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  • 1980-1984  (3)
  • 1970-1974  (5)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Cosmic-Ray Record in Solar System Matter (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 33 (1983), S. 505-538 
    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.33.120183.002445
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic applications of electron paramagnetic resonance spectroscopy. XVI. Cyclization of the 5-hexenyl radical (1974)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 6355-6357 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00827a018
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Atmospheric P CO 2 changes recorded in lake sediments (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 344-346 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Using a four-box model for the global carbon cycle, including the southern ocean reservoir, Lal and Venkatavaradan5 showed that changes in the atmospheric PCo2 or in the large-scale ocean circulation can produce appreciable changes in the atmospheric d14C, of the order observed in the tree-ring ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308344a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Super-heavy Elements in Extraterrestrial Samples (1971)
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 219-224 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fossil track studies in several meteorites and in lunar dust show that super-heavy (Z 〉 110) transuranic elements were indeed present when these objects ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/230219a0
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  • 5
    Electronic Resource
    Electronic Resource
    Fossil Tracks in the Meteorite Angra dos Reis: a Predominantly Fission Origin (1971)
    [s.l.] : Nature Publishing Group
    Nature 234 (1971), S. 540-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The normal etching time for revealing well formed tracks was 40-45 min in a solution of 60% sodium hydroxide by weight at its boiling point2. For revealing TINT (track-in-track) and TINGLE (track-in-cleavage) types of confined tracks, having both their tips within the crystal2,6, the etching times ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/234540a0
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  • 6
    Electronic Resource
    Electronic Resource
    Hard rock cosmic ray archaeology (1972)
    Springer
    Space science reviews 14 (1972), S. 3-102 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent examinations of extraterrestrial materials exposed to cosmic rays for different intervals of time during the geological history of the solar system have generated a wealth of new information on the history of cosmic radiation. This information relates to the temporal variations in (i) the flux and energy spectrum of low energy (solar) protons of ⩾ 10 MeV kinetic energy; (ii) the flux and energy spectrum of (solar) heavy nuclei of Z 〉 20 of kinetic energy, 0.5–10 MeV/n; (iii) the integrated flux of protons and heavier nuclei of ⩾ 0.5 GeV kinetic energy, and (iv) the flux and energy spectrum of nuclei of Z 〉 20 of medium energy — 100–2000 MeV/n kinetic energy. The above studies are entirely based on the natural detector method which utilises two principal cosmogenic effects observed in rocks, (i) isotopic changes and (ii) changes in the crystalline structure of rock constituents, due to cosmogenic interactions. The information available to date in the field of hard rock cosmic ray archaeology refers to meteorites and lunar rocks/soil. Additional information based on study of cosmogenic effects in man-made materials exposed to cosmic radiation in space is also discussed. It is shown that the natural detectors inspite of their extreme simplicity have begun to provide cosmic ray information in a very quantitative and precise manner comparable to the most sophisticated electronic particle detectors. The single handicap in using the hard rock detectors is however the uncertainty regarding their manner of exposure, geometry etc. At present, a variety of techniques are being used to study the evolutionary history of extraterrestrial materials and as this field grows, uncertainties in cosmic ray archaeology will correspondingly decrease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227810
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  • 7
    Electronic Resource
    Electronic Resource
    Cosmic ray effects induced in a rock exposed on the moon or in free space: contrast in patterns for ‘tracks’ and ‘isotopes’ (1973)
    Springer
    Earth, moon and planets 8 (1973), S. 253-286 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Analytical studies are reported here for two cosmogenic effects due to low energy particles in extraterrestrial samples: (i) Formation of latent chemically etchable tracks in crystalline materials due to solid state damage as a result of ionisation losses suffered by multicharged cosmic ray nuclei, and (ii) Production of low threshold isotopes due to nuclear interactions of solar cosmic ray particles. The present analytical treatment is different from those previously reported and is more directly applicable to recent studies of low energy cosmogenic effects in meteorites and in lunar samples. We consider irradiation of ellipsoidal rocks in space and on the Moon. In the latter case, different irradiation geometries corresponding to different burials in the regolith are also considered. It is shown that results of irradiation of an object on the surface of a parent body differ from that of an object in free space in more complex manner than a uniform reduction by a factor of two due to the change over from 2π to 4π irradiation. Isocontours for ‘tracks’ or ‘isotopes’ are found to be markedly different in the two cases. Thus, the irradiation geometry must be explicitly taken into account in interpreting low-energy cosmogenic effects in lunar rocks. Simultaneous analyses of tracks and radioisotopes of different half-lives should allow one to establish principal irradiation geometries both for meteorites and lunar samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581724
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  • 8
    Electronic Resource
    Electronic Resource
    Gas-rich meteorites: Probes for particle environment and dynamical processes in the inner solar system (1984)
    Springer
    Space science reviews 37 (1984), S. 111-159 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The discovery in the early sixties of precompaction solar wind irradiation records in the gas-rich meteorites opened up the possibility of studying the solar activity at different epochs in the distant past. Subsequent studies in several meteorites have led to the discovery of the precompaction records of irradiation of constituent grains by solar wind, solar flare and galactic cosmic ray particles. There are also microcraters resulting from their collisions with interplanetary dust grains. Analyses of these records and their observed similarity with those found in the lunar samples led to the hypothesis that the precompaction records in individual components of these meteorites were imprinted while they were residing in the near surface region of their parent bodies, most probably the asteroids. Although the asteroids are the most plausible candidates for the parent bodies of gas-rich meteorites, there exist certain dynamical arguments which tend to favor a cometary origin in certain cases. Also, recent studies indicate that in the case of gas-rich carbonaceous chondrites solar flare irradiation of grains may have occurred prior to formation of the parent bodies. In this review we summarize the significant advances that have taken place in the multi-disciplinary studies (petrography, chemistry, and radiation effects) of the gas-rich meteorites and critically evaluate the present state of our knowledge regarding the origin and evolution of the gas-rich meteorites. The information on the spatial and temporal variations in the interplanetary radiation and particle fluxes, obtained from the analysis of precompaction irradiation records in these meteorites is presented and further studies in certain specific topics are suggested for resolving some of the unsolved problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213959
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