https://doi.org/10.1051/epjconf/20159301018
Dipole response in neutron-rich nuclei within self-consistent approaches using realistic potentials
1 Dipartimento di Fisica, Università di Napoli Federico II, Italy
2 INFN Sezione di Napoli, Italy
3 Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic
4 Institute of Nuclear Physics, Academy of Sciences, Rez, Czech Republic
a e-mail: loiudice@na.infn.it
Published online: 28 May 2015
A nucleon-nucleon chiral potential with a corrective density dependent term simulating a three-body force is used in a self-consistent calculation of the dipole strength distribution in neutron-rich nuclei, with special attention to the low-lying spectra associated to the pygmy resonance. A Hartree-Fock-Bogoliubov basis is generated and adopted in Tamm-Dancoff and random-phase approximations and, then, in an equation of motion approach which includes a basis of two-phonon states. The direct use of the mentioned chiral potential improves the description of both giant and pygmy dipole modes with respect to other realistic interactions. Moreover, the inclusion of the two-phonon states induces a pronounced fragmentation of the giant resonance and enhances the density of the low-lying levels in the pygmy region in agreement with recent experiments.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
