Elsevier

Nuclear Physics A

Volume 137, Issue 1, 3 November 1969, Pages 144-156
Nuclear Physics A

Evidence for the first forbidden β-decay16N(β)16O(2+, 9.85 MeV)

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Abstract

The sequential decay 16N(β)16O(α)12C from a gaseous source of 16N has been investigated by analysing the energy spectrum of 34 × 106 alpha particles.

A group of (1.84±0.33) × 104 alphas with an energy of 2017 ± 10 keV could be identified. These alphas are attributed to the decay from the 2+, 9.85 MeV state in 16O. For the 16N beta-decay branch leading to this state, the value log ft = 8.8±0.1 has been deduced, which corresponds to a branching ratio of (6.5±2.0) × 10−9. Parity-forbidden alpha decay from the 16O(2, 8.87 MeV) state has not been observed. The events which could be attributed to such a decay form a smaller fraction than 4 × 10−3 % of the total number of 6 × 107 alphas obtained from several measurements. This corresponds to a width Γα ≦ 0.94 × 10−10 eV for this decay.

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