destroy on collision or change shape of container

Hello! I’ve been trying out TFD for C4D and loving it. I had one thing I was trying to do that I’m having difficulty with, which is I’d like the particles to be defined by a different shape than the square container.

For example, if I had a half circle around my scene, I don’t want the particles to collide and be affected from a physics standpoint, but to collide and disappear/be destroyed in the same way they are when they reach the edge of the container. Is this possible? Thanks so much!