Fragment size correlations in finite systems - application to nuclear multifragmentation

Details Fragment size correlations in finite systems - application to nuclear multifragmentation Fragment size correlations in finite systems - application to nuclear multifragmentation

2001-09-27

arxiv.org/abs/nucl-ex/0109019v1

Phys.Rev. C65 (2002) 034604

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevC.65.034604

We present a new method for the calculation of fragment size correlations in a discrete finite system in which correlations explicitly due to the finite extent of the system are suppressed. To this end, we introduce a combinatorial model, which describes the fragmentation of a finite system as a sequence of independent random emissions of fragments. The sequence is accepted when the sum of the sizes is equal to the total size. The parameters of the model, which may be used to calculate all partition probabilities, are the intrinsic probabilities associated with the fragments. Any fragment size correlation function can be built by calculating the ratio between the partition probabilities in the data sample (resulting from an experiment or from a Monte Carlo simulation) and the 'independent emission' model partition probabilities. This technique is applied to charge correlations introduced by Moretto and collaborators. It is shown that the percolation and the nuclear statistical multifragmentaion model ({\sc smm}) are almost independent emission models whereas the nuclear spinodal decomposition model ({\sc bob}) shows strong correlations corresponding to the break-up of the hot dilute nucleus into nearly equal size fragments.

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