LIFETIMES OF THE 22-kev FIRST EXCITED STATES IN Eu$sup 151$ AND Sm$sup 14$$sup 9$

Journal Article · Fri Nov 15 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4153027

Kistner, O C; Li, A C; Monaro, S

Lifetimes of the first excited states in Eu/sup 151/ and Sm/sup 149/ were measured using the delayed coincidence technique. The half lives obtained are (9.3 plus or minus 0.7) x 10/sup -9 / and (7.6 plus or minus 0. plus or minus ) x 10/sup -9/ sec for Eu/sup 151/ and Sm/sup 149/, respectively, which are in agreement with the lower limits determined previously by Mossbauer experiments. The two transitions, which are predominantly M1, are retarded by factors of 127 and 150 relative to Weisskopf estimates. The E2 speed of the 22kev transition in Sm/sup 149/ is also inferred from the known E2/M1 ratio and is found to be 83 times the single-particle speed. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-18-001064
• OSTI ID: 4153027
• Report Number(s): BNL-7124; 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• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: United States
• Language: English

Related Subjects

COINCIDENCE METHODS
ENERGY LEVELS
EUROPIUM 151
EXCITATION
HALF-LIFE
LIFETIME
MEASURED VALUES
MOESSBAUER EFFECT
NUCLEAR MODELS
PHYSICS
SAMARIUM 149
SINGLE-PARTICLE MODEL
TRANSIENTS