Multistep processes in theF19(O16,N15)Ne20reaction

Abstract

An exact-finite-range coupled-channels Born-approximation analysis, which takes into account multistep processes, was made of the reaction $^{19}\mathrm{F}$($^{16}\mathrm{O}$, $^{15}\mathrm{N}$)$^{20}\mathrm{Ne}$ (${0}^{+}$, ${2}^{+}$, ${4}^{+}$). Good fits to data were obtained not only for the ${0}^{+}$ and ${2}^{+}$ state cross sections, but also for the ${4}^{+}$ state which is forbidden in a one-step process. Deviation of the distorted-wave Born-approximation result from the coupled-channel Born-approximation result was observed even for the allowed transition to the ${0}^{+}$ and ${2}^{+}$ states.NUCLEAR REACTIONS $^{19}\mathrm{F}$($^{16}\mathrm{O}$, $^{15}\mathrm{N}$), $E=68$ MeV calculated $\ensuremath{\sigma}(\ensuremath{\theta})$ with CCBA and DWBA.