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  • Other Sources  (5)
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  • 1
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    Remarks concerning the s-process (1973)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The abundances of Fe-58 and Co-59 are far too large to be compatible with an s-process acting on Fe-56 as the only essential seed material unless a sharp lower cut-off is introduced ad hoc into the flux distribution. This cut-off leads to a maximum in the abundance times cross-section curve around A = 60 for which there is evidence but which can naturally be explained as an image of the iron peak shifted by an almost uniform neutron flux. Further evidence supports the conclusion of Peters et al. that the iron peak must have been considerably smaller for the seed of the s-process than for the solar system matter.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astronomy and Astrophysics; 28; 3; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    History and current understanding of the Suess abundance curve (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: By means of a gamma ray sum spectrometer currently under development, many neutron capture cross sections will be determined with high accuracy, thereby facilitating the inferrence of the abundance ratios of neighboring elements with the same accuracy. Attention is presently given to this and other prospects emerging in the study of nuclide abundances and the data base for theories of element synthesis. Poorly understood structures in the abundance curve are discussed in view of recent models on nuclear structure and stability.
    Keywords: ASTROPHYSICS
    Type: Meteoritics (ISSN 0026-1114); 20; 311-320
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    NASA TECHNICAL REPORTS
  • 3
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    On the origin of the heavy nuclei. (1968)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Heavy nuclei origin based on empirical abundance distribution, discussing stellar, galactic and cosmic events for nuclear genesis
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; YAL SOCIETY (
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    NASA TECHNICAL REPORTS
  • 4
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    The disintegration of heavy nuclei at elevated temperatures (1967)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Proton, neutron and alpha particle emission rates for heavy nuclei in elevated temperatures calculated and tabulated
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: HEIDELBERGER AKADEMIE DER WISSENSCHAFTEN
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The abundances of the heavy elements. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Abundance regularities for heavy nuclei (A greater than 58) are investigated and formulated as abundance rules. Abundance values of carbonaceous chondrites of type 1 and 2 as well as most probable values for primordial abundances are listed. The abundance rules definitely require minor correctons of the empirical values. A measurement of the (u, gamma) cross-section of Pd-104 would make possible to decide whether type-1 or type-2 carbonaceous chondrites have a more primitive elemental composition.
    Keywords: CHEMISTRY
    Type: Astrophysics and Space Science; 23; July 197
    Format: text
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    NASA TECHNICAL REPORTS
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