Pion and proton cross section from the 246 MeV/nucleon 139La + 139La reaction

The pion production cross section for the inclusive reaction La + La → π- was measured at an incident energy of 246 MeV/nucleon at 900 in the center of mass. To check for isotropy the pion production cross section was also measured at 500 in the C.M. The inclusive proton cross section was measured at 900 in the center of mass for the same heavy beam - target system and is reported here. We found no change in the slope of the pion cross section at 900 in the C.M. where recent theory predicts a dramatic effect up to a limit of E/sub C.M./ = 550 MeV