论文标题
周围重离子碰撞的磁场效应在1 GEV/核子附近
Magnetic field effects in peripheral heavy-ion collisions around 1 GeV/nucleon
论文作者
论文摘要
通过利用依赖同胞依赖的量子量子分子动力学（IQMD）模型，在$^{197} $ au + $^{197} $ au的外围碰撞中研究了对游离核子的磁场影响。借助角分布和两粒子角相关器，发现在11 FM的冲击参数的磁场效应比8 FM的冲击参数更为明显。此外，结果表明，随着外围碰撞数量的增加，质子更容易与磁场凝结。通过自由中子与游离质子的比率作为两粒子相关器$ c_ {2} $，四颗粒相关器$ c_ {4} $和六粒子相关器$ c_ {6} $ c_ {6} $ c_ $ c_ $ c_ $ c_ {6} $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ y $ c_ $ c_ {4} $，进一步研究了磁场效应。结果表明，这些多粒子相关因子可以更清楚地揭示弱磁场效应，其中较大的粒子相关因子表现出清晰的信号。结果突出了一种使用多粒子相关器搜索弱信号的新方法。
Magnetic field effects on free nucleons are studied in peripheral collisions of $^{197}$Au + $^{197}$Au at energies ranging from 600 to 1500 MeV/nucleon by utilizing an isospin-dependent quantum molecular dynamics (IQMD) model. With the help of angular distributions and two-particle angular correlators, the magnetic field effect at an impact parameter of 11 fm is found to be more obvious than at an impact parameter of 8 fm. Moreover, the results suggest that with an increase in the number of peripheral collisions, protons are more easily condensed with the magnetic field. Magnetic field effects are further investigated by the ratio of free neutrons to free protons as functions of a two-particle correlator $C_{2}$, four-particle correlator $C_{4}$ and six-particle correlator $C_{6}$ of angle $ϕ$, rapidity $Y$ and transverse momentum $p_{T}$. The results show that weak magnetic field effects could be revealed more clearly by these multiple-particle correlators, with the larger number of particle correlators demonstrating a clear signal. The results highlight a new method to search for weak signals using multi-particle correlators.
