124Sn + 64Ni (35AMeV) b- impact parameter

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Presentation transcript:

124Sn + 64Ni (35AMeV) b- impact parameter plane PROBABILITY DISTRIBUTION Transversal velocity (vx) reduction with increasing b

Preliminary Filtered F Th. (No Filter included) exp theo E =2700-3100 -180 -150 -120 -90 -60 -30 30 60 90 120 150 180 1.0 1.1 1.2 1.3 1.4 1.5 exp theo AH/AL= 4.6-10 E 2F =2700-3100 124 Sn + 64 Ni 35 MeV/nucl. <V_R> F plane Preliminary Th. (No Filter included)

E.Piasecki et al. IWM(2001) November 28, Catania(I) (preliminary)

asystiff asysoft 124Sn+64Ni 35AMeV r DEPENDENCE OF IMF ISOSPIN COMPOSITION: EOS INFLUENCE asysoft 64Ni 124Sn

ISOSCALING and SYMMETRY ENERGY Isoscaling result: lnR21=Ct+N+Z  Interpretation: ; Consequences: 1.) for 2.) for 3.) always Derivation of ? Yes, if measured From Mirror Isobar Yield Ratios! Observations: - too large N/Z for both n-rich and n-poor systems - too small value for Problems: Evaporation corrections, Equilibrium scenario Heavier IMF’s – liquid phase ?

NECK ISOSCALING lnR21 N  = 0.95 asystiff asysoft  = 0.69 at 35 MeV/n Z=1 Z=2 Z=6 Z=3 Z=7 Z=4 Z=5 lnR21 Z=9 Z=8 N  = 0.95 asystiff asysoft at 35 MeV/n (b=6,7,8fm)  = 0.69

NECK ISOSCALING ln R21 Z asystiff  = -1.07 asysoft  = -0.68 at 35 MeV/n (b=6,7,8fm)  = -0.68 asysoft “GRAND CANONICAL” NECK?

not very sensitive to Esym ? Dynamical Isoscaling primary 50 AMeV (central coll.) Z=1 Z=7 final not very sensitive to Esym ? 124Sn Carbon isotopes (primary) M.J. van Goethem, G. Verde,M. Colonna MSU data (2001-02) nucl-ex/0210004 Asy-stiff Asy-soft A

ISOSPIN IN REACTIONS: EOS – SENSITIVE OBSERVABLES Competition of dissipative reaction mechanisms N/Z of fast particle emission (n,p) correlation functions Isospin fractionation (isoscaling) * Fragment multiplicities * Isospin content of neck fragments * Fast fission multiplicities Isospin diffusion (charge equilibration) n – p collective flows light isobar flows * -/+ yields * Deconfinement precursors n-radii, n-star cooling, hybrid stars * Asy-stiff indications but low asymmetries so far