We extract energies and widths of the ground states of ${}_{}{}^5{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^5{}_{}{}^{}\mathrm{Li}$ from recent single-level R-matrix fits to the spectra of the ${}_{}{}^3{}_{}{}^{}\mathrm{H}$(d,γ${)}^5$He and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(d,γ${)}^5$Li reactions. The widths obtained differ significantly from the formal R-matrix values but they are close to those measured as full widths at half maxima of the spectra in various experiments. The energies are somewhat lower than those given by usual estimates of the peak positions. The extracted values are close to the S-matrix poles calculated previously from the multiterm analyses of the N${\mathrm{-}}^4$He elastic scattering data. © 1996 The American Physical Society.

• Received 14 September 1995

DOI:https://doi.org/10.1103/PhysRevC.54.1485