  At the ion accelerator HELIS at the LPI, the neutron yield is investigated in
DD reactions within a polycrystalline deuterium-saturated CVD diamond, during
an irradiation of its surface by a deuterium ion beam with the energy less than
30 keV. The measurements of the neutron flux in the beam direction are
performed in dependence on the target angle, \b{eta}, with respect to the beam
axis. These measurements are performed using a multichannel detector based on
He3 counters. A significant anisotropy in neutron yield is observed, it was
higher by a factor of 3 at \b{eta}=0 compared to that at \b{eta} = +-45{\deg}.
The possible reasons for the anisotropy, including ion channeling, are
discussed.
