Linear-polarization and angular-distribution measurements have been made on the three transitions from the 1.459-MeV level in ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ using inelastic proton scattering. The mixing ratios were determined to be $-0.1<{\delta }_{\frac{M2\mathrm{}}{E1\mathrm{}}}<0.0\mathrm{}$ for the 1.459→ 0.197-MeV transition, $0.30<\mathrm{}{\delta }_{\frac{E2\mathrm{}}{M1\mathrm{}}}<0.38\mathrm{}$ for the 1.459→ 0.110-MeV transition, and $\left|{\delta }_{\frac{M2\mathrm{}}{E1\mathrm{}}}\right|<\mathrm{}0.06\mathrm{}$ for the 1.459→ 0-MeV transition. The results indicate that the level in question cannot be explained as a $p_{\frac{1}{2}}$ proton hole coupled to the pure ground-state rotational band as has been accepted in the past.

• Received 5 April 1971

DOI:https://doi.org/10.1103/PhysRevC.4.317