Electron scattering from excited states inN14andBe9

Electron scattering form factors have been measured for the first six excited states in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and for the 2.429-MeV (${\frac{5}{2}}^{-}$) level in ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$. The form factors for the lowest $T=1\mathrm{}$ level in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ along with the previously measured ground-state magnetic moment are used to specify the $T=0\mathrm{}$ and $T=1\mathrm{}$ wave functions for the mass-14 system assuming two $p$-shell valence particles in an $\mathrm{LS}$-coupling basis. The amplitudes of the various configurations so derived are generally in poor agreement with previous determinations, although the present wave functions yield values of the lifetime of the first $T=0\mathrm{}$ state in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and of the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ ground-state quadrupole moment that are in excellent agreement with previous measurements. The present data are not sufficiently precise to allow a direct separation of the $T=0\mathrm{}$ and $T=1\mathrm{}$ components for the first four negative-parity excited states. However, for two of these states which are excited primarily by $C1\mathrm{}$ transitions, a comparison of the radiative strengths determined in this experiment with previous lifetime measurements sets a lower limit of 2% for the $T=1\mathrm{}$ admixture.