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  • 1980-1984  (7)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    High spin states in106in (1981)
    Springer
    The European physical journal 301 (1981), S. 29-34 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states have been investigated by the reaction90Zr(19F, 3nγ), using an Anticompton spectrometer device, for the nucleus106In, for which no in-beamγ-spectroscopic information was available up to now. A level scheme has been constructed up to anI =(13,14) state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412460
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Beta-delayed fission and neutron emission: Consequences for the astrophysicalr-process and the age of the galaxy (1983)
    Springer
    The European physical journal 309 (1983), S. 301-317 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Beta-delayed neutron emission and beta-delayed fission probabilities (P n andP β d j ) were calculated for neutron-rich nuclei between the beta stability line and the neutron-drip line in the range 10≦Z≦100 and 75≦Z≦100, respectively. These results were obtained by applying recentβ-strength function calculations, fission barrier height predictions, and a neutron optical potential from infinite nuclear matter calculations. An area of ∼100% fission probability is predicted around Z=94,N=168 extending beyond the well-known island of spontaneous fission in that region. Astrophysicalr-process calculations were performed including the calculatedP n and Pβ d f values. This puts the method to determine the age of the Galaxy by the actinide chronometers on a reliable basis. An excellent overall agreement with the observedr-abundance distribution is obtained. The predictedr-process production ratios for the Chronometrie pairs232Th/238U,235U/238U and244Pu/238U result in an age of the Galaxy oft G =(20.8± 4 2 )×109 a, which is by almost a factor two larger than earlier predictions by this method, but in accordance with recent astronomical observations from globular clusters. The predicted island of 100%β-delayed fission acts as a sink to ther-process with the consequence that no superheavy elements are produced in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413833
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-spin states in108Sn (1981)
    Springer
    The European physical journal 299 (1981), S. 105-111 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states in108Sn have been investigated using the92Mo(19F,p2nγ)108Sn reaction. In-beam measurements ofγ-γ-coincidences,γ-ray excitation functions andγ-ray angular distributions were performed with Ge(Li)-detectors, one of which had a Nal Compton suppression shield. A level scheme for108Sn has been constructed up to anI π=(14−) state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01440911
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    Paper (German National Licenses)
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Steady flow approximations to the heliumR-process (1983)
    Springer
    Astrophysics and space science 91 (1983), S. 221-234 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract R-process yields for a helium layer have been calculated within a network of 6033 heavy nuclei using a steady flow approximation. The calculation of the neutron capture cross sections has been improved. The beta decay rates computed by Klapdor and his colleagues have been used in the calculation. We find that ther-process yield peaks near mass numbers 80 and 130 require a neutron number density of approximately 1020 cm−3 and a freezing time comparable to or less than 0.1 s. The peak near mass number 195 requires a neutron number density of about 1021 cm−3 and a freezing time comparable to or less than about 0.01 s. The individual yield features of the steady flowr-process depend entirely upon the neutron capture cross sections of the nuclei along the flow path and the beta decay rates, which can shift the flow path and thereby introduce inappropriate capture cross sections into the determination of the yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656111
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Beta decay half lives of nuclei far from stability (1982)
    Springer
    The European physical journal 309 (1982), S. 91-92 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Beta decay half lives have been calculated microscopically for ∼6000 nuclei with Z=6–114 between the line of beta stability and the neutron drip line, with an accuracy considerably improved over earlier predictions. The calculated half lives are of particular importance for astrophysical applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420158
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of theβ +-decay of105,106,109In and of100,102Ag (1980)
    Springer
    The European physical journal 298 (1980), S. 21-29 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isomers in the nuclei100Ag (I=5+),102Ag (I=5+),105In (I=9/2+),106In (I=6+),108In (I=6+) were selectively populated by the reactions90Zr(19F,xnγ),92Mo(19F, 2pnγ),92Mo(12C,pxnγ),90Zr(19F,α3nγ) atE lab=72 and 66MeV, and their (β ++EC)-decay was studied with an Anticomptonγ-spectrometer. Spins of the beta-decaying isomers are determined. The results obtained for the beta strength functions are discussed as well as new information on the structure of the neutron-deficient even-even daughter nuclei nearZ=50.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416024
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    Paper (German National Licenses)
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