  This work is part of an ongoing project to develop a Superheated
Superconducting Granule (SSG) detector for cold dark matter and neutrinos. The
response of SSG devices to nuclear recoils has been explored irradiating SSG
detectors with a 70MeV neutron beam. The aim of the experiment was to test the
sensitivity of Sn, Al and Zn SSG detectors to nuclear recoil energies down to a
few keV. The detector consisted of a hollow teflon cylinder (0.1cm$^3$ inner
volume) filled with tiny superconducting metastable granules embedded in a
dielectric medium. The nuclear recoil energies deposited in the SSG were
determined measuring the neutron scattering angles with a neutron hodoscope.
Coincidences in time between the SSG and the hodoscope signals have been
clearly established. In this paper the results of the neutron irradiation
experiments at different SSG intrinsic thresholds are discussed and compared to
Monte Carlo simulations. The results show that SSG are sensitive to recoil
energies down to $\sim$1keV. The limited angular resolution of the neutron
hodoscope prevented us from measuring the SSG sensitivity to even lower recoil
energies.
