An upper limit of 5 keV on the width of the ${}^{12}\mathrm{O}$ ground state due to ${}^2\mathrm{He}$ emission is calculated using R-matrix formulas. This limit is much less than a recently published estimate.

• Received 29 June 2000

DOI:https://doi.org/10.1103/PhysRevC.63.047303