A microscopic multiphonon approach to even and odd nuclei

0477317 - ÚJF 2018 RIV GB eng J - Článek v odborném periodiku
De Gregorio, G. - Knapp, F. - Lo Iudice, N. - Veselý, Petr
A microscopic multiphonon approach to even and odd nuclei.
Physica Scripta. Roč. 92, č. 7 (2017), č. článku 074003. ISSN 0031-8949. E-ISSN 1402-4896
Grant CEP: GA ČR GA13-07117S
Institucionální podpora: RVO:61389005
Klíčová slova: E1 response in nuclei * nuclear many-body theory * nuclear structure
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impakt faktor: 1.902, rok: 2017

The formalism of an equation of motion phonon method is briefly outlined. In even-even nuclei, the method derives equations of motion which generate an orthonormal basis of correlated n-phonon states (n = 0, 1, 2,...), built of constituent Tamm-Dancoff phonons, and, then, solves the nuclear eigenvalue problem in such a multiphonon basis. In odd nuclei, analogous equations yield a basis of correlated orthonormal multiphonon particle-core states to be used for the solution of the full eigenvalue equations. The formalism does not rely on approximations, but lends itself naturally to simplifying assumptions. As illustrated here, the method has been implemented numerically for studying the electric dipole response in the heavy neutron rich Pb-208 and Sn-132 and in the odd O-17 and F-17. Self-consistent calculations, using a chiral inspired Hamiltonian, have confirmed the important role of the multiphonon states in enhancing the fragmentation of the strength in the giant and pygmy resonance regions consistently with the experimental data.
Trvalý link: http://hdl.handle.net/11104/0273694