NUCLEAR RESONANCE FLUORESCENCE IN Cu$sup 63$: LIFETIMES OF EXCITED STATES AND THE SLOWING DOWN OF RECOILS (3-100 ev) IN CONDENSED MEDIA

Journal Article · Thu Dec 15 04:00:00 EST 1960 · Physical Review (U.S.) Superseded in part by Phys.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:4120867

Cumming, J B; Schwarzschild, A; Sunyar, A W; Porile, N T

Measurements of the lifetimes of the 669- and 963-kev states of Cu/sup 63/ were made using the nuclear resonance fluorescence technique. Self- absorption experiments yielded mean lives of (2.94 plus or minus 0.24) x 10/sup -1/3 sec for the spin 1/2 669-kev level and (7.2 plus or minus 1.8) x 10/sup - 13/ sec for the spin 5/2 963-kev level. The resonance yields from sources inside copper metal and in water solution were measured. The reduction of the resonance yields due to slowing down of the recoils from the beta /sup +/ decay was calculated with the use of the model of Vineyard et al., for the solid and with an elastic collision model for the liquid environments. These calculations are in good agreement with the measured yields and result in a unique spin assignment to the 669-kev state. The effect of the scatterer temperature on the resonance yield was shown to be in agreement with the "effective temperature" predicted by the theory of Lamb. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-15-006831
• OSTI ID: 4120867
• Report Number(s): BNL-4922; 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• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
BETA DECAY
COPPER 63
CRYSTALS
EFFICIENCY
ENERGY LEVELS
EXCITATION
FLUORESCENCE
LAMB SHIFT
LAMB THEORY
LIFETIME
LIQUIDS
MEASURED VALUES
METALS
NEUTRONS
NUCLEI
NUMERICALS
PHYSICS
POSITRONS
RECOILS
RESONANCE
SLOWDOWN
SOLIDS
SOLUTIONS
WATER