Résumé du preprint DAPNIA-02-363

DAPNIA-02-363
New approach of fragment charge correlations in Xe+Sn central collisions
J-L.Charvet, R.Dayras, D.Durand, O.Lopez, L.Nalpas, A.Van Lauwe, C.Volant, G.Auger, B.Bouriquet, A.M.Buta, A.Chbihi, J.Colin, D.Cussol, D.Doré, J.D.Frankland, S.Hudan, F.Lavaud, J.F.Lecolley, L.Manduci, J.Normand, P.Pawlowski, E.Rosato, J.C.Steckmeyer, E.Vient, M.Vigilante
A recent analysis of the charge (Z) correlations in the Delta(Z)- plane
for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the
production of equally sized fragments (low Delta(Z)) which was interpreted as 
evidence for spinodal decomposition. However the signal was weak. 
After a critical analysis of its robustness, we propose in this paper 
a new technique to build the uncorrelated
yield in the charge correlation function. The application of this method to 
Xe+Sn central collision data at
32, 39, 45 and 50 MeV/u does not show any significant enhancement at low
Delta(Z) at variance with what it is expected from spinodal decomposition.


 

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