Cold (neutronless) $\alpha$ ternary fission of ${}^{252}$Cf

The phenomenon of cold (neutronless) alpha ternary fission in spontaneous fission of ${}^{252}$Cf was experimentally observed by triple gamma coincidence technique with Gammasphere with 72 gamma-ray detectors. Correlated pairs of ${}_{36}$Kr-${}_{60}$Nd, ${}_{38}$Sr-${}_{58}$Ce, ${}_{40}$Zr-${}_{56}$Ba, ${}_{42}$Mo-${}_{54}$Xe, ${}_{44}$Ru-${}_{52}$Te, and ${}_{46}$Pd-${}_{50}$Sn were observed to be associated with $\alpha$ ternary fission of ${}^{252}$Cf. Yields of cold $\alpha$ ternary fission were extracted.