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A possible proton pygmy resonance in ^(17)Ne

Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 49-52页

作者： MA ZhongYu1,2 & TIAN Yuan1 1 China Institute of Atomic Energy, Beijing 102413, China 2 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Collision, Lanzhou 730000, China China Institute of Atomic Energy Beijing China Center of Theoretical Nuclear Physics National Laboratory of Heavy Collision Lanzhou China

The low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne, which can be produced at HIRFL-CSR in Lanzhou, are investigated. In the framework of the covariant density functional theory the self-consistent relativistic Hartree Bogoliubov model and the relativistic quasiparticle random phase approximation with the NL3 parameter set and Gogny pairing interaction are adopted in the calculations. A pronounced dipole peak appears below 10 MeV in17Ne, but does not occur in 17F. The prop erties of this low-lying E1 excitation in 17Ne are studied, which may correspond to a proton pygmy resonance with different characteristics from those of giant dipole resonance.

关键词： proton pygmy resonance relativistic Hartree-Bogoliubov model relativistic quasiparticle random phase approximation

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The Measurement of ^(16)O(n,γ)^(17)O Reaction at the pygmy Resonance Region

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Chinese journal of nuclear physics 1994年第3期16卷 270-274页

作者： Huang Zheng-de Zhu Li-hua Hou Long Ding Da-zhao (China Institute of Atomic Energy,P.O.Box 275(15)Beijing 102413) 中国原子能科学院北京

The 16O（n,γ）17O reaction is first realized at neutron energies from 7 to 14MeV,which is the so-called pygmy resonance *** pusled beam and time offlight techniques are *** large NaI-plastic anticoincidence shielded spectrometersare used to detect high energy gamma *** results are in good agreement withthose of the 17O（γ,n0）reaction by detailed *** integrated（γ,n0）cross section is5.88 MeV mb,which is 2.3% of energy weighted sum rule（EWSR）.

关键词： 16O(n,γ0)17O reaction pygmy resonance Giant resonance

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Probing Nuclear Symmetry Energy with Giant Dipole Resonances in Finite Nuclei

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原子核物理评论 2009年第S1期26卷 181-184页

作者： CAO Li-gang1,3,MA Zhong-yu2,3 (1 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China 2 China Institute of Atomic Energy,Beijing 102413,China 3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 730000,China) Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China China Institute of Atomic Energy Beijing 102413China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied. It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density. This linear correlation leads to the symmetry energy at the saturation density at the interval 33.0 MeV ≤ S(ρ0) ≤ 37.0 MeV,and the symmetry energy at ρ = 0.1 fm-3 at the interval 21.2-22.5 MeV. It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear matter.

关键词： symmetry energy dipole resonance pygmy resonance

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