Determination of the freeze-out temperature by the isospin thermometer

Details Determination of the freeze-out temperature by the isospin thermometer Determination of the freeze-out temperature by the isospin thermometer

2002-09-02

arxiv.org/abs/nucl-ex/0209001v2

Phys.Atom.Nucl. 66 (2003) 1471-1477; Yad.Fiz. 66 (2003) 1517-1522

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 6 figures, corrected some misprints in the abstract, to be published in "Yadernaya Fizika" as a proceeding of the "VI

Scientific paper

10.1134/1.1601752

The high-resolution spectrometer FRS at GSI Darmstadt provides the full isotopic and kinematical identification of fragmentation residues in relativistic heavy-ion collisions. Recent measurements of the isotopic distribution of heavy projectile fragments led to a very surprising new physical finding: the residue production does not lose the memory of the N/Z of the projectile ending up in a universal de-excitation corridor; an ordering of the residues in relation to the neutron excess of the projectile has been observed. These unexpected features can be interpreted as a new manifestation of multifragmentation. We have found that at the last stage of the reaction the temperature of the big clusters subjected to evaporation is limited to a universal value. The thermometer to measure this limiting temperature is the neutron excess of the residues.

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