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  • 1990-1994  (2)
  • 25.90  (1)
  • 61.80.f  (1)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    AstrophysicalS(E) factor of8Li (α,n 0)11B and inhomogeneous Big Bang nucleosynthesis (1990)
    Springer
    The European physical journal 337 (1990), S. 211-220 
    Details
    ISSN: 1434-601X
    Keywords: 24.30 ; 25.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The cross section of the11B(n, α)8Li reaction has been measured atE n=7.6 to 12.6 MeV. The neutron beam was produced via theD(d, n)3He reaction and aBF 3 counter (with naturalB isotopic composition) served both as target for the11B nuclides and as detector for the observation of the delayedα-activity of8Li. The data match well with previous results obtained atE n =12.5 to 20.0 MeV. Using the principle of detailed balance the data were converted to the case of the8Li(α, n 0)11B reaction. The associated astrophysicalS(E) factor is dominated by a resonance atE R=0.58 MeV of widthΓ R =200 keV, withS(E R )=8400 MeV b. ThisS (E R ) value for the n0 channel alone is already three times higher than the constantS(E) factor assumed previously and, thus, strengthens the significance of inhomogeneous Big Bang nucleosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294294
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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