Cederwall, B., Doncel, M., Aktas, O., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Cullen, D. M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Fang, Y. D., Greenlees, P. T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Raju, M. Kumar, Li, H., Liu, H., Matta, S., Modamio, V., Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C. M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Subramaniam, P., Taylor, M. J., Uusitalo, J. and Valiente-Dobon, J. J. (2018). Lifetime Measurements of Excited States in Pt-172 and the Variation of Quadrupole Transition Strength with Angular Momentum. Phys. Rev. Lett., 121 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Lifetimes of the first excited 2(+) and 4(+) states in the extremely neutron -deficient nuclide Pt-172 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(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) = 0.55(19) was found, similar to a handful of other such anomalous cases observed in the entire Segre chart. The observation adds to a cluster of a few extremely neutron -deficient nuclides of the heavy transition metals with neutron numbers N approximate to 90-94 featuring the effect. No theoretical model calculations reported to date have been able to explain the anomalously low B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 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(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) ratios in the extremely neutron-deficient even-even W, Os, and Pt nuclei around neutron numbers N approximate to 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 shells.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Cederwall, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Doncel, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aktas, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ertoprak, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liotta, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qi, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grahn, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cullen, D. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hodge, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giles, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stolze, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Badran, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braunroth, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Calverley, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cox, D. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fang, Y. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Greenlees, P. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hilton, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ideguchi, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Julin, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Juutinen, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Raju, M. KumarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matta, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Modamio, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pakarinen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Papadakis, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Partanen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrache, C. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rahkila, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ruotsalainen, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sandzelius, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saren, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholey, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sorri, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Subramaniam, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Taylor, M. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Uusitalo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valiente-Dobon, J. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-179821
DOI: 10.1103/PhysRevLett.121.022502
Journal or Publication Title: Phys. Rev. Lett.
Volume: 121
Number: 2
Date: 2018
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
NEUTRON-DEFICIENT; SHAPE COEXISTENCE; NUCLEI; SPECTROMETERS; EUROBALL; PLUNGERMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17982

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