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Isotopic Dependence of the Caloric Curve

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arxiv 0907.1196 v1 pith:5XYGORAR submitted 2009-07-07 nucl-ex

The ALADIN2000 Collaboration: W. Trautmann , P. Adrich , T. Aumann , C.O. Bacri , T. Barczyk , R. Bassini , S. Bianchin , C. Boiano
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A.S. Botvina A. Boudard J. Brzychczyk A. Chbihi J. Cibor B. Czech M. De Napoli J.-E. Ducret H. Emling J.D. Frankland M. Hellstroem D. Henzlova G. Imme I. Iori H. Johansson K. Kezzar A. Lafriakh A. Le Fevre E. Le Gentil Y. Leifels J. Luehning J. Lukasik W.G. Lynch U. Lynen Z. Majka M. Mocko W.F.J. Mueller A. Mykulyak H. Orth A.N. Otte R. Palit P. Pawlowski A. Pullia G. Raciti E. Rapisarda H. Sann C. Schwarz C. Sfienti H. Simon K. Suemmerer M.B. Tsang G. Verde C. Volant M. Wallace H. Weick J. Wiechula A. Wieloch B. Zwieglinski
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keywords isotopictemperaturesbeenchemicalaladinbeamsbreakupcaloric
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Isotopic effects in projectile fragmentation at relativistic energies have been studied with the ALADIN forward spectrometer at SIS. Stable and radioactive Sn and La beams with an incident energy of 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z ratio of the produced spectator sources, consistent with predictions for expanded systems. Consequences for the proposed interpretation of chemical breakup temperatures as representing the limiting temperatures predicted by microscopic models are discussed.

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