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  • 1990-1994
  • 1980-1984  (4)
  • 1982  (4)
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  • 1990-1994
  • 1980-1984  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The3He(α,γ)7Be reaction and the solar neutrino problem (1982)
    Springer
    The European physical journal 304 (1982), S. 307-332 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The capture reaction3He(α,γ)7Be has been investigated in the energy range ofE c.m. =107 to 1,266 keV. The4He or3He beams of up to 300 μA particle current were incident on3He or4He gas targets, respectively. The gas target systems were all of the windowless and recirculating type. Excitation functions have been obtained with the use of an extended-static gas target, while the measurements ofγ-ray angular distributions involved a quasi-point supersonic jet system. The determination of absolute cross sections has been carried out with both types of gas target systems. Theγ-ray yields in the3He(α,γ)7Be reaction were detected using 80 cm3 Ge(Li) detectors. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)=0.30±0.03 keV-b. This result reduces the calculated solar neutrino rate by a factor of 1.76.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421513
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The15N(p,α 0)12C reaction at stellar energies (1982)
    Springer
    The European physical journal 305 (1982), S. 325-333 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The15N(ρ, α0)12C reaction has been investigated in the energy range ofE p (lab)=78-810keV. The measurement of the excitation functions and α-particle angular distributions involved solid targets as well as a quasi-point supersonic jet gas target. The determination of absolute cross sections has been carried out with the gas target. The observed energy dependence of the total cross sections can be described in terms of two-level Breit-Wigner shapes including the resonances atE p (J π)=335(1−) and 1,028(1−)keV. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)= 65±4MeV-b. The angular distributions are asymmetric around 90° and require an additional amplitude in the reaction mechanism, which interferes predominantly with the 335 keV resonance. The origin of this background amplitude is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419081
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance strengths of some light nuclei (1982)
    Springer
    The European physical journal 305 (1982), S. 319-323 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The strengths of theE c.m.=324 and 829 keV resonances in19F(ρ, αγ)16O have been determined relative to the Rutherford elastic scattering cross section. With these values as standards, the strengths of theE c.m.=259, {pp143} (also 1,106) and 1,259 keV resonances in14N(ρ, γ)15 O,18O(ρp, γy)19F and14N(α, γ)18F were measured, respectively. In addition, the cross section of the direct capture process in16O(ρ, γ)17F atE c.m.=853 keV has been obtained. All measurements were carried out by interchanging the role of projectiles and target nuclei, i.e.14N,16O,18O and19F ion beams of appropriate energies were guided into windowless gas target systems filled with hydrogen or helium gas. The results are compared with previous work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419080
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The4He(12C, γ)16O reaction at stellar energies (1982)
    Springer
    The European physical journal 308 (1982), S. 73-94 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The capture reaction4He(12C, γ)16O (E c.m.= 1.34–3.38 MeV) as well as the elastic scattering process4He(12C,12C)4He (E c.m.=1.44–3.38 MeV) have been investigated with the use of an intense12C beam and a windowless and4He recirculating gas target system. The measurements involved two large NaI(T1) crystals in close geometry to an extended gas target, whereby angle-integrated γ-ray yields were obtained. A large area plastic detector was used for the suppression of time-independent background. A search for cascade γ-ray transitions was carried out by coincidence techniques. The measurement of absolute cross sections is also reported. Theoretical fits of the excitation function for the groundstate γ-ray transition requireE1 as well asE2 capture amplitudes, which are of equal importance at stellar energies. This result increases significantly the stellar burning rate of4He(12C, γ)16O and leads to16O as the dominant product at the end of helium burning in massive stars. The observed capture yield to the 6.92 MeV state is dominated by the direct capture mechanism and plays a small role at stellar energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415851
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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