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Fig.1 shows neutron-proton ratio of nucleon emission(n/p)_(nucl)at freeze out of time as a function of beam energy E_b for two couples of reactions:~6He+~9Be,~6Li+~9Be;~8He+~9Be,~8Li+~9Be at the impact pa- rameter of 1.0 fm for two symmetry potentials U_1~(sym)and U_2~(sym).The thick and thin lines show(n/P)_(nucl)for
Fig. 1 shows neutron-proton ratio of nucleon emission (n / p) _ (nucl) at freeze out of time as a function of beam energy E_b for two couples of reactions: ~ 6He + ~ 9Be, ~ 6Li + ~ 9Be; ~ 8He + ~ 9Be, ~ 8Li + ~ 9Be at the impact pa- rameter of 1.0 fm for two symmetry potentials U_1 ~ (sym) and U_2 ~ (sym). The thick and thin lines show (n / P) _ (nucl) for