Concentration of ${\mathrm{A}}^{36}$ and ${\mathrm{A}}^{38}$ and Study of the ${\mathrm{A}}^{36}\mathrm{}(d,p)\mathrm{}{\mathrm{A}}^{37}$ Reactions and the Beta-Activity of ${\mathrm{A}}^{39}$

The concentration of ${\mathrm{A}}^{36}$ up to 95.9 percent by the thermal diffusion method is described. Observation of the proton groups resulting from the deuteron bombardment of this gas gives the following $Q$-values for the ${\mathrm{A}}^{36}\mathrm{}(d,p)\mathrm{}{\mathrm{A}}^{37}$ reaction: 6.49, 5.05, 3.93, 2.95, 2.09, 1.86, 1.42 and 0.64 Mev. Comparison with the proton distribution from ${\mathrm{A}}^{40}\mathrm{}(d,p)\mathrm{}{\mathrm{A}}^{41}$ shows the importance of having well-separated isotopes for the resolution of proton groups of nearly the same energy from each isotope. The enrichment of ${\mathrm{A}}^{38}$ to 0.75 percent in this same gas makes measurement possible on the betas from the ${\mathrm{A}}^{38}\mathrm{}(d,p)\mathrm{}{\mathrm{A}}^{39}$ reaction. These ${\mathrm{A}}^{39}$ beta particles have a half-life of 160±5 seconds and a maximum energy of about 2.1 Mev.