PRODUCTION AND PROPERTIES OF C15

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Abstract
Uniform thin C14 targets on 2500 Å nickel backings were prepared in a discharge tube containing acetylene (enriched to 28.8% C14). A NaI (Tl) crystal was used to measure the yield of C15 (2.25 ± 0.05 sec. half life) from C14(d, p)C15 from Ed = 1.3 to 3.0 Mev. A 7.5 ± 1.5 sec. activity was also observed, presumably N16 produced by C14(d, γ)N16. The C15 gamma-ray spectrum indicates only a 5.3-Mev. transition. A plastic scintillator was used to measure the C15 beta spectrum. End-point energies of 9.5 ± 0.3 and 4.5 ± 0.2 Mev. with a branching ratio of 4 to 1 favoring the lower energy component were observed. The results are consistent with a spin and parity assignment of 1/2(+) for the C15 ground state.

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