RADIOACTIVITY OF $sup 178$Ta, $sup 179$Ta AND $sup 180$Ta
The neutron deficient isotopes Ta/sup 178/, Ta/sup 179/, and Ta/sup 180 have been produced by phoWdisintegration of Ta/sup 181/ and studied with scintillation spectrometers used singly and in coincidence. The identification of each isotope is based on a knowledge of the ( gamma ,n) threshold and an appropriate choice of bremsstrahlung energies. Radioactive Ta/sup 178/ is shown to comprise an isometric doublet with half lives 9.5 plus or minus 0.1 min and 150 plus or minus 10 min. The 9.5 min activity populates levels in Hf/sup 178/ at 0, 91, and possibly 1480 kev, the first two by both electron capture and BETA /sup +/ emission and the last by electron capture, while the 150 min activity decays by electron capture to a level of Hf/sup 178/ at 1046 kev. A decay scheme is proposed based on the experimental results and the strong coupling collective model of Bohr and Mottelson. Evidence is presented to support the recent contention that Ta/sup 179/ decays by electron capture to the ground staff of Hf/ sup 179/. The observed gamma radiation from 8.15 hour Ta/sup 180/ is in general agreement with the decay scheme of Brown et al, except that there is no evidence for gamma radiation in the energy range 175 to 450 kev. (auth)
- Research Organization:
- Australian National Univ., Canberra
- NSA Number:
- NSA-12-009384
- OSTI ID:
- 4346497
- Journal Information:
- Proc. Phys. Soc. (London), Journal Name: Proc. Phys. Soc. (London) Vol. Vol: 71
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
BREMSSTRAHLUNG
CAPTURE
COINCIDENCE METHODS
DECAY
ELECTRONS
ENERGY
ENERGY LEVELS
GAMMA RADIATION
HAFNIUM 178
HAFNIUM 179
HALF-LIFE
ISOMERS
MEASURED VALUES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
PHOTOFISSION
PHYSICS
POSITRONS
RADIOACTIVITY
SCINTILLATION COUNTERS
TANTALUM 178
TANTALUM 179
TANTALUM 180
TANTALUM 181