Abstract
Cesium isotopes produced by 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 was verified. The 6.25-hour 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. exhibits branching decay to 75-second in about one disintegration in . This isomer was isolated and studied in a scintillation spectrometer. radiation of 175 kev connecting and levels is followed by 125-kev radiation corresponding to a transition to the ground state. Forty-five minute 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 , decays to a 55-second . This isomer emits gamma rays of 75 and 110 kev which are believed to be and transitions, respectively. An incomplete study of shows it to be a 6-minute positron emitter.
- Received 4 February 1954
DOI:https://doi.org/10.1103/PhysRev.95.708
©1954 American Physical Society