Abstract
The α-γ in-plane angular correlations of the reaction 28Si(α, α 1γ) 28Si have been measured at 10, 12, 14 and 18 MeV. Correlations were obtained for c.m. scattering angles from 20° to 170° in 3° steps. Extracted angular-correlation parameters show a strong energy dependence, with a more rapid variation of the correlation pattern as a function of scattering angle with bombarding energy increase. Detailed coupled-channels analyses of the 18 MeV data with coupling of the first three excited states to the ground state of 28Si were performed and a prolate deformation β R = 0.3 was deduced.
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