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arXiv 2301.03556nucl-thhep-phnucl-ex
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高能重离子碰撞中核形状涨落的影响

Impact of nuclear shape fluctuations in high-energy heavy ion collisions

Aman Dimri, Somadutta Bhatta, Jiangyong Jia

AI总结:

本研究探讨了核形状涨落对重离子碰撞初态几何(如偏心率和逆尺寸)的影响,发现四极形变涨落可控地改变其统计矩,三轴性涨落则减小长扁椭球差异,并提出了分离形变均值与方差的方法。

摘要:

原子核的形状通常被解释为具有围绕某个平均轮廓涨落的四极形变。我们研究了核形状涨落对重离子碰撞初态几何形状的影响,特别是与其终态椭圆流和径向流相关的偏心率$\varepsilon_2$和逆尺寸$d_{\perp}$。整体四极形变的涨落以可控方式增强了$\varepsilon_2$和$d_{\perp}$的方差,并改变了它们的偏度和峰度。三轴性的涨落减小了任何可观测量中长椭球与扁椭球形状间的差异,且在大涨落极限下,其值趋近于刚性三轴核碰撞所得结果。本文还讨论了分离四极形变均值与方差的方法。

英文摘要:

The shape of atomic nuclei is often interpreted to possess a quadrupole deformation that fluctuates around some average profile. We investigate the impact of nuclear shape fluctuations on the initial state geometry in heavy ion collisions, particularly its eccentricity $\varepsilon_2$ and inverse size $d_{\perp}$, which can be related to the elliptic and radial flow in the final state. The fluctuation in overall quadrupole deformation enhances the variances and modifies the skewness and kurtosis of the $\varepsilon_2$ and $d_{\perp}$ in a controllable manner. The fluctuation in triaxiality reduces the difference between prolate and oblate shape for any observable, whose values, in the large fluctuation limit, approach those obtained in collisions of rigid triaxial nuclei. The method to disentangle the mean and variance of the quadrupole deformation is discussed.

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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