\begin{table}%t9
\caption{Comparison of lifetimes of low-lying states of Ra I.}\label{table9}
%\centerline
{
\begin{tabular}{lccccccccc}
\hline \hline\noalign{\smallskip}
Level & $E$~({cm}$^{-1}$) & Type & This~work & MBPT$^a$ & MCDHF$^b$ & RHF$^c$ & MCDF$^d$ & RPP$^e$ & EXP$^f$ \\
 \hline 
6{d}7{s}~$^3${D}$_1$  & 13~715.85 & E1 & 694~$\mu$ {s} & 654~$\mu$ {s}& & 617~$\mu$ {s}  \\
6{d}7{s}~$^3${D}$_2$ & 13~993.97 & E2 & 3.0~{s}& 3.3~{s}&4~{s}&15~{s}&&  \\
7{s}7{p}~ $^3${P}$_1$$^{\circ}$ & 13~999.38 & E1 & 281~{ns}& 362~{ns}& & 505~{ns} & 250~{ns} & 420~{ns} & 422(20)~{ns} \\
7{s}7{p}~$^3${P}$_2$$^{\circ}$&16~688.54& E1&6.4~$\mu$ {s}&5.55~$\mu$ {s}&&5.2~$\mu$ {s}  \\
6{d}7{s}~$^1${D}$_2$  & 17~081.45 & E1 & -* & 129~$\mu$ {s}  &  & 38~{ms}  \\
7{s}7{p}~$^1${P}$_1$$^{\circ}$ & 20~715.71 & E1 & 5.2~{ns} & 5.53~{ns} & & 5.5~{ns}   \\
\hline
\end{tabular}}
\smallskip
$^{a}$ Many-body perturbation theory (Dzuba \& Ginges \cite{Dzuba2006}). $^{b}$ Multiconfiguration Dirac-Hartree-Fock (Bieron et~al. \cite{Bieron2004}). $^{c}$ Relativistic Hartree-Fock (Dzuba et~al. \cite{Dzuba2000}). $^{d}$ Multiconfiguration Dirac-Fock (Bruneau \cite{Bruneau1984}). $^{e}$~Relativistic pseudo-potential (Hafner \& Schwarz \cite{Hafner1978}). $^{f}$~Experiment (Scielzo et~al. 2006). $^{*}$ Affected by severe cancellation effects.
\end{table}