Experiments with high velocity positive ions

摘要: It would appear to be very important develop an additional line of attack on problems the atomic nucleus. The greater part our information structure nucleus has come from experiments with α-particles and if we can supplement these sources positive ions accelerated by high potentials should have experimental weapon which many advantages over α-particle. would, in first place, much intensity than α-particle sources, since one microampere is equivalent, so far as numbers particles concerned, 180 grams radium equivalent. addition advantage being free penetrating β γ rays are a complication experiments, whilst velocity variable at will. main difficulty obtaining such lies course production application necessary accelerate velocities approaching that obtained. For example, polonium energy corresponding 5.2 million electron volts potential 2.6 required give helium equal amount energy. We therefore decide what minimum acceleration voltage usefully work, difficulties increase rapidly increasing voltage. In making this decision naturally guided recent theoretical work Gamow “ Theory Artificial Disintegration.” On Gamow’s theory probability v entering number Z, after coming within effective radius nucleus, W = e -16π 2Z/ hv Jk, Where Jk function varying slowly Z. clear, therefore, for lighter particle chance penetration into choose protons source reason.