Elastic Longitudinal Electron Scattering Form Factors of ^11 B

Elastic longitudinal electron scattering form factors have been studied for nB(Jn=3/2 T=1/2) MeV in the frame work of shell model. The multipoles are indicated as CO and C2 . Using the Cohen-Kurath (CK) interaction to give the lp-shell model space wave functions. Core-polarization effects (CP) ; (the effects from outside the lp-shell model space) are included through the first -order perturbation theory. To get a good agreement with the experimental data an extended model (The admixture of 2p-shell wave functions with the lp-shell) are used in our calculations.