  The energy spectra of light charged particles and intermediate mass fragments
from 112Sn+112Sn and 124Sn+124Sn collisions at an incident energy of E/A=50 MeV
have been measured with a large array of Silicon strip detectors. We used
charged particle multiplicities detected in an array with nearly 4-pi coverage
to select data from the central collision events. We study isospin observables
analogous to ratios of neutron and proton spectra, including double ratios and
yield ratios of t/3He and of asymmetries constructed from fragments with Z=3 to
Z=8. Using the energy spectra, we can construct these observables as functions
of kinetic energy. Most of the fragment asymmetry observables have a large
sensitivity to sequential decays.
