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Abstract
The correlation function of two intermediate-mass fragments (IMF) is derived from first principles. Care is taken of the final-state Coulomb interaction of the observed IMF with the rest source and of the initial correlations in the source at the moment of emission. These correlations are of various origins. Due to basic conservation laws of mass, charge, momentum and energy the emission probabilities of IMF are strongly correlated. Secondly, near to the onset of multifragmentation dynamical correlations in the emitting source are of crucial importance. These IMF-IMF correlation functions carry the main information on the transition from evaporation or very hot asymetric fission to multifragmentation. All these features are ignored in the usual analysis starting with the Koonin-Pratt formula. The information on the decaying source contained in the IMF-IMF correlation function is analyzed within the Berlin multifragmentation model. The rise seen at low excitation energies signalizes very asymmetric hot fission. It disappears within the region of multifragmentation when the largest fragment is also an IMF.
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