The threshold energy for the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$(p,n${)}^{10}$C reaction and the energy of the 720 keV gamma ray which follows the decay of ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ have been measured to be 4876.91±0.10 keV and 718.353±0.011 keV, respectively. This has enabled the energy of the superallowed positron decay of ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ to be determined to be 885.72±0.09 keV, which is a necessary step in the deduction of an accurate ft value.

• Received 20 March 1989

DOI:https://doi.org/10.1103/PhysRevC.40.940