Created attachment 799 [details] Geant4.10.7 antiprotons TestEm0 output Hi, After updating from 10.7 to 11.03, I discovered that the ionization cross section for low-energy antiprotons (100 keV) became 0 instead previous Mb value. My target was He gas. Itβs possible to check this by running the TestEm0 example. Best wishes, Volodymyr
Created attachment 800 [details] Geant4.11.03 testEm0 output