关于若干能量守恒问题的探讨

本文以德国卡尔斯鲁尔物理课程(KPK)所提出的能量概念为线索,简要地探讨了宇宙和天体、一般物理化学生物过程以及化学反应过程中的某些能量守恒问题。作者希望通过简单对比,凸显KPK方法的独特优点,从而有助于学习者拓宽视野、加深认识。     

Centrality dependences of the pseudorapidity distributions of charged particles in Au+Au collisions at RHIC energies

By employing the Glauber model, we give the centrality dependences of the numbers of participants and binary nucleon-nucleon collisions in nucleus-nucleus collisions. By taking into account the energy loss of the participants in their multiple collisions, we then present the pseudorapidity distributions of charged particles in nucleus-nucleus collisions as a function of beam energy and impact parameter. Finally, we analyze the centrality dependence of the pseudorapidity of the charged particles in Au＋Au collisions at energies from √SNN=19.6 to 200 GeV. The theoretical results are in good agreement with the experimental observations of the RHIC-PHOBOS collaboration.