Physics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aujph..32..375y&link_type=abstract
Australian Journal of Physics, vol. 32, Sept. 1979, p. 375-382.
Physics
9
Balloon-Borne Instruments, Energy Spectra, Galactic Radiation, Gamma Rays, Spectrometers, Emission Spectra, Spectrum Analysis
Scientific paper
An experimental search for diffuse galactic gamma-ray lines using a balloon-borne Ge(Li) detector is reported. The high-resolution Ge(Li) detector surrounded by a plastic scintillator shield was used to search for 0.2- to 6-MeV gamma ray lines during a 26-hour scan of the galactic plane between longitudes of 40 to 210 deg. Upper limits to the intensity of galactic plane emission from positron annihilation and excited Ne-20, Mg-24, Si-28 and Fe-56 nuclear deexcitation of 0.004, 0.0015, 0.0020, 0.0010 and 0.0012 photons/sq cm per sec per ster are determined. A possible weak line at 400 keV was also detected in the direction of the Crab Nebula, and is attributed to a possible gravitational redshift of the 511-keV positron annihilation line. It is concluded that increases in exposure time and detection sensitivity are necessary to detect gamma-ray lines with predicted intensities on the order of 0.00001 photons/sq cm per sec per ster.
Hirasima Y.
Murakami Hitoshi
Okudaira Kiyoaki
Watanabe Hiroko
Yoshimori Masato
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