Octupole states in <SUP>207</SUP>Tl studied through β decay

Berry, TA, Podolyak, Zs, Carroll, RJ, Lica, R, Brown, BA, Grawe, H, Sotty, Ch, Timofeyuk, NK, Alexander, T, Andreyev, AN
et al (show 57 more authors) (2020) Octupole states in <SUP>207</SUP>Tl studied through β decay. PHYSICAL REVIEW C, 101 (5). 054311-.

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The β decay of Hg207 into the single-proton-hole nucleus Tl207 has been studied through γ-ray spectroscopy at the ISOLDE Decay Station (IDS) with the aim of identifying states resulting from coupling of the πs1/2-1, πd3/2-1, and πh11/2-1 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 Pb208 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
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 01 Jun 2020 09:13
Last Modified: 21 Jun 2024 00:46
DOI: 10.1103/PhysRevC.101.054311
Open Access URL: https://doi.org/10.1103/PhysRevC.101.054311
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3089219