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Nuclear Data Evaluation for ²¹⁷Th

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EN
Thorium-217 was produced by the reaction ¹⁷⁰Er (⁵⁰Ti, xn) ^{220-x}Th. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-γ-α-γ). The evaluated decay data for the ²¹⁷Th nuclide resulted from the above interaction is presented in this report. Three delayed γ-transitions (309, 673 and 1269 keV) have been measured from the ER-γ(-γ)-α correlations and γ-γ coincidences. They were assigned to ²¹⁷Th, based on the level systematics of the N=127 isotones. The evaluated half-lives T_{1/2} for these levels were assigned to be 64-₂₂⁺⁶⁴, 69-₁₇⁺³² and 66-₁₅⁺²⁷ μs, respectively. In addition, an isomeric state (2252+x) keV is presented in the ²¹⁷Th decay scheme between the 2252 (21/2+) and 2362 (25/2+) keV. Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been calculated using BrIcc code v2.3.
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Contributors
author
  • King Abdulaziz University, Faculty of Science, Physics Department, 20589 Jeddah, Saudi Arabia
  • Alexandria University, Faculty of Science, Physics Department, 21121 Alexandria, Egypt
author
  • King Abdulaziz University, Deanship for Post Graduate Studies, 20589 Jeddah, Saudi Arabia
author
  • King Abdulaziz University, Faculty of Science, Physics Department, 20589 Jeddah, Saudi Arabia
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Document Type
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bwmeta1.element.bwnjournal-article-appv129n4065kz
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