Abstract
Thorium-217 was produced by the reaction Er-170 (Ti-50, xn) Th220-x. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-gamma-alpha-gamma). The evaluated decay data for the Th-217 nuclide resulted from the above interaction is presented in this report. Three delayed gamma-transitions (309, 673 and 1269 keV) have been measured from the ER-gamma(-gamma)-alpha correlations and gamma-gamma coincidences. They were assigned to Th-217, based on the level systematics of the N = 1 2 7 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 mu)s, respectively. In addition, an isomeric state (2 2 5 2 + x) keV is presented in the 2 1 7 Th decay scheme between the 2252 (21/2 +) and 2362 (25/2 +) keV. Q (alpha) 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.