| NUCLEAR PHYSICS |
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The Symmetry Energy from the Neutron-Rich Nucleus Produced in the Intermediate-Energy 40,48Ca and 58,64Ni Projectile Fragmentation |
| MA Chun-Wang**, PU Jie, WANG Shan-Shan, WEI Hui-Ling |
| Department of Physics, Henan Normal University, Xinxiang 453007 |
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| Cite this article: |
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MA Chun-Wang, PU Jie, WANG Shan-Shan et al 2012 Chin. Phys. Lett. 29 062101 |
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Abstract In the framework of a modified Fisher model, using the isobaric yield ratio method, we investigate the fragments produced in the 140 A MeV 40,48Ca+9Be and 58,64Ni+9Be projectile fragmentation reactions. Using different approximation methods, asym/T (the ratio of symmetry?energy coefficient to temperature) of symmetric and neutron-rich fragments are extracted. It is found that asym/T of fragments depend on the reference nucleus and the neutron excess of fragments. The asym/T of the isobar decreases when the neutron?excess of the isobar increases, while for a fragment with the same neutron-excess, asym/T increases as the mass of the fragment increases but saturate when the mass of the fragment becomes larger.
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Received: 09 January 2012
Published: 31 May 2012
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| PACS: |
21.65.Cd
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(Asymmetric matter, neutron matter)
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21.65.Ef
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(Symmetry energy)
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21.65.Mn
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(Equations of state of nuclear matter)
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