Investigation of neutron pair pre-emission at the fusion of ~11Li halo nuclei with Si Targets

摘要

The fusion of ~9,11Li with Si targets has been experimentally investigated. The neutron spectra in the 0.5-22.5 MeV energy range, corresponding to ~9L;I and ~11Li projectiles, have been measured by the aid of the RIKEN "long neutron wall" In the case of ~9Li the neutron spectrum is in good agreement with the Monte Calro calculated fusion-evaporation spectrum. In the case of ~11Li the neutron spectrum is showing that an important number of fusion events, are preceded by the breakup of one or two halo neutrons.