Cross sections relevant to gamma-ray line emission in solar flares: 3He-induced reactions on 16O nuclei
V. Tatischeff, J. Duprat, J. Kiener, M. Assuncao, A. Coc, C. Engrand, M. Gounelle, A. Lefebvre, M. -G. Porquet, N. De Sereville, J. -P. Thibaud, C. Bourgeois, M. Chabot, F. Hammache, J. -A. Scarpaci
Abstract
Gamma-ray production cross sections have been measured for gamma-ray lines copiously emitted in the 3He bombardment of 16O nuclei: the 937, 1042 and 1081 keV lines of 18F and the 1887 keV line of 18Ne. Four Ge detectors with BGO shielding for Compton suppression were used to measure the angular distributions of the gamma-rays. The excitation functions have been obtained for 3He bombarding energies from 3.7 to 36 MeV. Total cross sections are tabulated for calculations relevant to gamma-ray astronomy. The importance of these lines as diagnosis for the presence and properties of accelerated 3He in solar flares is discussed in light of the measured cross sections.
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