Naslov
A microscopic estimate of the nuclear matter compressibility and symmetry energy in relativistic mean-field models

Autori
Vretenar, Dario ; Nikšić, Tamara ; Ring, Peter

Izvornik
Physical review. C, Nuclear physics (0556-2813) 68 (2003), 2; 024310-9

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

Ključne riječi
nuclear matter; nuclear field theory; giant resonances; nuclei with mass number 90 to 149; nuclei with mass number 190 to 219; ground states; random processes; nuclear collective model

Sažetak
The relativistic mean-field plus random phase and quasiparticle random phase approximation calculations, based on effective Lagrangians with density-dependent meson-nucleon vertex functions, are employed in a microscopic analysis of the nuclear matter compressibility and symmetry energy. We compute the isoscalar monopole response of 90Zr, 116Sn, 144Sm, the isoscalar monopole and isovector dipoles response of 208Pb, and also the differences between the neutron and proton radii for 208Pb and several Sn isotopes. The comparison of the calculated excitation energies with the experimental data on the giant monopole resonances restricts the nuclear matter compression modulus of structure models based on the relativistic mean-field approximation to Knm 250-270 MeV. The isovector giant dipole resonance in 208Pb and the available data on differences between the neutron and proton radii limit the range of the nuclear matter symmetry energy at saturation (volume asymmetry) of these effective interactions to 32 MeV < a4 < 36 MeV.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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