Measurements of Interaction Cross Sections and Nuclear Radii in the Light<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Shell Region

Interaction cross sections (${\ensuremath{\sigma}}_{I}$) for all known Li isotopes ($^{6}\mathrm{Li}$-$^{11}\mathrm{Li}$) and $^{7}\mathrm{Be}$, $^{9}\mathrm{Be}$, and $^{10}\mathrm{Be}$ on targets Be, C, and Al have been measured at 790 MeV/nucleon. Root mean square radii of these isotopes as well as He isotopes have been deduced from the ${\ensuremath{\sigma}}_{I}$ by a Glauber-type calculation. Appreciable differences of radii among isobars ($^{6}\mathrm{He}$-$^{6}\mathrm{Li}$, $^{8}\mathrm{He}$-$^{8}\mathrm{Li}$, and $^{9}\mathrm{Li}$-$^{9}\mathrm{Be}$) have been observed for the first time. The nucleus $^{11}\mathrm{Li}$ showed a remarkably large radius suggesting a large deformation or a long tail in the matter distribution.