Temperatures of Exploding Nuclei

Authors: V. Serfling, C. Schwarz, R. Bassini, M. Begemann-Blaich, S. Fritz, S.J. Gaff, C. Groß, G. Immé, I. Iori, U. Kleinevoß, G.J. Kunde, W.D. Kunze, U. Lynen, V. Maddalena, M. Mahi, T. Möhlenkamp, A. Moroni, W.F.J. Müller, C. Nociforo, B. Ocker, T. Odeh, F. Petruzzelli, J. Pochodzalla, G. Raciti, G. Riccobene, F. P. Romano, A. Saija, M. Schnittker, A. Schüttauf, W. Seidel, C. Sfienti, W. Trautmann, A. Trzcinski, G. Verde, A. Wörner, Hongfei Xi, and B. Zwieglinski
Published: Phys.Rev.Lett 80(1998)3928
Preprint GSI-98-06, January 1998
Preprint nucl-ex/9801006
Abstract: Breakup temperatures in central collisions of 197Au + 197Au at bombarding energies E/A = 50 to 200 MeV were determined with two methods. Isotope temperatures, deduced from double ratios of hydrogen, helium, and lithium isotopic yields, increase monotonically with bombarding energy from 5 MeV to 12 MeV, in qualitative agreement with a scenario of chemical freeze-out after adiabatic expansion. Excited-state temperatures, derived from yield ratios of states in 4He, 5,6Li, and 8Be, are about 5 MeV, independent of the projectile energy, and seem to reflect the internal temperature of fragments at their final separation from the system.

PACS numbers: 25.70.Mn, 25.70.Pq, 25.75.-q

Paper: Postscript 10 pages with 4 embedded figures (500 kb)
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Figures: Fig. 1, 2, 3, 4
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