Levels in ${}_{}{}^{42}{}_{}{}^{}\mathrm{Ca}$ excited by the ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},2\mathrm{}p)$ reaction have been investigated with $E_{{}_{}{}^{16}{}_{}{}^{}\mathrm{O}}=36\mathrm{}-42$ MeV. $\gamma$-ray angular distributions and $\gamma \gamma$ angular correlations relative to the beam direction have been determined. Level energies, decay modes, spins, parities, and $\gamma$-ray radiative admixtures were extracted. Level energies in keV and preferred $J^{\pi }\text{'}\mathrm{s}$ are: 4099.9 ($5^{-}$), 5491.4 ($5^{+}$), 5744.1 ($5^{-}$), 6144.5 ($6^{+}$), 6408.8 ($7^{+}$), 6553.9 ($7^{-}$), 7368.7 ($6^{-}$ or $8^{-}$), and 8297.9 ($J=J_{7369}\pm 1$). These spin-parity assignments differ from those reported recently by Warburton, Kolata, and Olness.

NUCLEAR REACTIONS ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},2\mathrm{}p)$ $E=36\mathrm{}-42$ MeV; measured $E_{\gamma }$, $I_{\gamma }$, $\gamma \left(\theta \right)$, $\gamma \gamma \left(\theta \right)$. ${}_{}{}^{42}{}_{}{}^{}\mathrm{Ca}$ deduced levels, $J$, $\pi$, $\delta$, $\gamma$ branching, transition probabilities.

• Received 20 November 1975

DOI:https://doi.org/10.1103/PhysRevC.13.1922