RADIOACTIVE DECAY OF Tm$sup 164$ AND Tm$sup 16$$sup 2$
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Erbium oxide enriched to 35.1% and 14.1% in the mass numbers l64 aQd 162, respectively, were irradiated with 6-Mev protons. Activities decaying by electron capture with half lives of (2.04 plus or minus 0.10) minutes and (77 plus or minus 4) minutes were produced and were assigned to Tm/sup 164/ and Tm/ sup 162/, respectively, by the identification of the erbium K x ray, comparison with the activities produced by similar proton irradiations of each of the other enriched isotopes of erbium, and by the existence in the 2.04-minute activity of a promainent gamma ray with the energy of the first excited level in Er/sup 164/ determined from the decay of Ho/sup 164/. The gamma -ray spectrum of Tm/sup 164/ consists of only the erbium K x ray, a gamma ray of 9l kev, and anninilation radiation; and that of Tm/sup 162/, of the erbium K x xay and gamma rays of l02 and 236 kev. The three radiations observed in the decay of Tm/sup 162/ are all in coincidence. Energy level schemes for the decay of these two new activities are proposed and branching ratios are estimated from relative intensities. (auth)
- Research Organization:
- Ohio State Univ., Columbus
- NSA Number:
- NSA-15-005714
- OSTI ID:
- 4083263
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 120; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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