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Surprisingly Intense Neutron Emission from a Flare Behind the Limb of the Sun

R.J. Murphy, G.H. Share, K. W. DelSignore, X.-M. Hua

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The Oriented Scintillation Spectrometer Experiment on board the Compton Gamma Ray Observatory observed a strong flux of neutrons from the behind-the-limb flare that occurred on 1991 June 1. This is surprising if the neutrons were produced by thin target interactions in the Sun's corona as suggested by gamma-ray observations made by Granat/PHEBUS of this flare. We compare neutron and gamma-ray observations of the June 1 flare with thick target emissions observed from a flare three days later where the interactions took place in the chromosphere and photosphere. A very hard spectrum for the accelerated particles is required to account for the number of neutrons observed on June 1 if they were produced by thin-target interactions in the corona.