Spins and parities of levels in fission fragments

Efficient methods for using triple and fourfold γ-ray coincidence data to give information on spins and parities of levels in secondary fission fragments are described. Triple-γ angular correlations and double-γ angular correlations culled from triple coincidences with one γ ray observed isotropically for selectivity have been used to give information on the multipole nature of transitions; directional linear polarization data culled from fourfold coincidences with one isotropically observed γ ray have been used to provide parity information. Results for known cascades agree with predicted correlation and polarization patterns. Examples of the techniques applied to transitions in Mo106 produced in the decay of Cm248 are given.

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