Aspherical reactor composed of 239pu metal is operating in a critical steady state. discuss what probably happens to the multiplication of the reactor and why, if the system is modified in the following ways (treat each modification separately, not cumulatively): (a) the reactor is rapidly compressed to one-half its original volume, (b) a large, fat reactor operator accidentally sits on the reactor, squashing it into an ellipsoidal shape, (c) a thick sheet of hafnium is wrapped around the outside of the reactor, (d) the reactor is suddenly immersed in a large container of heavy water, (e) one simply leaves the reactor alone for 1 year.