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Principal components of nuclear mass models

Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 65-71页

作者： Xin-Hui Wu Pengwei Zhao Department of Physics Fuzhou UniversityFuzhou 350108China State Key Laboratory of nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Principal component analysis(PCA)is employed to extract the principal components(PCs)present in nuclear mass models for the first *** effects from different nuclear mass models are reintegrated and reorganized in the extracted *** PCs are recombined to build new mass models,which achieve better accuracy than the original theoretical mass *** comparison indicates that using the PCA approach,the effects contained in different mass models can be collaborated to improve nuclear mass predictions.

关键词： nuclear mass principal component analysis nuclear models statistical methods

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Observation of Influence of Nucleons＇ Motion on Kaons Collective Flow in Dense Medium

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Chinese Physics Letters 2010年第1期27卷 92-95页

作者：邢永忠郑玉明王艳艳张林屈世显 College of Physics and Information Technology Shaanxi Normal University Xi'an 710062 Department of Physics Tianshui Normal University Tianshui 741000 China Institute of Atomic Energy PO Box 275(18) Beijing 102413

In order to extract the information of the momentum-dependent interaction of kaons under the extreme condition, the properties of the positively charged kaons produced in a heavy ion collision are studied via a simple model which has an invariable nucleon＇s velocity. Our special attention is focused on the observation of the dependence of the kaon＇s properties on the motion of nucleons in a hot and dense nuclear environment. Starting from two kinds of kaon quasiparticle models defined in transport theories for simulating heavy ion collisions, we calculate the effective mass and potential of the K＋＇s produced in the collisions and find that these properties not only depend closely on the velocity of nucleons but the dependence varies with kaon＇s quasiparticle model. It is clearly shown that the motion of nucleons reduces the momentum of K＋＇s at a given rapidity and thus weakens the rapidity distribution of K＋＇s directed flow in realistic nuclear collisions.

关键词： PARTICLE acceleration KAONS TRANSPORT theory (Mathematics) HEAVY ion collisions QUASIPARTICLES (Physics) EFFECTIVE mass (Physics) nuclear models

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Yrast Properties of Dysprosium Isotopes in the Double Mid-Shell Region

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Chinese Physics Letters 2010年第1期27卷 78-81页

作者：邹文华顾建中 School of nuclear Engineering and Technology East China Institute of Technology Fuzhou 344000 China Institute of Atomic Energy PO Box 275(18) Beijing 102413 Center of Theoretical nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000

The yrast bands of the even-even dysprosium isotopes 164-174Dy are calculated up to high angular momentum 34h based on the projected shell model. Our calculations are in good agreement with the experiments quantitatively. They predict that an energy minimum of the first 2＋ state in these isotopes exists around the neutron mid-shell N=104, implying the maximum collectivity in 66170Dy104, however, the energy ratio R4=E（4＋1）/E（2＋1） reaches a saturation at N=102. Meanwhile, the back-bending plots of these yrast bands are examined carefully. It is found that the sharpness of the back-bending has a gradual shift along the dysprosium isotopic chain, namely, the slope of the back-bending becomes steeper as the neutron number increases except for an irregularity of a decreasing dip angle in the double mid-shell nucleus 170Dy. We suggest that 170Dy undergoes a dual alignment with midshell high-j protons and neutrons aligning simultaneously at spin I≈16h, which probably results in the distinctive back-bending behavior.

关键词： DYSPROSIUM ISOTOPES ANGULAR momentum (nuclear physics) ENERGY levels (Quantum mechanics) NEUTRONS nuclear models

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Z＇ Mixing Effect in Stueckelberg Extended Effective Theory

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Chinese Physics Letters 2009年第8期26卷 54-57页

作者：张盈 School of Science Xi'an Jiaotong University Xi'an 710049

Z＇gauge boson often appears in extended electroweak models. As a neutral gauge bosons, Z＇ mixes with electroweak bosons Z-γ, in mass and kinetic parts. A genera] effective Lagrangian with symmetry SU（2）L γ U（1） U（1）＇ is constructed to describe Z＇ physics, which includes three-body mass and kinetic mixings. Z＇ contributions to mass eigenvalues of electroweak gauge bosons and couplings to fermions have also been discussed.

关键词： GAUGE field theory BOSONS ELECTROWEAK interactions nuclear models ATOMIC mass FERMIONS LAGRANGE equations SYMMETRY (Physics)

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