Stringent upper limit on the direct 3 α decay of the Hoyle state in C 12

@article{Smith2020StringentUL,
  title={Stringent upper limit on the direct 3 α decay of the Hoyle state in C 12},
  author={R. Smith and M. Gai and M. Ahmed and M. Freer and H. Fynbo and D. Schweitzer and S. Stern},
  journal={Physical Review C},
  year={2020},
  volume={101},
  pages={021302}
}
We investigate an implication of the most recent observation of a second Jπ=2+ state in 12C, which was measured using the 12C(γ,α)8Be(g.s.) reaction. In addition to the dissociation of 12C to an α-particle and 8Be in its ground state, a small fraction of events (2%) were identified as direct decays and decays to excited states in 8Be. This allowed a limit on the direct 3α partial decay width to be determined as Γ3α<32(4) keV. Since this 2+ state is predicted by all theoretical models to be a… Expand
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