Abstract
The gamma ray spectra associated with the decay of the136I isomers have been measured by means of a Ge(Li) detector. The iodine samples were produced by using the technique of on-line isotope separation of the fission products of a235U target at the R2-O reactor in Studsvik, Sweden.
On the basis of the measured singles and Ge-Ge coincidence spectra a new level scheme was constructed for136Xe. A comparison with theoretical calculations is included.
The half-life analysis of the gamma peaks as well as the beta andK X-rays associated with mass 136 iodine showed that there exist three separate half-lives: 48 ± 2 s, 83 ± 3 s and 100 ± 3 s, the last one being not previously reported. The possibility of the existence of three isomeric states in136I is discussed.
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The author would like to express his grateful acknowledgement of the splendid experimental facilities of the Studsvik Research Center placed at his disposal by the Swedish Atomic Energy Company as well as the kind assistance and cooperation of the technical staff of the isotope separator laboratory. My warm thanks are due to Dr. G. Holm for organising the measurements and for several helpful discussions and to Prof. A. Siivola for his continuous encouragement and help in all phases of the work. Technical assistance of Mr. B. Rydberg is also gratefully acknowledged.
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Lundán, A. The decay of the136I isomers to the energy levels of136Xe. Z. Physik 242, 107–120 (1971). https://doi.org/10.1007/BF01394823
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DOI: https://doi.org/10.1007/BF01394823