Abstract
Nuclear properties of the excited states of $^{32}\mathrm{Si}$ were measured using the $^{30}\mathrm{Si}(t,p\ensuremath{\gamma})$ reaction at bombarding energies of ${E}_{t}=2.7 \mathrm{and} 2.8$ MeV. Angular correlations of $\ensuremath{\gamma}$ rays were obtained using a spectrometer consisting of five NaI(Tl) counters in time coincidence with an annular particle detector positioned near 180\ifmmode^\circ\else\textdegree\fi{}. Unique spin assignments for some of the excited states were obtained in addition to multipole-mixing-ratio and branching-ratio information. Nuclear lifetimes were measured using the Doppler-shift attenuation method. Some of the measured excitation energies, spins, and mean lifetimes [${E}_{x}$ (keV), $J$, and $\ensuremath{\tau}$ (psec), respectively] are as follows: 1942.5 \ifmmode\pm\else\textpm\fi{} 2.0, 2, 0.92 \ifmmode\pm\else\textpm\fi{} 0.30; 4985 \ifmmode\pm\else\textpm\fi{} 4, \ensuremath{\le}2, \ensuremath{\le}0.44; 5290 \ifmmode\pm\else\textpm\fi{} 3, 3, 0.27 \ifmmode\pm\else\textpm\fi{} 0.10; 5413 \ifmmode\pm\else\textpm\fi{} 3, 1, \ensuremath{\le}0.074; 5956 \ifmmode\pm\else\textpm\fi{} 3, 2, \ensuremath{\le}0.08; 6196 \ifmmode\pm\else\textpm\fi{} 5, 1, \ensuremath{\le}0.055; 6385 \ifmmode\pm\else\textpm\fi{} 5, 2, \ensuremath{\le}0.072. A hitherto unreported state at 4234 \ifmmode\pm\else\textpm\fi{} 4 keV was found to have a spin $J=2$ and mean lifetime of $\ensuremath{\tau}=0.38\ifmmode\pm\else\textpm\fi{}0.12$ psec. The reported spectroscopic data are compared to the predictions of recent shell-model calculations.
Published Version
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