Nuclear resonance fluorescence experiments with linearly polarized bremsstrahlung were performed to determine parities of strong dipole transitions in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$. A total of 14 transitions—ten of them previously unknown—in the energy range from 4.7 to 10.2 MeV could be identified. From this experiment it is evident that the main dipole strength to bound states is due to E1 excitations. An upper limit of B(M1)↑<0.5 ${\mu }_{\mathrm{N}{}^2}$ was found for individual magnetic dipole excitations in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ in the energy region below neutron threshold.

• Received 17 January 1986

DOI:https://doi.org/10.1103/PhysRevC.34.835