A fully antisymmetrized microscopic model is developed for light two-neutronhalo nuclei using a hyper-spherical basis to describe halo regions. Themany-body wavefunction is optimized variationally. The model is applied to 6Hebound by semi realistic Minnesota nucleon-nucleon forces. The two-neutronseparation energy and the radius of the halo are reproduced in agreement withexperiment. Antisymmetrization effects between 4He and halo neutrons are foundto be crucial for binding of 6He. We also properly extract two-neutron overlapfunctions and find that there is a significant increase of 30%-70% in theirnormalization due to microscopic effects as compared to the results ofthree-body models.
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