Lifetimes, spins and decay modes of levels below 5.3 MeV in ³³S

The reaction ³⁰Si( alpha , n)³³S was used to populate levels in ³³S at alpha particle energies between 7.00 and 10.00 MeV. Gamma rays in ³³S were observed in a Ge(Li)-NaI(Tl) escape-suppressed and pair-escape spectrometer. The Doppler shift attenuation method was used to measure the mean lifetimes of 20 levels and to set limits on the lifetimes of 3 levels in ³³S. The analysis of angular distributions of gamma rays together with the measured lifetimes and branching ratios gave gamma ray multipole mixing ratios and spin and parity assignments of ⁷/₂⁺, (⁵/₂, ⁹/₂)⁺, (³/₂⁺, ⁵/₂) and (⁷/₂, ¹¹/₂)^- for the levels at 2971, 4050, 4145 and 4868 keV respectively.