Multipole mixing ratios of the 198 and 177 keV [gamma]-ray transitions in [sup 169]Tm

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.533· OSTI ID:5286487

Dey, C C; Sinha, B K ^[1]

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1. Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Calcutta-700 064 (India)

The multipole mixing ratios for the 198 and 177 keV [gamma]-ray transitions in [sup 169]Tm are determined as [delta](198)=[minus]6.1[sub [minus]0.6][sup +0.4] and [delta](177)=[minus]0.20[sub [minus]0.03][sup +0.04] from new measurements of angular correlation of the 63-198 and 63-177 keV cascades in addition to measurements on the cascades passing through the 118 and 139 keV levels. The present value of [delta](198) indicates an almost pure [ital E]2 character for the 198 keV [gamma] ray while from earlier measurements an admixture of only 9% [ital E]2 was reported for this [gamma] ray. For both the 198 and 177 keV transitions the results do not agree with the conversion electron measurements and indicate that the conversion processes in these transitions are not normal. From time-differential measurement on the 63-198 keV cascade, the relaxation constant [lambda][sub 2]=(0.31[plus minus]0.21)[times]10[sup 7] sec[sup [minus]1] is obtained using the source in acetic acid solution. The integral attenuation coefficients for the 316 keV level are found to be [ital G][sub 2]=0.19[plus minus]0.04 in liquid chloride source and [ital G][sub 2]=0.57[plus minus]0.06 in liquid acetate source.

• OSTI ID: 5286487
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663220* -- Electromagnetic Transitions-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
E2-TRANSITIONS
ENERGY-LEVEL TRANSITIONS
GAMMA SPECTRA
INTERMEDIATE MASS NUCLEI
ISOTOPES
MIXING RATIO
MULTIPOLE TRANSITIONS
MULTIPOLES
NUCLEI
ODD-EVEN NUCLEI
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTRA
STABLE ISOTOPES
THULIUM 169
THULIUM ISOTOPES