A1 Journal article (refereed)
Octupole states in 207Tl studied through β decay (2020)

Berry, T. A., Podolyák, Zs., Carroll, R. J., Lica, R., Brown, B. A., Grawe, H., Sotty, Ch., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Cresswell, J. R., Fahlander, C., Fraile, L. M., Fynbo, H. O. U., Gamba, E., Gelletly, W., . . . De Witte, H. (2020). Octupole states in 207Tl studied through β decay. Physical Review C, 101(5), Article 054311. https://doi.org/10.1103/PhysRevC.101.054311

JYU authors or editors

Publication details

All authors or editorsBerry, T. A.; Podolyák, Zs.; Carroll, R. J.; Lica, R.; Brown, B. A.; Grawe, H.; Sotty, Ch.; Timofeyuk, N. K.; Alexander, T.; Andreyev, A. N.; et al.

Journal or seriesPhysical Review C



Publication year2020


Issue number5

Article number054311

PublisherAmerican Physical Society

Publication countryUnited States

Publication languageEnglish


Publication open accessOpenly available

Publication channel open accessPartially open access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/69111


The β decay of 207Hg into the single-proton-hole nucleus 207Tl has been studied through γ-ray spectroscopy at the ISOLDE Decay Station (IDS) with the aim of identifying states resulting from coupling of the πs−11/2, πd−13/2, and πh−111/2 shell model orbitals to the collective octupole vibration. Twenty-two states were observed lying between 2.6 and 4.0 MeV, eleven of which were observed for the first time, and 78 new transitions were placed. Two octupole states (s1/2-coupled) are identified and three more states (d3/2-coupled) are tentatively assigned using spin-parity inferences, while further h11/2-coupled states may also have been observed for the first time. Comparisons are made with state-of-the-art large-scale shell model calculations and previous observations made in this region, and systematic underestimation of the energy of the octupole vibrational states is noted. We suggest that in order to resolve the difference in predicted energies for collective and noncollective t=1 states (t is the number of nucleons breaking the 208Pb core), the effect of t=2 mixing may be reduced for octupole-coupled states. The inclusion of mixing with t=0,2,3 excitations is necessary to replicate all t=1 state energies accurately.

Keywordsnuclear physics

Free keywordsbeta decay; collective levels; nuclear structure and decays; nucleon distribution

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Ministry reportingYes

Reporting Year2020

JUFO rating2

Last updated on 2024-22-04 at 12:15