Abstract
A 5.3 sec isomer of W183 has been chemically separated from its parent 5.2 d Ta183. The radiations from the isomer have been observed with a xenon proportional counter and a NaI scintillation crystal and have energies of 46, 52, ≈ 105and≈ 160 keV. Gamma-gamma coincidence measurements involving the photons have been made. On the basis of these results and previously reported high resolution measurements of the decays of Ta183 and Re183, the energy of the isometric level is assigned as 309.49 keV, and its spin and parity as 9/2+.
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