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  • Articles: DFG German National Licenses  (4)
  • 1985-1989  (4)
  • 27.10  (3)
  • 25.70  (1)
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  • Articles: DFG German National Licenses  (4)
Material
Years
  • 1985-1989  (4)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The cross section of14N(n, p)14C at stellar energies and its role as a neutron poison forS-process nucleosynthesis (1988)
    Springer
    The European physical journal 330 (1988), S. 167-172 
    Details
    ISSN: 1434-601X
    Keywords: 95.30.C ; 97.10.C ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absolute average cross section 〈σ〉 of the14N(n, p)14C reaction has been measured using neutron spectra that closely resemble Maxwell-Boltzmann distributions with thermal energies of kT=25.0 and 52.4 keV: 〈σ〉=0.81±0.05 and 0.52±0.06 mb, respectively. The resulting reaction rates are nearly the same at T9=0.29 and 0.61, and their average, NA〈συ〉=(1.3±0.1)×105 cm3 s−1 mol−1, is about a factor of three smaller than the previously adopted values obtained by extrapolation between thermal and higher-energy data. Thus, the14N(n, p)14C reaction plays a correspondingly smaller role as a neutron poison fors-process nucleosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293392
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Absolute cross section of the3He(α,γ)7Be reaction (1988)
    Springer
    The European physical journal 329 (1988), S. 243-254 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.-e ; 27.10 ; 27.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absolute cross section σ(E) of the3He(α, γ)7Be reaction has been measured fromE c.m. =195 to 686 keV. The studies employed both a supersonic jet gas target and an extended gas target, and were carried out by the observation of the prompt capture γ-ray transitions as well as the7Be residual nuclei. The absolute cross sections deduced from the capture γ-rays are in good agreement with most previous work and remove a discrepancy with other earlier work. In comparison, the σ(E) values obtained from the7Be residual nuclei are systematically higher, suggesting a small production of additional7Be by contaminant reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283781
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of theD and6Li quadrupole moments on theD(α,γ)6Li stellar reaction rate (1986)
    Springer
    The European physical journal 325 (1986), S. 193-196 
    Details
    ISSN: 1434-601X
    Keywords: 23.20 ; 27.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied theD(α, γ)6Li reaction at stellar energies within a potential model. Our calculation improves previous investigations as we explicitely take into account the internal quadrupole moment of the deuteron and ad-state component in the6Li ground state. We reproduce the experimental data for energiesE〈3 MeV. We find, however, that our improvements represent only minor corrections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289650
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Resonant and intrastate transitions to the 2+ state in8Be (1986)
    Springer
    The European physical journal 324 (1986), S. 307-310 
    Details
    ISSN: 1434-601X
    Keywords: 23.20 ; 27.10 ; 21.60G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied resonant, intrastate and non-resonant bremsstrahlungγ-ray transitions leading to the 2+ state in8Be atE x=2.94 MeV. We find aγ-width of Γ γ =0.45 eV for the 4+ state in8Be, corresponding to anE 2 strength of 19 W.u. For the intrastateγ-ray transition within the 2+ resonance we predict a maximum cross section of 2.5 nb atE≈3.3 MeV. An experimental observation of this novel type ofγ-ray emission, however, appears to be difficult due to the dominance of competing resonant and direct capture processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294584
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    Paper (German National Licenses)
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