StrongE2andM1transitions inCa40

Abstract

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.