Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation

Details Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation

2004-09-28

arxiv.org/abs/nucl-ex/0409026v2

Phys.Rev.Lett. 94 (2005) 162701

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.162701

Isotopic effects in the fragmentation of excited target residues following collisions of $^{12}$C on $^{112,124}$Sn at incident energies of 300 and 600 MeV per nucleon were studied with the INDRA 4$\pi$ detector. The measured yield ratios for light particles and fragments with atomic number $Z \leq$ 5 obey the exponential law of isotopic scaling. The deduced scaling parameters decrease strongly with increasing centrality to values smaller than 50% of those obtained for the peripheral event groups. Symmetry term coefficients, deduced from these data within the statistical description of isotopic scaling, are near $\gamma =$ 25 MeV for peripheral and $\gamma <$ 15 MeV for central collisions.

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