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  • LUNAR AND PLANETARY EXPLORATION  (5)
  • 25.70.Np  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Nuclear and electromagnetic fragmentation of 2.25-TeV197Au nuclei (1994)
    Springer
    The European physical journal 348 (1994), S. 105-109 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the first measurement of the total charge-loss cross section σtot=σem+σnuc and partial cross sections (for ΔZ=1, 2, ..., 9) of 11.4 A GeV197Au nuclei in various targets. The large Coulomb barrier for Au reduces the electromagnetic contribution σem in a Pb target to only 18% of σnuc, compared with ∼ 70% for 14.5 A GeV28Si and 120% for 200 A GeV32S. With σem taken to be ∝Z T 1.8 , σnuc can be fitted with σnuc=α(A P 1/3 +A T 1/3 −b)2, with b=0.83 and α=59 mb, essentially the same as found at energies of 1 to 2 A GeV. Electromagnetic partial cross sections for ΔZ=1 exceed ∼ 40 mb in the Pb, Sn, Cu, and Fe targets and are substantial for larger values ofΔZ in the heavier targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289597
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    Paper (German National Licenses)
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  • 2
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    Track studies bearing on solar-system regoliths (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper reports a comparative study of solar-flare tracks and other microscopic features in unmetamorphosed lunar breccias, carbonaceous chondrites, and noncarbonaceous gas-rich meteoritic breccias. The data suggest that these objects originated from material once on and just below the surface of solar-system regoliths. Characteristics of these regoliths are discussed with reference to the track-rich olivines in Orgueil and the impregnated Apollo 16 deep drill core. The use of a variant of the fission-track method to determine the time of compaction of soil grains into a breccia is explained.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Crystal chemistry of Pu and U and concordant fission track ages of lunar zircons and whitlockites (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Improved determination of the long-term average Fe spectrum from approximately 1 to 460 MeV/amu (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is shown that lunar rock 72315, because of its brief surface exposure age and a geometry which minimizes corrosion, makes it possible to obtain a virtually uneroded Fe spectrum, averaged over several hundred thousand years. The absolute exposure age of the rock is determined by taking into account the intensity of solar flares and galactic cosmic rays. The galactic cosmic ray production spectrum reported by Walker and Yuhas (1973) is used in the determination of the exposure age.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 18, 1974 - Mar 22, 1974; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Microstratigraphy of the lunar regolith and compaction ages of lunar breccias (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Fossil track analyses of impregnated core sections from the Apollo 15 and 16 deep drill cores were used to study two types of distinct layers of about 1 mm and about several mm thick in the lunar regolith. The data supports a mixing model hypothesis for the origin of the sampled soil column dominated by large, fresh feldspar fragments. The boundary track method and the track gradient method were used to study the compaction ages of lunar breccias.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Possible detection of energetic Jovian heavy ions at Skylab orbit (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Evidence for the presence of sodium ions at a concentration about 10% that of oxygen among the particles with energies 10 to 20 MeV/nucleon seen with a detector on Skylab suggests that Jupiter is a significant source of energetic heavy particles inside the earth's magnetosphere. A numerical estimate based on the density of energetic sodium ions at 50 Jupiter radii measured on Voyager 1 indicates that the source strength is adequate.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 6; Sept
    Format: text
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    NASA TECHNICAL REPORTS
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