η production in proton-nucleus collisions near threshold

The η-meson production in proton-nucleus (pA) collisions near threshold is studied within a relativistic meson-exchange model. The primary production amplitude is presented in the distorted-wave impulse approximation for the nucleus with isospin 0 or 1 by assuming that N^*(1535) is excited via a meson exchange and then decays into η and nucleon pair(ηN). Taking ¹⁸O and ¹²C nuclei as examples, we evaluate the production cross sections as a function of the incident proton energy, and analyze the effects of nuclear medium and various meson-exchange contributions. Finally we discuss implications for further     

A Novel Method for PIT Effects Based on Plasmonic Decoupling

A tunable dual-band stop-band THz spectrum can be realized in a hybrid structure, which consists of metal nanoribbon arrays clad by graphene nanoribbons. Dual-band spectra can be controlled separately by the nanoribbon width ω and graphene chemical potential μ_c. We explain that two local plasmonic modes excited at graphene ribbons belong to different gratings, which uncouple with each other by electro-magnetic shielding of the metal ribbons. Furthermore, plasmonic induced transparent(PIT) effects can also be realized by making the two transmission notches close to each other, with better performance than the PIT system based on plasmonic coupling,such as with a larger extinction radio and a tunable transparency window.     

大学物理课程思政几个具体问题理论探讨

成熟的理论才能正确指导实践,大学物理课程思政亦然.从物理内容中能概括出不少哲学结论因而物理学与马克思主义原理同根同源,物理学史中有很多培养科学精神、家国情怀等的好素材,这些都是大学物理课程思政的优势.思政元素和思政内容的明确界定、思政内容系统化有利于大学物理课程思政理论体系的构建,也有利于明确思政内容的边界和避免思政内容的单一.     

在α(p,p')ηα反应中的N(1535)激发及η介子产生

在相对论介子与核相互作用理论框架下, 对α(p,p')ηα反应进行了理论分析, 讨论了在入射质子和靶核上的N^*(1535)激发机制的特点. 以⁴He靶核为例, 在入射质子动能T_p=2.8GeV的情况下, 计算了反应截面, 末态ηN不变质量谱和出射η介子的角分布, 讨论了在兰州重离子冷却储存环(CSR)上开展实验研究的意义和可能性.     

橡皮筋热力学性质的教学探讨

本文基于热力学第一、二定律及麦克斯韦关系，系统讨论了橡皮筋的热力学性质，并简单介绍了橡皮筋弹性的微观模型.与传统热学教学中以理想气体为例相比，这些方法与结论既有利于学生理解与掌握热力学基本知识与研究方法，又有利于学生自主设计实验去验证这些结论的正确性.