The $\gamma$-ray decays of high-spin states in ${}_{}{}^{35,36,37}{}_{}{}^{}\mathrm{Cl}$ and ${}_{}{}^{37}{}_{}{}^{}\mathrm{Ar}$ were studied via heavy-ion-induced reactions involving ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ bombardment of targets of ${}_{}{}^{24,26}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$. Decay schemes and spin-parity assignments were deduced from $\gamma \gamma$-coincidence measurements, $\gamma$-ray angular distribution and linear polarization measurements, and recoil-distance lifetime measurements. The observed levels are compared to predictions of the weak-coupling model. It is concluded that all the observed high-spin states can be assigned to configurations based on one- or two-nucleon excitations from the ($2s,1\mathrm{}d$) shell into the ($1f,1p$) shell, and that not all the energetically available yrast levels of these configurations have, as yet, been found.

NUCLEAR REACTIONS (HI, $\mathrm{xn}$, $\mathrm{yp}$, $z\alpha$) studies for ${}_{}{}^{35,36,37}{}_{}{}^{}\mathrm{Cl}$ and ${}_{}{}^{37}{}_{}{}^{}\mathrm{Ar}$, with ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ projectiles, ${}_{}{}^{24,26}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ targets, $E=20-60\mathrm{}$ MeV; measured $\gamma \gamma$ coin.; deduced levels; measured $\sigma (E_{\gamma },\theta )$ and $P_{\gamma }$; deduced $J^{\pi }$ for high-spin levels; measured recoil distance; deduced $\tau$. Natural and isotopically enriched targets, Ge(Li) detectors. Compared results to weak-coupling model predictions.

• Received 4 May 1976

DOI:https://doi.org/10.1103/PhysRevC.14.996