Elsevier

Physics Letters B

Volume 64, Issue 1, 30 August 1976, Pages 33-35
Physics Letters B

Charge density of 4He

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Abstract

New data on elastic electron scattering from 4He at medium momentum transfers are presented. The charge density and rms-radius (1.674 ± 0.012 fm) are obtained from a model-independent analysis of all available electron scattering data. Together with previous μ-4He data this allows to verify the QED vacuum polarization term to ±0.25%.

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Work supported in part by the Office of Naval Research Contract 225 (67) and ERDA Contract AT-(40-1)-4043.

Supported by the Swiss National Science Foundation.

∗∗

Present address: 272 Grantwood Drive, Amherst, Mass. 01002, USA.

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