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题名: Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208
作者: Cao, LG ;  Roca-Maza, X ;  Colo, G ;  Sagawa, H
刊名: PHYSICAL REVIEW C
出版日期: 2015
卷号: 92, 期号:3, 页码:34308
学科分类: Physics
DOI: http://dx.doi.org/10.1103/PhysRevC.92.034308
通讯作者: Cao, LG (reprint author), North China Elect Power Univ, Sch Math & Phys, Beijing 102206, Peoples R China.
文章类型: Article
英文摘要: We investigate the impact of the neutron skin thickness, Delta R-np, on the energy difference between the anti-analog giant dipole resonance (AGDR), E-AGDR, and the isobaric analog state (IAS), E-IAS, in a heavy nucleus such as Pb-208. For guidance, we first develop a simple and analytic, yet physical, approach based on the droplet model that linearly connects the energy difference E-AGDR - E-IAS with Delta R-np. To test this correlation on more fundamental grounds, we employ a family of systematically varied Skyrme energy density functionals where variations on the value of the symmetry energy at saturation density J are explored. The calculations have been performed within the fully self-consistent Hartree-Fock (HF) plus charge-exchange random phase approximation (RPA) framework. We confirm the linear correlation within our microscopic approach and we can compare our results with available experimental data in Pb-208 in order to extract a preferred value for Delta R-np and, in turn, for the symmetry energy parameters. Averaging the results from two available experimental data, our analysis gives Delta R-np = 0.236 +/- 0.018 fm, J = 33.2 +/- 1.0 MeV, and a slope parameter of the symmetry energy at saturation L = 97.3 +/- 11.2 MeV. The errors include the experimental uncertainties and a lower-limit estimate of model uncertainties. These results are consistent with those extracted from different experimental data albeit L and Delta R-np are somewhat large when compared to previous estimations based on giant resonance studies. Possible hints whether model dependence can explain this difference are provided.
类目[WOS]: Physics, Nuclear
关键词[WOS]: HEAVY-ION COLLISIONS ;  DENSE MATTER ;  NUCLEI ;  ISOTOPES ;  EXCITATION ;  EQUATION ;  RADII ;  STARS ;  STATE
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11175216, 11575060, 11435014] ;  Fundamental Research Funds for the Central Universities [JB2014241]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20863
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Cao, LG,Roca-Maza, X,Colo, G,et al. Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208[J]. PHYSICAL REVIEW C,2015,92(3):34308.
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