Abstract
A new β-decaying state in Bi214 has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred Iπ=(8−) assignment was suggested for this state based on the β-decay feeding pattern to levels in Po214 and shell-model calculations. The half-life of the Iπ=(8−) state was deduced to be T1/2=9.39(10) min. The deexcitation of the levels populated in Po214 by the β decay of this state was investigated via γ−γ coincidences and a number of new levels and transitions was identified. Shell-model calculations for excited states in Bi214 and Po214 were performed using two different effective interactions: the H208 and the modified Kuo-Herling particle interaction. Both calculations agree on the interpretation of the new β-decaying state as an Iπ=8− isomer and allow for tentative assignment of shell-model states to several high-spin states in Po214.Received 12 July 2021Accepted 21 October 2021DOI:https://doi.org/10.1103/PhysRevC.104.054301Published 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.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBeta decayElectromagnetic transitionsLifetimes & widthsNuclear structure & decaysShell modelProperties190 ≤ A ≤ 219Nuclear Physics
Highlights
The nuclear structure of the odd-odd, neutron-rich bismuth isotopes with A 210 provides an excellent testing ground for shell-model calculations
The identification of the new β-decaying state in 214Bi raises a question as to whether the Iπ = 1− state in 214Bi is the ground state, because the relative position of these two states could not be experimentally determined in our study
Based on the trend in neighboring 210,212Bi nuclei, supported by the shell-model calculations discussed in Sec
Summary
The nuclear structure of the odd-odd, neutron-rich bismuth isotopes with A 210 provides an excellent testing ground for shell-model calculations. Functions stemming from the [π 0h9/2 ⊗ ν1g9/2]0−,..., 9− multiplet Studying this multiplet gives important information on the residual proton-neutron interaction, while the specific ordering of these states gives rise to isomerism. The states in 214Bi were previously studied via the β− decay of the Iπ = 0+ g.s. in 214Pb and via α decay of the Iπ = (3−) g.s. of 218At [8,9,10,11] In these studies, only low-spin states (I 4) were populated, and highspin levels were inaccessible. The present study reports on the identification of a new, high-spin β-decaying state in 214Bi and on investigation of populated high-spin states in 214Po
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