Analytical estimates of the nuclear reaction yields in the ultralow energy range

Simple analytical expressions for estimation of yields from reactions between light nuclei in the ultralow collision energy range are given. It is shown that even in the case of total absorption targets and a large spread of incident beam energies these expressions can be factorized and define, in natural manner, the concepts of effective target thickness and the range of particle collision energies in the entrance channel that in turn define the yield of reaction products