LEVELS IN Tb$sup 159$ POPULATED IN THE DECAY OF Gd$sup 15$$sup 9$
Journal Article
·
· Arkiv Fysik
OSTI ID:4082313
The beta decay of 18-hr Gd/sup 159/ was investigated with magnetic beta- ray spectrometers and by scintillation spectroscopy. The Gd/sup 159/ source was produced by neutron irradiation of gadolinlum enriched in the isotope Gd/sup 158/ to 97.6%. The internal conversion and gamma ray scintillation measurements were performed with a source produced by isotope separation after the activation. The gamma ray spectrum was also studied by the external conversion method. Gamma rays having the energies 348.0 plus or minus 0.4, 536 plus or minus 2, 557 plus or minus 2, 580 plus or minus 1, and 616 plus or minus 2 kev were observed in this decay. The relative intensities of these gamma rays were obtained from the photoelectron lines after correction for the angular dependence of the photoelectric process. In addition to the levels at 58.0, 137.5, and 363.2 kev previously known to be populated in the decay of Gd/sup 159/, levels in Tb/sup 159/ at 348.0, 580, 616, and 674 kev are suggested to be fed in this beta decay. M1 character is suggested for the 348-kev gamma ray from measured K conversion coefficient. The upper limit found for the K conversion coefficient of the 305-kev transition indicates E1 multipolarity. The log ft value obtained for the beta ray to the 348-kev level indicates a hindered, first forbidden transition in agreement with the 3/2/sup -/ STA521! assignment for the ground state of Gd/sup 159/ and the 5/2/sup +/ STA413! classification of the 348-kev level. The log ft values found for the beta decay to the 580-, 616-, and 674-kev levels are in agreement with the 1/2/sup +/, 3/2/sup +/, and 5/2/sup +/ assignments previously suggested from recently performed Coulomb excitation experiments on Tb/sup 159/. The possibility of gamma -vibrational character of these levels is discussed. (auth)
- Research Organization:
- Nobel Inst. of Physics, Stockholm and Universitat, Copenhagen
- NSA Number:
- NSA-18-015224
- OSTI ID:
- 4082313
- Journal Information:
- Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 25
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ACTIVATION
ANGULAR DISTRIBUTION
BETA DECAY
COULOMB EXCITATION
ELECTRONS
ENERGY LEVELS
ENRICHMENT
EXCITATION
GADOLINIUM 158
GADOLINIUM 159
GAMMA RADIATION
HALF-LIFE
INTERNAL CONVERSION
IRRADIATION
ISOTOPE SEPARATION
MAGNETIC FIELDS
MEASURED VALUES
MULTIPOLARITY
NEUTRON BEAMS
NUCLEAR MODELS
OSCILLATIONS
PARITY
PHOTOPRODUCTION
PHYSICS
RADIATION SOURCES
SCINTILLATION COUNTERS
SPECTRA
SPECTROMETERS
SPIN
TERBIUM 159
ANGULAR DISTRIBUTION
BETA DECAY
COULOMB EXCITATION
ELECTRONS
ENERGY LEVELS
ENRICHMENT
EXCITATION
GADOLINIUM 158
GADOLINIUM 159
GAMMA RADIATION
HALF-LIFE
INTERNAL CONVERSION
IRRADIATION
ISOTOPE SEPARATION
MAGNETIC FIELDS
MEASURED VALUES
MULTIPOLARITY
NEUTRON BEAMS
NUCLEAR MODELS
OSCILLATIONS
PARITY
PHOTOPRODUCTION
PHYSICS
RADIATION SOURCES
SCINTILLATION COUNTERS
SPECTRA
SPECTROMETERS
SPIN
TERBIUM 159