future fusion reactors than previously envisioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293350
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radiation damage of mylar foils by a nuclear microprobe (1993)
    Springer
    The European physical journal 346 (1993), S. 309-318 
    Details
    ISSN: 1434-601X
    Keywords: 61.80.f ; 61.80.M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mylar foils have been irradiated under typicalPIXE conditions using the Bochum nuclear microprobe. The induced radiation damage was investigated with theHEIS technique for studies of the chemical composition and theSTIM technique for studies of the extent of axial and lateral damage. The data show that the current density of the microbeam influences the extent of axial and lateral damage in the foils, while the fluence of the microbeam causes changes in chemical composition: more than one-half of the originalH andO abundances are lost, while theC abundance — after a 15% drop within the first few seconds — increases slowly with fluence. Furthermore, the thickness of the foil affects the final chemical composition of the sample only at large fluences. The results indicate that some caution is necessary in the interpretation of PIXE analyses of trace elements in biological or medical samples using nuclear microprobes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292523
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Search for the 70 keV resonance in17O(p, α)14N (1992)
    Springer
    The European physical journal 343 (1992), S. 483-487 
    Details
    ISSN: 1434-601X
    Keywords: 12.40.Qq ; 13.25.+m ; 14.40.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A direct search for theE R =70 keV resonance in17O(p, α)14N was carried out using17O enriched Ta2O5 targets in combination with a 1 mA proton beam and suitable detectors of large solid angle. The observed upper limit for the resonance strength isωγ≤8×10−10 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289827
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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