4406           0.36
  ------- --------- ------- ------------ ----------------

  : *Branching ratios for sequential $\beta$-2p emissions calculated for a ground state spin-parity of $4^+$ and $3^+$. For each initial state in $^{22}Mg$ and final state in $^{20}Ne$ the branching ratios of different transitions were summed. The energies tabulated are the calculated excitation energies. The total proton energy of the transition in the fourth column can be obtained by the subtraction of the final state energy, added to the 2p separation energy, from the initial state energy. All energies are in keV.*[]{data-label="tab:cal_br_2p"}

Results and discussion  {#sec:6}
=======================

In this section, we compare our experimental results to previous measurements as well as to model predictions. This comparison will allow us to favour one of the two possible spin-parity assignments for the ground state of $^{22}Al$ and to construct a new $\beta$-decay scheme.\

1.  Half-life\
    The $^{22}Al$ half-life has been measured twice before this experiment. The first measurement was done by Cable [*et al.*]{} [@cable82] and they found $T_{1/2}=70^{+50}_{-35}~ms$. The second measurement was performed by Blank [*et al.*]{} [@blank]. The value measured was smaller $T_{1/2}=59 \pm 3~ms$ but consistent with the first value. This last value is in conflict with our value of $T_{1/2}=91.1 \pm 