LIFETIME MEASUREMENTS OF STATES IN O¹⁸ AND Ne²²

Abstract

Lifetime measurements have been made by the Doppler-shift attenuation method for the 1.98-, 3.63-, 3.92-, and 4.45-Mev states in O 18 and the 1.28-, 3.34-, and 4.47-Mev states in Ne 22 , excited by the reactions Li 7 (C 12 , pγ)O 18 and Li 7 (O 16 , pγ)Ne 22 . Branching ratios have also been measured. The results are tabulated.[Formula: see text]The decay of the 3.92-Mev state in O 18 is 93.5% to the 1.98-Mev state and 6.5% to the ground state and of the 4.45-Mev state 74% to the 3.63-Mev state, 26% to the 1.98-Mev state, and less than 2% to the ground state. In Ne 22 , the ground-state transition from the 4.47-Mev state is less than 2% of the decay to the first excited state.