Results are reported from observations of the 511 MeV annihilation gamma-ray line from the Galactic center, made on May 22, 1989 with a high-resolution gamma-ray spectrometer on board a balloon launched from Alice Springs (Australia). The observations were made at about 4 gm/sq cm atmospheric depth for 6 hrs in a series of target and background pointings lasting 20 min each. The results obtained from multiparameter Gaussian fits to the data were as follows: 511 keV flux = 0.00089 + or - 0.00027 ph/sq cm per sec-rad, line width of about 1.1 keV, and less than 3.2 keV FWHM at 95 percent confidence.


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    Title :

    An observation of annihilation radiation from the Galactic center region


    Contributors:
    Matteson, J. (author) / Pelling, M. (author) / Peterson, L. (author) / Bowman, B. (author) / Briggs, M. (author) / Lingenfelter, R. (author) / Lin, R. (author) / Smith, D. (author) / Feffer, P. (author) / Pehl, R. (author)

    Published in:

    Publication date :

    1991-01-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    An observation of annihilation radiation from the Galactic Center region

    Matteson, J. / Pelling, M. / Peterson, L. et al. | Elsevier | 1991




    Galactic Positron Annihilation Radiation

    Kurfess, J. D. / International Council of Scientific Unions | British Library Conference Proceedings | 2000


    Observations of Diffuse Galactic Positron Annihilation Radiation

    Briggs, M. S. / Gruber, D. E. / Matteson, J. L. et al. | British Library Conference Proceedings | 1993