Letter | Published:

Proton–Proton Scattering at 146 MeV.

Naturevolume 168pages468469 (1951) | Download Citation



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.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Adams, J. B., Edmunds, A. O., and Hill, K. J., A.E.R.E. Report G/R 681.

  2. 2

    Powell, W. M., Henrich, L. R., Kerns, Q. A., Sewell, D. C., and Thornton, R. L., Rev. Sci. Instr., 19, 506 (1948).

  3. 3

    Bloembergen, N., and van Heerden, P. J. (private communication, Feb. 28, 1951).

  4. 4

    Aamodt, L., Peterson, V., and Phillips, R. (private communication, Feb. 27, 1950).

  5. 5

    Birge, R. W., Phys. Rev., 80, 490 (1950).

  6. 6

    Oxley, C. L., Schamberger, R. D., and Towler, jun., O. A., Phys. Rev., 82, 295 (1951).

  7. 7

    Chamberlain, O., Segrè, E., and Wiegand, C., Bull. Amer. Phys. Soc., 26, 27 (1951).

  8. 8

    Chamberlain, O., Segrè, E., and Wiegand, C., Phys. Rev., 81, 284 (1951).

  9. 9

    Jastrow, R., Phys. Rev., 81, 636 (1951).

Download references

Author information


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

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


  1. Search for J. M. CASSELS in:

  2. Search for G. H. STAFFORD in:

  3. Search for T. G. PICKAVANCE in:

About this article

Publication history

Issue Date



Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.