Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure
The relativistic particle-vibration coupling (RPVC) model is extended by the inclusion of isospin-flip excitation modes into the phonon space, introducing a new mechanism of dynamical interaction between nucleons with different isospin in the nuclear medium. Protons and neutrons exchange by collecti...
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Online Access: | http://www.sciencedirect.com/science/article/pii/S037026931600071X |
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doaj-5851d4a700da4e0b801cff3787a45f192020-11-24T21:18:45ZengElsevierPhysics Letters B0370-26932016-04-01755138144Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structureElena Litvinova0Department of Physics, Western Michigan University, Kalamazoo, MI 49008-5252, USA; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA; Correspondence to: Department of Physics, Western Michigan University, Kalamazoo, MI 49008-5252, USA.The relativistic particle-vibration coupling (RPVC) model is extended by the inclusion of isospin-flip excitation modes into the phonon space, introducing a new mechanism of dynamical interaction between nucleons with different isospin in the nuclear medium. Protons and neutrons exchange by collective modes which are formed by isovector π and ρ-mesons, in turn, softened considerably because of coupling to nucleons of the medium. These modes are investigated within the proton–neutron relativistic random phase approximation (pn-RRPA) and relativistic proton–neutron time blocking approximation (pn-RTBA). The appearance of isospin-flip states with sizable transition probabilities at low energies points out that they are likely to couple to the single-particle degrees of freedom and, in addition to isoscalar low-lying phonons, to modify their spectroscopic characteristics. Such a coupling is quantified for the shell structure of 100,132Sn and found significant for the location of the dominant single-particle states.http://www.sciencedirect.com/science/article/pii/S037026931600071X |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Elena Litvinova |
spellingShingle |
Elena Litvinova Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure Physics Letters B |
author_facet |
Elena Litvinova |
author_sort |
Elena Litvinova |
title |
Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure |
title_short |
Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure |
title_full |
Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure |
title_fullStr |
Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure |
title_full_unstemmed |
Pion–nucleon correlations in finite nuclei in a relativistic framework: Effects on the shell structure |
title_sort |
pion–nucleon correlations in finite nuclei in a relativistic framework: effects on the shell structure |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 |
publishDate |
2016-04-01 |
description |
The relativistic particle-vibration coupling (RPVC) model is extended by the inclusion of isospin-flip excitation modes into the phonon space, introducing a new mechanism of dynamical interaction between nucleons with different isospin in the nuclear medium. Protons and neutrons exchange by collective modes which are formed by isovector π and ρ-mesons, in turn, softened considerably because of coupling to nucleons of the medium. These modes are investigated within the proton–neutron relativistic random phase approximation (pn-RRPA) and relativistic proton–neutron time blocking approximation (pn-RTBA). The appearance of isospin-flip states with sizable transition probabilities at low energies points out that they are likely to couple to the single-particle degrees of freedom and, in addition to isoscalar low-lying phonons, to modify their spectroscopic characteristics. Such a coupling is quantified for the shell structure of 100,132Sn and found significant for the location of the dominant single-particle states. |
url |
http://www.sciencedirect.com/science/article/pii/S037026931600071X |
work_keys_str_mv |
AT elenalitvinova pionnucleoncorrelationsinfinitenucleiinarelativisticframeworkeffectsontheshellstructure |
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1726007743114903552 |