“…The element of fluorine has only one stable isotope 19 [20] in the ranges of 3.87 < E n < 6.16 MeV and 14.18 < E n < 21 MeV, but they agree well with the results measured by Durusoy et al [21]. The 19 F(n, p) 19 O channel becomes available when E n > 4.25 MeV.…”