It is shown that in order to describe some properties of the ${\mathrm{F}}^{20}$ ground state, the $K=1\mathrm{}$ and $K=2\mathrm{}$ states of the Nilsson model must be strongly mixed. The primary ingredient in the description is, therefore, the rotational Coriolis term rather than the interaction between the odd neutron and odd proton.

• Received 17 June 1963

DOI:https://doi.org/10.1103/PhysRev.132.1146