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  • SPACE RADIATION  (2)
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  • 1
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    Experimental limits on the radiative decay of SN 1987A neutrinos (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: SMM gamma-ray spectrometer data are examined to look for gamma-ray emission coincident with the about-10-s neutrino burst from SN 1987A. The absence of a detectable signal suggests that the energy radiated into MeV gamma rays by neutrino decay (or any other process) is less than 10 to the -10th of that in supernova neutrinos above 9 MeV. The results are used to set a direct limit on the lifetime of any massive neutrino type generated in the core collapse leading to SN 1987A.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters (ISSN 0031-9007); 62; 505-508
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Gamma rays from clusters of galaxies (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The possibility that Coma-type radio halos are powered by secondary electrons produced during the decay of energetic charge pions is examined. These pions are generated by the collision of cosmic ray protons with thermal ions in the intracluster medium. A calculation of both the cosmic ray concentration and the spectrum needed to power the halo in the Coma cluster is presented. The gamma-ray flux is predicted and it is shown that this model can be tested with the Gamma Ray Observatory Energetic Gamma Ray Experiment Telescope.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop; p 355
    Format: text
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    NASA TECHNICAL REPORTS
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