Direct versus statistical break-up processes in the 16,18O + 27Al, 28Si reactions at E/A⩽4 MeV☆

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Abstract

In-plane angular correlations (C-α) were measured for the 27Al, 28Si (16,18O, C-α) reactions at E/A=4.0, 3.5 and 3.0 MeV. Relative energies determined for different two-body configurations indicate a competition between incomplete-fusion (ICF) and projectile-break-up (PB) processes. The analysis of the angular correlations supports this picture. Moreover, the projectile-break-up components of the measured correlations, which are mainly determined by phase-space effects, are found to be weakly sensitive to the break-up dynamics. Angular correlations predicted on the basis of a modified elastic break-up model which approximately takes into account both direct and sequential processes, were found to account well for our data.

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Supported in part by CNPq and FAPESP.

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