Residue Coulomb Interaction Among Isobars and Its Influence in Symmetry Energy of Neutron-Rich Fragment |
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| Authors: | MA Chun-Wang WANG Shan-Shan ZHANG Yan-Li ZHAO Yi-Long WEI Hui-Ling |
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| Affiliation: | 1. Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China;2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;3. College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China |
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| Abstract: | ![]()
The residue Coulomb interaction (RCI), which affects the result of symmetry-energy coefficient of neutron-rich nucleus in isobaric yield ratio (IYR) method, is difficult to be determined. Four RCI approximations are investigated: (i) The M1-RCI adopting the ac/T (the ratio of Coulomb energy coefficient to temperature) determined from the IYR of mirror-nucleus fragments; (ii) The M2-RCI by fitting the difference between IYRs; (iii) The M3-RCI adopting the standard Coulomb energy at a temperature T=2 MeV; and (iv) Neglecting the RCI among isobars. The M1-, M2- and M3-RCI are no larger than 0.4. In particular, the M2-RCI is very close to zero. The effects of RCI in asym/T of fragment are also studied. The M1- and M4-asym/T are found to be the lower and upper limitations of asym/T, respectively. The M2-asym/T overlaps the M4-asym/T, which indicates that the M2-RCI is negligible in the IYR method, and the RCI among the three isobars can be neglected. The relative consistent low values of M3-asym/T (7.5±2.5) are found in very neutron-rich isobars. |
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| Keywords: | isobaric yield ratio residue Coulomb interaction symmetry energy neutron-rich nucleus |
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