3.14-hr ISOMERIC LEVEL IN Y$sup 9$$sup 0$

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.123.903· OSTI ID:4843936

Heath, R L; Cline, J E; Reich, C W; Yates, E C; Turk, E H

s produced in Y/sup 90/ by thermal neutron irradiation of Y/sup 89/. The thermal capture cross section for the production of the isomer was measured to be 1.0 plus or minus 0.2 mb. The decay of the isomeric level is characterized by the emission of two cascade gamma rays of 0.482 and 0.203 Mev. Conversion coefficient measurements indicated that the isomeric level at 0.685- Mev decays by M4 or E5 radiation to an intermediate level at 0.203 Mev followed by a predominantly M1 transition to the ground state of Y/sup 90/. Gamma-gamma directional correlation measurements and internal conversion measurements indicated that the level at 0.203 Mev has spin 3 with odd parity and that the level at 0.685 Mev has spin 7 or 8 with even parity. A shell-model configuration of (g/sub 9/2/ d/sub 5// /sub 2/) was assigned to the isomeric state. (auth)

• Research Organization: Phillips Petroleum Co., Idaho Falls, Idaho
• NSA Number: NSA-15-026964
• OSTI ID: 4843936
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 123; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
COINCIDENCE METHODS
CROSS SECTIONS
DIPOLES
ELECTRIC FIELDS
ENERGY
ENERGY LEVELS
EV RANGE
GAMMA RADIATION
HALF- LIFE
INTERNAL CONVERSION
ISOMERS
MEASURED VALUES
MULTIPOLARITY
MULTIPOLE RADIATION
PARITY
PHYSICS
RADIATIONS
SPIN
TRANSIENTS
YTTRIUM 89
YTTRIUM 90