Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 17: Postersitzung / Physik mit schweren Ionen

HK 17.3: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 69

Fragment Kinetic Energies and Modes of Fragment Formation — •W. Trautmann — GSI Darmstadt, Planckstr. 1, D-64291 Darmstadt, Germany

Kinetic energies of light fragments (A ≤ 10) from the decay of target spectators in ¹⁹⁷Au + ¹⁹⁷Au collisions at 1000 MeV per nucleon have been measured with high-resolution telescopes at backward angles. Except for protons and apart from the observed evaporation components, the kinetic-energy spectra exhibit slope temperatures of about 17 MeV, independent of the particle species. With the assumption that the slope temperatures reflect the intrinsic Fermi motion within the spectator system they are sensitive to the equilibrium density prior to breakup and thus to the mechanism of fragment formation.