Excited levels in ${}_{}{}^{44}{}_{}{}^{}\mathrm{K}$ have been populated via the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$($p$,$\alpha n$) reaction. From $\gamma -\gamma$ coincidence measurements, the level and decay schemes have been obtained for ${}_{}{}^{44}{}_{}{}^{}\mathrm{K}$, up to $E_x=1368\mathrm{}$ keV, including several so far unobserved levels and transitions. No lifetime > ∼ 1 ns has been detected for any of these levels. A comparison is done with the neighboring even-$A$ ${}_{}{}^{46}{}_{}{}^{}\mathrm{K}$ isotope and with a simple shell model calculation to give a set of possible $J^{\pi }$ assignments.

NUCLEAR REACTIONS ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$($p$,$\alpha n$)${}_{}{}^{44}{}_{}{}^{}\mathrm{K}$, $E=18-45\mathrm{}$ MeV; measured $E_{\gamma }$, $\sigma (E,E_{\gamma })$, $\gamma -\gamma$ coin, pulsed beam electronic timing; deduced ${}_{}{}^{44}{}_{}{}^{}\mathrm{K}$ levels and transitions, lifetime limits. Enriched target, Ge(Li) coax. and HP Ge.

• Received 1 August 1979

DOI:https://doi.org/10.1103/PhysRevC.21.2135