New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions

J.L. Charvet (1) , R. Dayras (1) , D. Dominique Durand (2) , O. Lopez (2) , D. Cussol (2) , D. Dore (1) , L. Nalpas (1) , A. van Lauwe (2) , C. Volant (1)

1 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 LPCC - Laboratoire de physique corpusculaire de Caen

A previous 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 an evidence for spinodal decomposition. However the signal is weak and rises the question of the estimation of the uncorrelated yield. 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 particular enhancement of the correlation function in any $\Delta Z$ bin.

Mots clés: Nuclear reactions; 129Xe+natSn; E=32; 39; 45; 50 MeV/n; Indra multidetector; Central collisions; Random break-up simulations; Charge correlation analyses

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J.L. Charvet, R. Dayras, D. Dominique Durand, O. Lopez, D. Cussol, et al.. New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions. Nuclear Physics A, 2004, 730, pp.431-447. ⟨10.1016/j.nuclphysa.2003.11.004⟩. ⟨hal-00137572⟩