Gamma-Ray Decay of the Low-Lying Levels ofCl34

Abstract

The excitation energies and $\ensuremath{\gamma}$-ray decay modes of the low-lying states of ${\mathrm{Cl}}^{34}$ have been studied using the ${\mathrm{S}}^{32}({\mathrm{He}}^{3},p\ensuremath{\gamma}){\mathrm{Cl}}^{34}$ reaction. Some lifetime limits were obtained by the Dopplershift-attenuation method. The lifetimes of the $({J}^{\ensuremath{\pi}},T)=({1}^{+},0)$ levels at 461 and 666 keV, and the (${2}^{+}$, 0) level at 1230 keV were measured to be 7.1 \ifmmode\pm\else\textpm\fi{} 0.7, 12.8 \ifmmode\pm\else\textpm\fi{} 1.0, and 19.4 \ifmmode\pm\else\textpm\fi{} 1.4 psec, respectively, using the recoil-distance (plunger) technique with the ${\mathrm{P}}^{31}(\ensuremath{\alpha},n\ensuremath{\gamma}){\mathrm{Cl}}^{34}$ reaction. The transition strengths from these three levels are discussed qualitatively in terms of calculations involving simple configurations, and are compared with recent detailed shell-model calculations.