Letter | Published:

Proton–Proton Scattering at 146 MeV.

Naturevolume 168pages468469 (1951) | Download Citation

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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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References

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Affiliations

  1. Atomic Energy Research Establishment, Harwell, Didcot, Berks.

    • J. M. CASSELS
    • , G. H. STAFFORD
    •  & T. G. PICKAVANCE

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https://doi.org/10.1038/168468a0

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