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A High Resolution Measurement of the 2.223 MeV Neutron Capture Line in a Solar Flare

Prince, Thomas A. and Ling, James C. and Mahoney, William A. and Riegler, Guenter R. and Jacobson, Allan S. (1982) A High Resolution Measurement of the 2.223 MeV Neutron Capture Line in a Solar Flare. Astrophysical Journal, 255 (1). L81-L84. ISSN 2041-8205. doi:10.1086/183773.

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An intense solar flare lasting 40 s was observed by the HEAO 3 γ-ray spectrometer on 1979 November 9 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 ± 0.0010 MeV. The precise energy measurement provides unambiguous evidence that this is the ^1H(n,γ)^2H 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.

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Prince, Thomas A.0000-0002-8850-3627
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Additional Information:© 1982 The American Astronomical Society. Received 1981 November 4; accepted 1981 December 23. The authors acknowledge helpful comments and suggestions from a number of colleagues including E. Chupp, H. Hudson, E. Stone, R. Vogt, and J. Willett. This work was carried out at the California Institute of Technology under NASA grant NGR 05-002-160 and at the Jet Propulsion Laboratory under NASA contract NAS 7-100. Space Radiation Laboratory SRL ID #: 1981-30.
Group:Space Radiation Laboratory
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NASANGR 05-002-160
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Space Radiation Laboratory1981-30
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ID Code:45076
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Deposited On:23 Apr 2014 19:25
Last Modified:10 Nov 2021 17:00

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