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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 5 (1999), S. 327-336 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The energy spread of atomic and molecular ion beams from the 4 MV Dynamitron tandem accelerator at the Ruhr-Universität Bochum has been studied and in part minimized. Using the ER= 6.40 MeV narrow resonance in 1H(15N,αγ)12C with an 15N energy spread of 4.55 keV, the Doppler broadening for several hydrogen-bearing gases was found to be in good agreement with expectation: e.g. for NH3 gas a rotational-vibrational Doppler width of 10.41 ± 0.25 keV was observed (theory = 10.4 keV). Studies of the vibrational Doppler widths of H-bonds on a Si 〈100〉 surface were performed using a 4πγ-ray detection system together with UHV-chambers for sample preparation, transport, and analysis. The results showed that further improvements in the experimental set-ups are needed for such investigations.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: PACS. 25.40.Lw Radiative capture – 25.40.Ny Resonance reactions – 29.40.Mc Scintillation detectors – 27.30.+t 20 ?A? 38
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The 27Al(p,γ)28Si reaction has been investigated using two different 4π NaI summing detectors. The strength of 26 resonances in the energy range from 200 to 1120 keV has been measured. In addition, yield measurements have been carried out at 9 beam energies in the 490 to 1150 keV range in order to determine the direct capture cross-section. The existing data on the non-resonant mechanism were analysed and combined with the results of the present work. The resulting resonance strengths as well as the deduced direct capture astrophysical S-factor are compared with previous work.
    Type of Medium: Electronic Resource
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