Resonance Capture of Protons byMg25

Protons from a Van de Graaff generator have been used to bombard targets of ${\mathrm{Mg}}^{25}$. The reaction ${\mathrm{Mg}}^{25}(p, \gamma ){\mathrm{Al}}^{26}\left({\beta }^{+}\right){\mathrm{Mg}}^{26}$ has been studied by observing the positron yield as a function of proton energy in the region between 300 and 1200 kev. Resonance peaks occur for protons with energies of 388, 494, 510, 563, 588, 650, 683, 722, 777, 812, 880, 928, 986, 1043, 1081, 1098, 1132, and 1197 kev. The cross section is of the order of ${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$ for the stronger resonances.