Abstract
ON irradiating scandium (45Sc) with fast neutrons of energy< 20 × 106 e.v., Pool, Cork and Thornton1 observed two positron-emitting radioactive isotopes of scandium of half-lives 52 hours ('strong intensity') and 4 hours ('very strong intensity') respectively. With neutrons of <10 × 106 e.v., neither period could be observed. Previously Walke2 had given the following assignment of radioactive isotopes of scandium: 44Sc (52 hours), 43Sc (4·0 ± 0·1 hours), 42Sc (4·1 ± 0·1 hours). These he attributed to the reactions: 39K(α,n)42Sc, 41K(α,n)44Sc, 40Ca(α,p)43Sc, 42Ca(d, n)43Sc and 43Ca(d, n)44Sc. Pool, Cork and Thornton suggested that the two periods which they observed were due to the formation of 44Sc and 43Sc resulting from the reactions and
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References
Pool, Cork and Thornton, Phys. Rev., 52, 41 (1937).
Walke, Phys. Rev., 51, 439 (1937); 52, 669 (1937).
Naturwiss., 26, 109 (1938).
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BURCHAM, W., GOLDHABER, M. & HILL, R. Radioactivity produced in Scandium by Fast Neutrons. Nature 141, 510 (1938). https://doi.org/10.1038/141510a0
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DOI: https://doi.org/10.1038/141510a0
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