Mass Asymmetry and Total-Kinetic-Energy Release in the Spontaneous Fission of[105]262

Mass and total-kinetic-energy (TKE) distributions of fission fragments from the spontaneous fission of ${}_{}{}^{262}{}_{}{}^{}\mathrm{}\left[105\right]\mathrm{}$ and ${}_{}{}^{256}{}_{}{}^{}\mathrm{Fm}$ have been obtained. No events with anomalously high TKE were observed, contrary to theoretical expectations. The mass distribution from the fission of ${}_{}{}^{262}{}_{}{}^{}\mathrm{}\left[105\right]\mathrm{}$ is very probably asymmetric and similar to distributions obtained from all spontaneously fissioning systems with the exception of ${}_{}{}^{257}{}_{}{}^{}\mathrm{Fm}$ and ${}_{}{}^{259}{}_{}{}^{}\mathrm{Fm}$.