Abstract
Gamma-ray angular distributions have been measured following the 28Si( alpha ,p gamma )31P reaction using both NaI(Tl) crystals, in coincidence with an annular particle telescope, and GeLi detectors. Lifetimes have been determined using the DSAM and gamma -ray polarizations measured using a 3 GeLi Compton polarimeter. Several new definite spin assignments are given. Many multipole mixing ratios, lifetimes and new branching ratios are reported. An interpretation of the positive parity states is proposed based on the strong coupling and rotation-vibration models. A striking feature in the spectrum of the negative parity states is pointed out which suggests particle-phonon coupling is important. Shell-model calculations based on the MSDI interaction have been extended to include the transition strengths from higher spin positive parity states.
Published Version
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