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  • 11
    Electronic Resource
    Electronic Resource
    The beta strength function and the astrophysical site of ther-process (1981)
    Springer
    The European physical journal 299 (1981), S. 213-229 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The beta strength function has been calculated for ∼6000 nuclei between the line of beta stability and the neutron drip line. The calculations — performed by using a schematical Brown-Bolsterli model — yield more reliable beta decay half lives,P n values andβ-delayed fission rates than the strongly oversimplified assumptions on Sβ used up to now in astrophysical calculations. The calculated beta rates are shown in this paper to be decisive in the discussion of the problem of the astrophysical site of ther-process, which is responsible for the production of the heavy elements in the universe. In particular we concentrate on the neutron capture processes during the explosive burning of He in massive stars, initiated by the outgoing shock wave from a supernova explosion. It is shown that as consequence of the revisedβ-decay rates explosive He-burning represents a very convincing alternative scenario to the classicalr-process, which avoids the presently existing problems of the latter: 1. The computed relative abundances ofr-nuclei resemble on the average their solar system counterparts. 2. The calculated abundance peaks essentially coincide in position with the observed ones. 3. The new site of ther-process avoids the problems of overproduction of heavy elements and of the mass-cut. Our results are based on realistic stellar models and hydrodynamical explosion calculations which for the first time are applied here to the problem of heavy element nucleosynthesis. The results turn out to be rather insensitive to the details of those models. The shorterβ-decay half lives obtained are of importance also in the investigation of further astrophysical sites producing heavy elements such as then-processes in explosive C or Ne burning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443939
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  • 12
    Electronic Resource
    Electronic Resource
    Origin of the odd-even staggering in theA≃80 solarR-abundance peak (1990)
    Springer
    The European physical journal 336 (1990), S. 357-358 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In contrast to the conventional picture, the r-process yields in the A≃80 abundance peak exhibit a pronounced odd-even staggering. It is proposed that this behaviour may be due to strong β-delayed neutron branching from a few odd-mass isotopes located in or close to the r-process path.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292869
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Neutron star models and nuclear forces (1971)
    Springer
    The European physical journal 246 (1971), S. 60-70 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Equations of state of cold neutron matter are calculated by the method of unitary transformations for a hard-core and a soft-core potential. Equilibrium configurations are constructed in the Newtonian and the general relativistic theory of gravitation. It is found that Newtonian treatment to a certain extent gives very good results. On the other hand neutron star models are strongly affected by the nuclear forces used in the equation of state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402651
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  • 14
    Electronic Resource
    Electronic Resource
    The beta-decay half-life of 48 130 Cd82 and its importance for astrophysicalr-process scenarios (1986)
    Springer
    The European physical journal 325 (1986), S. 489-490 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ß-decay half-life of130Cd has been measured and its importance as N=82 ‘waiting-point’ nucleus for astrophysical rapid neutron capture (r−) process scenarios is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290055
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  • 15
    Electronic Resource
    Electronic Resource
    Neutron stars and incompressible fluid spheres in the Jordan-Brans-Dicke theory of gravitation (1974)
    Springer
    General relativity and gravitation 5 (1974), S. 663-672 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron stars and incompressible fluid spheres are considered in the Jordan-Brans-Dicke theory. It is shown that their parameters (mass, radius, surface redshift) do not differ appreciably from the corresponding Einstein values even for ω = 0and various semi-realistic equations of state. For incompressible fluid spheres the differences between both theories of gravitation are most pronounced. We find an apparent instability of the incompressible fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00761924
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