Furthermore it was found that Rb 91 has an isomeric state. Both these states of Rb 91 (half-lives 100 sec and 14 min, respectively) decay to the well-known Sr 91 9.7 hr which again decays to the 60-day and the 50-min isomers of Y 91 . All these radioactivities were found in the samples of mass number 91.A more detailed account of the experiments will be published elsewhere. 2 We wish to thank Professor N. Bohr for his interest taken in our work and Dr. J. Koch for help and advice during this investigation.1 O. Kofoed-Hansen and P. Kristensen, Kgl. Danske Videnskab. Selskab Mat.-fys. Medd. (to be published); see also Phys. Rev., preceding letter.
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