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  • SPACE RADIATION  (9)
  • 1
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    Composition of interplanetary particles at energies from 0.1 to 150 MeV/nucleon, part B (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: During the Apollo 16 mission, a solar flare produced an enormous amount of low-energy nuclei, many orders of magnitude greater than the level inferred from studies of tracks in the window of the Apollo 12 spacecraft during a time when the sun was quiet. The differential energy spectrum of nuclei with Z less than or equal to 6 falls by seven orders of magnitude over the interval from 0.1 to 20 MeV/nucleon, then remains almost flat up to approximately 100 MeV/nucleon. The two parts correspond to contributions from the sun and from galactic cosmic rays. Any maximum in the spectrum occurs below the lowest energy studied.
    Keywords: SPACE RADIATION
    Type: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 8 p
    Format: text
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  • 2
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    A high-resolution study of ultra-heavy cosmic-ray nuclei (A0178) (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The main objective of the experiment is a detailed study of the charge spectra of ultraheavy cosmic-ray nuclei from zinc (Z = 30) to uranium (Z = 92) and beyond using solid-state track detectors. Special emphasis will be placed on the relative abundances in the region Z or - 65, which is thought to be dominated by r-process nucleosynthesis. Subsidiary objectives include the study of the cosmic-ray transiron spectrum a search for the postulated long-lived superheavy (SH) nuclei (Z or = 110), such as (110) SH294, in the contemporary cosmic radiation. The motivation behind the search for super-heavy nuclei is based on predicted half-lives that are short compared to the age of the Earth but long compared to the age of cosmic rays. The detection of such nuclei would have far-reaching consequences for nuclear structure theory. The sample of ultraheavy nuclei obtained in this experiment will provide unique opportunities for many tests concerning element nucleosynthesis, cosmic-ray acceleration, and cosmic-ray propagation.
    Keywords: SPACE RADIATION
    Type: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 101-104
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  • 3
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    Progress report on the ultra heavy cosmic ray experiment (AO178) (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Ultra Heavy Cosmic Ray Experiment (UHCRE) is based on a modular array of 192 side-viewing solid state nuclear track detector stacks. These stacks were mounted in sets of four in 48 pressure vessels employing sixteen peripheral Long Duration Exposure Facility (LDEF) trays. The extended duration of the LDEF mission has resulted in a greatly enhanced scientific yield from the UHCRE. The geometry factor for high energy cosmic ray nuclei, allowing for Earth shadowing, was 30 sq m-sr, giving a total exposure factor of 170 sq m-sr-y at an orbital inclination of 28.4 degrees. Scanning results indicate that about 3000 cosmic ray nuclei in the charge region with Z greater than 65 were collected. This sample is more than ten times the current world data in the field (taken to be the data set from the HEAO-3 mission plus that from the Ariel-6 mission) and is sufficient to provide the world's first statistically significant sample of actinide (Z greater than 88) cosmic rays. Results to date are presented including details of ultra-heavy cosmic ray nuclei, analysis of pre-flight and post-flight calibration events and details of track response in the context of detector temperature history. The integrated effect of all temperature and age related latent track variations cause a maximum charge shift of +/- 0.8 e for uranium and +/- 0.6 e for the platinum-lead group. The precision of charge assignment as a function of energy is derived and evidence for remarkably good charge resolution achieved in the UHCRE is considered. Astrophysical implications of the UHCRE charge spectrum are discussed.
    Keywords: SPACE RADIATION
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. Part 1: Second Post-Retrieval Symposium; p 261-268
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  • 4
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    Early results from the ultra heavy cosmic ray experiment (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Data extraction and analysis of the LDEF Ultra Heavy Cosmic Ray Experiment is continuing. Almost twice the pre LDEF world sample has been investigated and some details of the charge spectrum in the region from Z approximately 70 up to and including the actinides are presented. The early results indicate r process enhancement over solar system source abundances.
    Keywords: SPACE RADIATION
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. Third Post-Retrieval Symposium, Part 1; p 129-133
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  • 5
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    The LDEF ultra heavy cosmic ray experiment (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The LDEF Ultra Heavy Cosmic Ray Experiment (UHCRE) used 16 side viewing LDEF trays giving a total geometry factor for high energy cosmic rays of 30 sq m sr. The total exposure factor was 170 sq m sr y. The experiment is based on a modular array of 192 solid state nuclear track detector stacks, mounted in sets of four in 48 pressure vessels. The extended duration of the LDEF mission has resulted in a greatly enhanced potential scientific yield from the UHCRE. Initial scanning results indicate that at least 1800 cosmic ray nuclei with Z greater than 65 were collected, including the world's first statistically significant sample of actinides. Post flight work to date and the current status of the experiment are reviewed.
    Keywords: SPACE RADIATION
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 1; p 367-375
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  • 6
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    Particulate impacts on the UHCRE cosmic ray experiment teflon covers: The ESA programme (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The optical scanning equipment at the University of Kent Unit for Space Science consists of a 102.5 by 42.5 cm computer controlled motorized stage which has a reproduction accuracy of 30 microns over the entire area. This is used with an optical microscope connected to two charge coupled device video cameras which can be used to obtain stereo color images of any features found. A coordinate system can be defined on each cover by means of two or more reference marks which allow a feature to be located using different equipment such as a scanning electron microscope, providing two known marks can be found. By using back illumination, penetrating features can be found automatically, and their sizes, circularity, and positions logged for later revisiting either on the optical system or using a scanning electron microscope.
    Keywords: SPACE RADIATION
    Type: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts; p 36
    Format: text
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  • 7
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    The LDEF ultra heavy cosmic ray experiment (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Long Duration Exposure Facility (LDEF) Ultra Heavy Cosmic Ray Experiment (UHCRE) used 16 side viewing LDEF trays giving a total geometry factor for high energy cosmic rays of 30 sq m sr. The total exposure factor was 170 sq m sr y. The experiment is based on a modular array of 192 solid state nuclear track detector stacks, mounted in sets of 4 pressure vessels (3 experiment tray). The extended duration of the LDEF mission has resulted in a greatly enhanced potential scientific yield from the UHCRE. Initial scanning results indicate that at least 2000 cosmic ray nuclei with Z greater than 65 were collected, including the world's first statistically significant sample of actinides. Postflight work to date and the current status of the experiment are reviewed. Provisional results from analysis of preflight and postflight calibrations are presented.
    Keywords: SPACE RADIATION
    Type: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts; p 25
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  • 8
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    Ultra heavy cosmic ray experiment (A0178) (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Ultra Heavy Cosmic Ray Experiment (UHCRE) is based on a modular array of 192 side viewing solid state nuclear track detector stacks. These stacks were mounted in sets of four in 48 pressure vessels using 16 peripheral LDEF trays. The geometry factor for high energy cosmic ray nuclei, allowing for Earth shadowing, was 30 sq m sr, giving a total exposure factor of 170 sq m sr y at an orbital inclination of 28.4 degs. Scanning results indicate that about 3000 cosmic ray nuclei in the charge region with Z greater than 65 were collected. This sample is more than ten times the current world data in the field (taken to be the data set from the HEAO-3 mission plus that from the Ariel-6 mission) and is sufficient to provide the world's first statistically significant sample of actinide cosmic rays. Results are presented including a sample of ultra heavy cosmic ray nuclei, analysis of pre-flight and post-flight calibration events and details of track response in the context of detector temperature history. The integrated effect of all temperature and age related latent track variations cause a maximum charge shift of + or - 0.8e for uranium and + or - 0.6e for the platinum-lead group. Astrophysical implications of the UHCRE charge spectrum are discussed.
    Keywords: SPACE RADIATION
    Type: NASA. Langley Research Center, Second LDEF Post-Retrieval Symposium Abstracts; p 27
    Format: text
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  • 9
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    Galactic heavy cosmic rays with 5 less than E less than 130 MeV/nucleon (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: With stacks of Lexan and cellulose triacetate exposed outside the lunar modules on Apollo 16 and 17, a study was made of the spectra and composition of low-energy particles in interplanetary space. For the period from Apr. 16 to 23, 1972 (Apollo 16), measurements were made of the spectra of the elements 6 less than or equal to Z less than or equal to 28 at energies 40 less than or equal to E less than or equal to 150 MeV/nucleon. For the period from Dec. 11 to 13, 1972 (Apollo 17), a study was made of CNO, NeMgSi, and elements with Z greater than 16 at energies 5 less than or equal to E less than or equal to 40 MeV/nucleon. Using the abundance of charges 17 less than or equal to Z less than or equal to 25 relative to iron as a tracer, it is found that the bulk of the heavy particles in interplanetary space at E greater than 10 MeV/nucleon are of galactic rather than solar origin. The relative abundances of the various charge groups are independent of energy from about 2 GeV/nucleon down to about 30 MeV/nucleon.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
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