期刊
PHYSICAL REVIEW C
卷 87, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.87.034301
关键词
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资金
- Italian Research Project Many-body theory of nuclear systems and implications on the physics of neutron stars (PRIN)
- MZOS [1191005-1010]
- Croatian Science Foundation
- National Natural Science Foundation of China [10875150, 11175216]
- Project of Knowledge Innovation Program (PKIP) of Chinese Academy of Sciences [KJCX2-EW-N01]
Recent improvements in the experimental determination of properties of the isovector giant quadrupole resonance (IVGQR), as demonstrated in the A = 208 mass region, may be instrumental for characterizing the isovector channel of the effective nuclear interaction. We analyze properties of the IVGQR in Pb-208, using both macroscopic and microscopic approaches. The microscopic method is based on families of nonrelativistic and covariant energy density functionals (EDF), characterized by a systematic variation of isoscalar and isovector properties of the corresponding nuclear matter equations of state. The macroscopic approach yields an explicit dependence of the nuclear symmetry energy at some subsaturation density, for instance S(rho = 0.1 fm(-3)), or the neutron skin thickness Delta r(np) of a heavy nucleus, on the excitation energies of isoscalar and isovector GQRs. Using available data it is found that S(rho = 0.1 fm(-3)) = 23.3 +/- 0.6 MeV. Results obtained with the microscopic framework confirm the correlation of the Delta r(np) to the isoscalar and isovector GQR energies, as predicted by the macroscopic model. By exploiting this correlation together with the experimental values for the isoscalar and isovector GQR energies, we estimate Delta r(np) = 0.14 +/- 0.03 fm for Pb-208, and the slope parameter of the symmetry energy: L = 37 +/- 18 MeV. DOI: 10.1103/PhysRevC.87.034301
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