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  • 1
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    The global atmospheric research program (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The survey paper deals with the major activities, during the past four years, within the Global Atmospheric Research Program (GARP), written for the Atlantic Tropical Experiment (GATE). Emphasis is on the participation of the United States, but in the context of the international effort as a whole. The activities are outlined according to the subprograms recognized by the international Joint Organization Committee for GARP.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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  • 2
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    Measured performance of the new University of California gamma ray telescope (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design of the new medium energy balloon-borne gamma ray telescope is discussed. This telescope is sensitive to 1-30 MeV gamma rays. The results of the initial calibration are described. The position and energy resolutions of 32 plastic and NaI(Tl) scintillator bars, each 100 cm long are discussed. The telescope's measured angular and energy resolutions as a function of incident angle are compared with detailed Monte Carlo calculations at 1.37, 2.75 and 6.13 MeV. The expected resolutions are 5 deg FHWM and 8% at 2.75 MeV. The expected area-efficiency is 250 cm.
    Keywords: SPACE RADIATION
    Type: OG-9.2-13 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 342; NASA-CP-2376-VOL-3
    Format: application/pdf
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  • 3
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    Monte Carlo simulation of a new gamma ray telescope (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A new Monte Carlo code has been written to simulate the response of the new University of California double scatter gamma ray telescope. This package of modular software routines, written in VAX FORTRAN 77 simulates the detection of 0.1 to 35 MeV gamma rays. The new telescope is flown from high altitude balloons to measure medium energy gamma radiation from astronomical sources. This paper presents (1) the basic physics methods in the code, and (2) the predicted response functions of the telescope. Gamma ray processes include Compton scattering, pair production and photoelectric absorption in plastic scintillator, NaI(Tl) and aluminum. Electron transport processes include ionization energy loss, multiple scattering, production of bremsstrahlung photons and positron annihilation.
    Keywords: ASTRONOMY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-32; 124-128
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  • 4
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    Gamma rays of 0.3-30 MeV from PSR0833 - 45 (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Pulsed gamma rays from the Vela pulsar PSR0833 - 45 are reported for the first time over the medium energy range 0.3-30 MeV. They were observed with a double scatter gamma-ray telescope flown on a balloon over Australia on Nov. 10, 1981, 31 days after a large glitch in the pulsar period. The first and second pulses were detected from single scatters in the top scintillators at energies over 0.3 MeV with statistical significances of 1.6 sigma each, and by double scatters from all detector cell pairs at energies of 1-30 MeV with significance of 4.8 sigma and 3.8 sigma. The phase separation of the two pulses is 0.43 + or - 0.02 at the same absolute phases previously found by SAS2 and COS B for energies over 35 MeV.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 310; 214-216
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  • 5
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    Few arc-minute and keV resolutions with the TIGRE Compton telescope (1997)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: The tracking and imaging gamma ray experiment (TIGRE) Compton telescope concept can provide an angular resolution of a few arcmin, an energy resolution of a few keV and high sensitivity, while providing the wide field of view necessary for surveying and monitoring observations. Silicon and CdZnTe strip detectors are used to detect Compton pair events and determine their incident directions and energies. Above 400 keV, Compton recoil electrons are tracked through successive layers of thin silicon strip detectors. Compton scattered photons are detected with CdZnTe strip detectors. Pair electrons and positrons are tracked to provide high sensitivity observations in the 10 to 100 MeV range. Polarization studies are performed with large angle Compton scatter events. The TIGRE concept and development status are described.
    Keywords: Astronomy
    Type: ; 367-370
    Format: text
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  • 6
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    Gamma rays of 1-30 MeV from the Galactic Center Region (1983)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Preliminary results are reported for gamma rays from the Galactic Center Region at 1-30 MeV made with a balloon-borne double Compton scatter gamma ray telescope. The Compton scatter angle, energy, and arrival time of the incident gamma ray and direction of the Compton scattered secondary for downward-moving gamma rays were measured. The handling of the data is described, and the results of Monte Carlo simulation angular resolutions and absolute efficiencies for different zenith angles of incident gamma rays are given. A contour sky map of the weighted fluxes for a southern sky region is shown whose primary feature is a significant enhancement in the Galactic Center Region. It is concluded that several discrete sources contribute to broaden the maximum in the horizontal or RA direction. Less broadening is indicated along the galactic plane.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 22, 1983 - Sep 03, 1983; Bangalore; India
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  • 7
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    Gamma rays of 1-30 MeV from the Vela Pulsar PSR 0833-45 (1983)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Results are reported for observations of gamma rays of 1-30 MeV from the Vela Pulsar PSR 0833 - 45 carried out with the UCR double scatter gamma ray telescope on a balloon launched from Alice Springs, Australia on November 10, 1981. An integrated flux of (5.3 + or - 1.3) x 10 to the -4th photons/sq cm/s is found for the Vela region above 2 MeV. This value, together with those for the energy intervals of 2-4, 4-7, and 7-15 MeV are in reasonable agreement with the power law found by COS-B at energies above 50 MeV. A sky contour map of the fluxes is shown.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 22, 1983 - Sep 03, 1983; Bangalore; India
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