The muons actually have to be travelling at relativistic speeds to reach the cloud chamber because without time dilation, they don't last long enough. Alpha particles are high-mass and make straight, ...

resulting in streaks in the cloud chamber showing you the particle's path. In this setup, you can see all sorts of particles, ...

The muons actually have to be travelling at relativistic speeds to reach the cloud chamber because without time dilation, they don't last long enough. Alpha particles are high-mass and make straight, ...