STRUCTURE OF LI-11 IN THE CLUSTER-ORBITAL SHELL-MODEL FOR THE LI-9+N+N SYSTEM

The properties of 11Li are studied in detail in the cluster-orbital shell model assuming the structure of 9Li + n + n. The interactions acting between the constituent particles are carefully determined consistently with available data. Large and flexible bases for the valence neutrons are represented as a superposition of gaussian functions. The anomalously large radius of 11Li is nicely reproduced. The density distributions calculated clarify the picture of the neutron halo. The binding energy is, however, calculated to be 1-1.4 MeV short. A possible resolution of this point is discussed from the viewpoint of the di-neutron clustering. The quadrupole moment of 11Li is predicted to be almost the same as that of 9Li. © 1990.