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Neutron activation of aluminum may occur by several neutron capture reactions. Four such reactions are described here: 27Al + n = 28Al, 27Al(n,a )24Na, 27Al(n,2n)26Al and 27Al(n,p)27Mg. The radioactive nuclei 28Al, 24Na, and 27Mg, which are produced via the 27Al + n = 28Al, 27Al(n,a )24Na and 27Al(n,p)27Mg neutron reactions, beta decay to excited states of 28Si, 24Mg and 27Al respectively. These excited states then emit gamma rays as the nuclei de-excite to their respective ground states.
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