  Modern cosmic ray transport codes, that are capable of use for a variety of
applications, need to include all significant atomic, nuclear and particle
reactions at a variety of energies. Lepton pair production from nucleus-nucleus
collisions has not been included in transport codes to date. Using the methods
of Baur, Bertulani and Baron, the present paper provides estimates of
electron-positron pair production cross sections for nuclei and energies
relevant to cosmic ray transport. It is shown that the cross sections are large
compared to other typical processes such as single neutron removal due to
strong or electromagnetic interactions. Therefore lepton pair production may
need to be included in some transport code applications involving MeV
electrons.
