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  • ASTROPHYSICS  (3)
  • 1985-1989  (3)
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    Short-lived nuclei in the early solar system (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: An overview is given of the existence and abundance of short-lived nuclei that were present in the early solar system. It is shown that there are excesses of certain isotopes that may be assigned to the decay of short-lived radioactive nuclei corresponding to an abundance of about 0.0001 relative to a neighboring stable isotope. This abundance is roughly similar to the level of general nonlinear isotopic anomalies present in meteoritic material (excluding oxygen) which are not attributable to short-lived nuclei. If these results are representative of the bulk solar system, they indicate that about 0.0001 solar mass of freshly synthesized material of peculiar composition was added to the protosolar nebula as it was formed from the interstellar medium. This material must have been synthesized about three million yr before the formation of the solar system.
    Schlagwort(e): ASTROPHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 2
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    Extinct nuclides - Much ado about nothing (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Attention is given to the status of research on short lived nuclei, whose importance is considerable despite their essential absence (outside cosmic ray products) in virtue of their place in the theoretical understanding of broader cosmological problems. It is presently suggested that they are a key to the earliest processes in solar system formation, and may furnish a link with presolar processes in the interstellar medium or in the intense activity of the early sun.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Meteoritics (ISSN 0026-1114); 20; 295-310
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 3
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    The presence of Sm-146 in the early solar system and implications for its nucleosynthesis (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A correlation of Nd-142/Nd-144 with Sm-144/Nd-144 in two meteorites which have a large range in Sm-144/Nd-144 in their constituent mineral phases is presented as evidence for the presence of the p-process nucleus Sm-146 in the early solar system and its alpha-decay into Nd-142. The ratio Sm-146/Sm-144 is estimated to be about 0.015 at the time of solar system formation, 4.56 AE ago. It is suggested that the abundance of Sm-146 is compatible with p-proc ess production rate estimates, but not with the production rate for Sm-146 based on a photodisintegration model for the production of p-process nuclides.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 344; L81-L84
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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