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dc.contributor.authorCederwall, B.
dc.contributor.authorDoncel, M.
dc.contributor.authorAktas, Ö.
dc.contributor.authorErtoprak, A.
dc.contributor.authorLiotta, R.
dc.contributor.authorQi, C.
dc.contributor.authorGrahn, Tuomas
dc.contributor.authorCullen, D. M
dc.contributor.authorHodge, D.
dc.contributor.authorGiles, M.
dc.contributor.authorStolze, Sanna
dc.contributor.authorBadran, Hussam
dc.contributor.authorBraunroth, T.
dc.contributor.authorCalverley, Tom
dc.contributor.authorCox, Daniel
dc.contributor.authorFang, Y. D.
dc.contributor.authorGreenlees, Paul
dc.contributor.authorHilton, Joshua
dc.contributor.authorIdeguchi, E.
dc.contributor.authorJulin, Rauno
dc.contributor.authorJuutinen, Sakari
dc.contributor.authorRaju, M. Kumar
dc.contributor.authorLi, H.
dc.contributor.authorLiu, H.
dc.contributor.authorMatta, S.
dc.contributor.authorModamio, V.
dc.contributor.authorPakarinen, Janne
dc.contributor.authorPapadakis, Philippos
dc.contributor.authorPartanen, Jari
dc.contributor.authorPetrache, C. M.
dc.contributor.authorRahkila, Panu
dc.contributor.authorRuotsalainen, Panu
dc.contributor.authorSandzelius, Mikael
dc.contributor.authorSarén, Jan
dc.contributor.authorScholey, Catherine
dc.contributor.authorSorri, Juha
dc.contributor.authorSubramaniam, P.
dc.contributor.authorTaylor, M. J.
dc.contributor.authorUusitalo, Juha
dc.contributor.authorValiente-Dobón, J. J.
dc.identifier.citationCederwall, B., Doncel, M., Aktas, Ö., Ertoprak, A., Liotta, R., Qi, C., . . . Valiente-Dobón, J. J. (2018). Lifetime Measurements of Excited States in 172Pt and the Variation of Quadrupole Transition Strength with Angular Momentum. <em>Physical Review Letters</em>, 121 (2), 022502. <a href="">doi:10.1103/physrevlett.121.022502</a>fi
dc.description.abstractLifetimes of the first excited 2 + and 4 + states in the extremely neutron-deficient nuclide 172 Pt have been measured for the first time using the recoil-distance Doppler shift and recoil-decay tagging techniques. An unusually low value of the ratio B ( E 2 : 4 + 1 → 2 + 1 ) / B ( E 2 : 2 + 1 → 0 + gs ) = 0.55 ( 19 ) was found, similar to a handful of other such anomalous cases observed in the entire Segré chart. The observation adds to a cluster of a few extremely neutron-deficient nuclides of the heavy transition metals with neutron numbers N ≈ 90 – 94 featuring the effect. No theoretical model calculations reported to date have been able to explain the anomalously low B ( E 2 : 4 + 1 → 2 + 1 ) / B ( E 2 : 2 + 1 → 0 + gs ) ratios observed in these cases. Such low values cannot, e.g., be explained within the framework of the geometrical collective model or by algebraic approaches within the interacting boson model framework. It is proposed that the group of B ( E 2 : 4 + 1 → 2 + 1 ) / B ( E 2 : 2 + 1 → 0 + gs ) ratios in the extremely neutron-deficient even-even W, Os, and Pt nuclei around neutron numbers N ≈ 90 – 94 reveal a quantum phase transition from a seniority-conserving structure to a collective regime as a function of neutron number. Although a system governed by seniority symmetry is the only theoretical framework for which such an effect may naturally occur, the phenomenon is highly unexpected for these nuclei that are not situated near closed
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review Letters
dc.rightsIn Copyright
dc.subject.otherelectromagnetic transitionsfi
dc.subject.otherlifetimes and widthsfi
dc.subject.othernuclear fusionfi
dc.titleLifetime Measurements of Excited States in 172Pt and the Variation of Quadrupole Transition Strength with Angular Momentumfi
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.rights.copyright© 2018 American Physical Society

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