Abstract
Excitation functions of the reaction 23Na(p, α) 20Ne have been taken at eight angles between θ L = 30°and170° for proton energies E p = 4.0–8.0MeV. The average step size was Δ E = 12keV. An autocorrelation analysis of the strongly fluctuating α 0 yield curves revealed the presence of two coherence widths at a mean excitation energy of E x( 24Mg) = 17.5MeV. The smaller width Γ = 58±4keV was the only one observed in a simultaneously recorded α 1 yield curve and is identified with the fine structure or compound nuclear width. No indications of a J-or T-dependence were found. The larger width of about 150 keV is interpreted in terms of intermediate structure effects. A comparison with autocorrelation analyses of several hundred synthetic excitation functions was performed.
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