Resonance fluorescence is used for measuring the widths of 13 levels in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ below 10.4 MeV among which nine $E2$ transitions were identified. The total $E2$ strength of those nine levels together with some other known $2^{+}$ levels below 10 MeV exhausts ∼22% of the energy weighted sum rule. The partial and total widths of the strong $M1$ state at 10.32 MeV are compared with theory.

NUCLEAR REACTIONS ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$($\gamma$,${\gamma }^{\prime }$), $E=8.5, 11.3, 11.7$ MeV bremsstrahlung. Deduced ${\Gamma }_0$, $\Gamma \left(E2\right)$, $\Gamma \left(M1\right)$. Natural target.

• Received 29 October 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1824