Lifetime measurements in sd-shell nuclei: III. Mean lives of 32P levels

Abstract

The 29Si(α, pγ) 32P reaction was used to study the γ-ray decay and the lifetimes of seven bound states of 32P. A new level was found at E x = 2216.5 ± 1.0 keV. Gamma rays were simultaneously measured in coincidence with protons detected at angles θ p = 110° and −110° or 45° and −45° From these Doppler-shift attenuation measurements the mean lives of the 0.51, 1.15, 1.32, 1.76, 2.18, 2.22 and 2.23 MeV levels were found to be 3000 ± 850, 270 ± 65, 380 ± 80, 510±110, 60±25, 210±50 and 36±20 fs respectively. A previously reported level at E x = 1.51 MeV was not observed The data are compared with recent many-particle shell-model calculations.