Mössbauer Effect inEu151; Possible Influence of Optical Branches

Abstract
The Mössbauer effect has been observed in the 21.7-keV transition in Eu151. The absorption pattern is a single line, independent of temperature, as expected for an ion in which the ground level has J=0. A lower limit of 0.92×108 sec can be set on the lifetime of the isomeric state.

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