12C + 12C large angle elastic scattering at 240 MeV

Abstract The measurement of the differential cross sections of the 12 C + 12 C and the 13 C + 12 C elastic scattering are carried out at the 12 C energy 240 MeV and the 13 C energy 250 MeV to solve some interpretation problem of the 12 C + 12 C scattering data. Is it possible that the 1 st Airy minimum in 12 C + 12 C scattering data is missing? Our analysis shows that the positions of the 1 st Airy minima obtained in former measurements are confirmed.