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  • 25.40  (2)
  • 25.90  (2)
  • 24.10.Eq  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Electromagnetic capture into theE x=7.56 MeV resonant state in15O (1987)
    Springer
    The European physical journal 327 (1987), S. 71-74 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20 ; 25.40 ; 25.88
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have studied the14N(p, γ)15O reaction leading into thej π=1/2+ resonance atE cm =260 keV in the proton channel. Our calculation is based on a potential model for nuclear bremsstrahlung allowing both fragments to have non-vanishing spins. Our study reproduces consistently the total width of the final resonance as well as the capture cross sections into this state thereby not confirming a contradiction between these two experimental data sets as discussed recently.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01295251
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of electron screening on low-energy fusion cross sections (1987)
    Springer
    The European physical journal 327 (1987), S. 461-468 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.90 ; 97.10.Cv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effects of electron screening on the low-energy cross sections of nuclear fusion reactions of astrophysical interest have been studied within the Born-Oppenheimer approximation using a simplified model. These studies indicate that a significant enhancement of the cross sections can occur already at beam energies, which are about a factor 100 higher than the electron binding energies. Cross sections near such energies can now be measured, in some cases, and several examples are discussed. For an understanding of the low-energy data as well as for a reliable extrapolation of the cross sections (for bare nuclei) to lower energies, the effects of electron screening must be well understood.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289572
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 24.30 ; 25.90
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294294
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The proton capture reactions on21Na and22Na under hydrogen burning conditions (1986)
    Springer
    The European physical journal 325 (1986), S. 309-315 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.40 ; 97.10
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have updated and recalculated the21Na(p, γ)22Mg and22Na(p, γ)23Mg reaction rates for temperatures 107–109 K relevant for explosive hydrogen burning in stellar environment. We find the21Na(p, γ)22Mg rate lower than recently suggested. Considering various uncertainties in spin and parity assignments of the low energy22Na+p resonances we present upper and lower limits for the22Na(p, γ)23Mg reaction rate which, however, allows for a meaningful discussion of the consequences of the new rates on the Ne - Na cycle under various stellar conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294614
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    The3He(d,p) α reaction at astrophysical energies (1989)
    Springer
    The European physical journal 333 (1989), S. 219-227 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Gx ; 25.55.-e ; 24.10.Eq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have performed a microscopic study of the3He(d,p) α reaction at astrophysical energies within the framework of the Resonating Group Method adopting three different effective nucleon-nucleon interactions. The calculations suggest that the low-energy3He(d,p) α cross section is in good approximation given by the contribution arising from the 3/2+ resonant state atE R =245 keV. In fact, the low-energy data can be better (and more physically) described by a single Breit-Wigner resonance parametrization than by a polynomial fit. Our fit to the3He(d,p) α cross section results in a noticeable reduction in the uncertainties of the resonance parameters of the 3/2+ resonant state as well as in a significantly improved extrapolation of the data to astrophysically important energies. On the basis of this extrapolation we were able to quantitatively deduce the enhancement of the low-energy cross section due to electron screening effects from the data of Krauss et al. and Engstler et al. These experimental enhancement factors were compared with various theoretical models which are all based on the Born-Oppenheimer approximation. As the models underestimate the observed enhancement we suggest that the theoretical study of electron screening effects requires a dynamical treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565154
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