Nuclear decay scheme studies of some tantalum and terbium isotopes
- Univ. of California, Berkeley, CA (United States)
A previously unreported isotope of terbium Tb152 was produced. Its gamma-ray spectrum was studied and its half life- was determined to be 18.5 ± 0.5 hr. The similarity to the half lives of two neighboring isotopes, 19-hr Tb151 and l7-hr Tb156 explains why it was previously overlooked. The decay scheme of Th161 was studied and precise transition energies are reported. The lifetimes of two excited states were measured and used to resolve a question of transition sequence encountered by previous investigators. Three new isotopes of tantalum were discovered. They are 3.7-hr Ta173, l.2-hr Ta174;and ll-hr Tt175. Tantalum-175 was studied in detail and a decay scheme ls presented using eight of the transitions observed in conversion-electron studies. Four excited states are proposed, and Nilsson quantum numbers are assigned. Electron-sensitive nuclear track emulsions were used in conjunction with electron spectrographs, and the usefulness of the method of track counting is discussed.
- Research Organization:
- Univ. of California, Berkeley, CA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-13-015612
- OSTI ID:
- 4243959
- Report Number(s):
- UCRL--8664
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA SPECTROMETERS-- COLLECTIVE MODEL-- ENERGY LEVELS-- INTERNAL CONVERSION-- NILSSON-MOTTELSON MODEL-- NUCLEAR EMULSIONS-- NUCLEAR MODELS-- PARTICLE TRACKS-- QUANTUM MECHANICS-- TANTALUM 173-- TANTALUM 174-- TANTALUM 175
DECAY-- EXCITATION-- GAMMA RADIATION-- HALF-LIFE-- MEASURED VALUES-- TRANSIENTS
ENERGY-- SPECTRA-- TERBIUM 151-- TERBIUM 152-- TERBIUM 154-- TERBIUM 161
BETA SPECTROMETERS-- COLLECTIVE MODEL-- ENERGY LEVELS-- INTERNAL CONVERSION-- NILSSON-MOTTELSON MODEL-- NUCLEAR EMULSIONS-- NUCLEAR MODELS-- PARTICLE TRACKS-- QUANTUM MECHANICS-- TANTALUM 173-- TANTALUM 174-- TANTALUM 175
DECAY-- EXCITATION-- GAMMA RADIATION-- HALF-LIFE-- MEASURED VALUES-- TRANSIENTS
ENERGY-- SPECTRA-- TERBIUM 151-- TERBIUM 152-- TERBIUM 154-- TERBIUM 161