Asymmetries for the $({\pi }^{-},{\pi }^0)$ reaction on polarized ${}^3\mathrm{He}$ were measured using a 200-MeV pion beam at LAMPF. The ${\pi }^0$’s were detected with the neutral meson spectrometer in coincidence with the recoiling tritons. A recoil triton detector, consisting of scintillation-counter telescopes and a wire chamber, was used to measure the time-of-flight, energy loss, and direction of the tritons. The polarized gaseous ${}^3\mathrm{He}$ target, developed at TRIUMF, was modified to run with two diode lasers; the polarization reached 65%. The asymmetries between ${\theta }_{\mathrm{lab}}=60\mathrm{}°$ and $105°$ were found to be strongly angle dependent. The results are compared with theoretical calculations.

• Received 8 March 1999

DOI:https://doi.org/10.1103/PhysRevC.60.024001