Isomeric Transition inPb205
- 15 May 1960
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 118 (4), 1076-1080
- https://doi.org/10.1103/physrev.118.1076
Abstract
A (26±1)-kev transition in occurring in the electron capture decay of has been identified from its , , and internal conversion electrons measured in an intermediate-image beta-ray spectrometer. By using NaI scintillation detectors behind the source in the spectrometer the and lines of the 26-kev transition are found to be not in coincidence with electron-capture x rays but they are in coincidence with a principal gamma ray of 1 Mev and weak components of ∼0.7 and ∼0.3 Mev. Since the gamma rays of 987.8 and 284.2 kev and a fraction of the 703.3-kev gamma rays have been shown by Vegors and Heath to be delayed with respect to electron-capture x rays with a half-life of 4.8 msec, the present coincidence results indicate that the delayed radiation is associated with the 26-kev transition originating from an isomeric state in at 1013.8 kev. The 26-kev transition is probably a quadrupole and a possible assignment is if the spin-parity assignment of the 987.8-kev level is and if the 1013.8-kev level is the state predicted at 1.1 Mev by Pryce. The possibility that all or part of the known 1014.2-kev gamma radiation constitutes the "missing" transition in is discussed.
Keywords
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