Abstract
A new method to determine the multipolarity of a converted γ-transition from itsL x-ray spectrum has been extended by a coincidence technique and applied in the complex decays of227Th,243Am, and249Cf. TheL x-ray spectra of four low energy transitions have been measured in coincidence with cascading high energy γ-rays and theirM1-E2 mixing ratios obtained by comparison with calculatedL x-ray line intensities. The following results were obtained: for the 3/2+→l/2+ ground-state transition in223Ra, an admixture of (74±12)%E2, for the 7/2+→5/2+ ground-state transition in239Np, less than 30%E2, for the 9/2+→7/2+ ground-state transition in245Cm, (63±10)%E2, and for the 11/2−→ 9/2− transition in the third rotational band in245Cm, (32±10)%E2.
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