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  • 25.40  (2)
  • 25.55.−e  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Electron screening in thed+3He fusion reaction (1994)
    Springer
    The European physical journal 350 (1994), S. 171-176 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.−e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross section measurements of thed(3He,p)4He reaction have been extended to an energy as low asE cm =5.4 keV. The data have an improved accuracy compared with previous work and confirm the existence of electron screening. The combined analysis of the present and previous data leads to an electron screening potential ofU e =123 ± 9 eV. A similar analysis of previous data for3He(d, p)4He leads toU e =186 ± 9 eV. Both screening potentials differ due to the molecular and atomic aggregate state of the targets involved in these investigations and are significantly larger than expected from available atomic physics models, supporting the general trend in studies of electron screening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290685
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oppenheimer-Phillips effect and electron screening ind+ d fusion reactions (1995)
    Springer
    The European physical journal 351 (1995), S. 107-112 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.−e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thed(d, n) 3He andd(d,p)t fusion reactions have been studied at center-of-mass energies E=1.6 to 130 keV using intense beam currents from 30, 100, and 450 kV accelerators in combination with detectors in close and far geometry. The cross sesction ratio,R(E)=σ(d,n)/σ(d, p), approaches unity (within 2%) at low energies; thus there is no experimental evidence for the Oppenheimer-Phillips effect at subcoulomb energies. The cross sections of d(d, p)t at E≦10keV show clear evidence for electron screening effects. However, the observed cross section enhancement is significantly larger than can be accounted for from available atomic physics models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292792
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    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
    Keywords: 25.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289534
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    Paper (German National Licenses)
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