The upper limit for the ratio of the cross sections for the isospin forbidden ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(d,\alpha ){}_{}{}^{12}{}_{}{}^{}\mathrm{C}_{}^{*}{}_{}{}^{}$ (15.11 MeV, $1^{+}$, $T=1\mathrm{}$) transition and the isospin allowed ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(d,\alpha ){}_{}{}^{12}{}_{}{}^{}\mathrm{C}_{}^{*}{}_{}{}^{}$ (12.71 MeV, $1^{+}$, $T=0\mathrm{}$ transition was found to be about 0.3% in the angular range from 6 to 10° (lab) and 0.5% at 40 and 50°.

NUCLEAR REACTION ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(d,\alpha )$, $E=40\mathrm{}$ MeV; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$ at 8, 40, and 50°; upper limit for isospin mixing between 12.71 MeV $T=0\mathrm{}$ level and 15.11 MeV $T=1\mathrm{}$ level.

• Received 22 January 1974

DOI:https://doi.org/10.1103/PhysRevC.10.952