Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Radioactive Dating of the Elements (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 29 (1991), S. 447-497 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.29.090191.002311
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Nucleosynthesis (1984)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 34 (1984), S. 53-97 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.34.120184.000413
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Helium Deficiency in Old Halo B Stars (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 871-873 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Calculations show that in old halo B stars most helium will have diffused below the photosphere and therefore will not be detected spectroscopically. This may account for the low abundances of helium observed in these ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213871a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The Galactic Halo (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 710-711 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We reconsidered this problem in connexion with our preparations for the symposium on the chemical evolution of the galaxy recently held at the California Institute of Technology in honour of the sixtieth birthday of J. L. Greenstein. This exercise was a new version of a study carried out a few ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/225710a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Explosion of a blue supergiant: a model for supernova SN1987A (1987)
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 597-600 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A particularly important early clue to the nature of this supernova event was provided by the probable identification of the progenitor of SN1987A with the B3 I supergiant star Sk-69 202. Such behaviour was not anticipated by supernova theorists, because standard models for the expected massive ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/327597a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Possible transfer of lunar matter to Earth due to a nearby supernova (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 328-329 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SNE models often involve a configuration in which the dense exploding stellar core is surrounded by a rather minimal atmosphere3,5. Under such circumstances, the outgoing supernova shock wave propagating through a very steep density gradient will become extremely relativistic. The hot ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284328a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The anthropic significance of the existence of an excited state of 12 C (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 281-284 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Were it not for the presence of an excited state of 12C at 7.6 MeV, at the endpoint of the triple-alpha reaction, it would be difficult for stars to manufacture carbon and heavier elements. Calculations using modified triple-alpha rates test the sensitivity of stellar nucleosynthesis ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340281a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    On possible short-lived progenitors of fission xenon in carbonaceous chondrites (1975)
    Springer
    Astrophysics and space science 36 (1975), S. L1 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We suggest that the unidentified fission xenon component in carbonaceous chondrites may be attributable to the decay of the extinct radioactivities250Cm and, to a lesser extent,258Cm. Two assumptions are fundamental to this picture: (1) these relatively short-lived actinides (1.13×104 and 3.7×105 yr, respectively) were incorporated into grains in the vicinity of their supernova birthplace (prior to decay); and (2) such grains and their trapped anomalous xenon component were incorporated intact into the meteorites. Recognizing the many substantial uncertainties associated with our suggested model, we emphasize the importance of precise experimental determinations of the mass spectra of fission xenon resulting from250Cm and248Cm decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681956
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The waiting point approximation inr-process calculations (1983)
    Springer
    Astrophysics and space science 91 (1983), S. 235-243 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The steady flow approximation to ther-process has been used to evaluate the validity of the waiting point assumption (that, for a given charge numberZ, neutron captures become balanced by neutron photodisintegrations) under a variety of conditions. The criterion for the accuracy of the approximation for any set of nuclei with the same value ofZ is that the ratio of the total rate of neutron photodisintegration in those nuclei to the total rate of neutron captures should be close to unity. We have failed to find any set of conditions involving neutron production by helium thermonuclear reactions (at temperatures up to 109 K) for which the waiting point approximation is useful for all values ofZ, and we recommend that all suchr-process calculations not use this approximation. At higher temperatures, such as those characteristic of explosive carbon burning (2×109 K), the waiting point approximation is much better.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...