Production of the Neutron-Rich HypernucleusLiΛ10in the(π−,K+)Double Charge-Exchange Reaction

In order to produce a neutron-rich $\ensuremath{\Lambda}$ hypernucleus for the first time, we carried out an experiment by utilizing the $({\ensuremath{\pi}}^{\ensuremath{-}},{K}^{+})$ double charge-exchange reaction on a $^{10}\mathrm{B}$ target. We observed the production of a $_{\ensuremath{\Lambda}}^{10}\mathrm{L}\mathrm{i}$ hypernucleus. The cross section for the $\ensuremath{\Lambda}$ bound region was found to be $11.3\ifmmode\pm\else\textpm\fi{}1.9\text{ }\text{ }\mathrm{n}\mathrm{b}/\mathrm{s}\mathrm{r}$ with the $1.2\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ incident momentum, which is compared with the $_{\ensuremath{\Lambda}}^{10}\mathrm{B}$ hypernucleus production cross section, $7.8\ifmmode\pm\else\textpm\fi{}0.3\text{ }\text{ }\ensuremath{\mu}\mathrm{b}/\mathrm{s}\mathrm{r}$, in the $({\ensuremath{\pi}}^{+},{K}^{+})$ reaction with a $1.05\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ incident momentum beam.