  Using a Li-6 nucleus beam extracted from the JINR Synchrophasotron at
momentum 2.67A GeV/c a secondary beam was produced with a composition of 1% of
He-6 and 99% of H-3 nuclei. Preliminary results on the features of
nucleus-nucleus interactions of He-6 nuclei and charge exchange (CE) of H-3
nucleus are presented. Interactions of He-6 nucleus external neutrons with
emulsion nuclei as well as a coherent stripping of He-6 nucleus external
neutrons are observed. A mean range of H-3 nuclei to inelastic interactions in
the BR-2 type emulsion is equal to 23.$\pm$3.0 cm. A mean range in emulsion for
a nuclear CE process H-3 to He-3 is equal to 40$\pm$16 m. The CE cross-sections
with a charged meson production or without it are approximately equal. The CE
cross-section with excitation of a target nucleus exceeds the one without
excitation. The mean transverse momentum of He-3 nuclei is equal to
0.16$\pm$0.03 GeV/c.
