Total nuclear reaction probability of 270 to 390N14ions in Si and CsI

A magnetic spectrograph and position-sensitive detectors were used to measure the total nuclear reaction probability ${\mathrm{\eta }}_{\mathit{R}}$ for α+CsI at 116 MeV, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$+CsI at 265 and 385 MeV, and ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$+Si at 271 and 390 MeV. From these ${\mathrm{\eta }}_{\mathit{R}}$’s, average reaction cross sections ${\mathrm{\sigma }}_{\mathit{R}}$ were deduced for α and ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ on CsI; these agree with optical and strong absorption model predictions. These same models predict ${\mathrm{\sigma }}_{\mathit{R}}$’s for ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$+Si which vary by nearly a factor of 2; our measurement favors the smaller predictions.