What was Cockcroft's main theory or idea?
My central idea was that atomic nuclei could be disintegrated by artificially accelerated particles, provided those particles had sufficient kinetic energy to overcome the Coulomb barrier. This was not a grand theoretical leap but a practical extension of Ernest Rutherford's earlier work. Rutherford had shown that alpha particles from natural radioactive sources could occasionally hit and split nuclei, but the process was inefficient. I reasoned that if we could accelerate protons—hydrogen nuclei—to high velocities using a voltage multiplier, we could produce far more controlled and reproducible nuclear reactions. The evidence from our experiments with lithium and later with other light elements confirmed this. We must not rush to conclusions, but the data clearly showed that nuclear transformations could be engineered. This idea underpins all particle accelerators used today in physics, medicine, and industry.
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