论文标题
在重离子碰撞中，杜特隆和抗iduteron合并：形成几何形状的能量依赖性
Deuteron and Antideuteron Coalescence in Heavy-Ion Collisions: Energy Dependence of the Formation Geometry
论文作者
论文摘要
我们研究了deuteron和抗ideuteron发射在低至中部至中gy范围$ \ sqrt {s_ {nn}} = 4.6-200 $ gev的碰撞能量依赖性，而与核相比，抗核里的抗核形成速率得到了强烈抑制。在合并图片中，与抗核里的表面发射相比，这可以理解为核的大量发射。通过与关于聚结参数$ b_2 $的实验数据相比，我们能够提取相应的源几何形状。 URQMD传输模型的结果进一步支持了这种解释，并确定了以下图片：在低能量时，核子在总火球体积上冻结了，而在富含核子的火球内部，抗核子被歼灭，并且只能在其表面上冻结。对于更高的能量，这种an灭效应变得无关紧要（由于bary势降低），并且系统的冻结由中膜驱动。因此，随着能量的增加，核子和抗核子冷冻分布变得相似。
We investigate the collision energy dependence of deuteron and antideuteron emission in the RHIC-BES low- to mid-energy range $\sqrt{s_{NN}} = 4.6-200$ GeV where the formation rate of antinuclei compared to nuclei is strongly suppressed. In the coalescence picture, this can be understood as bulk emission for nuclei in contrast to surface emission for antinuclei. By comparison with experimental data on the coalescence parameter $B_2$, we are able to extract the respective source geometries. This interpretation is further supported by results from the UrQMD transport model, and establishes the following picture: At low energies, nucleons freeze out over the total fireball volume, while antinucleons are annihilated inside the nucleon-rich fireball and can only freeze out on its surface. Towards higher energies, this annihilation effect becomes irrelevant (due to the decreasing baryochemical potential) and the system's freeze-out is driven by the mesons. Thus, the nucleon and antinucleon freeze-out distributions become similar with increasing energy.
