THE ONCE-FORBIDDEN BETA SPECTRUM OF Tl$sup 20$$sup 6$
The beta spectrum of Tl/sup 206/ was measured in a 4 pi scintillation spectrometer. The Tl/sup 206/ beta decay is a O/sup -/ yields O/sup +/ transition. The spectrum was found to have a nonstatistical shape. The shape of the spectrum was analyzed successfully in terms of the pseudovector interaction and no necessity for the inclusion of pseudoscalar contribution was found. Because of the short half life of Tl/sup 206/ (4.2 min.), the beta spectrum of Tl/ sup 206/ was measured using T1/sup 206/ in secular equilibrium with Bi/sup 210m/. Bi/sup 210m/, an excited state located at 268 kev, alpha decays to Tl/sup 206/ with a half-life of 2.6 x 10/sup 6/ years. The source material has to be spread over a large area in order to make a thin source. A large area scintillation spectrometer was constructed. On the basis of the V-A interaction in beta decay, a shape factor was calculated for O/sup -/ yields O/sup +/ transitions. Only the pseudovector coupling can contribute. (Dissertation Abstr.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-038165
- OSTI ID:
- 4635334
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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