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Phys. Rev. C 70, 041604(R) (2004) [5 pages]

Symmetry energy for fragmentation in dynamical nuclear collisions

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Akira Ono1, P. Danielewicz2, W. A. Friedman3, W. G. Lynch2, and M. B. Tsang2
1Department of Physics, Tohoku University, Sendai 980-8578, Japan
2National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

Received 10 August 2004; published 26 October 2004

We extract values for the free symmetry energy as a function of the fragment size (the proton number Z) from antisymmetrized molecular dynamics calculations of calcium collisions. Simple statistical physics describe well the distribution of hot nuclei at breakup, provided the surface symmetry term in the free energy is much smaller at high excitation than in ground state nuclei. This result may reflect the condition of low density and finite temperature when these systems disassemble.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.041604
DOI:
10.1103/PhysRevC.70.041604
PACS:
25.70.Pq
 
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