Non-reproducibility of the cross sections of the products induced from dissipative reaction of ¹⁹F+²⁷Al

The differential cross sections of the dissipative products B, C, N, O, F, Ne, Na and Mg induced from the reactions of ¹⁹F+²⁷Al at two incident energies have been measured at the HI-13 tandem accelerator, Beijing. In the case of a fixed beam incident energy 114 MeV or 118.75 MeV respectively, identical reaction system and the same detection system, 20 target points in steps of 2 mm on a 10 mm × 50 mm rectangular Al foil have been bombarded. The experimental results indicate that the probability distribution of the cross sections is much wider than a standard Gaussian distribution. This non-reproducibility of the cross sections can't be interpreted by the statistical property of a finite count rate.