One- and two-quasiparticle states in the complex energy plane

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One- and two-quasiparticle states are studied in the complex energy plane. It is found that the pairing interaction does not change the character of the complex state. If a normal state is a physically meaningful resonance, then it will remain as such throughout the shell and if it is unphysical it...

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Detalles Bibliográficos
Autores principales: Dussel, Guillermo Gaspar, Betan, Rodolfo Mohamed
Publicado: 2007
Materias:
Continuum
Quasiparticle resonances
Weakly-bound nuclei
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03759474_v789_n1-4_p182_Dussel
http://hdl.handle.net/20.500.12110/paper_03759474_v789_n1-4_p182_Dussel
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03759474_v789_n1-4_p182_Dussel
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spelling paper:paper_03759474_v789_n1-4_p182_Dussel2023-06-08T15:38:21Z One- and two-quasiparticle states in the complex energy plane Dussel, Guillermo Gaspar Betan, Rodolfo Mohamed Continuum Quasiparticle resonances Weakly-bound nuclei One- and two-quasiparticle states are studied in the complex energy plane. It is found that the pairing interaction does not change the character of the complex state. If a normal state is a physically meaningful resonance, then it will remain as such throughout the shell and if it is unphysical it will also remain as such throughout the shell. An important consequence of this is that it justifies the use of bound representations to evaluate many-body systems within the shell-model in cases where the single-particle states are narrow resonances. The character of two-quasiparticle states may oscillate between meaningful resonances and unphysical complex excitations as the number of particles increases. © 2007 Elsevier B.V. All rights reserved. Fil:Dussel, G.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Id Betan, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03759474_v789_n1-4_p182_Dussel http://hdl.handle.net/20.500.12110/paper_03759474_v789_n1-4_p182_Dussel
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Continuum
Quasiparticle resonances
Weakly-bound nuclei
spellingShingle Continuum
Quasiparticle resonances
Weakly-bound nuclei
Dussel, Guillermo Gaspar
Betan, Rodolfo Mohamed
One- and two-quasiparticle states in the complex energy plane
topic_facet Continuum
Quasiparticle resonances
Weakly-bound nuclei
description One- and two-quasiparticle states are studied in the complex energy plane. It is found that the pairing interaction does not change the character of the complex state. If a normal state is a physically meaningful resonance, then it will remain as such throughout the shell and if it is unphysical it will also remain as such throughout the shell. An important consequence of this is that it justifies the use of bound representations to evaluate many-body systems within the shell-model in cases where the single-particle states are narrow resonances. The character of two-quasiparticle states may oscillate between meaningful resonances and unphysical complex excitations as the number of particles increases. © 2007 Elsevier B.V. All rights reserved.
author Dussel, Guillermo Gaspar
Betan, Rodolfo Mohamed
author_facet Dussel, Guillermo Gaspar
Betan, Rodolfo Mohamed
author_sort Dussel, Guillermo Gaspar
title One- and two-quasiparticle states in the complex energy plane
title_short One- and two-quasiparticle states in the complex energy plane
title_full One- and two-quasiparticle states in the complex energy plane
title_fullStr One- and two-quasiparticle states in the complex energy plane
title_full_unstemmed One- and two-quasiparticle states in the complex energy plane
title_sort one- and two-quasiparticle states in the complex energy plane
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03759474_v789_n1-4_p182_Dussel
http://hdl.handle.net/20.500.12110/paper_03759474_v789_n1-4_p182_Dussel
work_keys_str_mv AT dusselguillermogaspar oneandtwoquasiparticlestatesinthecomplexenergyplane
AT betanrodolfomohamed oneandtwoquasiparticlestatesinthecomplexenergyplane
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