In the framework of the $\alpha$-deuteron cluster model, the $J=1\mathrm{}$ deformation is considered in the phenomenological wave function of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ so as to produce the charge form factor and the quadrupole moment at the same time. In our model the deviation from the $S$ state of the relative motion between the $\alpha$ particle and the deuteron compensates the quadrupole moment of the free deuteron, $Q_d^{\exp }=+0.278\mathrm{}\pm 0.008$ ${\mathrm{fm}}^2$, to give that of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, $Q_{\mathrm{Li}}^{\exp }=-0.08\mathrm{}\pm 0.008$ ${\mathrm{fm}}^2$. It is shown that the quadrupole contribution plays an important role in filling up the diffraction minimum around $q^2=8\mathrm{}$ ${\mathrm{fm}}^{-2\mathrm{}}$ in the elastic charge form factor.

• Received 27 April 1970

DOI:https://doi.org/10.1103/PhysRevC.3.1023