利用同质异位素产额比提取对称能的近似方法

普洁; 乔庆鹏; 魏慧玲; 王闪闪; 马春旺; 张同林

doi:10.11804/NuclPhysRev.29.02.129

利用同质异位素产额比提取对称能的近似方法

Approximate Methods to Extract Symmetry Energy Using Isobaric Yield Ratio Methods

摘要

摘要: 在修改的Fisher模型框架下, 利用同质异位素产额比和结合能方程中对称能系数与温度比率的关联，可以提取对称能系数与温度的比值。利用3种不同的近似方法得到了重离子核反应产生丰中子余核的对称能系数与温度比（a_sym/T），并研究了相关物理量对a_sym/T的影响。结果表明, 库仑能对提取丰中子余核的a_sym/T影响较小，且参考核的选取对a_sym/T的提取也有一定的影响。 In the framework of the modified Fisher model， correlations between the symmetryenergy coefficient in semiclassical mass formula to temperature (a_sym/T) and the isobaric yield ratio in Heavyion collisions are established. a_sym/Tof neutronrich fragments are extracted using these correlations. It is found that the Coulombenergy term has little effect on a_sym/T of fragments， while the reference isobars adopted have great influence on the extracted a sym/T of fragments.

Abstract: In the framework of the modified Fisher model， correlations between the symmetryenergy coefficient in semiclassical mass formula to temperature (a_sym/T) and the isobaric yield ratio in Heavyion collisions are established. a_sym/Tof neutronrich fragments are extracted using these correlations. It is found that the Coulombenergy term has little effect on a_sym/T of fragments， while the reference isobars adopted have great influence on the extracted a sym/T of fragments.

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