The (He-3, t) charge exchange reaction at 2. GeV incident energy with
the new setup SPES IV-pi has been realized in December 1995 and March
1996, in order to study the coherent production process of pions. This
setup allows to isolate the ground state of the target nucleus, and t
o sign this process without ambiguity. We give some preliminary result
s in target excitation energy and tranfered energy.