for the first time in 1982 by Cable [*et al.*]{} [@cable82]. The spin of the ground state of $^{22}Al$ is not known. In the mirror nucleus $^{22}F$, the spin of the ground state is $I^\pi = 4^+$, but this level is very close to a $3^+$ excited state ($E^*$=71.6 keV) and these states could be inverted in $^{22}Al$. As the $\beta$-decay energy of $^{22}Al$ is high ($Q_{\beta^+}~=~17.56$ MeV) [@audi03], different decay channels are open: $\beta$-$\gamma $, $\beta$-p (the one-proton separation energy $S_{p}$ in $^{22}Mg$ is equal to 5501.6 keV), $\beta$-2p ($S_{2p}$ = 7931 keV) and $\beta$-$\alpha $ ($S_{\alpha}$ = 8138.7 keV) decays are energetically possible.

Cable [*et al.*]{} [@cable82] were the first to study the $\beta$ decay of this nucleus. In their experiment, $^{22}Al$ was produced by a $^{24}Mg(^3He,p 4n)^{22}Al$ reaction at 110 MeV. The aluminum atoms were transported using a helium-jet technique. In the decay-energy spectrum, only two peaks at high energy were clearly seen, the low-energy part being contaminated by the decay of other nuclei. The measured energies correspond to 8212 $\pm$ 16 keV and 8537 $\pm$ 22 keV in the center of mass frame. Using energy and intensity considerations, these peaks were assigned to the isospin-forbidden proton 