A search for parity-forbidden alpha-decay from the 8.88 MeV (2) state in O16

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Abstract

The parity-forbidden alpha-decay of the O18 8.88 MeV (2) state into C12+α has been proved to be less frequent than the alpha-decay of the 9.58 (I−) state by a factor < 1.4 × 10−6. From this experimental fact, an upper limit for the intensity F2 of a possible opposite parity admixture to the 8.88 MeV state in O16 can be derived. It depends on the assumption made about Λα, the level width of a hypothetical 8.88 MeV (2−) state in O16 and ranges between F2 ≦ 1.3% 10−12 to 1.3 × 10−11 according to Lα = 6 keV to 0.6 keV.

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