A Monte Carlo program describing the Penetration of H(n)+ hydrogen clu
sters in thin foils has been used to build a model of charge exchange
for protons resulting from the breakup of these clusters. The total ne
utral fractions observed at emergence with cluster projectiles H(n)+,
n < 23 in the energy range 40-120 keV/u, as well as the number of 2p e
xcited states are well reproduced by these calculations taking into ac
count geometrical structures of the projectiles and vicinity effects.