An investigation of excited states in the oxygen-17 and nitrogen-14 nuclei by bombardment of carbon-13 with alpha particles and protons

Abstract

The purpose of this study is the investigation of the levels in the compound nucleus O17* from an excitation energy of 8.25 Mev to 10.35 Mev by the elastic scattering of alpha particles from C 13. The present work was undertaken in order to complete the assignment of spins and parities. The energy range covered experimentally was from 2.5 Mev to 5.2 Mev alpha particles, which corresponds to excitation energies from 8.25 Mev to 10.35 Mev. For these energies data was taken at four center of mass angles; an analysis of this data was made using the Wigner single-level dispersion-theory form for the scattering matrix. Since the ground state of C13 is 1/2-, and the spin and parity of an alpha particle is O+; the channel spin for this problem is 1/2. For this case the theoretical expression for the differential cross section can be reduced to a compact form for analysis.