Hydrogen discharge tube produce protons, Protons accelerated through a high voltage, Protons strike a lithium target, Two alpha particles are produced, move in opposite directions to conserve momentum and strike a zinc sulphide screen, Scintillations are viewed using a microscope, Li 7 3 + H 1 1= He 4 2 + He 4 2 + energy, Cockroft and Walton received a Nobel Prize in physics in 1951. It was also the first experimental verification of E = mc 2.

Cockroft and Walton Linear Particle Accelerator

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