Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Physik mit schweren Ionen

HK 11.5: Vortrag

Freitag, 4. März 2005, 18:15–18:30, TU MA042

Spectator response to the participant blast in the reaction 197Au+197Au at 1A GeV - results of the first dedicated experiment — •Vladimir Henzl — GSI, Planckstr. 1, 64291, Darmstadt, Germany

The response of the spectators to the participants’ blast can result in a gain of the residue longitudinal momenta such that the mean spectator-like residue velocities can exceed the velocity of the original projectile. Such re-acceleration effect is predicted to exhibit sensitivity to the momentum-dependent properties of the nuclear mean field and at the same time stay almost unaffected by the stiffness of the nuclear matter. This indicates that the re-acceleration of projectile spectators represents a new tool for investigating the momentum dependent properties of nuclear matter and its impact on the nuclear EOS.

This contribution presents the results of the first experiment entirely dedicated to the precise measurements of the momenta of the projectile fragments in the reaction 197Au+197Au at 1 A GeV performed with the high-resolution magnetic spectrometer FRS at GSI-Darmstadt. The experimental results are confronted with BUU calculations for different nuclear equations of state and mean-field potentials.