i06 E. WI GNER energy by a suitable constant,~8 or by allowing the particles to interact at a greater distance than they really do. With (2b) we found that multiplying the potentials by 1.36 yields a function for the sum of all energies which has a minimum value of -246 mc' at o =0.80 (taking =o since very little improvement is obtained from varying both r and o independently). The second method (method (i)) is believed to be somewhat more reliable. With (2b) the radius of action must be

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... ed by the factor 1.3 to make the minimum value of E(O") agree with experiment. The minimum is assumed at o-=1.01 (again taking o-=r for the same reason as before). To obtain the numerical results discussed in the text we use the values Lvm = 15.74, Xv~= 1.41, Lvv = 10.05, Xvv =0.90, L, =0.892, E, =0.055, Method (i). (24) CE(s) = 1.09, CE(ps) = 1.63, 3(1 g)D(o o )A v/ = 14.95