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Responding to Participant Blast: Spectator's Role in VR Experiments

Explore the indications for spectator response to participant blast in VR experiments. Learn about the EOS BUU calculations, inverse kinematics, and precise velocity measurements of projectile fragments. Understand the relationship between spectators and violent participants. Discover how spectator response reflects the properties of the nuclear mean field.

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Responding to Participant Blast: Spectator's Role in VR Experiments

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  1. Indications for the Response of the Spectators to the Participant Blast M. V. Ricciardia, T. Enqvista,[1], J. Pereirab, J. Benlliureb, M. Bernasc, E. Casarejosb, V. Henzla, A. Kelića, J. Taiebc,[2], K.-H. Schmidta aGSI, Planckstr. 1, 64291, Darmstadt, Germany bUniversity of Santiago de Compostela, 15706 Santiago de Compostela, Spain cInstitut de Physique Nucléaire, 91406 Orsay Cedex, France [1] Present address: University of Jyväskylä, 40351 Jyväskylä, Finland [2] Present address: CEA/Saclay DM2S/SERMA/LENR, 91191 Gif/Yvette CEDEX, France

  2. Motivation – how to learn more about the EOS BUU calculations : 124Sn +124Sn Tlab= 800 MeV/u b = 5 fm L. Shi, P. Danielewicz, R. Lacey, PRC 64 (2001) Collective flow: pattern of particles escaping from the hot and dense participants zone depends on EOS Kaon production: kaons contain antistrange quark => almost no absorption in the nuclear medium Spectator response: Is the spectator only a passive witness or rather a victim of violent participants ?

  3. The experiment at the Fragment Separator,GSI-Darmstadt Inverse kinematics: From ToF:  /∆ ≈ 400 (36m) A/∆A ≈ 400 Once mass and charge are identified (A, Z are integer numbers) the velocity is calculated from B => veryprecise evaluation!  /∆ = B/∆B≈ 2000

  4. Velocity distributions of fragmentation residues 238U+Pb @ 1 AGeV T.Enqvist et al. NPA658(1999)47 238U+Ti @ 1 AGeV M.V.Ricciardi et al.PRL 90(2003)212302

  5. Mean velocities of fragmentation residues T.Enqvist et al. NPA658(1999)47 M.V.Ricciardi et al.PRL 90(2003)212302 • Indications for the postulated response of the spectators to the participant blast. In reality, spectator are the participants victims !!! • Precise velocity measurement of projectile fragments is a new tool to investigate the EOS of nuclear matter

  6. “What can we learn from the victims?” Theoretical calculations:(Shi, Danielewicz, Lacey) • Change of the net momentum per nucleon (NM) depends on momentum dependence of the nuclear mean field (MF) • Dependence of NM change on stiffness of EOS very small Spectator response reflects the MD properties of the nuclear MF !!!

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