α -cluster structure in F 19 and Ne 19 in resonant scattering

The nuclear structure of F19 and Ne19 is important for understanding of α clustering in the A=20 mass region and in questions related to astrophysics. However, the only high-resolution broad angular and energy range study of the F19 resonance structure in α+N15 scattering was published over 60 years ago, and a detailed analysis of complex excitation functions of overlapping resonances with several decay channels was simply impossible at that time. We performed a modern R-matrix analysis of these old data to assign spins and specify resonant parameters of levels up to excitation energy of 8.2 MeV in F19. We successfully tested our R-matrix parameters in a fit of the recent data on α+N15 obtained by thick target inverse kinematics (TTIK) method at 180 degrees. We used the new parameters for F19 to fit TTIK data for α+O15, the mirror resonant reactions. The comparison of the data for isobaric mirror resonant reactions provides an interesting insight into the nuclear structure.