Abstract
Samples of Dy/sup 166/ were produced by successive neutron capture in stable Dy/sup 164/. This isotope decays by beta-ray emission with an 80.2-hr half-life to states in Ho/sup 166/. This isotopic assignment of previous authors is confirmed. Separations of the parent and daughter activities were carried out by use of an ion-exchange column. Scintillation studies were made with a 256-channel scintillation coincidence spectrometer. Internal-conversion electrons were measured in magnetic spectrographs with permanent magnets and the continuous beta spectra were observed with a 180 deg magnetic spectrometer with a variable field. The seven gamma-ray transitions observed had energies of branches of 481 and 402 kev were observed with the magnetic spectrometer; two others of 114 and 56 kev are postulated for the decay scheme. The decay scheme presented indicates the existence of five levels in Ho/sup 166/ at 0(0/sup -/), 54(2/sup -/), 82(1/sup -/), 370, and 428(1/sup +/) kev. The ground state and first two excited states are interpreted as members of a rotational band with K = 0. This interpretation implies that in odd-odd nuclei the level sequence can be inverted for the first two excited states of such a band. (auth)
Published Version
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