弱相互作用费米气体的不稳定性判据

根据由赝势法得到的弱相互作用费米气体的自由能,利用热力学方法研究了无外场时弱相互作用费米气体的稳定性.结果表明,无外场情况下理想费米气体与存在弱排斥相互作用的费米气体是稳定的;而具有弱吸引相互作用的费米气体在一定条件下可出现不稳定性.给出了不稳定性的粒子数密度判据和温度判据,就不同逸度情况下临界粒子数密度的具体表达结果以及温度、粒子质量和吸引相互作用对临界粒子数密度的影响进行了讨论.关键词：费米气体相互作用不稳定性判据     

Status and recent developments in NN → NNπ

We present a summary of the recent developments in pion production in NN collisions within chiral effective field theory.     

ωNN强相互作用的核物质系统在高温下的介电性质

从QHD-1场方程出发,用动力论的方法计算得到ωNN强相互作用的核物质系统的介电函数,并具体分析了在高温下介电函数的特征及其物理背景.     

Models of πNN interactions

A NN model inspired by Quantum Chromodynamics is presented. The model gives an accurate fit to the most recent Arndt NN phase shifts up to 1 GeV and can be applied to study intermediate- and high-energy nuclear reactions.Invited talk to the symposium Mesons and Light Nuclei IV, Bechyn, Czechoslovakia, September 5–10, 1988.This work is supported by the U.S. Department of Energy, Nuclear Physics Division, under contract W-31-109-ENG-38.     

New nuclear three-body clusters φNN

Binding energies of three-body systems of the type φ + 2N are estimated. Due to the strong attraction between φ-meson and nucleon, suggested in different approaches, bound states can appear in systems like φ + np (singlet and triplet), φ + nn and φ + pp. This indicates the principal possibility of the formation of new nuclear clusters.     

将硬盘阵列技术应用于数字化理科数据库构建

目前学校的服务器基本都使用了磁盘阵列技术,在数据存储的空间大小、稳定性、安全性上就具有了保障。随着自媒体时代的到来,个人终端的存储数据量也呈现级数上升。本文就简单的讲述了将服务器上使用的磁盘阵列技术应用到个人终端存储中来,从而为数字化理科数据库的构建增容添翼、保驾护航。     

A search for πNN bound systems

The d(π⁺, π⁻)T⁺⁺⁺ and the d(π⁻, π⁺) T⁻ reactions were studied at an incident pion energy of 260 MeV. Outgoing negative pions were detected at 35° and 55° in the first reaction, and the positive pions at 45° in the second. Indications for structures corresponding to a (π⁺pp) system with a mass of 2003.0±1.0 MeV and a (π⁻nn) system with a mass of 200.1±1.5 MeV were observed with marginal statistical significance. Upper limits for the cross sections are obtained.     

The γNN1 coupling from current algebra

The γNN¹ (1238) coupling is calculated (to 17%) from a saturation at infinite momentum of the algebra of isospin current densities. In recognition of the fact that no naive saturation is sufficient, parametric transitions are introduced from the states of the saturation to neglected ones, and these parameters are then evaluated by utilizing the detailed knowledge of nucleon electromagnetic form factors.