Since almost all de-excitation lines from nuclear states excited by flare-accelerated protons and α $\alpha $ -particles are emitted promptly after nuclear collisions, the emission photon’s energy depends on the velocity of the recoiling nucleus. The energies and widths of γ $\gamma $ -ray lines provide a wealth of information on the directionality and spectra of ions in solar flares. In this paper, we use TALYS code to improve the cross sections of γ $\gamma $ -ray lines production, and calculate the shapes of the 1.634 MeV line from de-excitation of 20Ne as a function of ion’s energy spectra and the heliocentric angle. Taking this line shape as an example, we try to develop a new method of line shape analysis to study the properties of accelerated ions in solar flares.
Astrophysics and Space Science – Springer Journals
Published: Aug 2, 2017
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