Abstract
The γ-ray and conversion electron spectra of mass-separated 240Am samples were measured with high-resolution Ge(Li) and Si(Li) spectrometers. The conversion coefficients of the 42·9, 99·0, 888·7 and 987·7 keV transitions were measured and their multipolarities were established as E2. A ce −-γ-ray coincidence experiment showed that the 888·7 and 987·7 keV transitions originate from a 1030·6 keV level. On the basis of the measured log ft value the ground state of 240Am has been given a spin-parity assignment of 3- with the configuration {n[631] 1 2 +; p[523] 5 2 −} . The 1030·6 keV level of 240Pu has been given a spin-parity assignment of 3+ with the two-quasi-particle configuration {n[631] 1 2 +; n[622] 5 2 +} . Several other low intensity γ-rays were observed. The half-life of 240Am was measured to be 50·8 ± 0·3 hr which is in agreement with previously reported values.
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