The Neutrons from the Disintegration of the Separated Isotopes of Magnesium by Deuterons

Abstract

When ${\mathrm{Mg}}^{25}$ is irradiated by deuterons, four groups of neutrons appear from which nuclear energy levels are deduced in ${\mathrm{Al}}^{26}$ at 2.00\ifmmode\pm\else\textpm\fi{}0.18 Mev, 3.63\ifmmode\pm\else\textpm\fi{}0.18 Mev, and 5.13\ifmmode\pm\else\textpm\fi{}0.18 Mev. The $Q$-value for the formation of ${\mathrm{Al}}^{26}$ in the ground state is 5.58\ifmmode\pm\else\textpm\fi{}0.10 Mev. From the disintegration data, the mass of ${\mathrm{Al}}^{26}$ is calculated to be 25.9935\ifmmode\pm\else\textpm\fi{}9\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ mu.Bombardment of ${\mathrm{Mg}}^{26}$ by deuterons gives rise to eight groups of neutrons corresponding to energy levels in ${\mathrm{Al}}^{27}$ at 0.88\ifmmode\pm\else\textpm\fi{}0.07, 1.92\ifmmode\pm\else\textpm\fi{}0.07, 2.75\ifmmode\pm\else\textpm\fi{}0.07, 3.65\ifmmode\pm\else\textpm\fi{}0.07, 4.33\ifmmode\pm\else\textpm\fi{}0.07, 5.32\ifmmode\pm\else\textpm\fi{}0.07, and 5.81\ifmmode\pm\else\textpm\fi{}0.07 Mev. The $Q$-value for the formation of ${\mathrm{Al}}^{27}$ in the ground state is 5.68\ifmmode\pm\else\textpm\fi{}0.05 Mev.No quantitative analysis was made of the reaction ${\mathrm{Mg}}^{24}(D,n){\mathrm{Al}}^{25}$. However, since ${\mathrm{Mg}}^{24}$ was the principal isotopic impurity, it was necessary to show that its presence made no contribution to the spectra of the two preceding reactions.

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