DECAY OF Tl$sup 210$ TO STATES OF Pb$sup 21$$sup 0$
The decay of /sup 210/Tl sources was investigated by means of scintillation and semiconductor spectrometers. BETA - gamma , gamma - gamma , and gamma -sum-coincidence measurements were carried out. The BETA spectrum (from shell-model considerations presumably a first-forbidden transition) was decomposed into three components of 2.34 plus or minus 0.10, 1.87 plus or minus 0.10, and 1.32 plus or minus 0. 10 Mev. Twenty-four gamma lines were found decomposing the NaI(Tl) scintillation spectrum; six of them showed measurable conversion lines in the semiconductor spectrometer, and their transition type could be inferred. Measurements of the delay of different parts of the gamma spectrum with respect to the BETA rays revealed the existence of nt least three states of measurable half-life, 1.7 plus or minus 0.1, 1.1 plus or minus 0.1, and 0.6 plus or minus 0.1 nsec, the latter arising from the second excited state of 1.09 Mev. Calculations of the /sup 210/Pb levels were carried out, using a zero-range approximation for the interaction between the two extra neutrons and compared with the experimental level scheme. (auth)
- Research Organization:
- Inst. for Physics, SGAE, Seibersdorf, Austria and Universitat, Vienna
- NSA Number:
- NSA-18-019091
- OSTI ID:
- 4029601
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 134; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
$beta$ SPECTRA OF SHORT LIFE Al$sup 28$ AND F$sup 17$ ISOTOPES
ONCE-FORBIDDEN BETA SPECTRUM OF Tl$sup 20$$sup 6$