ASY-EOS Past and future: PR Milano, 28/04/14. Fuchs and Wolter, EPJA 30 (2006) EOS of symmetric...
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- Slide 1
- ASY-EOS Past and future: PR Milano, 28/04/14
- Slide 2
- Fuchs and Wolter, EPJA 30 (2006) EOS of symmetric nuclear and
neutron matter from Ab initio calculations (red) and
phenomenological approaches E bind (MeV) E sym E Sym (MeV) Symmetry
Energy
- Slide 3
- Qingfeng Li, J. Phys. G31 1359-1374 (2005) P.Russotto et al.,
Phys. Lett. B 697 (2011) UrQMD :Au+Au @ 400 AMeV 5.5
- LAND+VETO TOFWALL Krakow array Beam Line Ball Target Chimera
Start detector Shadow bars Ball: 4 rings CsI(Tl), >60.
Discriminate real target vs. air interactions at backward angles.
Multiplicity measurements. Shadow bar: evaluation of background
neutrons in LAND LAND: Large Area Neutron Detector. Plastic
scintillators sandwiched with Fe 2x2x1 m 3 plus plastic veto wall.
New Taquila front-end electronics. Neutrons and Hydrogen detection.
Flow measurements TOFWALL: 96 plastic bars Tof, Energy X-Y
position. Trigger, impact parameter and reaction plane
determination Kracow array: 35 (5x7) triple telescopes (Si-CsI-
CsI) placed at 21
- Reaction plane orientation Au+Au @ 400 AMeV g40_23092013 for
Yc.m.>0.1 J-Y Ollitrault arXiv:nucl-ex/9711003v2 b selection
(deg) b>7.5 fm1.010.3634 3
- N/Z of high density regions sensitive to E sym () High > 0 :
asy-stiff more repulsive on neutrons stiffness B.A. Li et al.,
PRC71 (2005) Which densities can be explored in the early stage of
the reaction ? Bao-An Li, NPA 708 (2002) High density symmetry
energy in relativistic heavy ion collisions
- Slide 31
- IBUU04 ImIQMD E sym at high density: - / + ratio Z. Xiao et
al., PRL 102 (09) Z.Q. Feng, PLB 683 (2010) Ferini, at al., NPA 762
(2005) NL NL NL W.J. Xie, at al., PLB 718 (2013) RMF ImIBL
- Slide 32
- 1230 E sym (MeV) 1 1 2 (measured by FOPI, for different systems
and energies, as compared to different models) Results model
dependent Density dependence of symmetry energy unambiguously soft
or hard BUT symmetry energy n/p ratio, number of nn, np, pp
collisions medium effective masses (N ), cross sections thresholds
Interpretation of pion data not straight forward Kaons: more
sensitive probes? Higher thresholds Weakly interacting in medium
Freeze-out already at 20 fm/c See: Z. Xiao et al., PRL 102 (09)
IBUU04 Z.Q. Feng, PLB 683 (2010) ImIQMD W.J. Xie, at al., PLB 718
(2013) ImIBL G. Ferini, at al., NPA 762 (2005) RMF E sym at high
density: - / + ratio
- Slide 33
- UrQMD: momentum dep. of isoscalar field momentum dep. of NNECS
momentum independent power-law parameterization of the symmetry
energy Tbingen-QMD: density dep. of NNECS asymmetry dep. of NNECS
soft vs. hard EoS width of wave packets momentum dependent (Gogny
inspired) parameterization of the symmetry energy M.D. Cozma, PLB
700, 139 (2011); arXiv:1102.2728 Results with Tbingen QMD Au+Au 400
A MeV b< 7.5 fm stiffnes M.D. Cozma et al., Towards a
model-independent constraint of the high-density dependence of the
symmetry energy, arXiv:1305.5417arXiv:1305.5417 [nucl-th] PRC88
044912 (2013) x =-1.351.25
- Slide 34
- Why 132 Sn?
- Slide 35
- Slide 36
- Slide 37
- Au+Au @ 400 AMeV b< 7.5 fm L=769