Spins and parities of levels in fission fragments

Efficient methods for using triple and fourfold gamma-ray coincidence data to give information on spins and parities of levels in secondary fission fr agments are described. Triple-gamma angular correlations and double-gamma a ngular correlations culled from triple coincidences with one observed isotr opically gamma ray for selectivity have been used to give information on th e multipole nature of transitions; directional linear polarization data cul led from fourfold coincidences with one isotropically observed g ray have b een used to provide parity information. Results for known cascades agree wi th predicted correlation and polarization patterns. Examples of the techniq ues applied to transitions in Mo-106 produced in the decay of Cm-248 are gi ven. (C) 1998 American Institute of Physics. [S0034-6748(98)00812-0].