The threshold energy of the ${}^{14}\mathrm{N}{\mathrm{}(p,n)\mathrm{}}^{14}\mathrm{O}$ reaction has been measured to be 6354.35(18) keV relative to a 1-V standard, and an earlier value has been withdrawn. This leads to a $Q_{\mathrm{ec}}$ value for the superallowed positron decay of ${}^{14}\mathrm{O}$ of 2831.53(17) keV and a recommended mean value of $Q_{\mathrm{ec}}=2831.47\mathrm{}\left(14\right)\mathrm{}\mathrm{keV}.$

• Received 14 January 2003

DOI:https://doi.org/10.1103/PhysRevC.67.035503