Hyperfine Structure and Nuclear Moments of 20.4-Min $C^{11}$

We have measured the hyperfine structure in the

{}^{3}P_{2}

and

{}^{3}P_{1}

states of the ground state configuration of

C^{11}

by the atomic-beam magnetic-resonance technique. The values obtained after corrections for perturbations by nearby fine-structure states are

{}^{3}P_{2}

\frac{A}{h} = (-) 68.203 \pm 0.007

Mc/sec,

\frac{B}{h} = (-) 4.949 \pm 0.028

Mc/sec;

{}^{3}P_{1}

\frac{A}{h} = (-) 1.242 \pm 0.010 Mc / sec or (-) 1.200 \pm 0.010 Mc / sec

depending upon the choice of zero-field level ordering, where

B (J = 1) = - \frac{B (J = 2)}{2}

. From these data it is possible to calculate the nuclear moments of the mirror nucleus,

C^{11}

, using a theoretical value of

〈 \frac{1}{r^{3}} 〉

for the

p

electrons. The results are

μ_{I} = (-) 1.027 \pm 0.010

nm,

Q_{uncorrected} = (+) (0.0308 \pm 0.0006) \times 10^{- 24}

{cm}^{2}

. No signs were measured in these experiments; the indicated signs assume

μ_{I} < 0

C^{11}

. A value of 1.5011±0.0006 for

g_{J}

was also obtained in the

{}^{3}P_{2}

state.

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Hyperfine Structure and Nuclear Moments of 20.4-MinC11