Low-Lying States ofF19

The core-particle coupling model employed in a previous paper for the interpretation of the low-lying positive-parity states of ${\mathrm{Ne}}^{21}$ is applied to ${\mathrm{F}}^{19}$. The lowest positive-parity states of ${\mathrm{F}}^{19}$ are investigated in terms of the coupling of a $2s-1d$ hole to the ${\mathrm{Ne}}^{20}$ core. Satisfactory agreement with experimental results is obtained for parameters which compare well with the parameters used in ${\mathrm{Ne}}^{21}$. The negative-parity states of ${\mathrm{F}}^{19}$ require the coupling of both a $2s-1d$ and a $1p$ hole. The large number of parameters in this model does not allow any definite conclusions for this case, though the preliminary results yield a reasonable interpretation of the $E1\mathrm{}$ and $E3\mathrm{}$ transition data.