Alpha decay of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ excited states

The one-level R-matrix approach is used to calculate alpha decay widths for several low-lying $0^{+}$, $2^{+}$, and $4^{+}$ excited states of the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ nucleus. The interior wave functions are calculated within the ZBM (${\mathit{p}}_{1/2}$,${\mathit{d}}_{5/2}$,${\mathit{s}}_{1/2}$) shell-model space with various effective interactions. The exterior wave functions are calculated from an α${+}^{12}$C folding model potential obtained with the M3Y interaction. A new method for calculating the channel radius using the matching of the interior and exterior wave functions in the α-decay channel is presented.