Emission temperatures and freeze out densities from light particle correlation functions in Au+Au collisions at 1 A GeV

Abstract

A study of emission temperatures extracted from excited state populations and of freeze out radii from light particle intensity interferometry is presented. Three high resolution dE-E-Hodoscopes with a total of 216 detectors are combined with the ALADiN setup in order to study Au+Au collisions at 1 A GeV. In contrast to measurements with the isotope thermometer the extracted apparent temperatures do not vary with impact parameter thus with excitation energy. From the extracted radii a freeze out density was determined which decreases from $0.2ρ_0$ for the most peripheral to less than $0.1ρ_0$ for the most central collisions. A density--dependent feeding correction is applied to the different temperature measurements.

13 pages, TeX with 9 included figures; To appear in the proceedings of the 35th International Winter Meeting on Nuclear Physics, Bormio, Italy, January 26 - February 1, 1997; also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html