De Gregorio, Giovanni (2017) Microscopic multiphonon approach to spectroscopic properties of even and odd nuclei. [Tesi di dottorato]

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Tipologia del documento: Tesi di dottorato
Lingua: English
Titolo: Microscopic multiphonon approach to spectroscopic properties of even and odd nuclei
Autori:
AutoreEmail
De Gregorio, Giovannidegregorio@na.infn.it
Data: 9 Aprile 2017
Numero di pagine: 104
Istituzione: Università degli Studi di Napoli Federico II
Dipartimento: Fisica
Dottorato: Fisica
Ciclo di dottorato: 29
Coordinatore del Corso di dottorato:
nomeemail
Capozziello, Salvatorecapozzie@na.infn.it
Tutor:
nomeemail
Andreozzi, Francesco[non definito]
Lo Iudice, Nicola[non definito]
Data: 9 Aprile 2017
Numero di pagine: 104
Parole chiave: Many body method, E1 response in nuclei, nuclear collective modes
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/04 - Fisica nucleare e subnucleare
Depositato il: 03 Mag 2017 15:21
Ultima modifica: 08 Mar 2018 10:58
URI: http://www.fedoa.unina.it/id/eprint/11681
DOI: 10.6093/UNINA/FEDOA/11681

Abstract

The formalism of an equation of motion phonon method is 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. The method has been implemented numerically for studying the electric dipole response in the heavy neutron rich 208Pb and 132Sn, in the open shell 20O and in the odd 17O and 17F. Self-consistent calculations, using a chiral 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. Moreover, the spectroscopic properties at low energy of odd nuclei are also investigated through the calculation of moments, electromagnetic and β-decay transition strengths. The analysis of the particle-phonon composition of the eigenfunctions contributes to clarify the mechanism of excitation of levels and resonances and gives unique insights into their nature.

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