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核物质和中子星物质的相对论第一性原理研究

原子核物理评论 2024年第1期41卷 299-307页

作者：王锶博曲晓英童辉王宸璨赵强 ring peter 孟杰重庆大学物理学院重庆401331 贵州民族大学物理与机电工程学院贵阳550025 波恩大学亥姆霍兹辐射与核物理研究所德国波恩D-53115 中山大学物理与天文学院广东珠海519082 基础科学研究院奇特核研究中心韩国大田34126 慕尼黑工业大学物理学院德国加兴D-85747 北京大学核物理与核技术国家重点实验室北京100871

相对论Brueckner-Hartree-Fock(RBHF)理论是相对论框架下重要的第一性原理方法,仅包含两体力即可以满意描述核物质的饱和性质。在完备的Dirac空间中自洽求解核物质RBHF方程,唯一确定了单粒子势的标量和矢量分量,避免了已有工作中由于忽... 详细信息

相对论Brueckner-Hartree-Fock(RBHF)理论是相对论框架下重要的第一性原理方法,仅包含两体力即可以满意描述核物质的饱和性质。在完备的Dirac空间中自洽求解核物质RBHF方程,唯一确定了单粒子势的标量和矢量分量,避免了已有工作中由于忽略负能态所导致的不确定性,解决了40多年来RBHF计算中不能唯一确定单粒子势的问题。本工作简要回顾RBHF理论的发展历史,阐述包含负能态做RBHF计算的必要性,介绍利用完备Dirac空间的RBHF理论,研究核物质性质和中子星物质性质的最新进展,包括有效质量、纯中子物质的每核子结合能、对称核物质和纯中子物质的压强、中子星物质的粒子分数和状态方程、中子星的质量-半径关系和潮汐形变等。最后展望了完备Dirac空间的RBHF理论在确定密度泛函理论参数、微观描述核子-原子核弹性散射和研究中子星内部强子-夸克相变等方面的可能应用。

关键词：相对论Brueckner-Hartree-Fock理论完备的Dirac空间纯中子物质中子星状态方程

A rotating α-chain in the nucleus 12C

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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 14-15页

作者： peter ring Physics Department Technical University Munich State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University

Because of the strong nuclear force among protons and neutrons,α-particles form a stable configuration not only in free space, but also in very light nuclei. Even in unstable configurations of heavy and super-heavy nuclei,α-decay is often observed. Obviously there is a high probability for the formation of anα-particle in such systems, which tunnels through the Coulomb barrier as a combined particle.

关键词： A rotating chain in the nucleus

g factors of nuclear low-lying states:A covariant description

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Science China(Physics,Mechanics & Astronomy) 2011年第2期54卷 198-203页

作者： YAO JiangMing PENG Jing MENG Jie ring peter School of Physical Science and Technology Southwest University Chongqing 400715 China Department of Physics Beijing Normal University Beijing 100875 China State Key Laboratory for Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China Department of Physics University of Stellenbosch Stellenbosh South Africa Physik-Department der Technischen Universitat Munchen D-85748 Garching Germany

The g factors and spectroscopic quadrupole moments of low-lying excited states 2+1,…,81+ in 24Mg are studied in a covariant density functional *** wave functions are constructed by configuration mixing of axially deformed mean-field states projected on good angular *** mean-field states are obtained from the constraint relativistic point-coupling model plus BCS calculations using the PC-F1 parametrization for the particle-hole channel and a density-independent delta-force for the particle-particle *** available experimental g factor and spectroscopic quadrupole moment of 21+ state are reproduced quite *** angular momentum dependence of g factors and spectroscopic quadrupole moments,as well as the effects of pairing correlations are investigated.

关键词： covariant density functional theory magnetic moment g factor spectroscopic quadrupole moment

Relativistic Quasiparticle Random Phase Approximation with a Separable Pairing Force

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Chinese Physics Letters 2009年第5期26卷 52-55页

作者：田源马中玉 ring peter China Institute of Atomic Energy Beijing 102413 Physikdepartment Technische Universitat Munchen D-85748 Garching Germany Center of Theoretical Nuclear Physics National Laboratory of Heavy Collision Lanzhou 730000

In our previous work [Phys. Lett. （to be published）, Chin. Phys. Lett. 23 （2006） 3226], we introduced a separable pairing force for relativistic Hartree-Bogoliubov calculations. This force was adjusted to reproduce the pairing properties of the Gogny force in nuclear matter. By using the well known techniques of Talmi and Moshinsky it can be expanded in a series of separable terms and converges quickly after a few terms. It was found that the pairing properties can be depicted on almost the same footing as the original pairing interaction, not only in nuclear matter, but also in finite nuclei. In this study, we construct a relativistic quasiparticle random phase approximation （RQRPA） with this separable pairing interaction and calculate the excitation energies of the first excited 2^＋ states and reduced B（E2; 0^＋ → 2^＋） transition rates for a chain of Sn isotopes in RQRPA. Compared with the results of the full Gogny force, we find that this simple separable pairing interaction can describe the pairing properties of the excited vibrational states as well as the original pairing interaction.

关键词： gamma-ray bursts gamma-rays relativity

Relativistic description of second-order correction to nuclear magnetic moments with point-coupling residual interaction

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Science China(Physics,Mechanics & Astronomy) 2011年第2期54卷 204-209页

作者： LI Jian MENG Jie ring peter YAO JiangMing ARIMA Akito State Key Laboratory for Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China Department of Physics University of Stellenbosch Stellenbosch South Africa Physik-Department der Technischen Universitat Munchen D-85748 Garching Germany School of Physical Science and Technology Southwest University Chongqing 400715 China Science Museum Japan Science Foundation 2-1 Kitanomaru-koen Chiyoda-ku Tokyo 102-0091 Japan

Using the single particle states and the residual interaction derived from the relativistic point-coupling model with the PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments of LS closed shell nuclei ±1 nucleon with A = 15,17,39 and 41 are studied and compared with previous non-relativistic *** is found that the second-order corrections are *** these corrections,the isovector magnetic moments of the concerned nuclei are well reproduced,especially those for A = 17 and A = 41.

关键词： second-order core polarization magnetic moments relativistic point-coupling model residual interaction

Restoration of rotational symmetry in deformed relativistic mean-field theory

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Chinese Physics C 2009年第S1期33卷 21-23页

作者：尧江明孟杰 Pena Arteaga Daniel ring peter School of Physics Science and technology Southwest University School of Phyics and State Key Laboratory of Nuclear Physics and Technology Peking University Physik-Department der Technischen Universitt München D-85748 Garching Germany Institute of Theoretical Physics Chinese Academy of Sciences Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Department of Physics University of Stellenbosch Stellenbosch South Africa

We report on a very recently developed three-dimensional angular momentum projected relativistic mean-field theory with point-coupling interaction (3DAMP+RMF-PC). Using this approach the same effective nucleon-nucleon interaction is adopted to describe both the single-particle and collective motions in nuclei. Collective states with good quantum angular momentum are built projecting out the intrinsic deformed meanfield states. Results for 24Mg are shown as an illustrative application.

关键词： mean-field triaxial deformation spontaneous symmetry breaking angular momentum projection

Relativistic Brueckner-Hartree-Fock Theory for Finite Nuclei

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Chinese Physics Letters 2016年第10期33卷 40-44页

作者：申时行胡金牛梁豪兆孟杰 peter ring 张双全 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking University RIKEN Nishina Center Department of Physics Nankai University Department of Physics Graduate School of ScienceThe University of Tokyo School of Physics and Nuclear Energy Engineering Beihang University Department of Physics University of Stellenbosch Physik-Department der Technischen Universitt München

Starting with a bare nucleon-nucleon interaction, for the first time the full relativistic Brueckner Hartree-Fock equations are solved for finite nuclei in a Dirac-Woods-Saxon basis. No free parameters are introduced to calculate the ground-state properties of finite nuclei. The nucleus 160 is investigated as an example. The resulting groundstate properties, such as binding energy and charge radius, are considerably improved as compared with the non-relativistic Brueckner-Hartree-Fock results and much closer to the experimental data. This opens the door for ab initio covariant investigations of heavy nuclei.

关键词： in with for of Relativistic Brueckner-Hartree-Fock Theory for Finite Nuclei RHF been body is

Leading order relativistic chiral nucleon-nucleon interaction

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Chinese Physics C 2018年第1期42卷 97-106页

作者：任修磊李凯文耿立升龙炳蔚 peter ring 孟杰 State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China Institut for Theoretische Physik II Ruhr-Universitat Bochum D-44780 Bochum Germany School of Physics and Nuclear Energy Engineering & International Research Center for Nuclei and Particles in the Cosmos Beihang University Beijing 100191 China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 China Center for Theoretical Physics Department of Physics Sichuan University Chengdu Sichuan 610064 China Physik Department Technische Universitat Miinchen D-85748 Garching Germany

Motivated by the successes of relativistic theories in studies of atomic/molecular and nuclear systems and the need for a relativistic chiral force in relativistic nuclear structure studies, we explore a new relativistic scheme to construct the nucleon-nucleon interaction in the framework of covariant chiral effective field theory. The chiral interaction is formulated up to leading order with covariant power counting and a Lorentz invariant chiral *** find that the relativistic scheme induces all six spin operators needed to describe the nuclear force. A detailed investigation of the partial wave potentials shows a better description of the;S——0 and;P;phase shifts than the leading order Weinberg approach, and similar to that of the next-to-leading order Weinberg approach. For the other partial waves with angular momenta J≥1, the relativistic results are almost the same as their leading order non-relativistic counterparts.

关键词： covariant chiral perturbation theory nucleon-nucleon interaction relativistic scattering equation

Axially Deformed Relativistic Hartree-Bogoliubov Theory With a Separable Pairing Force

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Axially Deformed Relativistic Hartree-Bogoliubov Theory With...