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• W2990273433 abstract "Background: The neutron-deficient lead region provides a range of nuclear phenomena, including isomerism at low energies. This phenomenon can be studied by α decay because the degree of hindrance of α decay provides information on the change in nuclear structure of connected states. Purpose: The aim of this work was to investigate the α-decay properties of Fr200,202 and daughter products. Method: Neutron-deficient francium nuclei are produced at ISOLDE-CERN bombarding a UCx target with 1.4 GeV protons. Surface ionization and mass-separation techniques were employed to provide a pure radioactive ion beam at a radiation-detection setup. Results: Due to the very high statistics and the high beam purity, improved decay data for Fr202 and its daughters were obtained. In particular, this data set allowed us to identify many fine-structure α lines with a relative reduced α-decay width up to five orders of magnitude lower as the strongest ground-to-ground state or isomeric-to-isomeric state α-decay transition. In addition, several half-life values were extracted with similar or better precision as compared with the literature. Conclusions: The observation of crossover transitions positioned the isomeric high-spin level of At198 at an excitation energy of 265(3) keV. Half-life values of 4.47(5) s and 1.28(10) s were extracted for the ground state and isomeric state of At198 and 52(3) ms for the ground-state decay of Fr200. Furthermore, α-decay schemes for Fr202 and its daughter At198 could be constructed.4 MoreReceived 3 June 2019DOI:https://doi.org/10.1103/PhysRevC.100.054310Published 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 AreasAlpha decayLifetimes & widthsProperties190 ≤ A ≤ 219Accelerators & BeamsNuclear Physics" @default.
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• W2990273433 date "2019-11-07" @default.
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• W2990273433 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>α</mml:mi></mml:math> -decay properties of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:mi>Fr</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>200</mml:mn><mml:mo>,</mml:mo><mml:mn>202</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>" @default.
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• W2990273433 doi "https://doi.org/10.1103/physrevc.100.054310" @default.
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