The Scattering of 31.5-Mev Protons from Several Elements

Roy Britten
Phys. Rev. 88, 283 – Published 15 October 1952
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Abstract

The elastic and inelastic scattering of 31.5-Mev protons from the Berkeley linear accelerator from Be, C, Al, Pb, and Pt have been observed, using a sodium iodide (Tl) crystal and photomultiplier for particle detection and energy measurement. Inelastic scattering led to the excitation of states or closely spaced groups of states at 2.5, 6.8 and 11.6 Mev in beryllium; 4.3, (7.5), and 9.5 in carbon; and a group of states between 11 and 17 in carbon. Deuterons have been observed from the reaction C12(p,d)C11, leading to the ground state of C11. Differential cross sections have been measured for all these reactions at two or three angles. The differential cross sections for the elastic scattering of 31.5-Mev protons have been measured at several angles for Be9, C12, Al27, and Pb. A comparison with the results of calculations based on several different nuclear models is made. The extreme sensitivity of the calculated cross sections (in the backward hemisphere) to the individual phase shifts and amplitudes indicates that moderately rough measurements of the backward scattering cross sections of nuclei for neutrons in this energy range would give accurate determinations of the individual phase shifts.

  • Received 30 January 1952

DOI:https://doi.org/10.1103/PhysRev.88.283

©1952 American Physical Society

Authors & Affiliations

Roy Britten*,†

  • Palmer Laboratory, Princeton University, Princeton, New Jersey

  • *Now at the Department of Terrestrial Magnetism, Carnegie Institution of Washington.
  • U. S. Public Health Service-National Cancer Institute Predoctorate Fellow during the period in which this work was carried out.

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Vol. 88, Iss. 2 — October 1952

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