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  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • ASTROPHYSICS  (3)
  • 1
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    Electron microscopy of irradiation effects in space (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The paper discusses several discoveries made in the study of lunar material. In the examination of the effects of solar wind implantations the topics covered include (1) solar wind radiation damage parameters and their aging characteristics, (2) the theory of the ancient solar wind, (3) the solar wind sputtering erosion rate, (4) the physicochemical properties of amorphous coatings, (5) maturity indexes and the macroscopic properties of the lunar regolith, (6) solar wind gas bubbles, (7) the composition of very heavy nuclei in the contemporary solar wind, and (8) track aging processes. Conclusions are drawn from the results about other extraterrestrial features such as the parent bodies of the meteorites, early solar nebulas, and interstellar clouds.
    Keywords: ASTROPHYSICS
    Type: Science; 187; Jan. 17
    Format: text
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  • 2
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    Energy straggling eliminated as a limitation to charge resolution of transmission detectors (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is pointed out that detectors of the energy loss of penetrating charged particles are widely used for particle identification. These measurements are hampered, however, by fluctuations in the amount of energy deposited within the detector. It is shown that this limitation can be overcome with a new nuclear track detector, CR-39(DOP), and that the charge resolution of this detector exceeds that of any other, including semiconductor diodes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nature; 293; Oct. 15
    Format: text
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  • 3
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    Sonic spark chambers for cosmic-ray experiments (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The sonic spark chamber provides an attractive high resolution hodoscope for low flux cosmic ray experiments. Spark position is determined by measurement of the time of flight of the sonic shock front from the spark position to a number of piezoelectric transducers placed at the periphery of the chamber. For each spark, four quantities must be determined: the spark coordinates, the sound velocity, and the spark 'size'. By over-determining the four parameters, high accuracy is possible. With eight sonic transducers, air-gap spark positions were measured with an error of less than 100 microns everywhere over a 1 sq m region.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 4
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    A search for charged massive particles in IMP 8 data (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Data from the IMP 8 satellite are used here to rule out charged massive particles (CHAMPs) with masses between 2.4 and 56,000 TeV as the source of the dark matter in the Galactic halo. This limit is achieved under the assumption that CHAMPs are virialized.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 364; L25-L27
    Format: text
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  • 5
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    High resolution image measurements of nuclear tracks (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The striking clarity and high contrast of the mouths of tracks etched in CR-39 plastic detectors allow automatic measurement of track parameters to be made with simple image-recognition equipment. Using a commercially available Vidicon camera system with a microprocessor-controlled digitizer, resolution for normally incident C-12 and N-14 ions at 32 MeV/amu equivalent to a 14sigma separation of adjacent charges was demonstrated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
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  • 6
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    Research on CR-39 plastic detectors for cosmic ray astrophysics (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The sensitivity of CR-39 is a strong function of catalyst concentration during its polymerization. Normal CR-39 will detect vertically incident particles with Z/beta as low as 10. An extrapolation suggests that CR-39 with a high catalyst concentration and sensitivity to within approximate 5% can be made by a suitable choice of cure cycle and mold material. CR-39 is less sensitive than Lexan to thermal annealing of tracks but cannot tolerate background radiation levels greater than a few Mrad.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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  • 7
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    Relativistic astrophysics (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The design, experimental testing, and calibration (error analysis) of a high resolution Cerenkov-scintillation detector is presented. The detector is capable of detecting iron isotopes and heavy ions of cosmic rays, and of performing direct measurements of individual neighboring isotopes at charge resolution 26. It utilizes Lexan (trademark) sheets, and has been used in flight packages of balloons and on the Skylab. The detector will be able to provide more information on violet astrophysical processes, such as thermonuclear reactions on neutron stars. Ground support and display equipment which are to be used in conjunction with the detector are also discussed.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-146160 , SSL-SER-17-ISSUE-7
    Format: application/pdf
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