Using 56C0 sources, a 3.254 MeV level in 238U was photoexcited by a y-line emitted in the decay of the 4.100 MeV level in 56Fe. 10 y-transitions deexciting this 3.254 MeV level were identified. Spin and parity were determined to be 1 . By moving the S6Co source in a high speed centrifuge the profile of the 3.254 MeV emission line was investigated.By applying a new variety of Doppler shift analysis a lifetime OfZve = 55 _+ 25 fs was obtained for the 4.100 MeV level in S6Fe. The cross section for nuclear resonance fluorescence yields a lifetime of rv = 0.33 _+ 0.12 ps for the 3.254 MeV level in 23SU.
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