Strong indication of true quaternary fission of Cf-252 (sf)

In our previous publications we discussed possible physical scenario standing behind rectangular-like structures in the fission fragments mass-correlation distributions from Cf-252(sf). The rectangle is bounded by the known magic nuclei such as Ni-68, Se-84 and others. The fission events aggregated in the rectangle show extremely low total kinetic energies. Previously only decay mode with two Ni clusters in the exit channel was discussed. A more complete analysis is presented which gives additional arguments in favour of true quaternary fission of Cf-252 (sf).