Rainbowlike effects in (He-3, alpha) reactions

The angular distributions of the elastic scattering and ([sup 3]He,[alpha]) cross sections for 37.9 MeV [sup 3]He particles incident on target nuclei [sup 13]C and [sup 14]C were analyzed from the standpoint of possible presence of the refractive effects in one-nucleon transfer reactions. The analysis of experimental data is given in the framework of the distorted wave Born approximation using external microscopically calculated form factors. The presence of the rainbowlike mechanism in both elastic and reaction channels was observed. The effect is apparent mainly for transitions where strong orbital mismatching occurs.