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arXiv 1407.0432nucl-th
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能量低于π介子产生阈值时重离子碰撞中核对称能和介质中NN截面的影响

Effects of nuclear symmetry energy and in-medium NN cross section in heavy-ion collisions at beam energies below the pion production threshold

Wen-Mei Guo, Gao-Chan Yong, Wei Zuo

摘要:

基于同位旋相关的Boltzmann-Uehling-Uhlenbeck(IBUU 04)输运模型,研究了介质中$NN$弹性散射截面和核对称能对$^{132}Sn+^{124}Sn$反应亚阈π介子产生的影响.研究发现,随着入射光束能量的减小,介质中$NN$弹性散射截面对$π^{-}/π^{+}$比的影响大于对称能量的影响,尽管后者也可能更大。在保持对称能效应的情况下,丰中子反应体系和贫中子反应体系(体系质量数相同)的$^{132}Sn+^{124}Sn$和$^{128}Pm+^{128}Pm$的$π^{-}/π^{+}$的双比值几乎完全抵消了介质中$NN$弹性散射截面的影响。

英文摘要:

Based on the isospin-dependent Boltzmann-Uehling-Uhlenbeck(IBUU04) transport model, we explored effects of in-medium $NN$ elastic scattering cross section and nuclear symmetry energy on the sub-threshold pion production in $^{132}Sn+^{124}Sn$ reaction. We find that with decrease of incident beam energy, effects of in-medium $NN$ elastic scattering cross section on the $π^{-}/π^{+}$ ratio are larger than that of the symmetry energy although the latter may be also larger. While keeping the effect of symmetry energy, the double ratio of $π^{-}/π^{+}$ from neutron-rich and neutron-poor reaction systems (with the same mass number of system) $^{132}Sn+^{124}Sn$ and $^{128}Pm+^{128}Pm$ almost fully cancels out the effects of in-medium $NN$ elastic scattering cross section.

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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