Low energy antiproton nuclear absorption cross sections

We have studied the absorption cross section of antiprotons on Al, Cu, and Pb for T = 131.6 and 193.6 MeV. These results are compared with predictions of an optical model fitted to antiproton elastic scattering data on these nuclei and are in agreement with these predictions. The cross sections have an exponential dependence on the mass number A with an exponent of approximately 0.61.