  Numerical simulations and cluster mean-field approximations with coherent
anomaly extrapolation show that the critical line of the 1d annihilation
fission process is separated into two regions. In both the small and high
diffusion cases the critical behavior is different from the well known
universality classes of non-equilibrium phase transitions to absorbing states.
The high diffusion region seems to be well described by the cyclically coupled
directed percolation and annihilating random walk. Spreading exponents show
non-universal behavior.
