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...
| Authors: | ; ; ; |
|---|---|
| Format: | Article |
| Publication date: | 2018 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/18737 |
| Online Access: | https://hdl.handle.net/20.500.14352/18737 |
| Access Level: | Open access |
| Keyword: | 539.1 Energy levels Física nuclear 2207 Física Atómica y Nuclear |
| _version_ | 1878731409263165440 |
|---|---|
| author | Muñoz Muñoz, Laura |
| author2 | Molina, R. A. Gómez Gómez, José María Heusler, A. |
| author2_role | author author author |
| author_browse | Gómez Gómez, José María Heusler, A. Molina, R. A. Muñoz Muñoz, Laura |
| author_facet | Muñoz Muñoz, Laura Molina, R. A. Gómez Gómez, José María Heusler, A. |
| author_role | author |
| collection | Docta Complutense |
| 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_2f0a2ec006650327ebd7dc1252ccce29 |
| institution | Universidad Complutense de Madrid (UCM) |
| instname_str | Universidad Complutense de Madrid (UCM) |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:docta.ucm.es:20.500.14352/18737 |
| publishDate | 2018 |
| publishDateSort | 2018 |
| publisher | IOP Publishing Ltd |
| publisherStr | IOP Publishing Ltd |
| reponame_str | Docta Complutense |
| spelling | Experimental evidence of chaos in the bound states of Pb-208 Muñoz Muñoz, Laura Molina, R. A. Gómez Gómez, José María Heusler, A. 539.1 Energy levels Física nuclear 2207 Física Atómica y Nuclear 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. IOP Publishing Ltd https://hdl.handle.net/20.500.14352/18737 |
| 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 | 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_short | Experimental evidence of chaos in the bound states of Pb-208 |
| title_sort | Experimental evidence of chaos in the bound states of Pb-208 |
| topic | 539.1 Energy levels Física nuclear 2207 Física Atómica y Nuclear |
| topic_facet | 539.1 Energy levels Física nuclear 2207 Física Atómica y Nuclear |
| url | https://hdl.handle.net/20.500.14352/18737 |