Lifetime measurements of excited states in 169,171,173Os : Persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i13/2 valence neutron
Zhang, W., Cederwall, B., Doncel, M., Aktas, Ö., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Nara, S. B., Cullen, D., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D., Fang, Y., Greenlees, P., . . . Valiente-Dobón, J. (2021). Lifetime measurements of excited states in 169,171,173Os : Persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i13/2 valence neutron. Physics Letters B, 820, Article 136527. https://doi.org/10.1016/j.physletb.2021.136527
Published inPhysics Letters B
Qi, C. |
Li, H. |
Liu, H. |
© 2021 the Authors
Lifetimes of low-lying excited states in the νi13/2+ bands of the neutron-deﬁcient osmium isotopes 169,171,173Os have been measured for the ﬁrst time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio B(E2; 21/2+ →17/2+)/B(E2; 17/2+ → 13/2+) in 169Os, similar to the “anomalously” low values of the ratio B(E2; 41+ → 21+)/B(E2; 21+ → 0+gs) previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighbouring 168,170Os. Furthermore, the evolution of B(E2; 21/2+ → 17/2+)/B(E2; 17/2+ → 13/2+) with increasing neutron number in the odd-mass isotopic chain 169,171,173Os is observed to follow the same trend as observed previously in the even-even Os isotopes. These ﬁndings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a “spectator”. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells. ...
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Additional information about fundingThis work was supported by the Swedish Research Council under Grant No. 2019-04880, the United Kingdom Science and Technology Facilities Council (STFC), the EU 7th Framework Programme, Integrating Activities Transnational Access, project No. 262010 ENSAR, and the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). E.I., Y.D.F., and M.K.R. acknowledge support from the International Joint Research Promotion Program of Osaka University. W. Zhang acknowledges support from the China Scholarship Council under grant No. 201700260239. The authors acknowledge the support of the GAMMAPOOL for the JUROGAM detectors. ...
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