The Isoscaling Results From Ca$+$Ni and Ca$+$Sn Systems at E/A$=$56, 140MeV

When comparing 2 Heavy-Ion-Collision(HIC) systems with same temperature but different neutron and proton (isospin) content, the isotope yield ratio with neutron number and proton number (N,Z) be expressed by an exponential function R21$=$ Y\textunderscore 2(N,Z)/Y\textunderscore 1(N,Z) $=$CExp($\alpha $N$+\beta $Z). This phenomenon is called isoscaling in HIC suggesting that the nuclear system reaches chemical equilibrium in most heavy ion collisions. In this talk, a systematic isoscaling results from 40,48Ca$+$58,64Ni and 40,48Ca$+$112,124Sn systems at E/A$=$56, 140MeV and “neutron” spectra constructed from isoscaling will be presented.