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Phys. Rev. C 70, 011601(R) (2004) [4 pages]

Symmetry energy and the isospin dependent equation of state

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D. V. Shetty, S. J. Yennello, A. S. Botvina*, G. A. Souliotis, M. Jandel, E. Bell, A. Keksis, S. Soisson, B. Stein, and J. Iglio
Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA

Received 7 May 2004; published 6 July 2004

The isoscaling parameter α, from the fragments produced in the multifragmentation of 58Ni+58Ni, 58Fe+58Ni and 58Fe+58Fe reactions at 30, 40 and 47 MeV∕nucleon, was compared with that predicted by the antisymmetrized molecular dynamic calculation based on two different nucleon-nucleon effective forces, namely the Gogny and Gogny-AS interaction. The results show that the data agree better with the choice of Gogny-AS effective interaction, resulting in a symmetry energy of ∼18–20 MeV. The observed value indicates that the fragments are formed at a reduced density of ∼0.08 fm−3.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.011601
DOI:
10.1103/PhysRevC.70.011601
PACS:
25.70.Pq, 25.70.Mn, 26.50.+x

*On leave from Institute for Nuclear Research, 117312 Moscow, Russia.

 
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