J. B. Natowitz CCAST Workshop, Beijing August 2005.

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Presentation transcript:

J. B. Natowitz CCAST Workshop, Beijing August 2005

E. Bell 1, M. Cinausero 2, Y. El Masri 6,D. Fabris 3, K. Hagel 1, J. Iglio 1, A. Keksis 1, T. Keutgen 6, M. Lunardon 3, Z. Majka 4, A. Martinez-Davalos, 5 A. Menchaca-Rocha 5, S. Kowalski 1,T. Materna 1, J. B. Natowitz 1, G. Nebbia 3, L. Qin 1, G. Prete, 2 R. Murthy 1, V. Rizzi, 3 D. V. Shetty 1, S. Soisson 1, B. Stein 1, G. Souliotis 1, P. M. Veselsky 1, A. Wieloch 1, G. Viesti, 3 R. Wada 1, J. Wang 1, S. Wuenshel 1, and S. J. Yennello 1 1 Texas A&M University, College Station, Texas 2 INFN Laboratori Nazionali di Legnaro, Legnaro, Italy 3 INFN Dipartimento di Fisica, Padova, Italy 4 Jagellonian University, Krakow, Poland 5 UNAM, Mexico City, Mexico 6 UCL, Louvain-la-Neuve, Belgium

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

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

Evolution ? Equilibration ? Equation of State ?

NIMROD DETECTOR 4 π Charged Particle Telescopes and 4 π Neutron Calorimeter

NIMROD DATA

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

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

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

Double Isotope Temperatures T HHe = [ Y d ] [ Y 4 He ] 1.59 [ Y d ] [ Y 4 He ] [ Y t ] [ Y 3 He ] [ Y t ] [ Y 3 He ] ln Binding Energy Differences Mass and Spin Factors

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

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

Conversion From Velocity to Time

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

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

Further Evidence for Equilibration (Thermal and Chemical)

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?

Alpha Clustering in Low Density Nuclear Material (Surface, Gas) Relativistic Equation of State of Nuclear Matter for Supernova and Neutron Star H.Shen, H.Toki, K.Oyamatsu, K.Sumiyoshi Nucl.Phys. A637 (1998) H.ShenH.TokiK.OyamatsuK.Sumiyoshi

nucl-th/ Cluster Formation and The Virial Equation of State of Low-Density Nuclear Matter C.J. Horowitz, A. SchwenkC.J. HorowitzA. Schwenk

nucl-th/ The Virial Equation of State of Low-Density Neutron Matter Authors: C.J. Horowitz, A. SchwenkC.J. HorowitzA. Schwenk

DENSITY DETERMINED FROM ALPHA MASS FRACTION and TEMPERATURE

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

T. Sil 186Re T= 5-7 MeV

J.B. ElliottJ.B. Elliott, L.G. Moretto, L. Phair, G.J. Wozniak Phys.Rev. C67 (2003) L.G. MorettoL. PhairG.J. Wozniak Constructing the phase diagram of finite neutral nuclear matter nucl-ex/ J.B. Natowitz, K. Hagel,J.B. NatowitzK. Hagel Y. MaY. Ma, M. Murray, L. Qin,M. MurrayL. Qin S. ShlomoS. Shlomo, R. Wada, J. WangR. WadaJ. Wang

Isoscaling Analyses and Symmetry Energy M.B. TsangM.B. Tsang, W.A. Friedman, C.K. Gelbke, W.G. Lynch,W.A. FriedmanC.K. GelbkeW.G. Lynch G. VerdeG. Verde and H.S. Xu, Phys.Rev. C64 (2001) H.S. Xu 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  sym 4

Isoscaling of LCP Yields From Intermediate Velocity Source

Isoscaling of LCP Yields From Intermediate Velocity Source  = (4  /T)[(Z/A) 2 Mo – (Z/A) 2 Au ]  = (4  /T)[(N/A) 2 Mo – (N/A) 2 Au ] If Only Symmetry Energy Determines Relative Yields  = [(Z/A) 2 Mo – (Z/A) 2 Au ] [(1- Z/A) 2 Mo – (1- Z/A) 2 Au ]

Derived Symmetry Energy Coefficient

FINIS

PLO)T GOGNY !!!!

T=4 MeV T = 8 MeV

nucl-ex/ Title: Tracing the Evolution of Temperature in Near Fermi Energy Heavy Ion Collisions Authors: 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. OnoJ. WangR. WadaT. KeutgenK. HagelY. G. MaM. MurrayL. QinA. BotvinaS. KowalskiT. MaternaJ. B. NatowitzR. AlfarroJ. CiborM. CinauseroY. El MasriD. FabrisE. FiorettoA. KeksisM. LunardonA. MakeevN. MarieE. MartinZ. MajkaA. Martinez-DavalosA. Menchaca- RochaG. NebbiaG. PreteV. RizziA. RuangmaD. V. ShettyG. SouliotisP. StaszelM. VeselskyG. ViestiE. M. WinchesterS. J. YennelloW. ZipperA. Ono

A "Little Big Bang" Scenario of Multifragmentation X. Campi, H. Krivine, E. Plagnol, N. Sator Journal-ref: Phys.Rev. C67 (2003) X. CampiH. KrivineE. PlagnolN. Sator

Title: Reaction Dynamics and Multifragmentation in Fermi Energy Heavy Ion Reactions Authors: 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. Ono Phys.Rev. C69 (2004) R. WadaT. KeutgenK. HagelY. G. Ma J. WangM. MurrayL. QinP. SmithJ. B. NatowitzR. AlfarroJ. CiborM. CinauseroY. El MasriD. FabrisE. FiorettoA. KeksisM. LunardonA. MakeevN. MarieE. MartinA. Martinez-DavalosA. Menchaca-RochaG. NebbiaG. PreteV. RizziA. RuangmaD. V. ShettyG. SouliotisP. StaszelM. VeselskyG. ViestiE. M. WinchesterS. J. YennelloZ. Majka A. Ono