Search

The energy level schemes of192Os and192Pt have been established on the basis ofγ- γ coincidence studies using a dual parameter data collection system. Ge(Li) detectors were employed to study the gamma spectra produced in the E.C. andβ− decays of192Ir to192Os and192Pt, respectively. Thirteen new transitions and three new levels at 1,146.95, 1,237.35 and 1,913.76 keV are suggested. Relative intensities from singles measurements, branching ratios,α(K) and log ft values were calculated and multipolarities, spins and parities deduced. Comparisons are made with predictions of the Interacting Boson Model calculated on the basis of an O(6) to SU(3) transition.

The energy level scheme of182W has been established from γ — γ coincidence studies following the β decay of182Ta. A Dual Parameter Energy-Time spectrometer used a pair of Ge(Li) detectors and a plastic scintillation detector for data collection. Fifteen new transitions were observed and five new energy levels at 1,460.41, 1,592.98, 1,620.36, 1,712.29, and 1,762.91 keV are suggested. The lifetime of three energy levels at 100.10, 1,289.45 and 1,553.57 keV were measured using the method of delayed coincidences. Relative intensities for the transitions and branching ratios of the energy levels were determined. ExperimentalK shell internal conversion coefficients α(K) and logft values were calculated and multipolarities, spins and parities deduced. Comparisons are made with theoretical predictions from the general collective model, the pairing plus quadrupole model and in particular theSU(3) limit of IBA calculations.