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Characterization of PLF Particle Emission in Peripheral Heavy-ion Collisions

Characterization of PLF Particle Emission in Peripheral Heavy-ion Collisions. Ricardo Yanez Indiana University Cyclotron Facility. PLF Telescope: 2.1º    4.2 º LASSA: 7º    58 º MB/MW: 7º    168 º. Experiment. PLF telescope. D E: segmented 300 m m Si 4 quadrants

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Characterization of PLF Particle Emission in Peripheral Heavy-ion Collisions

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  1. Characterization of PLF Particle Emission in Peripheral Heavy-ion Collisions Ricardo YanezIndiana University Cyclotron Facility

  2. PLF Telescope: 2.1º    4.2º LASSA: 7º    58º MB/MW: 7º    168º Experiment

  3. PLF telescope DE: segmented 300 mm Si 4 quadrants 4 pies, 16 rings for each quadrant E: 2 cm CsI(Tl)

  4. LASSA Element: thickness: #/telescope: DESi1DESi2 CsI 65 mm 500 mm 6 cm 16 1616 4 Dq~0.87 B. Davin et al., Nucl. Inst. Meth. Phys. Res. A 473, 302 (2001).

  5. Event selection • at least 3 charged particles in MB/MW • 1 fragment with 10 < Z  46 in PLF telescope

  6. Galilean invariant velocity maps Laboratory frame

  7. Galilean invariant velocity maps PLF frame

  8. Kinetic energy spectra • Lorentz • solid angle • normalize  d2M /dEdW

  9. Source fit Maxwell-Boltzmann B  Barrier parameter T  Temperature parameter D  Barrier diffuseness parameter J.P.Lestone, Phys. Rev. Lett. 67, 1078 (1991).

  10. Average multiplicity: Emitted charge: Multiplicities

  11. Average mass   Statistical simulation Average charge primary PLF:  SIMON

  12. Fractional yield

  13. Barrier parameter vs. barrier

  14. Slope parameter vs. temperature

  15. Velocity damping

  16. Conclusions • PLF* emission in peripheral collisions is well characterized by isotropic emission in the forward direction. • vPLF* provides a measure of E*. • Malpha and Talpha,slope • The <E*> is ~ 500 MeV, T ~ 7.4 MeV • Tslope,frag ~ 7 MeV > Tslope,alpha ~4-5 MeV:fragments probe the highest excitations/early times.

  17. Collaborators Indiana University Cyclotron Facility B. Davin, R. Alfaro, H. Xu, L. Beaulieu, Y. Larochelle, T. Lefort, S. Hudan, A.L. Caraley, R.T. de Souza NSCL, Michigan State University T.X. Liu, X.D. Liu, W.G. Lynch, R. Shomin, W.P. Tan, M.B. Tsang, A. Vander Molen, A. Wagner, H.F. Xi, C.K. Gelbke, Washington University, St. Louis R.J. Charity, and L.G. Sobotka

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