Accession Number : AD0681054

Title :   THE SCATTERING OF POSITRONS AND ELECTRONS BY NUCLEI.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J PALMER PHYSICAL LAB

Personal Author(s) : Lipkin,H. J.

Report Date : JUL 1950

Pagination or Media Count : 79

Abstract : The scattering at 57.9 deg of one million volt electrons and positrons by thin foils has been investigated experimentally from two points of view: (1) to compare the cross section for elastic nuclear scattering of positrons with that of electrons, and (2) to look for inelastically scattered electrons which have suffered large energy losses. The first is of interest because theory predicts a large difference between positron and electron nuclear scattering resulting from spin orbit coupling. The second is of interest because there have been many experimental reports of such inelastic scattering but no satisfactory theoretical reason for the effect. Values were obtained for the ratio of the electron scattering cross section to that of positrons at three different energies in the one million volt region for foils of platinum and copper. The results were in rough agreement with theoretical predictions, with a consistent deviation which may be attributed to the failure of the theory to include the effects of screening. The investigation of inelastic scattering failed to observe any effect in foils of aluminum, copper, platinum and lead. (Author)

Descriptors :   (*ELECTRONS, *NUCLEAR SCATTERING), (*POSITRONS, NUCLEAR SCATTERING), NUCLEAR CROSS SECTIONS, FOILS(MATERIALS), ELASTIC SCATTERING, INELASTIC SCATTERING, THESES

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE