Total nuclear reaction probability of 270 to 390 [sup 14]N ions in Si and CsI

A magnetic spectrograph and position-sensitive detectors were used to measure the total nuclear reaction probability [eta][sub [ital R]] for [alpha]+CsI at 116 MeV, [sup 14]N+CsI at 265 and 385 MeV, and [sup 14]N+Si at 271 and 390 MeV. From these [eta][sub [ital R]]'s, average reaction cross sections [sigma][sub [ital R]] were deduced for [alpha] and [sup 14]N on CsI; these agree with optical and strong absorption model predictions. These same models predict [sigma][sub [ital R]]'s for [sup 14]N+Si which vary by nearly a factor of 2; our measurement favors the smaller predictions.