|Authors:||W. Trautmann et al.|
Proceedings of the
35th International Winter Meeting on Nuclear Physics, Bormio,
Italy, January 26 - February 1, 1997
edited by I. Iori and A. Moroni (Ricerca Scientifica ed Educazione Permanente, Milano, 1997)
We report on new measurements of breakup temperatures for target
spectators from 197Au + 197Au reactions at
1000 MeV per nucleon. The temperatures rise with decreasing impact
parameter from 4 MeV for peripheral to about 10 MeV for the most
central collisions, in good agreement with previous results for
projectile spectators at 600 MeV per nucleon.
The measured temperatures agree quantitatively with the breakup temperatures predicted by the statistical multifragmentation model. For these calculations a relation between the initial excitation energy and mass was derived which gives good simultaneous agreement for the fragment charge correlations.
The energy spectra of light charged particles and the behaviour of the mean kinetic energies of neutrons indicate a substantial component of light particle emission prior to the final breakup stage.
15 pages with 8 embedded figures
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