The potential existence of the neutron halo [N-N] was discussed by Mr. Brightsen in his 1995 letter to Fusion Facts (see publications).  Although not discussed by Mr. Brightsen in any of his publications, the [N-N-N] halo cluster structure must also be a logical tri-nucleon cluster possibility in order to maintain model symmetry, although experimental evidence of a bound [N-N-N] resonance is apparently lacking at this time (comments are welcome if a bound resonance is known for N-N-N).  As relates to the paper below by Nesterov et al. (2001), the Brightsen Nucleon Cluster Model predicts the following "three-cluster configuration" for 8He that includes two neutron halos: an alpha core of two deuterium clusters {[N-P]+[N-P]} and [N-N] + [N-N].  Note that the alpha (4He) cluster is not fundamental according to the Brightsen NCM, but is in reality a union of two [N-P] clusters, each with their own spin properties, which is a hypothesis of the alpha counter to all other known "cluster models" of isotopes.  (comments are welcome).