C¹¹ has been produced by two new reactions; namely, B¹¹(p,n)C¹¹ and N¹⁴(p,α)C¹¹. The upper limit of the positron spectrum of C¹¹ has been measured in a cloud chamber and the value 0.95±{}0.03 Mev obtained. A new isotope, C¹⁰, has been produced by the reaction B¹⁰(p,n)C¹⁰. This nucleus has a disintegration period of 8.8±{}0.8 sec. The upper limit of the positron spectrum was found to be 3.36±{}0.1 Mev. A discussion is given of the relation which these measurements bear to the isobaric splitting and systematic properties of light nuclei.
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Delsasso et al. (1940) studied this question.