Neutron-rich argon nuclei

It is shown that the ${\left(\pi d_{\frac{3}{2}}\right)}^{-2\mathrm{}}{(\nu f_{\frac{7}{2}},\nu p_{\frac{3}{2}})}^n$ model previously used to interpret the data on the lighter argon nuclei can be used to understand the recently observed results in ${}_{18}{}^{}{}_{}{}^{43}\mathrm{Ar}_{25}^{}{}_{}{}^{}$ and ${}_{18}{}^{}{}_{}{}^{44}\mathrm{Ar}_{26}^{}{}_{}{}^{}$. The first excited state of ${}_{18}{}^{}{}_{}{}^{44}\mathrm{Ar}_{26}^{}{}_{}{}^{}$ is predicted to be a core-excited $0^{+}$ level arising from the configuration ${[{{\left(d_{\frac{3}{2}}\right)}^{-4\mathrm{}}}_{00}\times {{\left(f_{\frac{7}{2}}\right)}^8}_{04}]}_{J=0,T=4\mathrm{}}$.