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Decay of /sup 143/Gd/sup m+g/ by positron emission and electron capture

Journal Article · · Phys. Rev., C; (United States)
; ; ;

In the study the decay of /sup 143/Gd/sup g+m/ by positron emission and electron capture and the isomeric decay of /sup 143/Eu/sup m/ were investigated. ..gamma.. rays associated with /sup 143/Gd/sup g+m/ were placed on the basis of excitation functions, half-life, and ..gamma..-..gamma.. coincidence information. We assigned 61 ..gamma.. rays deexciting 33 levels in /sup 143/Eu from the decay of 112 +- 2 sec /sup 143/Gd/sup m/. Another 7 ..gamma.. rays deexcite an additional 6 levels in /sup 143/Eu from 39 +- 2 sec /sup 143/Gd/sup g/ decay. A small delayed p or ..cap alpha.. branch associated with /sup 143/Gd decay was observed with an upper limit of 1 x 10/sup -5/. The half-life of the /sup 143/Eu/sup m/ isomer at 389.47 keV was found to be 50.0 +- 0.5 ..mu..sec. The resulting level structure observed in /sup 143/Eu is explained quite satisfactorily in terms of a triaxial weak-coupling model.

Research Organization:
Department of Chemistry, Cyclotron Laboratory, and Department of Physics
OSTI ID:
7276134
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:2; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651722* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
651723 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DECAY
ELECTRON CAPTURE DECAY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EUROPIUM 143
EUROPIUM ISOTOPES
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
FT VALUE
GADOLINIUM 143
GADOLINIUM ISOTOPES
GAMMA SPECTRA
HALF-LIFE
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITIONS
ISOTOPES
LEPTONIC DECAY
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
ODD-EVEN NUCLEI
PARITY
PARTICLE DECAY
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTRA
SPIN
WEAK INTERACTIONS
WEAK PARTICLE DECAY
WEAK-COUPLING MODEL