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The 48.7m 111"Cd activity was implanted in Zn and Be single crystals which were soldered to the cold finger of a dilution refrigerator and kept below 0.2 K during implantation. Subsequent nuclear orientation experiments allowed the determination of the quadrupole interaction frequency vQ of the 11/2-isomeric state of 111Cd in Zn and Be as -139(15)MHz and +43(16)MHz respectively. With these results we derive the quadrupole moment of the 5/2 + 245 keV level of 111Cd including sign as Q = +0.83 (13) b and the sign of the electric field gradient for Cd in Be. The half-life of 11~'~Cd was redetermined as 48.67 (6) m.

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