Make a drawing to scale of the coulomb potential barrier encountered in the alpha decay of 242cm (z=96) to 238pu(z=94), for which the q=6.217mev. assume r0 =1.5 fm to account for the diffuseness of the nuclear surface. show also the coulomb-plus centrifugal barrier for the i=2 decay to the first excited state (44 kev). now use a tunneling method of some kind to estimate the ratio of the alpha-branching intensities to the gound and first excited state of 238pu.