Elsevier

Physics Letters B

Volume 88, Issues 1–2, 3 December 1979, Pages 13-16
Physics Letters B

The charge form factor of three-nucleon systems and the polarization of the bound nucleon

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Abstract

The discrepancy between theoretical calculations of the 3He charge density and the results derived from elastic electron scattering may be due to the analysis of the experimental data in terms of spherical nucleons. A classical model with deformed nucleons gives qualitive agreement with experiment for an oblate quadrupole moment of −1.8 mb. Such a deformation of the bound nucleon can be described by the admixture of Δ(1232) and higher isobar components with spin 32. Since the admixture probabilities are small the dominant contributions stem from the transition quadrupole moments between free nucleon and isobar components. Taking into account the leading Δ(1232) components one can explain about half of the discrepancy. As this transition operator is isovector, the effects are opposite for 3He and 3H.

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1

Supported by Deutsche Forschungsgemeinschaft, contractEh 4/10.

2

On leave from Università di Genova.

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