Spectroscopy of the lithium isotopes 7-9Li
Abstract.Experimental search for highly excited states of the lithium isotopes 7-9Li was carried out in the stopped $\pi^{-}$-meson absorption reactions. Several states were found for the first time. Evidence of the existence of the 8Li level with $ E_{x}=11.2\pm 0.2$ MeV, $ 13.5\pm 0.1$ MeV and $ 17.5\pm 0.3$ MeV was found in the 12C($ \pi^{-}, dd$)X reaction. In the 11B($ \pi^{-}, d$)X reaction the level of 9Li with $ E_{x}=9.1\pm 0.1$ MeV, which lies above the threshold 9Li*$ \rightarrow$6He $ +t $, was observed. An indication for the formation of the 9Li state with $ E_{x}\approx 10.5$ MeV was obtained in the 12C($ \pi^{-},p d$)X reaction.