Correlated Fragment Production inO18-Induced Reactions atEA=84MeV

Correlations between intermediate-mass fragments (IMF's) and heavy fragments were measured for ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$-induced reactions on ${}_{}{}^{\mathrm{nat}}{}_{}{}^{}\mathrm{Ag}$ and ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ at $\frac{E}{A}=84\mathrm{}$ MeV. Correlations of two coincident IMF's show a depletion at small relative velocities $v_{\mathrm{rel}}\le 1$ cm/ns, reflecting the proximity of the two IMF's at the point of creation. However, the time scales for IMF emission derived from this correlation are similar to those of binary-IMF-heavy-recoil coincidences which indicates a sequential nature of multifragment emission in these reactions.