Analytic estimates of the product yields for nuclear reaction in the ultralow energy range

Simple analytic expressions for estimation of product 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 large spread of incident beam energies, these expressions can be factorized and naturally define the effective target thickness and the range of particle collision energies in the entrance channel that in turn defines the yield of reaction products.