I would give a pellet gun a try, if you have one. Doesn't make too much noise, and the majority of them aren't powerful enough to kill a raccoon.
Just sneak out at night and spotlight up the tree. You'll see their beady little eyes staring back at you. As long as they don't have a deep hollow to hide in, they will probably make a run for it once you shoot them. (if they do have a good hiding spot, then this isn't going to work)
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