Fusion-evaporation reactions induced by beams of 25-55-Mev ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ on an isotopically enriched ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ target have been used to populate high-spin yrast levels in ${}_{}{}^{59-60}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{59-60}{}_{}{}^{}\mathrm{Co}$. Measurements consisted of $\gamma$-ray excitation functions, angular distributions, $\gamma -\gamma$ coincidences, and recoil-distance and Doppler-shift lifetime measurements, from which were deduced the energy levels, $\gamma$-ray branching ratios, most probable spin-parity assignments, and level lifetimes. The results of $p-\gamma$ correlation measurements in the ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}(t,p\gamma ){}_{}{}^{60}{}_{}{}^{}\mathrm{Fe}$ reaction are also reported.

NUCLEAR REACTIONS ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}({}_{}{}^{15}{}_{}{}^{}\mathrm{N},xn,yp){}_{}{}^{59,60}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{59-60}{}_{}{}^{}\mathrm{Co}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}({}_{}{}^{18}{}_{}{}^{}\mathrm{O},xn,z\alpha ){}_{}{}^{59,60}{}_{}{}^{}\mathrm{Fe}$. $E=25\mathrm{}-55$ MeV; measured $\sigma (E,E_{\gamma })$ and coin; deduced levels; measured $\sigma (E_{\gamma },\theta )$; deduced $J^{\pi }$ for high-spin levels; measured RDM and DSA; deduced ${\tau }_m$, ${\mathrm{}\left|M\right(M1\mathrm{}\left)\right|}^2$ and ${\mathrm{}\left|M\right(E2\mathrm{}\left)\right|}^2$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}(t,p\gamma ){}_{}{}^{60}{}_{}{}^{}\mathrm{Fe}$; measured $p-\gamma \left(\theta \right)$; deduced $J^{\pi }$. Enriched targets, Ge(Li) detectors.

• Received 13 June 1977

DOI:https://doi.org/10.1103/PhysRevC.16.1027