Abstract
A search for high-spin states in28Si has been performed byn−y coincidence measurements in the25Mg(α,nγy) reaction atEα=14 and 15.5 MeV. Spin-parity assignments of the observed levels were obtained fromn−γ angular correlation and lifetime measurements atEα=14.5 MeV. Theγ-decay of the 9,164 keV level was investigated separately with the27Al(p, γ) reaction at theEp=2,160 and 2,312 keV resonances. Rotational bands withKπ=3− (comprising levels atEx=6,879, 8,413, 10,188 and 12,204 keV),Kπ =5− (comprising levels atEx=9,702, 11,577 and 13,741 keV) andKπ=0+ (comprising levels atEx=6,691, 7,381, 9,164 and 11,509 keV) were observed. The finding of the latter band supports the idea of coexisting oblate and prolate shapes in28Si. A level at 14,643 keV excitation energy has the properties of theIπ=8+ member of the ground state band. There are additional positive-parity high-spin states which do not fit into rotational bands. All types of positive-parity states are well accounted for by shell model calculations.
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