Hi, I was recently trying to interpret some very strange results obtain using the G4BinaryLightIonReaction model. I was simulating the passage of C, N, O beams (~700MeV/amu) through a thin carbonaceous material (plastic scintillator). For the Carbon beam the results (ie. number transmitted primary ions) were sensible whereas those for N and O beams were much lower than expected. Whilst simulating with visualisation most, if not all, products originating from N,C or O,C reactions were emitted in the direction contrary to that of the primary beam. I tried this out with a number of projectile/target combinations and observed similar results. In G4BinaryLightIonReaction::ApplyYourself the target and projectile are swapped if the projectile is heavier than the target. Perhaps there is a problem with this swapping procedure (or in the re-transformation of products after the reaction)?? Best Regards, Iwan
a known problem. I inverse kinematics target lighter than projectile). We are working to fix it. Many greetings, Hans-Peter.
Finally managed to identify this. It was a wrong orientation of the Breit frame in iverse kinematics. Will be fixed in 6.2. Many greetings, Hans-Peter.
