Exotic Nuclear Decay of ${}^{223}{Ra}$ by Emission of ${}^{14}C$ Nuclei

The exotic nuclear decay of

{}^{223}{Ra}

by emission of

{}^{14}C

nuclei has been investigated by use of an intense radioactive

{}^{227}{Ac}

source and a magnetic spectrometer with a large solid angle. After a run of 5 d, a group of eleven events was observed at the expected location of

{}^{14}C

in a

Δ E - E

telescope calibrated with a

{}^{14}C

beam. A branching ratio of (5.5 ± 2.0) ×

10^{- 10}

was measured for the emission of

{}^{14}C

nuclei relative to

α

particles from

{}^{223}{Ra}

in agreement with the previously reported ratio of (8.5 ± 2.5) ×

10^{- 10}

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Exotic Nuclear Decay ofRa223by Emission ofC14Nuclei