Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l..81p&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 1, 1982, p. L81-L84.
Astronomy and Astrophysics
Astrophysics
37
Gamma Ray Spectrometers, Heao 3, High Resolution, Neutrons, Nuclear Capture, Solar Flares, Solar Neutrons, Emission Spectra, Hydrogen, Line Spectra, Particle Energy, Satellite-Borne Instruments, Time Dependence
Scientific paper
An intense solar flare lasting 40 s was observed by the HEAO 3 gamma-ray spectrometer on November 9, 1979, at 3:05 UT. The flare was observed in four high-resolution germanium detectors as well as in five CsI shield detectors over an energy range of 100 keV to above 5 MeV. Of particular interest is a line feature at 2.2248 + or - 0.0010 MeV. The precise energy measurement provides unambiguous evidence that this is the (H-1)(n, gamma)(H-2) line resulting from neutron capture on hydrogen. An upper limit of 5 keV is found for the natural line width. The time dependence of the neutron capture line is discussed as well as the overall characteristics of the November 9 flare.
Jacobson Seth A.
Ling James C.
Mahoney William A.
Prince Thomas A.
Riegler Guenter R.
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