K-shell autoionization accompanying the beta decays ofTc99,Pm147,Sm151, andTl204

The $K$-shell autoionization probabilities of ${}_{}{}^{99}{}_{}{}^{}\mathrm{Tc}$, ${}_{}{}^{147}{}_{}{}^{}\mathrm{Pm}$, ${}_{}{}^{151}{}_{}{}^{}\mathrm{Sm}$, and ${}_{}{}^{204}{}_{}{}^{}\mathrm{Tl}$ have been determined to be (3.52 ± 0.20) × ${10}^{-4\mathrm{}}$, (0.936 ± 0.063) × ${10}^{-4\mathrm{}}$, (0.024 ± 0.003) × ${10}^{-4\mathrm{}}$, and (1.22 ± 0.16) × ${10}^{-4\mathrm{}}$, per decay, respectively. The first excited state branching ratios for ${}_{}{}^{147}{}_{}{}^{}\mathrm{Pm}$ and ${}_{}{}^{151}{}_{}{}^{}\mathrm{Sm}$ are (6.48 ± 0.56) × ${10}^{-5\mathrm{}}$ and (0.94 ± 0.06) × ${10}^{-2\mathrm{}}$, respectively. The $K$-shell electron capture to beta decay ratio for ${}_{}{}^{204}{}_{}{}^{}\mathrm{Tl}$ is (1.22 ± 0.06) × ${10}^{-2\mathrm{}}$. The autoionization probabilities are compared to the theory of Law and Campbell as modified by Isozumi, Shimizu, and Mukoyama.