States in ${}_{}{}^{35,36}{}_{}{}^{}\mathrm{Cl}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{K}$, and ${}_{}{}^{41}{}_{}{}^{}\mathrm{Ca}$ decaying predominantly by $M2$ transitions were excited in oxygen induced fusion-evaporation reactions. Their lifetimes were determined by means of the recoil distance Doppler shift technique. A survey on $M2$ transitions between the $1f_{\frac{7}{2}}$ and the $1d_{\frac{3}{2}}$ shell in $33\le A\le 47$ nuclei is presented and the retardations of these transition strengths are discussed. A correlation between the reduced $M2$ matrix elements and the transition energies has been established.

NUCLEAR REACTIONS ${}_{}{}^{25}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},\mathrm{xy}\gamma )$, 30-50 MeV; measured $E_{\gamma }$, $I_{\gamma }$, recoil distance Doppler shift. ${}_{}{}^{36}{}_{}{}^{}\mathrm{Cl}$ deduced branching ratio, ${}_{}{}^{35,36}{}_{}{}^{}\mathrm{Cl}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{K}$, ${}_{}{}^{41}{}_{}{}^{}\mathrm{Ca}$ deduced $T_{\frac{1}{2}}$. Enriched target.

• Received 11 March 1976

DOI:https://doi.org/10.1103/PhysRevC.14.160