Characteristic resonancelike peaks recently observed in the angle-integrated inelastic cross sections for the ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$-${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ system are understood in terms of the Landau-Zener excitation mechanism at energy level crossings. Angle-integrated inelastic cross sections estimated with the Landau-Zener formula show a series of resonancelike peaks as a function of incident energy, of which is associated with a grazing angular momentum of the relative motion between nuclei. Simple expressions are given for resonance energies and "widths" of new "resonances." This resonance mechanism is a new one, which has not been known in nuclear reactions nor in atomic collisions, although it is based on the well-known Landau-Zener promotion mechanism.

NUCLEAR REACTIONS ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$-${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ inelastic scattering. New Heavy-ion resonance mechanism. Nuclear Landau-Zener excitation mechanism at level crossings. Molecular single-particle effects.

• Received 24 June 1983

DOI:https://doi.org/10.1103/PhysRevC.28.2316