标题： 银河宇宙射线初级粒子和次级粒子建模中的差异 显示英文标题

标题： The Discrepancy in Modelling of Galactic Cosmic Ray Primaries and Secondaries

摘要： 鉴于大部分银河宇宙射线（CRs）来自暂现的点源，例如超新星遗迹，因此在地球测量到的CR主要成分的通量取决于本地源的历史。 而次级成分由于附近源的变化很小甚至没有变化，而是应该依赖于CRs的全球分布。 稳态、旋转对称的二维CR传播模型假设银河系中的CR源是弥散的，无法恰当地考虑附近点源的影响。 在本文中，我们通过证明一个二维传播模型不能同样好地描述CR主要成分和次级成分来推断附近源存在的证据。 我们将GALPROP代码的二维版本适配到计算集群环境中，并分别比较CR能谱与主要和次要CR数据的参数研究。 进行参数研究时，单独观察主要和次要CR成分可能会期望得到不同的最佳拟合值，因为二维模型模拟的源历史不太可能与真实的本地源历史一致。 我们发现主要成分和次级成分的最佳拟合参数不同，结果表明该二维模型更适合模拟次级CR。 主要CR建模不足可能是由于可能存在局部CR源。 显示英文摘要

摘要： Given that the bulk of the galactic cosmic rays (CRs) originates from transient point-like sources, such as supernova remnants, the flux of the CR primary component measured at Earth depends on the local source history. Whereas the secondary omponent shows little to no variation due to nearby sources, and instead, should depend on the global distribution of CRs. Steady-state, rotational symmetric models (2D) of CR propagation assume smeared-out CR sources in the Galaxy and cannot properly take into account the influence of nearby point sources. In this paper, we infer evidence of nearby sources by illustrating that a 2D propagation model will not describe CR primaries and secondaries equally well. We adapted the 2D version of the GALPROP code to a compute-cluster environment and perform parameter studies comparing CR spectra with primary and secondary CR data separately. Doing a parameter study, one may expect different best fit values looking at the primary and secondary CR components separately, as it is unlikely that the source history mimicked by the 2D models coincides with the real local source history. We find that the primaries and secondaries are fitted with differing best fit parameters, with the results indicating that the 2D model being more suited to modelling secondary CRs. The insufficient modelling of primary CRs can be contributed to the possible presence of local CR sources.