GAMMA-RAY ANGULAR CORRELATIONS AND SPIN ASSIGNMENTS IN Sm$sup 14$$sup 9$

Journal Article · Tue Oct 15 04:00:00 EDT 1963 · Physical Review (U.S.) Superseded in part by Phys.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.132.807· OSTI ID:4637889

Harling, O K; Ventrice, C A; Pinajian, J J

Levels in Sm/sup 149/, following electron-capture decay from Eu/sup 149/ , occur at 22.5, 277, 350, 529, and 558 kev. Experimentally determined coefficients of the correlation function are A/sub 2/ =-0.398 plus or minus 0.040, A/sub 4/ = 0.122 plus or minus 0.024; A/sub 2/ = --0.139 PP 0.018, A/sub 4/ = 0.218 plus or minus 0.065; and A/sub 2/ = 0.147 plus or minus 0.022. A/ sub 4/ = -0.257 plus or minus 0.080, respectively, for the following gamma cascades: 180--328, 281-277, and 73-277 kev. Assuming a mixture of dipole and quadrupole radiation for all of the cascading gamma rays, the theoretical coefficients were calculated and compared with the experimental results. Spin assignments for the excited states in Sm/sup 149/, which are consistent with the experimental results, are 7/2 (22.5 kev), 9/2 (277 kev), 9/2 (350 kev), 7/2 or 11/ 2 (529 kev), and 7/2 (558 kev). The quadrupole-dipole mixing was determined for the cascading gamma rays. The half-life of the isotope associated with the 281- - 277-kev coincidence was measured in order to reduce the uncertainty of assigning the 281-kev gamma ray. (auth)

• Research Organization: General Electric Co., Richland, Wash.
• NSA Number: NSA-17-040109
• OSTI ID: 4637889
• Report Number(s): HW-SA-3058; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 132; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
CAPTURE
COINCIDENCE METHODS
DECAY
DIPOLES
ELECTRONS
ENERGY LEVELS
EUROPIUM 149
GAMMA RADIATION
HALF-LIFE
ISOTOPES
MEASURED VALUES
MIXING
NUCLEAR MODELS
NUMERICALS
PHYSICS
QUADRUPOLES
RADIATIONS
SAMARIUM 149
SCATTERING
SPIN