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19 April 2024

» arxiv » nucl-ex/0409026

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Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation
The INDRA ; ALADIN Collaborations: A. Le Fèvre ; G. Auger ; M.L. Begemann-Blaich ; N. Bellaize ; R. Bittiger ; F. Bocage ; B. Borderie ; R. Bougault ; B. Bouriquet ; J.L. Charvet ; A. Chbihi ; R. Dayras ; D. Durand ; J.D. Frankland ; E. Galichet ; D. Gourio ; D. Guinet ; S. Hudan ; G. Immé ; P. Lautesse ; F. Lavaud ; R. Legrain ; O. Lopez ; J. Lukasik ; U. Lynen ; W.F.J. Müller ; L. Nalpas ; H. Orth ; E. Plagnol ; G. Raciti ; E. Rosato ; A. Saija ; C. Schwarz ; W. Seidel ; C. Sfienti ; B. Tamain ; W. Trautmann ; A. Trzci’nski ; K. Turzó ; E. Vient ; M. Vigilante ; C. Volant ; B. Zwiegli’nski ; A.S. Botvina ;
Date:	28 Sep 2004
Journal:	Phys.Rev.Lett. 94 (2005) 162701
Subject:	nucl-ex
Abstract:	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.
Source:	arXiv, nucl-ex/0409026
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