NUCLEAR SPECTROSCOPY OF MASS-SEPARATED NEUTRON-DEFICIENT TELLURIUM ISOTOPES
Journal Article
·
· Arkiv Fysik
OSTI ID:4016367
The radioactive decay of five neutron-deficient activities of tellurium from irradiations of Sb with 90-140 Mev protons was investigated with magnetic and scintillation spectrometers, beta proportional counter, and alpha ionization chamber using mass-separated sources. The electron spectra and the gamma scintillation singles and coincidence spectra were interpreted in the form of tentative disintegration schemes to account for the decay modes of Te/sup 116/ (2.50 plus or minus 0.02 hours), Te/sup 117/(6l plus or minus 2 minutes, measured spin 1/2), Te/sup 118/(6.OO plus or minus 0.02 days), and Te/sup 119/ isomers (15.9 plus or minus 0.3 hours, measured spin 1/2, and 4.5 plus or minus 0.3 days, measured spin 11/2). Two neutron-deficient Sb isotopes also were prepared by mass separation and their half lives confirmed: Sb/sup 115/(36 plus or minus 3 minutes) and Sb/sup 116/(64 plus or minus 4 minutes). Fro m NH/sub 4/I targets irradiated with 145-180 Mev protons, a new Te activity was found with half life about 5-6 minutes, which might be Te/sup 115/ or Te/sup 114/. A new carrier-free radiochemica l separation technique requiring about 30 seconds is reported for preparing Te sources from the irradiated NH/sub 4/I targets. No isomer in Te/sup 117/ having a half life greater than 15 minutes was detected, and in the case of the Te/sup 119/ isomers, no transitions corresponding to the internal branch could be found, the two isomers apparentiy decaying independently to levels in antimony. (auth)
- Research Organization:
- Univ. of Uppsala; Univ. of Helsinki
- NSA Number:
- NSA-15-025470
- OSTI ID:
- 4016367
- Journal Information:
- Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 19
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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