Naslov
Neutron skin thickness from the measured electric dipole polarizability in Ni68, Sn120, and Pb208

Autori
Roca-Maza, Xavier ; Vinas, Xavier ; Centelles, Mario ; Agrawal, B. K. ; Colo, Gianluca ; Paar, Nils ; Piekarewicz, Jorge ; Vretenar, Dario

Izvornik
Physical review. C, Nuclear physics (0556-2813) 92 (2015), 6; 064304, 11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
neutron skin ; electric dipole polarizability ; nuclear energy density functional

Sažetak
The information on the symmetry energy and its density dependence is deduced by comparing the available data on the electric dipole polarizability αD of Ni68, Sn120, and Pb208 with the predictions of the random-phase approximation, using a representative set of nuclear energy density functionals. The calculated values of αD are used to validate different correlations involving αD, the symmetry energy at the saturation density J, the corresponding slope parameter L, and the neutron skin thickness Δrnp, as suggested by the droplet model. A subset of models that reproduce simultaneously the measured polarizabilities in Ni68, Sn120, and Pb208 are employed to predict the values of the symmetry energy parameters at saturation density and Δrnp. The resulting intervals are J=30–35 MeV, L=20–66 MeV ; and the values for Δrnp in Ni68, Sn120, and Pb208 are in the ranges 0.15–0.19, 0.12–0.16, and 0.13–0.19 fm, respectively. The strong correlation between the electric dipole polarizabilities of two nuclei is instrumental to predict the values of electric dipole polarizabilities in other nuclei.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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