Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208

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	Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208
	Cao, LG ; Roca-Maza, X ; Colo, G ; Sagawa, H
刊名	PHYSICAL REVIEW C
	2015
卷号	92 期号:3 页码:34308
通讯作者	Cao, LG (reprint author), North China Elect Power Univ, Sch Math & Phys, Beijing 102206, Peoples R China.
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.
学科主题	Physics
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
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/20863]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Cao, LG,Roca-Maza, X,Colo, G,&Sagawa, H.(2015).Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208.PHYSICAL REVIEW C,92(3),34308.
MLA	Cao, LG,et al."Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in Pb-208".PHYSICAL REVIEW C 92.3(2015):34308.