CONTEMPORARY ADVANCES IN PHYSICS, XXVIII 



609 



showing the values of e F at which resonance occurs. The linear trends 

 suggest that these may be properties of the nucleus which are suscep- 

 tible of simple interpretations. There are also the estimates of Vm 

 made from observations on alpha-particle scattering, most of which 

 are merely minimum-admissible-values below which Vm cannot lie, 

 while a few are more definite. As for Vm, there is at any rate nothing 



o 



5 222 



O 



O 

 I- 

 < 



218 



85 86 87 88 



ATOMIC NUMBER 



Fig. 21 — Genealogies of the radioactive elements. (The actinium series is plotted 

 some distance above the others for legibility, but almost certainly An should lie one 

 unit below Tn, the rest correspondingly). 



to indicate that we must make it higher than the values — a few times 

 10~^^ cm. — which many reasons impel us to assign to the dimensions 

 of nuclei. 



Thus the quantum-mechanical theory of transmutation is as yet 



