Elsevier

Nuclear Physics

Volume 15, February–March 1960, Pages 108-124
Nuclear Physics

Low mass odd-odd isomers of thallium

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Abstract

β-spectrometer measurements on mass separated sources from synchrocyclotron bombardments of Hg and Tl with protons have yielded information about some previously unknown nucleides: (1.41±0.02)h Tl196m, (11±2)min Pb194, (32.8±0.2)min Tl194m, and (33.0±0.5)min Tl194. Reinvestigation of the internal branch of (1.87±0.03)h Tl198m has shown that it is more complex than assumed earlier, suggesting the following level sequence: 7+ (544 keV), 3− (283 keV), 2− (260 keV), and 2− (ground state). In Tl196 an analogous pattern is indicated: 7+ (395 keV), 3− (275 keV), 2− (241 keV), and 2− (ground state). No internal branch has been found from Tl194m, while about 4 % I.T. can be calculated for Tl196m and about 55% I.T. for Tl198m. Some systematic energy level trends are discussed.

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    The work has been financially supported by the Swedish Atomic Energy Commission.

    We are indebted to Professor The Svedberg for stimulating working conditions, to Fil. Mag. I. B. Svensson for chemical separations, to Ing. R. Ringh for mass separations, and to Ing. Å. Svanheden and his synchrocyclotron crew for irradiations.

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