Dy$sup 155$ AND Dy$sup 157$ DECAY SCHEMES
The disintegration schemes of Dy/sup 157/ and Dy/sup 157/ were s tudied. In addition to obtaining conversion-electron and gamma -ray spectra, e - gamma coincidence measurements were made. The Dy/sup 157/ results were conclusive and support the decay scheme proposed by Michelich, Harmatz, and Handley on the basis of differences and sums of accurately determined transition energies. The level in Tb/sup 157/ at 327-kev is shown to be 5/2-. The relative intensities of the three E1 gamma -rays proceeding from this level to the three members of a ground rotational band based on a spin of 3/2+ were found to agree with the corresponding branching ratios found for the analogous case in Tb/sup 159/ involving a 5/2 - 364-kev level and a ground rotational band again with a 3/2+ base state. In both instances the experimental intensities disagreed with the theoretical branching ratios. The Dy/sup 155/ coincidence results were inconclusive due chiefly to the presence of interfering activities. However, the Dy/sup 155/ data do corroborate some features of a disintegration scheme proposed by Toth and Rasmussen for this isotope ard based on accurately measured transition energies. Also a new level in Tb/sup 155/ at approximately 880 kev was established in the course of this investigation. (auth)
- Research Organization:
- Univ. of Copenhagen
- NSA Number:
- NSA-15-010047
- OSTI ID:
- 4094486
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 22
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
BETA DETECTION
BETA SPECTROMETERS
BRANCHING RATIO
COINCIDENCE METHODS
DECAY
DIPOLES
DYSPROSIUM 155
DYSPROSIUM 157
EFFICIENCY
ELECTRIC MOMENTS
ENERGY LEVELS
GAMMA DETECTION
GAMMA RADIATION
GAMMA SPECTROMETERS
INTERNAL CONVERSION
MEASURED VALUES
NUCLEAR MODELS
NUCLEAR THEORY
PARITY
PHYSICS
ROTATION
SPECTRA
SPIN
TERBIUM 155
TERBIUM 157
TERBIUM 159
TRANSIENTS
BETA SPECTROMETERS
BRANCHING RATIO
COINCIDENCE METHODS
DECAY
DIPOLES
DYSPROSIUM 155
DYSPROSIUM 157
EFFICIENCY
ELECTRIC MOMENTS
ENERGY LEVELS
GAMMA DETECTION
GAMMA RADIATION
GAMMA SPECTROMETERS
INTERNAL CONVERSION
MEASURED VALUES
NUCLEAR MODELS
NUCLEAR THEORY
PARITY
PHYSICS
ROTATION
SPECTRA
SPIN
TERBIUM 155
TERBIUM 157
TERBIUM 159
TRANSIENTS