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  • 25.40  (2)
  • 12.40.Qq  (1)
  • 14.40.Cs  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 25.40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01293350
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The S(E) factor of7Li(p, γ)8Be and consequences for S(E) extrapolation in7Be(p, γ0)8B (1995)
    Springer
    The European physical journal 351 (1995), S. 229-236 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Excitation functions and forward-backward anisotropies have been measured for the7Li(p, γ)8Be capture reaction over the proton energy rangeE p =100 to 1500 keV, using a 4π summing crystal and Ge(Li) detectors, respectively. The data show at all energies the presence of El and M1 capture amplitudes arising from the direct capture (DC) process and theE R =441 and 1030 keV resonances, respectively. Due to the observed DC process, the present data increase significantly the reaction rates (up to a factor of 110) compared to values given in the compilation. The data and their analyses remove the recent criticism on DC model calculations, which had implied a significant reduction in the extrapolated S(E) factor for7Be(p,γ)B and thus in the predicted flux of high-energy solar neutrinos; thus, the solar neutrino problem is still with us.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289534
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 12.40.Qq ; 13.25.+m ; 14.40.Cs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289827
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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