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RADIOACTIVE DECAY OF LUTETIUM 173

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
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Ytterbium oxide enriched to 92.6% in the 173 mass number was irradiated with 6-Mev protons. An activity with a half-life of 625 plus or minus 50 days was produced and its assignment to Lu/sup 173/ confirmed by the identification of the ytterbium K x ray, gamma rays corresponding to transitions among the energy levels established in Yb/sup 173/ by Coulomb excitation of the separated isotope, and the activities produced by the similar proton irradiations of the other enriched isotopes of ytterbium. The observed activity of Lu/sup 173/ consists of the L and K x-rays of ytterbium and gamma rays with energies of79 plus or minus 1.101 plus or minus 1.172 plus or minus 2.273 plus or minus 2,349 plus or minus 4, approximately 450,aand 630 plus or minus 4 kev and two other gamma rays not resolved in the gamma-ray spectrum but observed in gamma-gamma coincidence measurements. These two gamma rays have energies of approximately 179 and 282 kev. Because no positron radiation exists in the activity of Lu/sup 173/, the mode of decay ts solely by electron capture to Yb/sup 173/. Gammagamma coincidence measurements lead to the assignment of a 633-kev level with a probable spin of 5/2+ and the confirmation of a 351-kev level in Yb/sup 173/ in addition to the previously known 179.5- and 78.7-kevlevels. The disintegrations of Lu/sup 173/ to the 633-kev level are by L capture only. Branching ratios for the electron capture transitions of Lu/sup 173/ to the levels of Yb/sup 173/ and approximate relative probabilities for the transitions in Yb/sup 173/ are given in a proposed energylevel scheme for the decay of Lu/sup 173/. The choice of 9/2- for the ground-state spin of Lu/sup 173/ is the most consistent with the proposed energy level scheme. (auth)

Research Organization:
Ohio State Univ., Columbus
NSA Number:
NSA-14-012233
OSTI ID:
4176925
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 117; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

BRANCHING RATIO
CAPTURE
COINCIDENCE METHODS
COULOMB EXCITATION
DECAY
ELECTRONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENRICHMENT
EXCITATION
GAMMA RADIATION
HALF-LIFE
IRRADIATION
ISOTOPES
LUTETIUM 173
MASS
MEASURED VALUES
PARITY
PHYSICS
PRODUCTION
PROTON BEAMS
RADIOACTIVITY
RESOLUTION
SPECTRA
SPIN
X RADIATION
YTTERBIUM OXIDES