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Double Scattering of High-Energy Protons by Hydrogen and Carbon

Physical Review1953Vol. 91(2), pp. 419–420

Citations Over TimeTop 10% of 1953 papers

C. L. Oxley, W. F. Cartwright, I. Rouvina, E. Baskir, D. Klein, J. Ring, W. Skillman

Abstract

Measurements have been made of the asymmetry in the second scattering of protons first scattered from an internal target in the 240-Mev proton beam of the cyclotron. Referring to Fig. 1, protons scattered at 27° are collimated, selected roughly in energy, and pass into a second-scattering apparatus outside the cyclotron vacuum tank. This apparatus is rigidly mounted in a cylindrical can rotatable about an axis which can be made to coincide with the direction of the protons from target I. The useful beam is defined by a cylindrical scintillation counter on the axis. Further, with a polyethylene second target a p—p scatter is detected by quadruple coincidence among the beam defining counter, a two-counter telescope detecting the protons scattered into a range about 27°, and a counter for the low-energy recoil. An exploratory counter 15 inches behind the beam-defining counter is used in coincidence with it to align the beam with the mechanical axis of the can to better than 0.4°. The beam spread determined by this method is 2° and is approximately symmetric. Target II is $\frac{2}{3}$ the diameter of the beam-defining counter, and both are optically set on axis. As expected from these dimensions, the quadruple rate was insensitive to small displacements of the second target from the axis.

Citations Over TimeTop 10% of 1953 papers

Abstract

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