Is there an abrupt fall of spontaneous fission half-lives in ${}^{248}$No and ${}^{252}$Rf?

Spontaneous fission and α decay from the ground state of nuclei ${}^{248}$No and ${}^{252}$Rf are studied within the dinuclear system model. All these decay processes are considered as the evolution of a nucleus in the charge (mass) asymmetry coordinate. For the even-even and even-odd nobelium and rutherfordium isotopes, the available experimental spontaneous fission and α-decay half-lives of the ground state are effectively described.