Abstract
The low-lying level structure of81204Tl has been studied by means of the thermal-neutron capture reaction on203Tl. The γ-ray spectrum from this reaction was studied below 1.8 MeV with a Ge(Li) spectrometer. Owing to the great complexity of the decay scheme γ-γ coincidence measurements using two Ge(Li) detectors were made. Spin and parity assignments for some of the lowest-lying levels are proposed. The level energy values are 140.6, 300.0, 318.4, 432.3 471.6, 488.2, 535.9, 628.3, 736.7, 1013.6, 1051.9, 1250.7, 1474.3 and 1741.1 keV. The agreement of the present results with a recent calculation of the low-energy spectra of odd-odd thallium isotopes seems satisfactory, at least for what concerns the first excited levels.
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