Emerging collectivity in neutron-hole transitions near doubly magic 208Pb
Excited-state lifetimes were measured by direct fast-timing methods in three N=125 isotones — 209Po, 211Rn, and 213Ra — near doubly magic 208Pb. These nuclei have a single neutron hole and successively add pairs of protons relative to 208Pb. The first-excited state to ground-state transition, 5/21−→...
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2021
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oai:doaj.org-article:17fc56acd6c44b28a57737c19fcc99e02021-12-04T04:32:32ZEmerging collectivity in neutron-hole transitions near doubly magic 208Pb0370-269310.1016/j.physletb.2021.136738https://doaj.org/article/17fc56acd6c44b28a57737c19fcc99e02021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S037026932100678Xhttps://doaj.org/toc/0370-2693Excited-state lifetimes were measured by direct fast-timing methods in three N=125 isotones — 209Po, 211Rn, and 213Ra — near doubly magic 208Pb. These nuclei have a single neutron hole and successively add pairs of protons relative to 208Pb. The first-excited state to ground-state transition, 5/21−→1/21−, has almost identical energy in each isotone and can be associated with the single neutron-hole transition νf5/2−1→νp1/2−1. The extent to which the protons act as spectators is assessed based on the measured transition rates, which show a systematic increase along the isotone chain, and by comparisons with large-basis shell-model calculations. The shell model accounts for some of the increased transition strength but consistently underestimates the experimental values. It also fails to explain the near-constant transition energies. These results suggest emerging collectivity beyond the shell-model valence space and show that the near-constant transition energies are not a consequence of a pure neutron-hole transition, but rather the outcome of complex nucleon-nucleon correlations that increase quadrupole collectivity.M.S.M. GerathyA.J. MitchellG.J. LaneA.E. StuchberyA. AkberH.A. AlshammariL.J. BignellB.J. CoombesJ.T.H. DowieT.J. GrayT. KibédiB.P. McCormickL.J. McKieM.S. RahmanM. ReeceN.J. SpinksB.P.E. TeeY.Y. ZhongK. ZhuElsevierarticleNuclear isomersγ-ray spectroscopyLaBr3 detectorsTransition ratesNuclear collectivityNuclear shell modelPhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136738- (2021) |
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DOAJ |
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DOAJ |
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EN |
| topic |
Nuclear isomers γ-ray spectroscopy LaBr3 detectors Transition rates Nuclear collectivity Nuclear shell model Physics QC1-999 |
| spellingShingle |
Nuclear isomers γ-ray spectroscopy LaBr3 detectors Transition rates Nuclear collectivity Nuclear shell model Physics QC1-999 M.S.M. Gerathy A.J. Mitchell G.J. Lane A.E. Stuchbery A. Akber H.A. Alshammari L.J. Bignell B.J. Coombes J.T.H. Dowie T.J. Gray T. Kibédi B.P. McCormick L.J. McKie M.S. Rahman M. Reece N.J. Spinks B.P.E. Tee Y.Y. Zhong K. Zhu Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| description |
Excited-state lifetimes were measured by direct fast-timing methods in three N=125 isotones — 209Po, 211Rn, and 213Ra — near doubly magic 208Pb. These nuclei have a single neutron hole and successively add pairs of protons relative to 208Pb. The first-excited state to ground-state transition, 5/21−→1/21−, has almost identical energy in each isotone and can be associated with the single neutron-hole transition νf5/2−1→νp1/2−1. The extent to which the protons act as spectators is assessed based on the measured transition rates, which show a systematic increase along the isotone chain, and by comparisons with large-basis shell-model calculations. The shell model accounts for some of the increased transition strength but consistently underestimates the experimental values. It also fails to explain the near-constant transition energies. These results suggest emerging collectivity beyond the shell-model valence space and show that the near-constant transition energies are not a consequence of a pure neutron-hole transition, but rather the outcome of complex nucleon-nucleon correlations that increase quadrupole collectivity. |
| format |
article |
| author |
M.S.M. Gerathy A.J. Mitchell G.J. Lane A.E. Stuchbery A. Akber H.A. Alshammari L.J. Bignell B.J. Coombes J.T.H. Dowie T.J. Gray T. Kibédi B.P. McCormick L.J. McKie M.S. Rahman M. Reece N.J. Spinks B.P.E. Tee Y.Y. Zhong K. Zhu |
| author_facet |
M.S.M. Gerathy A.J. Mitchell G.J. Lane A.E. Stuchbery A. Akber H.A. Alshammari L.J. Bignell B.J. Coombes J.T.H. Dowie T.J. Gray T. Kibédi B.P. McCormick L.J. McKie M.S. Rahman M. Reece N.J. Spinks B.P.E. Tee Y.Y. Zhong K. Zhu |
| author_sort |
M.S.M. Gerathy |
| title |
Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| title_short |
Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| title_full |
Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| title_fullStr |
Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| title_full_unstemmed |
Emerging collectivity in neutron-hole transitions near doubly magic 208Pb |
| title_sort |
emerging collectivity in neutron-hole transitions near doubly magic 208pb |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://doaj.org/article/17fc56acd6c44b28a57737c19fcc99e0 |
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