Elsevier

Nuclear Physics

Volume 44, June–July 1963, Pages 220-255
Nuclear Physics

Lifetimes of the low-lying levels of O18 and F18

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Abstract

The lifetimes or limits on the lifetimes of five levels in O18 and six levels in F18 have been measured by the Doppler shift attenuation method. Large initial Doppler shifts for the gamma rays from O18 and F18 were obtained by bombarding tritium with 11 to 16 MeV oxygen ions from a tandem accelerator. The mean lifetimes in psec of the 1.98, 3.55, 3.63, 3.92 and 4.45 MeV levels in O18 were found to be 3.7±0.7, > 3, 3±1, 0.18±0.06 and <0.1, respectively. The mean lifetimes in psec of the 0.94, 1.04, 1.08, 2.10 and 2.53 MeV levels in F18 were found to be > 3, < 0.3, > 1.0, 2.0±1.0, 0.70±0.20, 1.1±0.2, respectively. The significance of these measurements is discussed.

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    Atomic Energy of Canada Limited, Chalk River, Ontario, Canada. Work done while seconded to the Clarendon Laboratory, Oxford.

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