Low Mass Francium and Emanation Isotopes of High AlphaStability
Description:
Isotopes of francium with 126 or fewer neutrons have been looked for in bombardments of Th{sup 232} with 350 Mev protons from the 184-inch cyclotron. Fr{sup 212} with an apparent half-life of 19.3 minutes for branching decay by alpha emission (44%) to At{sup 208} and by orbital electron capture (56%) to Em{sup 212} has been found. Em{sup 212} is shown to be a 23-minute alpha-emitter. At{sup 208} decays primarily (99.5%) by orbital electron capture to Po{sup 208}, but shows 0.5% alpha-branching.…
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Date:
October 10, 1949
Creator:
Hyde, E. K.; Ghiorso, A. & Seaborg, G. T.
Partner:
UNT Libraries Government Documents Department