Spectrometer studies of the radiations of neutron deficient isotopes of cesium and of the E3 isomers, Xe127m and Xe125m

Mathur, Hirday B. ; Hyde, Earl K. (1954) Spectrometer studies of the radiations of neutron deficient isotopes of cesium and of the E3 isomers, Xe127m and Xe125m Physical Review, 95 . pp. 708-716. ISSN 0031-899X

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Official URL: http://link.aps.org/doi/10.1103/PhysRev.95.708

Related URL: http://dx.doi.org/10.1103/PhysRev.95.708

Abstract

Cesium isotopes produced by I127(α, xn) type reactions in the 60-inch and 184-inch cyclotrons were studied in Geiger counters, a mass spectrometer, beta-ray spectrometers, a sodium iodide crystal scintillation spectrometer, and a gamma-gamma coincidence spectrometer. The mass assignment of 30-minute Cs130 was verified. The 6.25-hour Cs127 was shown to decay predominantly by electron capture but also by the emission of positrons of 1.063-Mev and 0.685-Mev energy. Prominent gamma rays of 125 and 406 kev are observed. Cs127 exhibits branching decay to 75-second Xe127m in about one disintegration in 104. This isomer was isolated and studied in a scintillation spectrometer. E3 radiation of 175 kev connecting h11/2 and d5/2 levels is followed by 125-kev M1 radiation corresponding to a d5/2-d3/2 transition to the ground state. Forty-five minute Cs125 is shown to decay predominantly by electron capture and also by the emission of positrons of 2.05-Mev energy. Other lower energy positron groups are present. A prominent gamma ray of 112 kev is observed. In one disintegration in about 103, Cs125 decays to a 55-second Xe125m. This isomer emits gamma rays of 75 and 110 kev which are believed to be E3 h11/2-d5/2 and M1 d5/2-d3/2 transitions, respectively. An incomplete study of Cs123 shows it to be a 6-minute positron emitter.

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