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Directed and elliptic flow in 197Au+197Au at intermediate energies |
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| Authors: | J ?ukasik G Auger M L Begemann-Blaich N Bellaize R Bittiger F Bocage B Borderie R Bougault B Bouriquet J L Charvet A Chbihi R Dayras D Durand J D Frankland E Galichet D Gourio D Guinet S Hudan P Lautesse F Lavaud A Le Fèvre R Legrain O Lopez U Lynen W F J Müller L Nalpas H Orth E Plagnol E Rosato A Saija C Schwarz C Sfienti B Tamain W Trautmann A Trzciński K Turzó E Vient M Vigilante C Volant B Zwiegliński |
| Institution: | 1. GSI, D-64291, Darmstadt, Germany 2. IFJ-PAN, Pl-31342, Kraków, Poland 3. GANIL, CEA et IN2P3-CNRS, F-14076, Caen, France 4. LPC, IN2P3-CNRS/ENSICAEN et Université, F-14050, Caen, France 5. IPN, IN2P3-CNRS et Université, F-91406, Orsay, France 6. DAPNIA/SPhN, CEA/Saclay, F-91191, Gif sur Yvette, France 7. CNAM, F-75141, Paris, France 8. IPN, IN2P3-CNRS et Université, F-69622, Villeurbanne, France 9. INFN, Università Federico II, I-80126, Napoli, Italy 10. University and INFN, 1-95129, Catania, Italy 11. SINS, Pl-00681, Warsaw, Poland |
| Abstract: | Directed and elliptic flow for the 197Au+197Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4π multi-detector. For semi-central collisions, the excitation function of elliptic flow shows a transition from in-plane to out-of-plane emission at around 100 MeV per nucleon. The directed flow changes sign at a bombarding energy between 50 and 60 MeV per nucleon and remains negative at lower energies. Molecular dynamics calculations (CHIMERA) indicate sensitivity of the global squeeze-out transition on the σ NN and demonstrate the importance of angular momentum conservation in transport codes at low energies. |
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