Observation of ^{10}Be Emission in the Cold Ternary Spontaneous Fission of ^{252}Cf

Abstract

The emission of ${}^{10}\mathrm{Be}$ in ternary cold neutronless spontaneous fission of ${}^{252}\mathrm{Cf}$ is observed with the Gammasphere consisting of 72 detectors. The $\ensuremath{\gamma}$ ray corresponding to the decay of the first ${2}^{+}$ state in ${}^{10}\mathrm{Be}$ is observed in coincidence with the $\ensuremath{\gamma}$ rays of the fission partners of ${}^{96}\mathrm{Sr}$ and ${}^{146}\mathrm{Ba}$. The yield to the first excited state of ${}^{10}\mathrm{Be}$ in the ${}^{96}\mathrm{Sr}{\ensuremath{-}}^{146}\mathrm{Ba}$ split is the order of $4.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ per 100 fission events.