Introduction to Heavy Ion Physics
Introduction to Heavy Ion Physics
Introduction to Heavy Ion Physics
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Chemical equilibrium<br />
• The relative particle abundances measured in Pb-Pb collisions are close <strong>to</strong> the<br />
thermodynamical (chemical) equilibrium values (maximum entropy)<br />
corresponding <strong>to</strong> a temperature of ~ 170 MeV (“chemical freeze-out<br />
temperature”). Two parameters: T and μ in the fit.<br />
this would be a natural<br />
outcome of statistical<br />
hadronization of<br />
uncorrelated quarks<br />
[P.Braun-Munzinger, I.Heppe, J.Stachel, Phys. Lett. B465 (1999), 15]<br />
“chemical freeze out”:<br />
the moment when<br />
inelastic interactions<br />
cease<br />
8-th Summer School on Nuclear <strong>Physics</strong>, 3-12/07/12<br />
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