  We exploit the possibility of new configurations in three-body halo nuclei -
Samba type - (the neutron-core form a bound system) as a doorway to Borromean
systems. The nuclei $^{12}$Be, $^{15}$B, $^{23}$N and $^{27}$F are of such
nature, in particular $^{23}$N with a half-life of 37.7 s and a halo radius of
6.07 fm is an excellent example of Samba-halo configuration. The fusion below
the barrier of the Samba halo nuclei with heavy targets could reveal the so far
elusive enhancement and a dominance of one-neutron over two-neutron transfers,
in contrast to what was found recently for the Borromean halo nucleus $^6$He +
$^{238}$U.
