Abstract
Tl197m was produced by the (α, 4n) reaction on Au197 using 49 MeVα particles. The following results were obtained: Half-lifeT 1/2=(0.55±0.02) sec; energy of the isomeric level (607±4) keV, determined directly by summing up the cascade transitions in a well-type scintillator; energy of the isomeric transition (222±2) keV; conversion coefficients of this transitionα K222=0.41±0.05 andα tot222=2.1±0.2, indicating anE3 multipolarity; energy of the second transition (385±3)keV; conversion coefficientsα K385=0.09±0.03 andα tot385<0.1. This transition was identified asE2 with aM1 admixture of 20 to 30%. Spins and parities are 1/2+, 3/2+ and 9/2− for the ground state, the 385 keV state and the 607 keV isomeric state, respectively, in disagreement with the extreme single-particle model. If this model were correct, anotherM1 transition should appear. No furtherM1 transition having an energy greater than theL-shell binding energy of T1 was observed.
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Dem Bundesministerium für wissenschaftliche Forschung und dem Niedersächsischen Kultusministerium gebührt Dank für zusätzliche Mittel.
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Schmidt-Ott, W.D., Smend, F., Weirauch, W. et al. Zur Isomerie des Tl197 . Z. Physik 188, 282–289 (1965). https://doi.org/10.1007/BF01325938
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DOI: https://doi.org/10.1007/BF01325938