Thermal and Chemical Freeze-out in Spectator Fragmentation
Nuclear Experiment
2008-11-26 v2
Abstract
Isotope temperatures from double ratios of hydrogen, helium, lithium, beryllium, and carbon isotopic yields, and excited-state temperatures from yield ratios of particle-unstable resonances in 4He, 5Li, and 8Be, were determined for spectator fragmentation, following collisions of 197Au with targets ranging from C to Au at incident energies of 600 and 1000 MeV per nucleon. A deviation of the isotopic from the excited-state temperatures is observed which coincides with the transition from residue formation to multi-fragment production, suggesting a chemical freeze-out prior to thermal freeze-out in bulk disintegrations.
Keywords
Cite
@article{arxiv.0708.4115,
title = {Thermal and Chemical Freeze-out in Spectator Fragmentation},
author = {W. Trautmann and R. Bassini and M. Begemann-Blaich and A. Ferrero and S. Fritz and S. J. Gaff-Ejakov and C. Gross and G. Imme and I. Iori and U. Kleinevoss},
journal= {arXiv preprint arXiv:0708.4115},
year = {2008}
}
Comments
14 pages, 10 figures, submitted to Phys. Rev. C, small changes as suggested by the editors and referees