The quadrupole moment of the 8-jus fission isomer in 239 pu has been determined with a newly developed charge-plunger technique for measuring lifetimes of states decaying by converted transitions. With a statistical accuracy of 7%, values between 34 and 39 b are obtained, depending on the unknown isomeric spin. The deformation of the second minimum described by the axis ratio of a spheroid is deduced to be c/a = 2.0*0.1.
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