Anti-cluster Decay and Anti-alpha Decay of Antimatter nuclei

A broad extension of periodic system into the sector of antimatter could be possible sometimes in a remote future. We expect that anti-alpha spontaneous emission from an antimatter nucleus will have the same Q-value and half-life as alpha emission from the corresponding mirror nucleus. This is the consequence of the invariance of binding energy as well as of the surface and Coulomb energy when passing from matter to antimatter nuclei with the the same mass number and the same atomic number. The Q-values and half-lives of all measured up to now 27 cluster radioactivities are given together with Q-values and half-lives of the most important competitor --- $\alpha$ decay. The lightest anti-alpha emitter, $^8\bar{Be}$, will have a very short half-life of about $81.9\cdot 10^{-18}$ s.