Dipole response in Sn132 within a self-consistent multiphonon approach

F. Knapp, N. Lo Iudice, P. Veselý, F. Andreozzi, G. De Gregorio, and A. Porrino
Phys. Rev. C 90, 014310 – Published 16 July 2014

Abstract

A self-consistent calculation is performed within an equation of motion method to study the electric dipole response in the neutron rich Sn132 with special attention at the low-energy excitations associated with the pygmy dipole resonance. A basis of one- plus two-phonon states is constructed by solving iteratively a set of equations of motion and adopted to bring the nuclear Hamiltonian to diagonal form. The phonons are generated in a Tamm-Dancoff approximation using a Hartree-Fock basis. The Hamiltonian is composed of an intrinsic kinetic term and an optimized two-body chiral potential. If complemented with a weak phenomenological density dependent term, such a potential improves substantially the description of the dipole response as compared to other realistic interactions. The two-phonon states play an important role in determining the fine structure of the giant dipole resonance and in enhancing the fragmentation of the strength at low energy, in fair agreement with the available data. Insights into the nature of the excitations building up the pygmy resonance are gained from the analysis of the phonon composition and shell structure of the states.

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  • Received 4 April 2014
  • Revised 30 May 2014

DOI:https://doi.org/10.1103/PhysRevC.90.014310

©2014 American Physical Society

Authors & Affiliations

F. Knapp1, N. Lo Iudice2,3, P. Veselý4, F. Andreozzi2,3, G. De Gregorio2,3, and A. Porrino2,3

  • 1Institute of Particle and Nuclear Physics, Charles University, 180 00 Prague 8, Czech Republic
  • 2Dipartimento di Fisica, Università di Napoli “Federico II,” I-80126 Napoli, Italy
  • 3INFN Sezione di Napoli, I-80126 Napoli, Italy
  • 4Institute of Nuclear Physics, Academy of Sciences, Cz-25068 Rez, Czech Republic

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Vol. 90, Iss. 1 — July 2014

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