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arXiv 1002.0319nucl-ex
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重离子碰撞多重碎裂区的等标度和对称能

Isocaling and the Symmetry Energy in the Multifragmentation Regime of Heavy Ion Collisions

Z. Chen, S. Kowalski, M. Huang, R. Wada, T. Keutgen, K. Hagel, J. Wang, L. Qin, J. B. Natowitz, T. Materna, P. K. Sahu, A. Bonasera

摘要:

在费米能重离子碰撞中,利用等标度参数和同位素分布的方差,从实验上提取了对称能系数与温度之比$a_sym/T$与碎片原子序数的函数关系.提取的值进行了比较与反对称分子动力学(AMD)模型采用统计衰变代码占激发的初级片段的去激发的计算结果。实验值与计算值吻合良好,但与表征初级AMD片段产率的那些值有显着差异。

英文摘要:

The ratio of the symmetry energy coefficient to temperature, $a_sym/T$, in Fermi energy heavy ion collisions, has been experimentally extracted as a function of the fragment atomic number using isoscaling parameters and the variance of the isotope distributions. The extracted values have been compared to the results of calculations made with an Antisymmetrized Molecular Dynamics (AMD) model employing a statistical decay code to account for deexcitation of excited primary fragments. The experimental values are in good agreement with the values calculated but are significantly different from those characterizing the yields of the primary AMD fragments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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