Abstract
A PROTON beam has been extracted from the 110-in. Harwell cyclotron by scattering the internal beam at a uranium target1. Deflected protons escape from the cyclotron along a path sheltered from the magnetic field by an arrangement of iron bars2; but sufficient field remains to separate outgoing protons of different energies. Protons of 147 ± 1 MeV., as determined by their corrected3 range in aluminium, are selected by slits and passed down an evacuated tube 12.7 metres long to a point behind a concrete screening wall. A flux of 2 × 105 protons-cm.−2-sec.−1 is available at the end of the tube, and this is monitored by an ionization chamber and an integrating D.C. amplifier.
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CASSELS, J., STAFFORD, G. & PICKAVANCE, T. Proton–Proton Scattering at 146 MeV.. Nature 168, 468–469 (1951). https://doi.org/10.1038/168468a0
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DOI: https://doi.org/10.1038/168468a0
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