The tensor analyzing powers of the ${}_{}{}^1{}_{}{}^{}\mathrm{H}$(d→,γ${)}^3$He reaction are sensitive to the tensor component of the nucleon-nucleon force, which mixes the L=2 D state into the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ ground state wave function. Modern Faddeev calculations of this reaction allow a quantitative comparison to the parametrization of the tensor force in the trinucleon system. The ${\mathit{T}}_{20}$ analyzing power was measured at an incident beam energy of 5.25 MeV and a laboratory angle of 90° (${\mathrm{\theta }}_{\mathrm{c}.\mathrm{m}.\mathrm{}}$=92.9°), where the comparison to theory is especially rigorous. The measured value of ${\mathit{T}}_{20}$(${90}_{\mathrm{lab}}^{\mathrm{°}}$) is -0.035±0.004, which differs by ≊3σ from a recent Faddeev calculation which uses the separable expansion of the Paris potential. © 1996 The American Physical Society.

• Received 10 November 1995

DOI:https://doi.org/10.1103/PhysRevC.54.1538