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  • 11
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    Particle track measurements in lunar regolith breccias (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Particle track measurements have been reported for 25 (5 percent) of the regolith breccias in the collection; they have been reported for 16 breccias (30%) in the reference suite. The most frequently reported measurement for these 25 breccias is the maximum surface exposure age of the compacted rock (48% of the published breccia measurements). Information on the nature of the precompaction regolith is given for 9 rocks (36%) and on the nature of the compaction event for 6 rocks (24%). Most of the breccias appear to have simple post compaction surface exposure histories (89%). From the few track density frequency distributions (7) that are available and inferring from the low exposure ages of these rocks (75% were younger than 10 to the 6th years), it appears that most of these breccias are amenable to studies which separate the contemporary surface exposure age from information about the precompaction regolith. If the number of immature submature precompaction soils (6 out of 10 of the breccias for which appropriate data are available) represents many regolith breccias, then it is inferred that regolith breccias may sample the deeper, less reworked materials in the lunar soil and compliment the samples available from the returned cores.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst. Workshop on Past and Present Solar Radiation: The Record in Meteoritic and Lunar Regolith Material; p 14-16
    Format: application/pdf
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  • 12
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    Hydrogen and water desorption on the moon - Approximate, on-line simulations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The basic models that have been used over the last 15 years to describe the accumulation and release of solar wind-related species at lunar conditions at the lunar surface are reviewed. Recent results which show that these models are not totally valid are discussed. It is suggested that mature lunar surface soils may act as efficient converters for transforming the flux of energetic solar wind protons into a flux of low-energy hydrogen and water molecules continuously injected into the lunar atmosphere.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Format: text
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  • 13
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    Cometary interplanetary dust particles? An update on carbon in anhydrous IDPS (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Chondritic anhydrous interplanetary dust particles (IDP's) are widely considered to be the most pristine samples available for the study of the early solar system because of their primitive mineralogy, chemistry, and isotopic characteristics. Previously, anhydrous IDP's were analyzed quantitatively for light elements and found that these particles have significantly higher bulk carbon abundances than known chondritic meteorites. A relationship between carbon abundance and silicate mineralogy was also identified which, in general, shows that particles dominated by pyroxenes have a higher carbon abundance than those dominated by olivines. Particles containing equal amounts of olivine and pyroxene show a range of carbon contents and can be grouped with either the pyroxene- or olivine-dominated particles based on their carbon abundance. It was suggested that high carbon pyroxene-rich IDP's are derived from cometary sources. Bulk compositions and mineralogy of our additional IDP's were determined; one particle has the highest carbon abundance reported in IDP's or any other chondritic material, with the possible exception of the carbon-rich Halley particles.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1425-1426
    Format: text
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  • 14
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    Particle track measurements in lunar regolith breccias (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Particle track measurements have been reported for 25 (5 percent) of the regolith breccias in the collection; they have been reported for 16 breccias (30 percent) in the reference suite. The most frequently reported measurement for these 25 breccias is the maximum surface exposure age of the compacted rock (48 percent of the published breccia measurements). Information on the nature of the precompaction regolith is given for 9 rocks (36 percent) and on the nature of the compaction event for 6 rocks (24 percent). Most of the breccias appear to have simple post-compaction surface exposure histories (89 percent). From the few track density frequency distributions (7) that are available and inferring from the low exposure ages of these rocks (75 percent were younger than 10 to the 6th years), it appears that most of these breccias are amenable to studies which separate the contemporary surface exposure age from information about the precompaction regolith. If the number of immature-submature precompaction soils (6 out of 10 of the breccias for which appropriate data are available) represents many regolith breccias, then we can infer that regolith breccias may sample the deeper, less reworked materials in the lunar soil and compliment the samples available from the returned cores.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth, Moon, and Planets (ISSN 0167-9295); 31; 221-227
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  • 15
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    The origin and propagation of VVH primary cosmic ray particles (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Several source spectra were constructed from combinations of 4- and s-process nuclei to match the observed charge spectrum of VVH particles. Their propagation was then followed, allowing for interactions and decay, and comparisons were made between the calculated near-earth spectra and those observed during high altitude balloon flights. None of the models gave good agreement with observations.
    Keywords: SPACE RADIATION
    Type: NASA-CR-136366
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  • 16
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    Observation of cosmic-ray particles with Z of 50 or greater and interpretation of the charge spectrum. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Large areas of plastic detectors and nuclear emulsions were exposed to the primary cosmic radiation on two high-altitude balloon flights in May 1968 and September 1969. From measurements on the tracks found in the scanning of the plastic detectors, events with charges Z greater than 50 were selected, and these data were consolidated with those from our earlier flights. Several conclusions can be drawn from the observed charge spectrum. The detection of trans-bismuth nuclei confirms earlier observations of these particles in the cosmic rays. However, no trans-uranium particles were observed. Detailed features of the charge spectrum cannot be explained by nuclei from r-process nucleosynthesis alone. Although the addition of particles following s-process abundances yields improved agreement, the spectrum appears more complicated than would result from a simple combination of r- and s-process abundances with identical propagation histories.
    Keywords: SPACE RADIATION
    Type: Physical Review D - Particles and Fields; vol. 8
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  • 17
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    Observation of cosmic-ray particles with Z greater than 35. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The results of two flights conducted in Texas in September 1968 are reported, giving attention to experimental details, the charge spectrum, and the primary flux of very very heavy cosmic rays. Considerable interest is attached to the observation of uranium, thorium, and transuranic nuclei in the cosmic radiation. It is found that the relative abundances of the charge groups in the ranges from 35 to 40 and from 41 to 50 deviate significantly from solar system abundances.
    Keywords: SPACE RADIATION
    Type: Physical Review D - Particles and Fields; vol. 8
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  • 18
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    Primary cosmic ray particles with Z greater than 40 (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Primary cosmic ray particles with Z greater than 40 identified by tracks in balloon-borne nuclear emulsions and plastic detectors
    Keywords: SPACE RADIATION
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  • 19
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    Cosmic ray production curves below reworking zones (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method is presented for calculating cosmic ray production profiles below reworking zones. The method uses an input reworking depth determined from data such as signatures in the depth profile of ferromagnetic resonance intensity and input cosmic ray production profiles for an undisturbed surface. Reworking histories are simulated using Monte Carlo techniques, and depth profiles are used to determine cosmic ray exposure age limits with a specified probability. It is shown that the track density profiles predict cosmic ray exposure ages in lunar cores that are consistent with values determined by other methods. Results applied to neutron fluence and spallation rare gases eliminate the use of reworking depth as an adjustable parameter and give cosmic ray exposure ages that are compatible with each other.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
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  • 20
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    Irradiation stratigraphy and depositional history of the Apollo 16 double drive tube 60009/10 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We report track density frequency distributions, the fraction of high density grains and minimum track densities for 63, 1 mm wide locations in the Apollo 16 double drive tube 60009/10. From these data we conclude that there are seven irradiation strata in the core. Only one buried reworking zone extending from 50-52 cm was found and it was exposed near the surface from 4.5-9 times 10 to the 6th y with a most probable exposure period of 6 times 10 to the 6th y. There is lack of conclusive data that this zone represents a reworking zone in which case the material below 52 cm most probably was exposed in situ for 4.5 times 10 to the 6th y and developed a reworking zone approximately less than 0.5 cm. The present surface of the core has a reworking zone of 12-13 cm which was exposed from 1.3 times 10 to the 7th to 2.5 times 10 to the 8th y. The best estimate for this exposure period remains the value of approximately less than 1.25 times 10 to the 8th y determined by Bogard and Hirsch (1976). The other strata in the core appear to contain mixtures of various soil types and are not related to in situ depositional events.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 19, 1979 - Mar 23, 1979; Houston, TX
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