We have experimentally located a polarization extremum ($A_y=-1\mathrm{}$) in triton-α elastic scattering near $E_t=11.1\mathrm{}$ MeV, ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=95\mathrm{}°$. This is the first application and test of a Lamb-shift polarized tritium ion source which has been installed on the Los Alamos tandem accelerator. The results verify the accuracy of the quench-ratio method for the determination of the polarization of the triton beam.

NUCLEAR REACTIONS ${}_{}{}^4{}_{}{}^{}\mathrm{He}(\overrightarrow{t},t)$; $E_t=10.2\mathrm{}-11.7$ MeV, measured $A_y\left(\theta \right)$. Demonstrated existence of $A_y=-1\mathrm{}$ point.

• Received 29 December 1975

DOI:https://doi.org/10.1103/PhysRevC.13.2127