  The time difference between a particle interaction in a Superheated
Superconducting Granule (SSG) and the resulting phase transition signal has
been explored. Detectors containing Zn and Sn SSG were irradiated with neutrons
and protons to study the heating mechanism taking place in nuclear recoil and
ionizing events. Scattered neutrons have been detected by a scintillator
hodoscope behind the SSG with a recoil energy measurement resolution of 10% and
an interaction time resolution of 1ns. The fast transition of the metastable
granules allowed to determine the elapsed time between an energy deposition and
the phase transition signal. In the case of Sn granules, the results show that
the time distributions are narrow and independent of the deposited energy in
nuclear recoil and ionizing events. In Zn, however, the time distributions are
much broader and depend on the energy deposition in the granule.
