²⁷Al(n,p)²⁷Mg

Shown below is the ²⁷Al(n,p)²⁷Mg reaction and decay scheme. In this reaction a proton is produced promptly after the neutron capture leaving ²⁷Mg. The beta decay of ²⁷Mg feeds the first and second excited states of ²⁷Al. These states de-excite and emit 0.843 and 1.014 MeV gamma rays with branching fractions of 71 % and 29 % respectively.