Abstract
An external neutron beam from the Rossendorf Research Reactor was periodically interrupted by steel rotor. By placing a sample in the modulated neutron beam it was possible to observe short-lived isomeric states produced by thermal neutron capture. The spectra of the delayed γ-radiation were measured with a scintillation spectrometer. In this way a number of isomeric transitions were found and their half-lives were obtained by means of a 5 channel time analyser. The energies and half-lives of the following isomers were measured: Na 24m(475±10 keV, 20±1 msec); Ga m(99±5 keV, 38±2 msec); In 116m(160±8 keV, 2460±80 msec); Ho 166m(131±5 keV, 0.214±0.010 msec). The newly discovered Ho 166m has a K-conversion coefficient of about 0.4. Therefore the transition is probably of the type E2.
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