Summary

This paper details the successful artificial disintegration of lithium atoms and the observation of resulting energetic protons, achieved by Ernest Walton and John Cockcroft using their newly developed particle accelerator. The central thesis is the demonstration that atomic nuclei can be artificially broken apart by energetic particles, specifically protons, initiating nuclear reactions and producing secondary energetic particles. The work validates the Cockcroft-Walton voltage multiplier as a device capable of generating the high voltages necessary for accelerating particles to sufficient energies for nuclear transmutation.

The authors present the experimental setup, including the accelerator and detection methods, and discuss the observed energy spectra of the emitted protons. They conclude that the process involves the absorption of an accelerated proton by the lithium nucleus, followed by its disintegration into two alpha particles and a free proton, with an accompanying release of energy consistent with mass-energy equivalence. The publication marks a foundational experiment in nuclear physics, proving that controlled nuclear reactions were achievable and paving the way for future particle accelerators and nuclear energy research.

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Key concepts

Artificial Disintegration — The process of transforming one element or isotope into another through bombardment with subatomic particles.
Cockcroft-Walton Generator — A type of voltage multiplier circuit that produces high direct current voltages from a lower alternating voltage source.
Nuclear Transmutation — The conversion of one chemical element or isotope into another.
Mass-Energy Equivalence (E=mc²) — The principle, demonstrated by the energy released in the reaction, that mass and energy are interchangeable.