An investigation of the differential cross section for elastic scattering of 19.4-Mev protons by nuclei of T,He3, He4, N14, and O16

The differential cross section has been measured for elastic scattering of 19.4-Mev protons by nuclei of T, He³, He⁴, N¹⁴, and O¹⁶. The proton source was a linear accelerator. The protons were scattered on A gas target at pressures from 520 to 620 mm Hg. The scattered protons were recorded by two CsI(T1) crystal scintillation counters. The differential cross sections for T, He³, and He⁴ have about the same variation, but the minimum for He⁴ is somewhat higher and is displaced in the direction of small angles. At small angles the cross section for T is considerably higher than for He³ and He⁴.The differential cross sections for N¹⁴ and O¹⁶ are also of similar structure, but the depth of the minima and height of the maxima are greater for O¹⁶ than for N¹⁴. Comparison of our data with that of other authors shows that as the atomic number increases for a given proton energy, the positions of the minima for all elements are displaced towards smaller angles. As the energy of the scattered protons increases, the minima in the differential cross section for T and He³ is displaced towards larger angles, whereas for all heavier nuclei this displacement is towards smaller angles.In conculsion the authors express their gratitude to L. V. Kurchatov, K. D. Sincinikov, E. K. Zavoisky, and A. P. Klyucharev for valuable advice and constant attention to the work, to P. V. Chikin who carried out the work on the clectronic circult, and to the maintenance personnel of the accelerator under the direction of A. M. Smirnov, and to A. L. Bazi for discussion of the results.