LOW-INTENSITY CONVERSION LINES FROM Sm$sup 151$ AND Sn$sup 11$$sup 3$

Journal Article · Wed Apr 01 04:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys.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.114.137· OSTI ID:4251617

Achor, W T; Phillips, W E; Hopkins, J I; Haynes, S K

The electron spectrum of Sm/sup 151/ has been measured with a lens spectrometer and its gamma-ray spectrum with a scintillation spectrometer. The L- conversion coefficient of the 21.7 plus or minus 0.3 kev de-excitation of the first excited state of Eu/sup 151/ is 20 plus or minus 4, with ( alpha /sub L// alpha /sub M+N/) = 2.2 plus or minus 0.4 and alpha /sub M// alpha /sub N/ = 2.2 plus or minus 0.2 indicating M1 multipolarity. The low intensity of the conversion electrons relative to the continuous beta spectrum of end point 75.9 plus or minus 0.6 kev implies the existence of a weak beta transition whose and point is 54.2 plus or minus 0.7 kev. The beta branching ratio, 54.2-kev beta transitions/75. 9-kev beta transitions, is 1.7/100. Log/sub 10/ft values for the two beta decays are 7.6 plus or minus 0.2 for the 75.9-kev decay and 8.8 plus or minus 0.2 for ths 54.2-kev decay. A partial analysis of the decay in terms of the Nilsson-Gottfried scheme hss been made, but no definitive sssignment for the 21.7-kev state appears to be possible. Measurements of the electron spectrum of Sn/sup 113/ with the lens spectrometer reveal the eastence of a weak conversion line corresponding to a transition of 253 kev. The intensity of this conversion line is (2.8 plus or minus 1.0) x 10/sup -3/ of the intensity of the conversion line from the 392-kev transition, This relative conversion electron intensity indicates that the 253-kev transition leads to the 392-kev state of In/ sup 113/ implying the eastence of an excited state at 645 kev. The existing uncertainty in the relative gamma-ray intensities for the two transitions makes it impossible to assign spin and parity to the 645-kev state; the decay scheme presented is therefore incomplete. (auth)

• Research Organization: Vanderbilt Univ., Nashville; Western Reserve Univ., Cleveland
• NSA Number: NSA-13-016472
• OSTI ID: 4251617
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 114; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMIC MODELS
BETA DECAY
BETA SPECTROMETERS
BRANCHING RATIO
DECAY
ELECTRONS
ENERGY LEVELS
ENERGY RANGE
EUROPIUM 151
EXCITATION
GAMMA RADIATION
GAMMA SPECTROMETERS
HALF-LIFE
INDIUM 113
INTERNAL CONVERSION
MEASURED VALUES
MULTIPOLES
NILSSON-MOTTELSON MODEL
PHYSICS AND MATHEMATICS
SAMARIUM 151
SCINTILLATION COUNTERS
SPECTRA
TIN 113
TRANSIENTS