Approximate treatment of electron Coulomb distortion in quasielastic (e,e{prime}) reactions

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:374657

Yanhe, J; Kim, K S; Wright, L E

The authors consider the adequacy of various approximate methods of including Coulomb distortion effects in (e,e`) reactions by comparing to an exact treatment using Dirac-Coulomb distorted waves. In particular, they examine approximation methods and analyses of (e,e`) reactions developed by Traini et al. using a high energy approximation (HEA) due to Lenz and Rosenfelder. This approximation has been used in the separation of longitudinal and transverse structure functions in a number of (e,e`) experiments including the newly published {sup 208}Pb(e,e`) data from Saclay. The authors find that the assumptions used by Traini and others are not valid for typical (e,e`) experiments on medium and heavy nuclei, and hence the extracted structure functions are not reliable. Based on HEA, they describe an improved approximation and at each step they compare their approximate results to the exact distorted wave results and can therefore quantify the errors made by their approximations. They find that for nuclei up to the iron region, they can get an adequate treatment of Coulomb distortion effects just by using a good approximation to the distorted waves, but for heavy nuclei the phase shifts have to also be approximated. Based on these results, the authors discuss how to extract structure functions from measured (e,e`) cross sections.

• OSTI ID: 374657
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COULOMB CORRECTION
ELECTRON REACTIONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
LEAD 208 TARGET
QUASI-ELASTIC SCATTERING
STRUCTURE FUNCTIONS