相对论核多体理论中的自洽问题和求和规则

着重讨论了建立在相对论平均场基态上的相对论无规位相近似的自洽处理 .自洽处理要求基态和巨共振激发态的研究从同一个拉氏量出发,采用同一种建立在相对论下的完备基上的近似 .同时也讨论了自洽条件下Dirac海核子态的作用 ,指出 Dirac海核子态的贡献不能忽略 ,特别是在核的巨单极共振的情况.用约束的相对论平均场方法得到核的巨单极共振的能量逆权重的求和规则 ,从数值上验证了 Dirac海核子态的贡献. A consistent treatment is extremely important in relativistic approaches. We emphasized the consistent approach in relativistic random phase approximation built on relativistic mean filed ground states. The consistent treatment requires that the studies of the ground state and excited states of giant resonances are based on same effective Lagrangian, and on a same complete set of basis. It was found that the effect of the Dirac states could not be neglected, especially in the case of giant...     

电子准弹性散射宇称不守恒中的奇异夸克效应

采用相对论平均场模型，计算了１２Ｃ和４０Ｃａ的准弹性电子散射的字称不守恒不对称性Ａ．研究了核内奇异夸克成份对Ａ的影响。     

新核素265Bh及其α衰变链上核的基态性质

运用变形的相对论平均场理论系统地探讨了新核素Bh及其va衰变链的基态性质. 对关联的处理采用了BCS方法, 不成对核子的处理运用了``阻塞"法后,所计算的结合能和四极形变符合了有限力程小液滴模型的结果, 计算表明研究的va衰 变链具有中等大小的长椭球形变; 且计算的va衰变能Q_α成功地与实验符合.在此基础上进一步研究了新核素Bh的单粒子能级.     

6Li与核弹性散射的微观光学势

从基本的Dirac-Brueckner-Hartree-Fock微观理论出发，得到同时包含实部和虚部的核子-核散射的微观光学势，并利用折叠模型直接获得了核-核散射参数无关的整体微观光学势.考虑到核-核散射去弹过程高级项的贡献和⁶Li的碎裂效应，在微观光学势的实部和虚部中引入了修正因子N_R，N_I.系统研究了入射粒子⁶Li与靶核¹²C，²⁸Si，相似文献   

相对论微观光学势中的同位旋相关项

采用Dirac Brueckner-Hartree-Fock方法研究同位旋相关的相对论微观光学势, 讨论了其同位旋相关项的处理.采用定域密度近似得到有限核的微观光学势, 以²⁰⁸Pb为例讨论了光学势的同位旋相关性,并与唯象的Lane势进行了比较.     

Nuclear structure around 80Zr

Recent years have witnessed intense activity concerning the study of nuclei with equal numbers of neutrons and protons （N = Z）. Exotic properties have been exhibited in the N = Z nuclei, especially in those with atomic masses around 80. In the present paper, the projected shell model（PSM）together with a relativistic Hartree-Bogoliubov （RHB） theory is used to study the nuclear structure near the N = Z line in the mass A ≈ 80 region. For three Zr isotopes 80,82,84Zr, the projected potential energy surfaces and ground state bands are calculated. It is shown that shape coexistence occurs in all of these nuclei. Moreover, we find that the residual neutron-proton interaction strongly affects the ground state band of 80Zr; however, it slightly modifies those of 82Zr and 84Zr.     

相对论Hartree-Fock研究奇特核的性质

采用相对论Hartree-Fock(RHF)理论来描述奇特核的性质.为了研究Fock项和矢量介子对奇特核性质的贡献和避免有效相互作用的不惟一性,本文推广应用没有自由参数的密度有关的相对论Hartree(RDH)和Hartree-Fock(RDHF)理论来描述奇特核的性质.在RDH和RDHF近似下,计算了钙同位素链的性质,特别研究了Fock交换项和矢量介子的贡献.研究表明交换项和矢量介子对非常丰中子核的性质,如结合能,中子均方根半径,中子密度分布的影响是非常不同于对稳定线附近核性质的影响.同时,对研究滴线奇特核性质的重要性及其理论模型做了简单的讨论.     

晕核和推广的Glauber理论

简要介绍了中子晕和质子晕研究的最新实验进展,同时,讨论了近年来发展的同位旋,能量有关的具有晕核结构的Glauber理论及它在描述晕核与核散射时的重要性.The development of new experiments for neutron (or proton) halo is briefly described, while the isospin and energy dependence of Glauber theory and its importance in describing halo nuclei-nucleus scattering are discussed.     

中能质子相对论光学势分析

本文采用一套普适的中能质子相对论唯象光学势定性地讨论了光学势参数对散射截面及自旋观察量的影响.分析表明,与低能情况不同,当核子能量大于300MeV时,散射总截面随能量变化很缓慢,位势的强度变化对总截面影响也较小,但散射角分布和自旋观察量不仅依赖于光学势的体积分,还依赖于光学势的强度和形状.文章还讨论了Walecka模型给出的相对论微观光学势在中能范围的适用程度.     

A Separable Pairing Force in Nuclear Matter

The method introduced by Duguet is adopted to derive a separable form of the pairing interaction in the ^1So channel from a bare or an effective nucleon-nucleon （NN） interaction in nuclear matter. With this approach the separable pairing interaction reproduces the pairing properties provided by its corresponding NN interaction. In this work, separable forms of pairing interactions in the ^1So channel for the bare NN interaction, Bonn potential and the Gogny effective interaction are obtained. It is found that the separable force of the Gogny effective interaction in the 1So channel has a clear link with the bare NN interaction. With such a simple separable form pairing properties provided by the Gogny force in nuclear matter can be reproduced.