The Low States ofLi7

Abstract

An attempt is made to obtain consistency between the positive quadrupole moment of ${\mathrm{Li}}^7$ as well as other known ground state data (spin; magnetic moment; ${\mathrm{Be}}^7\stackrel{K}{\to }{\mathrm{Li}}^7$, ${\mathrm{Li}}^7$* lifetime and branching ratio) and the assumption that the wave function belongs to an $s^4{p}^3$ configuration of nucleons. This is found to be possible with only one particular form for the spin and angular dependence of the function. This form is very different from that predicted by previous theory; in particular the $D$ and $P$ state probabilities are found to be 80 percent and 20 percent, respectively. It should be emphasized that the validity of the analysis depends on the accuracy of the assumptions that the quadrupole moment is positive and due only to the charge distribution of the nucleons, with no contribution arising from their interaction.