Excited States of 11Li in a three body model -: art. no. 034007

A three body model for Li-11 proposed earlier [S. Dasgupta et al., Phys. Rev. C 50, R510 (1994)] employing separable potentials for n-n and n-Li-9 interactions has been extended to study the recently observed excited states in Li-11 above the three body breakup threshold. The n-Li-9 potential used here includes both s- and p-state interactions so as to incorporate the virtual s- state and p-wave resonance observed experimentally. The resulting coupled integral equations for the spectator functions have been computed using the method of rotating the integral contour of the kernels in the complex plane. The model predicts the ground state energy as well as the three excited states in reasonable agreement with the data recently obtained. Dynamical content of the two body input potentials in the three body wave function has also been analyzed through the three-dimensional plots.