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  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • NUCLEAR AND HIGH-ENERGY PHYSICS  (3)
  • 1
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    Science requirements for Heavy Nuclei Collection (HNC) experiment on NASA Long Duration Exposure Facility (LDEF) Mission 2 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Heavy Nuclei Collection (HNC) is a passive array of stacks of a special glass, 14 sheets thick, that record tracks of ultraheavy cosmic rays for later readout by automated systems on Earth. The primary goal is to determine the relative abundances of both the odd- and even-Z cosmic rays with Z equal to or greater than 50 with statistics a factor at least 60 greater than obtained in HEAO-3 and to obtain charge resolution at least as good as 0.25 charge unit. The secondary goal is to search for hypothetical particles such as superheavy elements. The HNC detector array will have a cumulative collection power equivalent to flying 32 sq m of detectors in space for 4 years. The array will be flown as a free-flight spacecraft and/or attached to Space Station Freedom.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: NASA-CR-187527 , NAS 1.26:187527
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 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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    NASA TECHNICAL REPORTS
  • 3
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    Evidence for detection of a moving magnetic monopole (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A very heavy particle passed through a balloon-borne stack of Cherenkov film, emulsion, and Lexan sheets. In 33 Lexan sheets it produced tracks expected of either a nucleus with Z ranging between 125 and 137 and with beta less than about 0.92 or a magnetic monopole with g = 137e. Its track structure in emulsion indicated it was moving downward with beta equal to 0.5 (plus 0.1 or minus 0.05) and was either a nucleus with Z equal to 80 or a monopole with g = 137e. These facts strongly favor identification of the particle as a magnetic monopole of strength g = 137e and mass greater than 200 times proton mass.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review Letters; 35; Aug. 25
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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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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  • 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
    Format: text
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    NASA TECHNICAL REPORTS
  • 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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    Mesoscale acid deposition modeling studies (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The work performed in support of the EPA/DOE MADS (Mesoscale Acid Deposition) Project included the development of meteorological data bases for the initialization of chemistry models, the testing and implementation of new planetary boundary layer parameterization schemes in the MASS model, the simulation of transport and precipitation for MADS case studies employing the MASS model, and the use of the TASS model in the simulation of cloud statistics and the complex transport of conservative tracers within simulated cumuloform clouds. The work performed in support of the NASA/FAA Wind Shear Program included the use of the TASS model in the simulation of the dynamical processes within convective cloud systems, the analyses of the sensitivity of microburst intensity and general characteristics as a function of the atmospheric environment within which they are formed, comparisons of TASS model microburst simulation results to observed data sets, and the generation of simulated wind shear data bases for use by the aviation meteorological community in the evaluation of flight hazards caused by microbursts.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: NASA-CR-4262 , NAS 1.26:4262
    Format: application/pdf
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