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Title: Impact of pion dynamics on nuclear shell structure

Spin-isospin response in exotic nuclear systems is investigated. It is found that in some nuclei excitations with pionic quantum numbers (0{sup −}, 1{sup +}, 2{sup −}, …) appear at very low energies with large transition probabilities, which is an indication of the vicinity of the onset of pion condensation. As an example, 2{sup −} components of the spin-dipole resonance in {sup 78}Ni and {sup 132}Sn are considered. The existence of such modes points out to the necessity of taking into account their coupling to other elementary modes of excitation, e.g. single-quasiparticle ones. This coupling is introduced in the theory for the first time. Thereby, both rho-meson and pion-exchange contributions to the nucleon-nucleon interaction are included in the relativistic framework beyond the Hartree-Fock approximation. Namely, classes of Feynman diagrams are selected according to their significance for nuclear spectroscopic characteristics, such as single-particle energies and strength functions, and included into the nucleonic self-energy in all orders of meson-exchange. As an illustration, the impact of these new contributions on the single-particle energies of {sup 100}Sn is discussed.
Authors:
 [1] ;  [2]
  1. Department of Physics, Western Michigan University, Kalamazoo, MI 49008-5252 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22492466
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1681; Journal Issue: 1; Conference: Nuclear Structure and Dynamics '15: 3. international nuclear physics conference on nuclear structure and dynamics, Portoroz (Slovenia), 14-19 Jun 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; DIPOLES; EXCITATION; FEYNMAN DIAGRAM; HARTREE-FOCK METHOD; ISOSPIN; NICKEL 78; NUCLEON-NUCLEON INTERACTIONS; PION CONDENSATION; PIONS; QUANTUM NUMBERS; RELATIVISTIC RANGE; RHO-770 MESONS; SELF-ENERGY; SHELL MODELS; SPIN; STRENGTH FUNCTIONS; TIN 100; TIN 132