Elsevier

Nuclear Physics A

Volume 549, Issue 2, 9 November 1992, Pages 197-222
Nuclear Physics A

Large-basis space and mesonic effects on the 7Li form factors

https://doi.org/10.1016/0375-9474(92)90040-QGet rights and content

Abstract

The electron-scattering form factors of 7Li are investigated in the nuclear shell model. Calculations have been performed in the Op-shell-model space as well as in the complete (0 + 2)ħ;ω model space. Meson-exchange-current corrections to the transverse form factors are included. Only in the extended model space we find good agreement with experiment for all calculated form factors up to momentum transfer 3 fm−1. Meson exchange currents enhance the transverse form factors at large momentum transfer, bringing theory considerably closer to experiment. For the transition to the Jπ = 72 second excited state (Ex = 4.63MeV) we find that the high multipoles E4 and M5, which dominate the transverse form factor at momentum transfer q>3fm−1, are mainly induced by meson exchange currents and not by the nuclear structure involved. A comparison of the transverse form factor of the Jπ = 72−1 state to the one of the Jπ = 12 first excited state (Ex = 0.478 MeV) seems to give experimental confirmation of this finding.

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