Seriously, instead of soundproofing your coop and run, moving your chickens into a garage or under a deck, or talking to your neighbors, you are instead choosing to abuse your birds? I find this appalling, and I cannot believe you think this is some kind of scientific experiment. There are no controlled variables here--your chickens do not understand what's happening or why you're hurting them. Why do you have chickens in the first place? What is it that you hope to accomplish by raising your own birds and eggs? Does physical punishment for something they're not capable of reasoning out really work within the parameters of that?
This is what I think it is: 167.315. Animal abuse in the second degree, from the Oregon Cruelty to Animals Statutes.
(1) A person commits the crime of animal abuse in the second degree if, except as otherwise authorized by law, the person intentionally, knowingly or recklessly causes physical injury to an animal.