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  • SPACE RADIATION  (12)
  • 1
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    Capabilities of the LDEF-2 heavy nuclei collection (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: To take the next big step beyond High Energy Astronomy Observatory (HEAO-3) the Heavy Nuclei Collector (HNC), to be carried on an LDEF reflight, has the goals of greatly increased collecting power ( 30 actinides) and charge resolution sigma sub Z or = 0.25 E for Z up to approximately 100, which will provide abundances of all the charges 40 or Z or = 96 and permit sensitive searches for hypothetical particles such as monopoles, superheavy elements, and quark nuggets.
    Keywords: SPACE RADIATION
    Type: OG-4.4-8 , 19th Intern. Cosmic Ray Conf - Vol. 2; p 131-134; NASA-CP-2376-VOL-2
    Format: application/pdf
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  • 2
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    A measurement of the cosmic-ray source abundance of Ca-40 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The measured charge composition of the galactic cosmic rays from Ar to Ni and the isotopic composition of the elements Ca and Sc are presented. It is found that the ratio Ca-40/Fe at the cosmic-ray source is (5.9 plus or minus 1.9)%. This result is in good agreement with the meteoritic value (6.8 plus or minus 1.0)%.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 232
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  • 3
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    An experiment to measure the energy spectrum of cosmic ray antiprotons from 100 to 1000 MeV (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Production models were developed and the confirmation of each one had significant astrophysical impact. These include radical modifications of propagation models, cosmic ray antiprotons injection from neighboring domains of antimatter, p production by evaporating primordial black holes, and cosmic ray p's as annihilation products of supersymmetry particles that might make up the dark dynamical mass of the Galaxy. It is that p's originating from supersymmetric parents might have distinct spectral features that would survive solar modulation; in one model, higgsino annihilation proceeds through the bb quark-antiquark channel, producing a spectral bump at approx. 0.3 GeV in the p spectrum.
    Keywords: SPACE RADIATION
    Type: OG-9.1-3 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 258-261; NASA-CP-2376-VOL-3
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  • 4
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    Cosmic ray isotope abundances from chromium to nickel (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: IRIS, a telescope consisting of a large-area precision Cerenkov detector, scintillators, spark chambers, and a passive stack of Lexan polycarbonate track detectors, was exposed to the primary cosmic radiation for 6.6 sq m sr hr in a balloon flight in 1976. This measurement has yielded the isotopic composition of the iron-group elements Cr, Mn, Fe, and Ni with an average mass resolution of 0.65 amu for the energies 320-500 MeV per amu at the detector. This experiment places the most severe constraints to date on deviation from solar-system composition of the source of the cosmic radiation. Upper limits of 10 percent are placed on the ratios Fe-54/Fe-56 and Fe-58/Fe-56, which are inconsistent with large departures from solar system source composition reported by other workers. The isotopic measurements of Fe and Ni preclude the possibility that these cosmic rays were produced in a single e-process zone. The mean mass of Mn is less than 55, indicating the presence of electron-capture species produced by spallation.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 230
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  • 5
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    Monopole track characteristics in plastic detectors (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Total and restricted energy loss rates were calculated for magnetic monopoles of charge g = 137 e in Lexan polycarbonate. Range-energy curves are also presented. The restricted energy loss model is used to estimate the appearance of a monopole track in plastic detectors. These results should be useful for the design and analysis of monopole experiments.
    Keywords: SPACE RADIATION
    Type: NASA-CR-146806
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  • 6
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    High resolution Cerenkov and range detectors for balloon-borne cosmic-ray experiment (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A combination of an active Cerenkov detector and passive range detectors is proposed for the high resolution measurement of isotopic composition in the neighborhood of iron in the galactic cosmic rays. A large area (4,300 sq cm) Cerenkov counter and passive range detectors were tested. Tests with heavy ions (2.1 GeV/amu C-12, 289 MeV/amu Ar-40, and 594 MeV/amu Ne-20) revealed the spatial uniformity of response of the Cerenkov counter to be better than 1% peak-to-peak. Light collection efficiency is independent of projectile energy and incidence angle to within at least 0.5%. Passive Lexan track recorders to measure range in the presence of the nuclear interaction background which results from stopping particles through 0.9 interaction lengths of matter were also tested. It was found that nuclear interactions produce an effective range straggling distribution only approximately 75% wider than that expected from range straggling alone. The combination of these tested techniques makes possible high mass resolution in the neighborhood of iron.
    Keywords: SPACE RADIATION
    Type: NASA-CR-146796
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  • 7
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    Can we detect antimatter from other galaxies (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A novel particle detection technique employing well established principles of high order quantum electrodynamics for searching for antimatter in cosmic rays is described, and shown to have both collecting power and resolution superior to conventional alternatives. By taking into account various estimates of the metagalactic cosmic-ray energy density, and the possible modulation of metagalactic cosmic rays by a galactic wind within the framework of the dynamical halo model, it is shown that the experiment proposed would be the first to be sensitive to the presence of extragalactic antimatter.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 260
    Format: text
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  • 8
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    The University of California Iron Isotope Experiment (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We suggest a novel technique for resolving neighboring isotopes of iron-group nuclei with abundance ratios as great as 20:1 over the energy range from about 360 to about 550 MeV/nucleon. The determination of mass is based on the proportionality between mass and range and the negligible magnitude of range straggling. A balloon-borne experiment based on this technique is described which uses active electronic counters to measure particle speed, trajectory, and charge, and a passive polycarbonate plastic stack to measure range.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 9
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    Measurement of the isotopic composition of the iron-group elements in the galactic cosmic radiation (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: With an average mass resolution of approximately 0.65 amu the isotopic composition of Cr, Mn, Fe, and Ni in the galactic cosmic radiation has been measured for energies of about 300 to 600 MeV/amu at the detector. Large deviations from solar-system source composition reported by other workers are not observed.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters; 41; Sept. 11
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  • 10
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    New limit on the low-energy antiproton/proton ratio in the Galactic cosmic radiation (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are presented from a balloon-borne apparatus searching for low-energy antiprotons in the Galactic cosmic rays. For energies less than 640 MeV at the top of the atmosphere, no cosmic-ray antiprotons were observed. This yields an upper limit to the antiproton/proton ratio of 0.000046 at the 85-percent confidence level.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters (ISSN 0031-9007); 61; 145-148
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