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Octupole states in 207Tl studied through β decay

Berry, T. A., Podolyak, Zs., Carroll, R. J., Lică, 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., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kowalska, M., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mărginean, N., Mărginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nae, S., Niţă, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Simpson, E. C., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Walker, P. M., Warr, N., Wearing, F. P. and De Witte, H. (2020) Octupole states in 207Tl studied through β decay Physical Review C, 101 (5), 054311.

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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Berry, T.
Carroll, R. J.
Lică, R.
Brown, B. A.
Grawe, H.
Sotty, Ch.
Timofeyuk, N.
Alexander, T.
Andreyev, A. N.
Ansari, S.
Borge, M. J. G.
Cresswell, J. R.
Fahlander, C.
Fraile, L. M.
Fynbo, H. O. U.
Gamba, E.
Gelletly, W.
Gerst, R.-B.
Górska, M.
Gredley, A.
Greenlees, P.
Harkness-Brennan, L. J.
Huyse, M.
Judge, S. M.
Judson, D. S.
Konki, J.
Kowalska, M.
Kurcewicz, J.
Kuti, I.
Lalkovski, S.
Lazarus, I.
Lund, M.
Madurga, M.
Mărginean, N.
Mărginean, R.
Marroquin, I.
Mihai, C.
Mihai, R. E.
Nácher, E.
Negret, A.
Nae, S.
Niţă, C.
Pascu, S.
Page, R. D.
Patel, Z.
Perea, A.
Phrompao, J.
Piersa, M.
Pucknell, V.
Rahkila, P.
Rapisarda, E.
Regan, P.
Rotaru, F.
Shand, C.
Simpson, E. C.
Stegemann, S.
Stora, T.
Tengblad, O.
Turturica, A.
Van Duppen, P.
Vedia, V.
Walker, P.
Warr, N.
Wearing, F. P.
De Witte, H.
Date : 18 May 2020
Funders : European Union's Horizon 2020, European Union Seventh Framework Programme, Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.101.054311
Copyright Disclaimer : Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Uncontrolled Keywords : Beta decay; Collective levels; Nuclear structure & decays; Nucleon distribution
Depositing User : Clive Harris
Date Deposited : 02 Jun 2020 15:26
Last Modified : 02 Jun 2020 15:26

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