Idea BUU calculations : 124Sn +124Sn Tlab= 800 MeV/u b = 5 fm

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Presentation transcript:

Idea BUU calculations : 124Sn +124Sn Tlab= 800 MeV/u b = 5 fm L. Shi, P. Danielewicz, R. Lacey, PRC 64 (2001) Observation T.Enqvist et al. NPA658(1999)47 WCI3 Texas 2005

Experiment at the Fragment Separator Inverse kinematics: From ToF:  /∆ ≈ 400 (36m) A/∆A ≈ 400 Once mass and charge are identified (A, Z are integer numbers) the velocity is calculated from B => very precise determination!  /∆ = B/∆B ≈ 2000 WCI3 Texas 2005

Characteristics of the data unambiguous identification & precise longitudinal momenta limited acceptance: ±15mrad, ±1.5% in momentum only one fragment in one reaction measured WCI3 Texas 2005

Information with limited acceptance (op.I) single, predominantly largest residue per reaction unambiguously identified mid-peripheral collisions investigated the largest fragment is correlated with impact parameter 238U+Cu 1AGeV - ALADIN fission fission excluded WCI3 Texas 2005

Information with limited acceptance (op.II) Reconstruction of the velocity distribution: limited momentum acceptance: Several magnetic field settings need to be combined to get complete velocity distribution 136Xe+Pb at 1A GeV 21Ne D. Henzlova PhD thesis (in preparation) WCI3 Texas 2005

Information with limited acceptance (op.III) How to distinguish fragmentation and fission? 238U (1 A GeV) + Pb Fragmentation: heaviest residues fully accepted (A>90) Fission: Only forward and backward component accepted WCI3 Texas 2005

Velocity correction for limited acceptance Influence of limited angular acceptance on mean residue velocities is negligible (A ≥ 60) or small and correctable (25 ≤ A ≤ 60) WCI3 Texas 2005