# Accession Number:

## AD0632511

# Title:

## STRUCTURE OF THE ALPHA PARTICLE FROM ELASTIC ELECTRON SCATTERING,

# Descriptive Note:

# Corporate Author:

## HIGH ENERGY PHYSICS LAB STANFORD UNIV CALIF

# Personal Author(s):

# Report Date:

## 1966-04-01

# Pagination or Media Count:

## 13.0

# Abstract:

Using a liquid helium target a study was made of elastic electron scattering from He4 at values of q sq., the 4-momentum transfer squared, ranging from 0.5 F to the -2 power to 10.0 F to the -2 power. The results were interpreted in terms of the charge form factor of the alpha particle. Previous Stanford measurements extended up to q sq 6.2 F to the -2 power and were consistent with a Gaussian charge distribution. The form factor values obtained recently by Repellin et al, at Orsay from a measurement of relative cross sections up to q sq. 8 F to the -2 power indicated a deviation both from the earlier Stanford data and from the Gaussian model. The results confirm the original Stanford data but do show a deviation from the Gaussian model for q sq 6 F to the -2 power. The qualitative trend of the deviation is the same as observed by Repellin et al, whereas the absolute form factor values are in disagreement. Among the models which have been found to fit the new data are the Modified Gaussian charge distribution, and the independent particle model using a finite square well. Author

# Descriptors:

# Subject Categories:

- Nuclear Physics and Elementary Particle Physics