A predominantly electric storage ring, ``E&m'', with weak superimposed magnetic bending, is shown to be capable of storing two different nuclear isotope bunches, such as helion and deuteron, co-traveling with different velocities on the same central orbit.``Rear-end'' collisions occurring periodically in a full acceptance particle detector/polarimeter, allow the (previously inaccessable) direct measurement of the spin dependence of nuclear transmutation for center of mass (CM) kinetic energies ranging from hundreds of KeV up toward pion production thresholds. These are ``rear-end collisions'' occuring as faster stored bunches pass through slower bunches. An inexpensive facility capable of meeting these requirements is described, with nuclear channel $h + d \rightarrow \alpha + p$ as example.