Upper limit on the steady emission of the 2.223 MeV neutron capture gamma-ray line from the sun

Details Upper limit on the steady emission of the 2.223 MeV neutron capture gamma-ray line from the sun Upper limit on the steady emission of the 2.223 MeV neutron capture gamma-ray line from the sun

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142..171h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 142, no. 1, p. 171-185.

Physics

7

Gamma Rays, Nuclear Capture, Solar Flares, Solar Neutrons, Solar Spectra, Solar Corona, Solar Protons, Tritium

Scientific paper

A search for steady emission of the 2.223 MeV gamma-ray line arising from the direct capture reaction 1H(n, gamma)2H is presented on the basis of an analysis of SMM data. The upper limits for continuous 2.223 MeV gamma-ray line emission from the active and inactive sun, as established in the present work, are about two orders of magnitude less than previously published results. These findings for inactive periods also suggest that small flares (or a continuous acceleration mechanism) are unlikely to be the source of the heating of the quiet solar corona. It is concluded that the power in accelerated nuclei during inactive periods falls short of the coronal heating requirement by about four orders of magnitude unless there is a large and as yet unobserved population of nuclei at energies below 1 MeV. The energy release in other forms associated with the acceleration process falls short of the heating requirement by about two orders of magnitude if this energy release is in the same proportion to the power in accelerated nuclei as is estimated from observed flares.

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