Experimental evidence of chaos in the bound states of Pb-208

Theoretical calculations, especially shell-model calculations, have shown a strongly chaotic behavior of bound states at higher excitation energy, in regions of high level density. However, it had not been possible up to now to observe chaos in the experimental bound energy levels of any single nucl...

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Detalles Bibliográficos
Autores: Muñoz Muñoz, Laura, Molina, R. A., Gómez Gómez, José María, Heusler, A.
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/18737
Acceso en línea:https://hdl.handle.net/20.500.14352/18737
Access Level:acceso abierto
Palabra clave:539.1
Energy levels
Física nuclear
2207 Física Atómica y Nuclear
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spelling Experimental evidence of chaos in the bound states of Pb-208Muñoz Muñoz, LauraMolina, R. A.Gómez Gómez, José MaríaHeusler, A.539.1Energy levelsFísica nuclear2207 Física Atómica y NuclearTheoretical calculations, especially shell-model calculations, have shown a strongly chaotic behavior of bound states at higher excitation energy, in regions of high level density. However, it had not been possible up to now to observe chaos in the experimental bound energy levels of any single nucleus. In this paper we study the spectral fluctuations of the Pb-208 nucleus using the complete experimental spectrum of 151 states up to excitation energies of 6.20 MeV. For natural parity states the results are very close to the predictions of Random Matrix Theory (RMT) for the nearest-neighbor spacing distribution. By contrast, the results for unnatural parity states are far from RMT behavior. We interpret these results as a consequence of the strength of the residual interaction in Pb-208, which, according to experimental data, is much stronger for natural than for unnatural parity states. In addition our results show that chaotic and non-chaotic nuclear states coexist in the same energy region of the spectrum.IOP Publishing LtdUniversidad Complutense de Madrid20182018-01-0120182018-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/18737reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/187372026-06-02T12:44:21Z
dc.title.none.fl_str_mv Experimental evidence of chaos in the bound states of Pb-208
title Experimental evidence of chaos in the bound states of Pb-208
spellingShingle Experimental evidence of chaos in the bound states of Pb-208
Muñoz Muñoz, Laura
539.1
Energy levels
Física nuclear
2207 Física Atómica y Nuclear
title_short Experimental evidence of chaos in the bound states of Pb-208
title_full Experimental evidence of chaos in the bound states of Pb-208
title_fullStr Experimental evidence of chaos in the bound states of Pb-208
title_full_unstemmed Experimental evidence of chaos in the bound states of Pb-208
title_sort Experimental evidence of chaos in the bound states of Pb-208
dc.creator.none.fl_str_mv Muñoz Muñoz, Laura
Molina, R. A.
Gómez Gómez, José María
Heusler, A.
author Muñoz Muñoz, Laura
author_facet Muñoz Muñoz, Laura
Molina, R. A.
Gómez Gómez, José María
Heusler, A.
author_role author
author2 Molina, R. A.
Gómez Gómez, José María
Heusler, A.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 539.1
Energy levels
Física nuclear
2207 Física Atómica y Nuclear
topic 539.1
Energy levels
Física nuclear
2207 Física Atómica y Nuclear
description Theoretical calculations, especially shell-model calculations, have shown a strongly chaotic behavior of bound states at higher excitation energy, in regions of high level density. However, it had not been possible up to now to observe chaos in the experimental bound energy levels of any single nucleus. In this paper we study the spectral fluctuations of the Pb-208 nucleus using the complete experimental spectrum of 151 states up to excitation energies of 6.20 MeV. For natural parity states the results are very close to the predictions of Random Matrix Theory (RMT) for the nearest-neighbor spacing distribution. By contrast, the results for unnatural parity states are far from RMT behavior. We interpret these results as a consequence of the strength of the residual interaction in Pb-208, which, according to experimental data, is much stronger for natural than for unnatural parity states. In addition our results show that chaotic and non-chaotic nuclear states coexist in the same energy region of the spectrum.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-01-01
2018
2018-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/18737
url https://hdl.handle.net/20.500.14352/18737
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing Ltd
publisher.none.fl_str_mv IOP Publishing Ltd
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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