A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/4517 https://doi.org/10.1016/S0375-9474(00)00625-4 |
Resumo: | Identification of the levels in 160Sm and 162Gd in spontaneous fission studies led to the discovery of a new phenomenon, shifted identical bands (SIB). SIBs are yrast bands in neighboring nuclei (a,b) with moments of inertia which are identical when shifted by a constant amount [kappa] = -[Delta]J1/J1, so J1a(1+[kappa])= J1b, from 2+ to 8+ and higher to 16+. Building on that work, an analysis of yrast bands in even-even proton to neutron rich Xe to Pb nuclei was carried out. In over 700 comparisons, fifty-five SIBs were found for ground bands in stable to the most neutron rich Ce - W nuclei with [kappa] between 1.5% and 13%, where the spread in [kappa] is less than ±1%, and only four identical bands ([kappa][approximate, equals]0). As examples, we find for 158Sm-160Gd (from 2+ to 10+), [kappa] = -3.2+0.1-0.2% (where the ± is the total spread in [kappa] from -3.1 to -3.4) and [Delta]J2/J2 = 3.0±1.2%; 158Sm-160Sm, 3.4+0.5-0.3%; and 154Nd-158Gd, -10.4±0.2%. After the shifts, these J1 and J2 values have smaller spreads than do the outstanding examples of identical bands. The J1 values were fitted to a variable moment of inertia model with parameters J0 and C whose values correlate with the SIB J1 values. The SIBs are not correlated either with deformation, E(4+)/E(2+), or the NpNn product. Some excited bands are SIBs and IBs in proton rich Pt-Pb where nuclear shape coexistence is important. |
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7160 |
spelling |
A new phenomenon: shifted identical yrast bands in neighboring even-even nucleiIdentification of the levels in 160Sm and 162Gd in spontaneous fission studies led to the discovery of a new phenomenon, shifted identical bands (SIB). SIBs are yrast bands in neighboring nuclei (a,b) with moments of inertia which are identical when shifted by a constant amount [kappa] = -[Delta]J1/J1, so J1a(1+[kappa])= J1b, from 2+ to 8+ and higher to 16+. Building on that work, an analysis of yrast bands in even-even proton to neutron rich Xe to Pb nuclei was carried out. In over 700 comparisons, fifty-five SIBs were found for ground bands in stable to the most neutron rich Ce - W nuclei with [kappa] between 1.5% and 13%, where the spread in [kappa] is less than ±1%, and only four identical bands ([kappa][approximate, equals]0). As examples, we find for 158Sm-160Gd (from 2+ to 10+), [kappa] = -3.2+0.1-0.2% (where the ± is the total spread in [kappa] from -3.1 to -3.4) and [Delta]J2/J2 = 3.0±1.2%; 158Sm-160Sm, 3.4+0.5-0.3%; and 154Nd-158Gd, -10.4±0.2%. After the shifts, these J1 and J2 values have smaller spreads than do the outstanding examples of identical bands. The J1 values were fitted to a variable moment of inertia model with parameters J0 and C whose values correlate with the SIB J1 values. The SIBs are not correlated either with deformation, E(4+)/E(2+), or the NpNn product. Some excited bands are SIBs and IBs in proton rich Pt-Pb where nuclear shape coexistence is important.http://www.sciencedirect.com/science/article/B6TVB-42WPXP1-F/1/7073267d6d2727e1d168eeb83da1550d2001info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/4517http://hdl.handle.net/10316/4517https://doi.org/10.1016/S0375-9474(00)00625-4engNuclear Physics A. 682:1-4 (2001) 79c-87cJones, E. F.Gore, P. M.Hamilton, J. H.Ramayya, A. V.Lima, A. P. deDodder, R. S.Kormicki, J.Hwang, J. K.Beyer, C. J.Zhang, X. Q.Zhu, S. J.Ter-Akopian, G. M.Oganessian, Yu. Ts.Daniel, A. V.Rasmussen, J. O.Lee, I. Y.Cole, J. D.Drigert, M. W.Ma, W.-C.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-09-22T08:34:14Zoai:estudogeral.uc.pt:10316/4517Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:51.445585Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
title |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
spellingShingle |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei Jones, E. F. |
title_short |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
title_full |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
title_fullStr |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
title_full_unstemmed |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
title_sort |
A new phenomenon: shifted identical yrast bands in neighboring even-even nuclei |
author |
Jones, E. F. |
author_facet |
Jones, E. F. Gore, P. M. Hamilton, J. H. Ramayya, A. V. Lima, A. P. de Dodder, R. S. Kormicki, J. Hwang, J. K. Beyer, C. J. Zhang, X. Q. Zhu, S. J. Ter-Akopian, G. M. Oganessian, Yu. Ts. Daniel, A. V. Rasmussen, J. O. Lee, I. Y. Cole, J. D. Drigert, M. W. Ma, W.-C. |
author_role |
author |
author2 |
Gore, P. M. Hamilton, J. H. Ramayya, A. V. Lima, A. P. de Dodder, R. S. Kormicki, J. Hwang, J. K. Beyer, C. J. Zhang, X. Q. Zhu, S. J. Ter-Akopian, G. M. Oganessian, Yu. Ts. Daniel, A. V. Rasmussen, J. O. Lee, I. Y. Cole, J. D. Drigert, M. W. Ma, W.-C. |
author2_role |
author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Jones, E. F. Gore, P. M. Hamilton, J. H. Ramayya, A. V. Lima, A. P. de Dodder, R. S. Kormicki, J. Hwang, J. K. Beyer, C. J. Zhang, X. Q. Zhu, S. J. Ter-Akopian, G. M. Oganessian, Yu. Ts. Daniel, A. V. Rasmussen, J. O. Lee, I. Y. Cole, J. D. Drigert, M. W. Ma, W.-C. |
description |
Identification of the levels in 160Sm and 162Gd in spontaneous fission studies led to the discovery of a new phenomenon, shifted identical bands (SIB). SIBs are yrast bands in neighboring nuclei (a,b) with moments of inertia which are identical when shifted by a constant amount [kappa] = -[Delta]J1/J1, so J1a(1+[kappa])= J1b, from 2+ to 8+ and higher to 16+. Building on that work, an analysis of yrast bands in even-even proton to neutron rich Xe to Pb nuclei was carried out. In over 700 comparisons, fifty-five SIBs were found for ground bands in stable to the most neutron rich Ce - W nuclei with [kappa] between 1.5% and 13%, where the spread in [kappa] is less than ±1%, and only four identical bands ([kappa][approximate, equals]0). As examples, we find for 158Sm-160Gd (from 2+ to 10+), [kappa] = -3.2+0.1-0.2% (where the ± is the total spread in [kappa] from -3.1 to -3.4) and [Delta]J2/J2 = 3.0±1.2%; 158Sm-160Sm, 3.4+0.5-0.3%; and 154Nd-158Gd, -10.4±0.2%. After the shifts, these J1 and J2 values have smaller spreads than do the outstanding examples of identical bands. The J1 values were fitted to a variable moment of inertia model with parameters J0 and C whose values correlate with the SIB J1 values. The SIBs are not correlated either with deformation, E(4+)/E(2+), or the NpNn product. Some excited bands are SIBs and IBs in proton rich Pt-Pb where nuclear shape coexistence is important. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/4517 http://hdl.handle.net/10316/4517 https://doi.org/10.1016/S0375-9474(00)00625-4 |
url |
http://hdl.handle.net/10316/4517 https://doi.org/10.1016/S0375-9474(00)00625-4 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nuclear Physics A. 682:1-4 (2001) 79c-87c |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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