RADIOACTIVE DECAY OF Lu$sup 17$$sup 2$
Ytterbium oxide enriched to 95.9% in mass number 172 was irradiated with 6-Mev protons, An activity decaying by electron capture with a half-life of (6.70 plus or minus 0.04) days was produced and its assignment to Lu/sup 172/ confirmed by the identification of the ytterbium K x ray and by comparison with the activities produced by similar proton irradiations of ihe other enriched isotopes of ytterbium. The 4.0-hour positron activity previously assigned to Lu/ sup 172/ was not observed and is best attributed to an impurity. The observed activiaty of Lu/sup 172 coi;sists of the L and K x rays of ytterbium and gamma rays with energies of 79, 91, 113, 162,203, 270, kev. Because no positron radiation exists in the activity of Lu/sup 172/, the mode of decay Is solely by electron capture to Yb/sup 172/. Gamma-gamma coincidence measurements, energy considerations, and consideration of ihe relative numbers of the radlations obserwed in the activity of Lu/sup 172/ have led to the asslgnment of energy levels at 530 (6+), 1172 (3+), in Yb/sup 172/ In addition to the prevlously known 78.7 (2+)- and radiations ard some obserwed only in conversion electron measurements are shown in a proposed energy level scheme for the decay of Lu/sup 172/. Approximate branching ratios for the electron capture disintegrations of Lu/sup 172/ are also shown in the level scheme. Few, if any, electron capture transitions of Lu/sup 172/ occur to the ground and first excited states of Yb/sup 172/. Of the two predicted spins for the ground state of Lu/sup 172/, 4-is more consistent with the proposed energy level scheme. (auth)
- Research Organization:
- Ohio State Univ., Columbus
- NSA Number:
- NSA-14-016319
- OSTI ID:
- 4164564
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 118; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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BETA DECAY
BRANCHING RATIO
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COINCIDENCE METHODS
DECAY
ELECTRONS
ENERGY LEVELS
ENERGY RANGE
ENRICHMENT
GAMMA DETECTION
GAMMA RADIATION
HALF-LIFE
INTERNAL CONVERSION
IRRADIATION
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MEASURED VALUES
MEV RANGE
NUCLEAR REACTIONS
PARITY
PHYSICS
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PROTON BEAMS
RADIOACTIVITY
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X RADIATION
YTTERBIUM 172
YTTERBIUM OXIDES