Search for spontaneous collinear tripartition of ${}^{252}\mathrm{Cf}$ nuclei

Double arm spectrometer SAVEC has been used to identify spontaneous collinear tripartition of ${}^{252}\mathrm{Cf}$ nuclei: ${}^{M_0}{\overrightarrow{Z_0}}^{M_1}{Z}_1{+}^{M_3}{Z}_3{+}^{M_2}{Z}_2.$ No effect has been observed for $M_3>75\mathrm{}\hspace{0.5em}\mathrm{u}$ at the level of $7.5\times {10}^{-6}$ with respect to the probability of the binary fission process.