Isoscalar Character of theJπ=6+,Ex=5.125MeV State inNi58

Transverse ($E6\mathrm{}$) and longitudinal (C6) cross sections for the excitation of the $J^{\pi }=6^{+}$, $E_x=5.125\mathrm{}$ MeV state in ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ were measured by means of inelastic electron scattering. The deduced isoscalar component of the particle-hole wave function is found to be two orders of magnitude greater in amplitude than the isovector. This implies that the particle-hole isospin is relatively pure $\tau =0\mathrm{}$ and is not significantly mixed with $\tau =1\mathrm{}$.