A short‐lived iodine which was discovered by Strassmann and Hahn as a U fission product was shown to have a half‐life of 86±1 seconds. It emits 6.5‐Mev beta‐rays and 2.9‐Mev gamma‐rays. The fission yields in U235, Pu239, and U233are 3.1 percent, 1.9 percent, and 1.7 percent, respectively. A mass assignment to 136 has been shown to be the most likely one. The observed 86‐sec. I activity does not originate from a Te parent whose half‐life is greater than 20 seconds.
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