N¹⁵(p, n)O¹⁵ Ground-State Reactions and the Quasielastic Model of (p, n) Reactions

The N¹⁵(p, n)O¹⁵ reaction has been studied from 3.95 to 9.0 MeV using a "long counter." Absolute cross sections and angular distributions have been measured from 0° to 170° in 10° steps. The analysis of the angular distributions has been done using the optical-model potential suggested by Lane which is a function of the isotopic spins of the incident proton and target nucleus. The calculations were made using a distorted-wave Born approximation and also, for the higher energies, optical-model analysis. The results of these two methods are compared. The excitation function shows broad resonances at 4.30, 5.50, 6.50, 7.65, and 8.99 MeV. With the exception of the resonance at 4.30 MeV, all the others can be interpreted as due to single-particle resonances. A tentative assignment of l and J values is given.