Projectile fragmentation of the extremely neutron-rich nucleus Li11 at 0.79 GeV/nucleon

Projectile fragmentations of Li11, He8, and He6 have been measured at 0.79 GeV/nucleon. Production cross sections and momentum distributions of the produced isotopes (Z2) are measured inclusively. Transverse-momentum distributions of Li9 from the fragmentation of Li11 show two Gaussian components of different widths. The width of the wide component is consistent with the values observed in the fragmentation of stable nuclei, whereas the other component shows an extremely narrow width reflecting the weak binding of the two outer neutrons in the Li11 nucleus.