Abstract
A search was carried out for the α-particle decay of the 15∙1 MeV state in
12
C. The state was made by the
10
B (
3
He,
p
)
12
C reaction. The protons feeding the 15∙1 MeV state were seen in proton singles spectra and in coincidence with 15∙1 MeV
γ
-rays, but none were seen in coincidence with
α
-particles. Comparison with a nearby state known to decay virtually solely by α-particles established that the 15∙1 MeV state
α
-decays less than 20 % of the time. Combining this result with the results of γ-ray resonance scattering we find that ┌
α
< 15 eV. The sensitivity of the experiment was limited by a continuum from the break-up of the
10
B +
3
He system.
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