arXiv 2109.059722021-09hep-phnucl-th

聚并、热模型和多重碎裂：重离子碰撞中轻核产生的能量和体积依赖性

Coalescence, the thermal model and multi-fragmentation: The energy and volume dependence of light nuclei production in heavy ion collisions

Paula Hillmann, Katharina Käfer, Jan Steinheimer, Volodymyr Vovchenko, Marcus Bleicher

备注：: 10 pages, 9 figures, version accepted for publication. J. Phys. G: Nucl. Part. Phys (2022)
DOI：: 10.1088/1361-6471/ac5dfc

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摘要：

我们目前的结果相空间聚结的方法内UrQMD运输和混合模型的一个非常广泛的光束能量从SIS到LHC。聚结模型能够用一组固定的参数定性地描述整个实验数据范围。观察到一些系统的偏差非常低的光束能量的饲料从较重的核和多碎裂的作用变得相关。聚结结果大多非常接近热模型拟合。然而，无论是聚结的方法，以及热拟合都难以同时描述与STAR和ALICE实验测量的triton多重性。在聚结方法中，发现重核在$\mathrm{E_{lab}}> 10 A$ GeV能量下的碰撞中，$tp/d^2$的双比基本上与能量和中心性无关。另一方面，$d/p^2$和$t/p^3$比率与系统体积的明显比例关系在外围碰撞中被打破，其中正则处理和有限尺寸效应变得更加重要。

英文摘要：

We present results of a phase space coalescence approach within the UrQMD transport and -hybrid model for a very wide range of beam energies from SIS to LHC. The coalescence model is able to qualitatively describe the whole range of experimental data with a fixed set of parameters. Some systematic deviations are observed for very low beam energies where the role of feed down from heavier nuclei and multi-fragmentation becomes relevant. The coalescence results are mostly very close to the thermal model fits. However, both the coalescence approach as well as thermal fits are struggling to simultaneously describe the triton multiplicities measured with the STAR and ALICE experiment. The double ratio of $tp/d^2$, in the coalescence approach, is found to be essentially energy and centrality independent for collisions of heavy nuclei at beam energies of $\mathrm{E_{lab}}> 10 A$ GeV. On the other hand the clear scaling of the $d/p^2$ and $t/p^3$ ratios with the systems volume is broken for peripheral collisions, where a canonical treatment and finite size effects become more important.

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