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Heavy Ion Collision Studies of the Symmetry Energy at High Temperature and Very Low Density

Heavy Ion Collision Studies of the Symmetry Energy at High Temperature and Very Low Density. J. B. Natowitz CCAST Workshop, Beijing August 2005.

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Heavy Ion Collision Studies of the Symmetry Energy at High Temperature and Very Low Density

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  1. Heavy Ion Collision Studies of the Symmetry Energy at High Temperature and Very Low Density J. B. Natowitz CCAST Workshop, Beijing August 2005

  2. E. Bell1,M. Cinausero2,Y. El Masri 6,D. Fabris3, K. Hagel1, J. Iglio1, A. Keksis1, T. Keutgen6,M. Lunardon3, Z. Majka4,A. Martinez-Davalos,5 A. Menchaca-Rocha5, S. Kowalski1,T. Materna1, J. B. Natowitz1, G. Nebbia3, L. Qin1, G. Prete,2 R. Murthy1, V. Rizzi,3 D. V. Shetty1, S. Soisson1, B. Stein1, G. Souliotis1, P. M. Veselsky1,A. Wieloch1, G. Viesti,3 R. Wada1, J. Wang1, S. Wuenshel1, and S. J. Yennello1 1Texas A&M University, College Station, Texas 2INFN Laboratori Nazionali di Legnaro, Legnaro, Italy 3INFN Dipartimento di Fisica, Padova, Italy 4Jagellonian University, Krakow, Poland 5UNAM, Mexico City, Mexico 6UCL, Louvain-la-Neuve, Belgium The NIMROD Collaboration

  3. Reactions R. Wada et al. Phys. Rev. C 69, 044610(2004) 26, 35, 47A MeV 64Zn + 58Ni 26, 35, 47A MeV 64Zn +92Mo 26, 35, 47A MeV 64Zn +197Au J. Wang et al. ArXiV nucl-ex/0408002, 2005 40A MeV 40Ar + 112Sn 35, 47A MeV 64Zn +92Mo 47A MeV 64Zn + 92Mo 55A MeV 27Al + 124Sn J. Wang et al.Phys. Rev. C 71, 054608 (2005)

  4. Reaction Dynamics and Multifragmentation in Fermi Energy Heavy Ion Reactions - 15,26,35.,47A MeV 64Zn + 58Ni, 92Mo and 197Au R.Wada, et al., Phys. Rev. C 69, 044610(2004) 15 26 35 47 15 26 35 47 64Zn + 92Mo 64Zn + 197Au

  5. Evolution ? Equilibration ? Equation of State?

  6. NIMROD DETECTOR4π Charged Particle Telescopesand 4π Neutron Calorimeter

  7. NIMROD DATA

  8. Source Fits (and Velocity Plots) are Used to Test for Origin of Ejectiles 4He -CsI Detectors Phase 1 Phase 2 “Central Collision”

  9. 26, 35, 47A MeV 64Zn + 58Ni 26, 35, 47A MeV 64Zn +92Mo 26, 35, 47A MeV 64Zn +197Au

  10. CoalescenceModel 1 A-1 – 1 1 _____ = A.Z. Mekjian, Phys. Rev. C 17, 1051 (1978); Phys. Rev. Lett. 38 640 (1977); Phys. Lett B 89,177 ( 1980)

  11. Double Isotope Temperatures Binding Energy Differences 14.3 THHe = 1.59 [ Yd ] [ Y4He ] ln [ Yt ] [ Y3He ] Mass and Spin Factors

  12. Velocity Dependence of Y(t)/Y(3He), Radius and Temperature Evaporation or Disassembly Early EmissionEquilibration ?

  13. Relationship of Average Emission Time with Surface Velocity (AMD Calculation)

  14. Conversion From Velocity to Time

  15. Evidence for Equilibration(A Ghoshal Experiment) J. Wang et al.Phys. Rev. C 71, 054608 (2005)

  16. 26, 35, 47A MeV 64Zn + 58Ni 26, 35, 47A MeV 64Zn +92Mo 26, 35, 47A MeV 64Zn +197Au J. Wang et al. nucl-ex/0408002, 2005

  17. Further Evidence for Equilibration(Thermal and Chemical)

  18. Evolution of Emission Rates Very Similar Results for Au, Mo Targets Nucleons Earliest, Then A=2,3 Clusters, Then Alphas Why Evolve to Such Large Alpha Fractions Late?

  19. Alpha Clustering in Low Density Nuclear Material (Surface, Gas) Relativistic Equation of State of Nuclear Matter for Supernova and Neutron StarH.Shen, H.Toki, K.Oyamatsu, K.Sumiyoshi Nucl.Phys. A637 (1998) 435-450

  20. nucl-th/0507033 • Cluster Formation and The Virial Equation of State • of Low-Density Nuclear MatterC.J. Horowitz, A. Schwenk

  21. nucl-th/0507064 The Virial Equation of State of Low-Density Neutron MatterAuthors:C.J. Horowitz, A. Schwenk

  22. DENSITY DETERMINED FROM ALPHA MASS FRACTION and TEMPERATURE

  23. Tapas Sil, B. K. Agrawal, J. N. De, S. K. Samaddar , Phys.Rev. C63 (2001) 054604 Thomas- Fermi Calculations

  24. T. Sil 186Re T= 5-7 MeV

  25. J.B. Elliott, L.G. Moretto, L. Phair, G.J. Wozniak Phys.Rev. C67 (2003) 024609 • nucl-ex/0206010 • J.B. Natowitz, K. Hagel, • Y. Ma, M. Murray, L. Qin, • S. Shlomo, R. Wada, J. Wang Constructing the phase diagram of finite neutral nuclear matter

  26. Isoscaling Analyses and Symmetry Energy A Comparison of the Yields of Emitted Species for Two Different Sources of Similar Excitation Energy and Temperature but Differing in Their Neutron to Proton Ratios gsym 4 M.B. Tsang, W.A. Friedman, C.K. Gelbke, W.G. Lynch, G. Verde and H.S. Xu, Phys.Rev. C64 (2001) 041603

  27. Isoscaling of LCP Yields From Intermediate Velocity Source 7.75 0.25

  28. Isoscaling of LCP Yields From Intermediate Velocity Source If Only Symmetry Energy Determines Relative Yields  = (4g/T)[(Z/A)2Mo – (Z/A)2Au]  = (4g/T)[(N/A)2Mo – (N/A)2Au] [(Z/A)2Mo – (Z/A)2Au] b/a = [(1- Z/A)2Mo – (1- Z/A)2Au]

  29. Derived Symmetry Energy Coefficient

  30. FINIS

  31. PLO)T GOGNY !!!!

  32. T=4 MeV T = 8 MeV

  33. nucl-ex/0408002 Title: Tracing the Evolution of Temperature in Near Fermi Energy Heavy Ion CollisionsAuthors:J. Wang, R. Wada, T. Keutgen, K. Hagel, Y. G. Ma, M. Murray, L. Qin, A. Botvina, S. Kowalski, T. Materna, J. B. Natowitz, R. Alfarro, J. Cibor, M. Cinausero, Y. El Masri, D. Fabris, E. Fioretto, A. Keksis, M. Lunardon, A. Makeev, N. Marie, E. Martin, Z. Majka, A. Martinez-Davalos, A. Menchaca-Rocha, G. Nebbia, G. Prete, V. Rizzi, A. Ruangma, D. V. Shetty, G. Souliotis, P. Staszel, M. Veselsky, G. Viesti, E. M. Winchester, S. J. Yennello, W. Zipper, A. Ono

  34. A "Little Big Bang" Scenario of MultifragmentationX. Campi, H. Krivine, E. Plagnol, N. Sator Journal-ref: Phys.Rev. C67 (2003) 044610

  35. Title: Reaction Dynamics and Multifragmentation in Fermi Energy Heavy Ion ReactionsAuthors: R. Wada, T. Keutgen, K. Hagel, Y. G. Ma, J. Wang, M. Murray, L. Qin, P. Smith, J. B. Natowitz, R. Alfarro, J. Cibor, M. Cinausero, Y. El Masri, D. Fabris, E. Fioretto, A. Keksis, M. Lunardon, A. Makeev, N. Marie, E. Martin, A. Martinez-Davalos, A. Menchaca-Rocha, G. Nebbia, G. Prete, V. Rizzi, A. Ruangma, D. V. Shetty, G. Souliotis, P. Staszel, M. Veselsky, G. Viesti, E. M. Winchester, S. J. Yennello, Z. Majka, A. OnoPhys.Rev. C69 (2004) 044610

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